UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 8-K

CURRENT REPORT

PURSUANT TO SECTION 13 OR 15(d)

OF THE SECURITIES EXCHANGE ACT OF 1934

Date of Report (Date of earliest event reported): October 12, 2021

FS KKR Capital Corp.

(Exact name of Registrant as specified in its charter)

Registrant’s telephone number, including area code: (215) 495-1150

None

(Former name or former address, if changed since last report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

Securities registered pursuant to Section 12(b) of the Act:

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

On October 12, 2021, FS KKR Capital Corp. (the “Company”) and U.S. Bank National Association (the “Trustee”) entered into a Ninth Supplemental Indenture (the “Ninth Supplemental Indenture”) and a Tenth Supplemental Indenture (the “Tenth Supplemental Indenture”) to the Indenture, dated July 14, 2014, between the Company and the Trustee (the “Base Indenture”, and together with the Ninth Supplemental Indenture and the Tenth Supplemental Indenture, the “Indenture”). The Ninth Supplemental Indenture relates to the Company’s issuance of $500,000,000 aggregate principal amount of its 1.650% notes due 2024 (the “2024 Notes”). The Tenth Supplemental Indenture relates to the Company’s issuance of $750,000,000 aggregate principal amount of its 3.125% notes due 2028 (the “2028 Notes”, and together with the 2024 Notes, the “Notes”).

The 2024 Notes will mature on October 12, 2024 and the 2028 Notes will mature on October 12, 2028. The Notes may be redeemed in whole or in part at the Company’s option at any time or from time to time at the redemption prices set forth in the Indenture. The 2024 Notes bear interest at a rate of 1.650% per year, and the 2028 Notes bear interest at a rate of 3.125% per year, payable semi-annually on April 12th and October 12th of each year, commencing on April 12, 2022. The Notes are general unsecured obligations of the Company that rank senior in right of payment to all of the Company’s existing and future indebtedness that is expressly subordinated in right of payment to the Notes, rank pari passu with all existing and future unsecured unsubordinated indebtedness issued by the Company, rank effectively junior to any of the Company’s secured indebtedness (including unsecured indebtedness that the Company later secures) to the extent of the value of the assets securing such indebtedness, and rank structurally junior to all existing and future indebtedness (including trade payables) incurred by the Company’s subsidiaries, financing vehicles or similar facilities.

The Indenture contains certain covenants, including covenants requiring the Company to comply with the asset coverage requirements of Section 18(a)(1)(A) as modified by Section 61(a)(1) and (2) of the Investment Company Act of 1940, as amended, whether or not it is subject to those requirements, and to provide financial information to the holders of the Notes and the Trustee if the Company is no longer subject to the reporting requirements under the Securities Exchange Act of 1934, as amended. These covenants are subject to important limitations and exceptions that are described in the Indenture.

In addition, on the occurrence of a “change of control repurchase event,” as defined in the Indenture, the Company will generally be required to make an offer to purchase the outstanding Notes at a price equal to 100% of the principal amount of such Notes plus accrued and unpaid interest to the repurchase date.

The Notes were offered and sold in an offering registered under the Securities Act of 1933, as amended, pursuant to the Registration Statement on Form N-2 (File No. 333-260000) (the “Registration Statement”), the prospectus supplement dated October 4, 2021 and the pricing term sheet filed with the U.S. Securities and Exchange Commission on October 5, 2021. The transaction closed on October 12, 2021. The net proceeds to the Company were approximately $1,234,000,000, after deducting the underwriting discounts and commissions of approximately $12,500,000 payable by the Company and estimated offering expenses of approximately $600,000 payable by the Company. The Company intends to use the net proceeds for general corporate purposes, including to repay outstanding indebtedness under its financing arrangements.

The foregoing descriptions of the Ninth Supplemental Indenture, the Tenth Supplemental Indenture and the Notes do not purport to be complete and are qualified in their entirety by reference to the full text of the Ninth Supplemental Indenture, the Tenth Supplemental Indenture and the Notes, respectively, each filed as exhibits hereto and incorporated by reference herein.

The information required by Item 2.03 contained in Item 1.01 of this Current Report on Form 8-K is incorporated herein by reference.

On October 12, 2021, the Company issued a press release, a copy of which is attached hereto as Exhibit 99.1.

The information in this Item 7.01, including Exhibit 99.1 and the information set forth therein, is deemed to have been furnished to, and shall not be deemed to be “filed” with, the U.S. Securities and Exchange Commission.

(d) Exhibits

SIGNATURE

Pursuant to the requirements of the Securities Exchange Act of 1934, as amended, the Registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

Exhibit 4.1

EXECUTION VERSION

NINTH SUPPLEMENTAL INDENTURE

between

FS KKR CAPITAL CORP.

and

U.S. BANK NATIONAL ASSOCIATION,

as Trustee

Dated as of October 12, 2021

NINTH SUPPLEMENTAL INDENTURE

THIS NINTH SUPPLEMENTAL INDENTURE (this “Ninth Supplemental Indenture”), dated as of October 12, 2021, is between FS KKR Capital Corp., a Maryland corporation (the “Company”), and U.S. Bank National Association, as trustee (the “Trustee”). All capitalized terms used herein shall have the meaning set forth in the Base Indenture (as defined below) unless otherwise defined herein.

RECITALS OF THE COMPANY

The Company and the Trustee executed and delivered an Indenture, dated as of July 14, 2014 (the “Base Indenture”), as amended and supplemented by the First Supplemental Indenture, dated as of July 14, 2014, the Second Supplemental Indenture, dated as of December 3, 2014, the Third Supplemental Indenture, dated as of April 30, 2015, the Fourth Supplemental Indenture, dated as of July 15, 2019, the Fifth Supplemental Indenture, dated as of November 20, 2019, the Sixth Supplemental Indenture, dated as of April 30, 2020, the Seventh Supplemental Indenture, dated as of December 10, 2020, the Eighth Supplemental Indenture, dated as of June 17, 2021 and this Ninth Supplemental Indenture (the “Ninth Supplemental Indenture,” and together with the Base Indenture, the “Indenture”), to provide for the issuance by the Company from time to time of the Company’s unsecured debentures, notes or other evidences of indebtedness (the “Securities”), to be issued in one or more series as provided in the Base Indenture.

The Company desires to issue and sell $500,000,000 aggregate principal amount of the Company’s 1.650% Notes due 2024 (the “Notes”).

Sections 901(4) and 901(6) of the Base Indenture provide that without the consent of Holders of the Securities of any series issued under the Base Indenture (as supplemented or amended from time to time by one or more indentures supplemental thereto), the Company, when authorized by or pursuant to a Board Resolution, and the Trustee, at any time and from time to time, may enter into one or more indentures supplemental to the Base Indenture to (i) change or eliminate any of the provisions of the Base Indenture (as supplemented or amended from time to time by one or more indentures supplemental thereto) when there is no Security Outstanding of any series created prior to the execution of the supplemental indenture that is entitled to the benefit of such provision and (ii) establish the form or terms of Securities of any series as permitted by Section 201 and Section 301 of the Base Indenture.

The Company desires to establish the form and terms of the Notes and to modify, alter, supplement and change certain provisions of the Base Indenture for the benefit of the Holders of the Notes (subject to amendment as may be provided in a future supplemental indenture to the Indenture (“Future Supplemental Indenture”)).

The Company has duly authorized the execution and delivery of this Ninth Supplemental Indenture to provide for the issuance of the Notes and all acts and things necessary to make this Ninth Supplemental Indenture a valid, binding, and legal obligation of the Company and to constitute a valid agreement of the Company, in accordance with its terms, have been done and performed.

NOW, THEREFORE, for and in consideration of the premises and the purchase of the Notes by the Holders thereof, it is mutually agreed, for the equal and proportionate benefit of all Holders of the Notes, as follows:

ARTICLE I

TERMS OF THE NOTES

Section 1.01.    The following terms relating to the Notes are hereby established:

(a)    The Notes shall constitute a series of Senior Securities having the title “1.650% Notes due 2024”. The Notes shall bear a CUSIP number of 302635 AJ6 and an ISIN number of US302635AJ69.

(b)    The aggregate principal amount of the Notes that may be initially authenticated and delivered under the Indenture (except for Notes authenticated and delivered upon registration of, transfer of, or in exchange for, or in lieu of, other Notes pursuant to Sections 304, 305, 306, 906, 1107 or 1305 of the Base Indenture, and except for any Securities that, pursuant to Section 303 of the Base Indenture, are deemed never to have been authenticated and delivered under the Indenture) shall be $500,000,000. Under a Board Resolution, Officers’ Certificate pursuant to Board Resolutions or an indenture supplement, the Company may from time to time, without the consent of the Holders of Notes, issue additional Notes (in any such case “Additional Notes”) having the same ranking and the same interest rate, maturity and other terms as the Notes; provided that, if such Additional Notes are not fungible with the Notes (or any other tranche of Additional Notes) for U.S. federal income tax purposes, then such Additional Notes will have different CUSIP numbers from the Notes (and any such other tranche of Additional Notes). Any Additional Notes and the existing Notes will constitute a single series under the Indenture and all references to the relevant Notes herein shall include the Additional Notes unless the context otherwise requires.

(c)    The entire outstanding principal of the Notes shall be payable on October 12, 2024, unless earlier redeemed or repurchased in accordance with the provisions of this Ninth Supplemental Indenture.

(d)    The rate at which the Notes shall bear interest shall be 1.650% per annum (the “Applicable Interest Rate”). The date from which interest shall accrue on the Notes shall be October 12, 2021, or the most recent Interest Payment Date to which interest has been paid or provided for; the Interest Payment Dates for the Notes shall be April 12 and October 12 of each year, commencing April 12, 2022 (if an Interest Payment Date falls on a day that is not a Business Day, then the applicable interest payment will be made on the next succeeding Business Day and no additional interest will accrue as a result of such delayed payment); the initial interest period will be the period from and including October 12, 2021 (or the most recent Interest Payment Date to which interest has been paid or provided for), to, but excluding, the initial Interest Payment Date, and the subsequent interest periods will be the periods from and including an Interest Payment Date to, but excluding, the next Interest Payment Date or the Stated Maturity, as the case may be. Interest so payable, and punctually paid or duly provided for, on any Interest Payment Date, will be paid to the Person in whose name the Note (or one or more Predecessor Securities) is registered at 5:00 p.m. New York City time, or the close of business, on the Regular Record Date for such interest, which shall be April 1 and October 1 (whether or not a Business Day), as the case may be, next preceding such Interest Payment Date. Payment of principal of (and premium, if any, on) and any such interest on the Notes will be made at the office of the Trustee located at One Federal Street, 10th Floor, Boston, MA 02110 and at such other address as designated by the Trustee, in such coin or currency of the United States of America as at the time of payment is legal tender for payment of public and private debts; provided, however, that at the option of the Company, payment of interest may be made by check mailed to the address of the Person entitled thereto as such address shall appear in the Security Register. Interest on the Notes will be computed on the basis of a 360-day year of twelve 30-day months.

(e)    The Notes shall be initially issuable in global form (each such Note, a “Global Note”). The Global Notes and the Trustee’s certificate of authentication thereon shall be substantially in the form of Exhibit A to this Ninth Supplemental Indenture. Each Global Note shall represent the outstanding Notes as shall be specified therein and each shall provide that it shall represent the aggregate amount of outstanding Notes from time to time endorsed thereon and that the aggregate amount of outstanding Notes represented thereby may from time to time be

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reduced or increased, as appropriate, to reflect exchanges and redemptions. Any endorsement of a Global Note to reflect the amount of any increase or decrease in the amount of outstanding Notes represented thereby shall be made by the Trustee or the Security Registrar, in accordance with Sections 203 and 305 of the Base Indenture.

(f)    The depositary for such Global Notes (the “Depositary”) shall be The Depository Trust Company, New York, New York, until a successor shall have been appointed and becomes such person, and thereafter, Depositary shall mean or include such successor. The Security Registrar with respect to the Global Notes shall be the Trustee.

(g)    The Notes shall be defeasible pursuant to Section 1402 or Section 1403 of the Base Indenture. Covenant defeasance contained in Section 1403 of the Base Indenture shall apply to the covenants contained in Sections 1007 and 1008 of the Indenture.

(h)    The Notes shall be redeemable pursuant to Section 1101 of the Base Indenture and, in whole or in part, at any time, or from time to time, at the option of the Company, at a Redemption Price equal to the greater of the following amounts, plus, in each case, accrued and unpaid interest, if any, to, but excluding, the Redemption Date:

(i)    100% of the principal amount of the Notes to be redeemed, or

(ii)    the sum of the present values of the remaining scheduled payments of principal and interest (exclusive of accrued and unpaid interest to the Redemption Date) on the Notes to be redeemed through the maturity date, discounted to the Redemption Date on a semi-annual basis (assuming a 360-day year consisting of twelve 30-day months) using the applicable Treasury Rate plus 20 basis points.

For purposes of calculating the Redemption Price in connection with the redemption of the Notes, on any Redemption Date, the following terms have the meanings set forth below:

“Comparable Treasury Issue” means the United States Treasury security selected by the Reference Treasury Dealer as having a maturity comparable to the remaining term of the Notes to be redeemed that would be utilized, at the time of selection and in accordance with customary financing practice, in pricing new issues of corporate debt securities of comparable maturity to the remaining term of the Notes being redeemed.

“Comparable Treasury Price” means (1) the average of the remaining Reference Treasury Dealer Quotations for the Redemption Date, after excluding the highest and lowest Reference Treasury Dealer Quotations, or (2) if the Quotation Agent obtains fewer than four such Reference Treasury Dealer Quotations, the average of all such quotations.

“Quotation Agent” means a Reference Treasury Dealer selected by the Company.

“Reference Treasury Dealer” means, with respect to the Notes, each of (i) BofA Securities, Inc., (ii) BMO Capital Markets Corp., (iii) a primary U.S. government securities dealer selected by MUFG Securities Americas Inc., (iv) a primary U.S. government securities dealer selected by Truist Securities, Inc. and (v) a primary U.S. government securities dealer selected by KKR Capital Markets LLC, or their respective affiliates which are primary U.S. government securities dealers and their respective successors; provided, however, that if any of the foregoing or their affiliates shall cease to be a primary U.S. government securities dealer in the United States, or a Primary Treasury Dealer, the Company shall select another Primary Treasury Dealer.

“Reference Treasury Dealer Quotations” means, with respect to each Reference Treasury Dealer and any Redemption Date, the average, as determined by the Quotation Agent, of the bid and asked prices for the Comparable Treasury Issue (expressed in each case as a percentage of its principal amount) quoted in writing to the Quotation Agent by such Reference Treasury Dealer at 3:30 p.m. New York City time on the third Business Day preceding such Redemption Date.

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“Treasury Rate” means, with respect to any Redemption Date, the rate per annum equal to the semi-annual equivalent yield-to-maturity of the Comparable Treasury Issue (computed as of the third Business Day immediately preceding the redemption), assuming a price for the Comparable Treasury Issue (expressed as a percentage of its principal amount) equal to the Comparable Treasury Price for such Redemption Date. The Redemption Price and the Treasury Rate will be determined by the Company.

All determinations made by any Reference Treasury Dealer, including the Quotation Agent, with respect to determining the Redemption Price will be final and binding absent manifest error.

(i)    Notice of redemption shall be given in writing and mailed, first-class postage prepaid or by overnight courier guaranteeing next-day delivery, to each Holder of the Notes to be redeemed, not less than thirty (30) nor more than sixty (60) days prior to the Redemption Date, at the Holder’s address appearing in the Security Register. All notices of redemption shall contain the information set forth in Section 1104 of the Base Indenture.

(ii)    Any exercise of the Company’s option to redeem the Notes will be done in compliance with the Investment Company Act, to the extent applicable.

(iii)    If the Company elects to redeem only a portion of the Notes, the particular Notes to be redeemed will be selected in accordance with the applicable procedures of the Trustee and, so long as the Notes are registered to the Depositary or its nominee, the Depositary; provided, however, that no such partial redemption shall reduce the portion of the principal amount of a Note not redeemed to less than $2,000.

(iv)    Unless the Company defaults in payment of the Redemption Price, on and after the Redemption Date, interest will cease to accrue on the Notes called for redemption hereunder.

(i)    The Notes shall not be subject to any sinking fund pursuant to Section 1201 of the Base Indenture.

(j)    The Notes shall be issuable in denominations of $2,000 and integral multiples of $1,000 in excess thereof.

(k)    Holders of the Notes will not have the option to have the Notes repaid prior to the Stated Maturity other than in accordance with Article Thirteen of the Indenture.

ARTICLE II

DEFINITIONS AND OTHER PROVISIONS OF GENERAL APPLICATION

Section 2.01.    Except as may be provided in a Future Supplemental Indenture, for the benefit of the Holders of the Notes but no other series of Securities under the Base Indenture (as supplemented or amended from time to time by one or more indentures supplemental thereto), whether now or hereafter issued and Outstanding, Article One of the Base Indenture shall be amended by adding the following defined terms to Section 101 in appropriate alphabetical sequence, as follows:

“Below Investment Grade Rating Event” means the Notes are downgraded below Investment Grade by both Rating Agencies on any date from the date of the public notice of an arrangement that results in a Change of Control until the end of the 60-day period following public notice of the occurrence of a Change of Control (which period shall be extended so long as the rating of the Notes is under publicly announced consideration for possible downgrade by either of the Rating Agencies); provided that a Below Investment Grade Rating Event otherwise arising by virtue of a particular reduction in rating shall not be deemed to have occurred in respect of a particular Change of Control (and thus shall not be deemed a Below Investment Grade Rating Event for purposes of the definition of Change of Control Repurchase Event hereunder) if the Rating Agencies making the reduction in rating to which this definition would otherwise apply do not announce or publicly confirm or inform the Trustee in writing at its request that the reduction was the result, in whole or in part, of any event or circumstance comprised of or arising as a result of, or in respect of, the applicable Change of Control (whether or not the applicable Change of Control shall have occurred at the time of the Below Investment Grade Rating Event).

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“Change of Control” means the occurrence of any of the following:

(1) the direct or indirect sale, lease, transfer, conveyance or other disposition (other than by way of merger or consolidation) in one or a series of related transactions, of all or substantially all of the assets of the Company and its Controlled Subsidiaries taken as a whole to any “person” or “group” (as those terms are used in Section 13(d)(3) of the Exchange Act), other than to any Permitted Holders; provided that, for the avoidance of doubt, a pledge of assets pursuant to any secured debt instrument of the Company or its Controlled Subsidiaries shall not be deemed to be any such sale, lease, transfer, conveyance or disposition;

(2) the consummation of any transaction (including, without limitation, any merger or consolidation) the result of which is that any “person” or “group” (as those terms are used in Section 13(d)(3) of the Exchange Act) (other than any Permitted Holders) becomes the “beneficial owner” (as defined in Rules 13d-3 and 13d-5 promulgated under the Exchange Act), directly or indirectly, of more than 50% of the outstanding Voting Stock of the Company, measured by voting power rather than number of shares; or

(3) the approval by the Company’s stockholders of any plan or proposal relating to the liquidation or dissolution of the Company.

“Change of Control Repurchase Event” means the occurrence of a Change of Control and a Below Investment Grade Rating Event.

“Controlled Subsidiary” means any Subsidiary of the Company, 50% or more of the outstanding equity interests of which are owned by the Company and its direct or indirect Subsidiaries and of which the Company possesses, directly or indirectly, the power to direct or cause the direction of the management or policies, whether through the ownership of voting equity interests, by agreement or otherwise.

“Fitch” means Fitch Ratings, Inc., also known as Fitch Ratings, or any successor thereto.

“GAAP” means generally accepted accounting principles in the United States set forth in the opinions and pronouncements of the Accounting Principles Board of the American Institute of Certified Public Accountants, the opinions and pronouncements of the Public Company Accounting Oversight Board and the statements and pronouncements of the Financial Accounting Standards Board or in such other statements by such other entity as have been approved by a significant segment of the accounting profession in the United States, which are in effect from time to time.

“Investment Company Act” means the Investment Company Act of 1940, as amended, and the rules, regulations and interpretations promulgated thereunder, to the extent applicable, and any statute successor thereto.

“Investment Grade” means a rating of BBB- or better by Fitch (or its equivalent under any successor rating categories of Fitch) and Baa3 or better by Moody’s (or its equivalent under any successor rating categories of Moody’s) (or, in each case, if such Rating Agency ceases to rate the Notes for reasons outside of the Company’s control, the equivalent investment grade credit rating from any Rating Agency selected by the Company as a replacement Rating Agency).

“Moody’s” means Moody’s Investors Service or any successor thereto.

“Permitted Holders” means (i) the Company, (ii) one or more of the Company’s Controlled Subsidiaries and (iii) FS/KKR Advisor, LLC, any Affiliate of FS KKR Advisor, LLC or any entity that is managed by FS/KKR Advisor, LLC that is organized under the laws of a jurisdiction located in the United States of America and in the business of managing or advising clients.

“Rating Agency” means (1) each of Fitch and Moody’s; and (2) if either Fitch or Moody’s ceases to rate the Notes or fails to make a rating of the Notes publicly available for reasons outside of the Company’s control, a “nationally recognized statistical rating organization” as defined in Section 3(a)(62) of the Exchange Act selected by the Company as a replacement agency for Fitch or Moody’s, or both, as the case may be.

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“Significant Subsidiary” means any Subsidiary that would be a “significant subsidiary” as defined in Article 1, Rule 1-02 of Regulation S-X under the Exchange Act, as such regulation is in effect on the date of this Indenture (but excluding any Subsidiary which is (a) a non-recourse or limited recourse Subsidiary, (b) a bankruptcy remote special purpose vehicle or (c) is not consolidated with the Company for purposes of GAAP).

“Voting Stock” as applied to stock of any Person, means shares, interests, participations or other equivalents in the equity interest (however designated) in such Person having ordinary voting power for the election of a majority of the directors (or the equivalent) of such Person, other than shares, interests, participations or other equivalents having such power only by reason of the occurrence of a contingency.

Section 2.02.    Except as may be provided in a Future Supplemental Indenture, for the benefit of the Holders of the Notes but no other series of Securities under the Base Indenture (as supplemented or amended from time to time by one or more indentures supplemental thereto), whether now or hereafter issued and Outstanding, Article One of the Base Indenture shall be amended by amending and restating the definitions of “Business Day” and “Subsidiary” in Section 101 as follows:

“Business Day” means, with respect to any Note, any day other than a Saturday, Sunday or a day on which banking institutions in New York are authorized or obligated by law or executive order to close.

“Subsidiary” means (1) any corporation a majority of the outstanding voting stock of which is owned, directly or indirectly, by the Company or by one or more other Subsidiaries of the Company, (2) any other Person (other than a corporation) in which such Person, one or more Subsidiaries of such Person, or such Person and one or more Subsidiaries of such Person, directly or indirectly, at the date of determination thereof has a majority ownership interest, or (3) a partnership in which such Person or Subsidiary of such Person is, at the time, a general partner and in which such Person, directly or indirectly, at the date of determination thereof has a majority ownership interest. For the purposes of this definition, “voting stock” mean stock having voting power for the election of directors, whether at all times or only so long as no senior class of stock has such voting power by reason of any contingency. In addition, for purposes of this definition, “Subsidiary” shall exclude any investments held by the Company in the ordinary course of business which are not, under GAAP, consolidated on the financial statements of the Company and its Subsidiaries.

ARTICLE III

SECURITIES FORMS

Section 3.01.    Except as may be provided in a Future Supplemental Indenture, for the benefit of the Holders of the Notes but no other series of Securities under the Base Indenture (as supplemented or amended from time to time by one or more indentures supplemental thereto), whether now or hereafter issued and Outstanding, Article Two of the Base Indenture shall be amended by adding the following new Section 204 thereto, as set forth below:

“Section 204.    Certificated Notes.

Notwithstanding anything to the contrary in the Indenture, Notes in physical, certificated form will be issued and delivered to each person that the Depositary identifies as a beneficial owner of the related Notes only if:

(a)    the Depositary notifies the Company at any time that it is unwilling or unable to continue as depositary for the Notes in global form and a successor depositary is not appointed within 90 days;

(b)    the Depositary ceases to be registered as a clearing agency under the Exchange Act and a successor depositary is not appointed within 90 days; or

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(c)    an Event of Default with respect to the Notes has occurred and is continuing and such beneficial owner requests that its Notes be issued in physical, certificated form.”

ARTICLE IV

REMEDIES

Section 4.01.    Except as may be provided in a Future Supplemental Indenture, for the benefit of the Holders of the Notes but no other series of Securities under the Base Indenture (as supplemented or amended from time to time by one or more indentures supplemental thereto), whether now or hereafter issued and Outstanding, Article Five of the Base Indenture shall be amended by replacing clause (2) of Section 501 thereof with the following:

“(2)     default in the payment of the principal of (or premium, if any, on) any Note when it becomes due and payable at its Maturity including upon any Redemption Date or required repurchase date; or”

Section 4.02.    Except as may be provided in a Future Supplemental Indenture, for the benefit of the Holders of the Notes but no other series of Securities under the Base Indenture (as supplemented or amended from time to time by one or more indentures supplemental thereto), whether now or hereafter issued and Outstanding, Section 501 of the Base Indenture shall be amended by replacing clause (4) thereof with the following:

Section 4.03.    Except as may be provided in a Future Supplemental Indenture, for the benefit of the Holders of the Notes but no other series of Securities under the Base Indenture (as supplemented or amended from time to time by one or more indentures supplemental thereto), whether now or hereafter issued and Outstanding, Article Five of the Base Indenture shall be amended by adding as clause (9) of Section 501 thereof the following:

Section 4.04.    Except as may be provided in a Future Supplemental Indenture, for the benefit of Holders of the Notes but no other series of Securities under the Base Indenture (as supplemented or amended from time to time by one or more indentures supplemental thereto), whether now or hereafter issued and Outstanding, Section 501 of the Base Indenture shall be amended by replacing clause (7) thereof with the following:

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Section 4.05.    Except as may be provided in a Future Supplemental Indenture, for the benefit of Holders of the Notes but no other series of Securities under the Base Indenture (as supplemented or amended from time to time by one or more indentures supplemental thereto), whether now or hereafter issued and Outstanding, Article Five of the Base Indenture shall be amended by amending clause (6) of Section 501 thereof as follows: the words “90 consecutive days” in the final clause thereof shall be replaced with the words “60 consecutive days”.

Section 4.06.    Except as may be provided in a Future Supplemental Indenture, for the benefit of the Holders of the Notes but no other series of Securities under the Base Indenture (as supplemented or amended from time to time by one or more indentures supplemental thereto), whether now or hereafter issued and Outstanding, Article Five of the Base Indenture shall be amended by replacing the first paragraph of Section 502 thereof with the following:

“If an Event of Default with respect to the Notes occurs and is continuing, then and in every such case (other than an Event of Default specified in Section 501(5) or 501(6)), the Trustee or the Holders of not less than 25% in principal amount of the Outstanding Notes may (and the Trustee shall at the request of such Holders) declare the principal of all the Outstanding Notes to be due and payable immediately, by a notice in writing to the Company (and to the Trustee if given by the Holders), and upon any such declaration such principal or specified portion thereof shall become immediately due and payable; provided that 100% of the principal of, and accrued and unpaid interest on, the Notes will automatically become due and payable in the case of an Event of Default specified in Section 501(5) or 501(6) hereof.”

Section 4.07.    Except as may be provided in a Future Supplemental Indenture, for the benefit of Holders of the Notes but no other series of Securities under the Base Indenture (as supplemented or amended from time to time by one or more indentures supplemental thereto), whether now or hereafter issued and Outstanding, Article Five of the Base Indenture shall be amended by replacing clause (3) of Section 512 thereof with the following:

ARTICLE V

THE TRUSTEE

Section 5.01.    Except as may be provided in a Future Supplemental Indenture, for the benefit of Holders of the Notes but no other series of Securities under the Base Indenture (as supplemented or amended from time to time by one or more indentures supplemental thereto), whether now of hereafter issued and Outstanding, Article Six of the Base Indenture shall be amended by replacing the final proviso of Section 601 thereof with the following:

“and provided further that in the case of any Default or breach of the character specified in Section 501(4) with respect to the Securities of such series, no such notice to Holders shall be given until at least 60 days after the occurrence thereof”

ARTICLE VI

COVENANTS

Section 6.01.    Except as may be provided in a Future Supplemental Indenture, for the benefit of Holders of the Notes but no other series of Securities under the Base Indenture (as supplemented or amended from time to time by one or more indentures supplemental thereto), whether now or hereafter issued and Outstanding, Article Ten of the Base Indenture shall be amended by replacing clause (1) of Section 1005 thereof with the following:

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Section 6.02.    Except as may be provided in a Future Supplemental Indenture, for the benefit of the Holders of the Notes but no other series of Securities under the Base Indenture (as supplemented or amended from time to time by one or more indentures supplemental thereto), whether now or hereafter issued and Outstanding, Article Ten of the Base Indenture shall be amended by adding the following new Sections 1007 and 1008 thereto, each as set forth below:

“Section 1007    Section 18(a)(1)(A) of the Investment Company Act.

The Company hereby agrees that for the period of time during which the Notes are Outstanding, the Company will not violate, whether or not it is subject to, Section 18(a)(1)(A) of the Investment Company Act as modified by Section 61(a)(1) and (2) of the Investment Company Act or any successor provisions, as such obligations may be amended or superseded, giving effect to any exemptive relief granted to the Company by the Securities and Exchange Commission.”

“Section 1008    Commission Reports and Reports to Holders.

If, at any time, the Company is not subject to the reporting requirements of Sections 13 or 15(d) of the Exchange Act to file any periodic reports with the Commission, the Company agrees to furnish to the Holders of the Notes and the Trustee for the period of time during which the Notes are Outstanding: (i) within 90 days after the end of each fiscal year of the Company, audited annual consolidated financial statements of the Company and (ii) within 45 days after the end of each fiscal quarter of the Company (other than the Company’s fourth fiscal quarter), unaudited interim consolidated financial statements of the Company. All such financial statements shall be prepared, in all material respects, in accordance with GAAP, as applicable.”

ARTICLE VII

CONSOLIDATION, MERGER, CONVEYANCE OR TRANSFER

Except as may be provided in a Future Supplemental Indenture, for the benefit of the Holders of the Notes but no other series of Securities under the Base Indenture (as supplemented or amended from time to time by one or more indentures supplemental thereto), whether now or hereafter issued and Outstanding, Article Eight of the Base Indenture shall be amended by replacing Section 801 with the following:

“Section 801    Merger, Consolidation or Sale of Assets.

The Company shall not merge or consolidate with or into any other Person (other than a merger of a wholly owned Subsidiary of the Company into the Company), or sell, transfer, lease, convey or otherwise dispose of all or substantially all of its property (provided that, for the avoidance of doubt, a pledge of assets pursuant to any secured debt instrument of the Company or its Controlled Subsidiaries shall not be deemed to be any such sale, transfer, lease, conveyance or disposition) in any one transaction or series of related transactions unless:

(1) the Company shall be the surviving Person (the “Surviving Person”) or the Surviving Person (if other than the Company) formed by such merger or consolidation or to which such sale, transfer, lease, conveyance or disposition is made shall be a corporation or limited liability company organized and existing under the laws of the United States of America or any state or territory thereof;

(2) the Surviving Person (if other than the Company) expressly assumes, by supplemental indenture in form reasonably satisfactory to the Trustee, executed and delivered to the Trustee by such Surviving Person, the due and punctual payment of the principal of, and premium, if any, and interest on, all the Notes Outstanding, and the due and punctual performance and observance of all the covenants and conditions of this Indenture to be performed by the Company;

- 9 -

(3) immediately before and immediately after giving effect to such transaction or series of related transactions, no Default or Event of Default shall have occurred and be continuing; and

(4) the Company shall deliver, or cause to be delivered, to the Trustee, an Officers’ Certificate and an Opinion of Counsel, each stating that such transaction and the supplemental indenture, if any, in respect thereto, comply with this Section 801 and that all conditions precedent in this Indenture relating to such transaction have been complied with.

For the purposes of this Section 801, the sale, transfer, lease, conveyance or other disposition of all the property of one or more Subsidiaries of the Company, which property, if held by the Company instead of such Subsidiaries, would constitute all or substantially all the property of the Company on a consolidated basis, shall be deemed to be the transfer of all or substantially all the property of the Company.”

ARTICLE VIII

OFFER TO REPURCHASE UPON A CHANGE OF CONTROL REPURCHASE EVENT

Except as may be provided in a Future Supplemental Indenture, for the benefit of the Holders of the Notes but no other series of Securities under the Base Indenture (as supplemented or amended from time to time by one or more indentures supplemental thereto), whether now or hereafter issued and Outstanding, Article Thirteen of the Base Indenture shall be amended by replacing Sections 1301 to 1305 with the following:

“Section 1301 Change of Control.

If a Change of Control Repurchase Event occurs, unless the Company shall have exercised its right to redeem the Notes in full, the Company shall make an offer to each Holder of the Notes to repurchase all or any part (in minimum denominations of $2,000 and integral multiples of $1,000 principal amount in excess thereof) of that Holder’s Notes at a repurchase price in cash equal to 100% of the aggregate principal amount of Notes repurchased plus any accrued and unpaid interest on the Notes repurchased to, but not including, the date of purchase. Within 30 days following any Change of Control Repurchase Event or, at the Company’s option, prior to any Change of Control, but after the public announcement of the Change of Control, the Company shall mail a notice to each Holder describing the transaction or transactions that constitute or may constitute the Change of Control Repurchase Event and offering to repurchase Notes on the payment date specified in the notice, which date will be no earlier than 30 days and no later than 60 days from the date such notice is mailed. The notice shall, if mailed prior to the date of consummation of the Change of Control, state that the offer to purchase is conditioned on the Change of Control Repurchase Event occurring on or prior to the payment date specified in the notice. The Company shall comply with the requirements of Rule 14e-1 promulgated under the Exchange Act and any other securities laws and regulations thereunder to the extent those laws and regulations are applicable in connection with the repurchase of the Notes as a result of a Change of Control Repurchase Event.

To the extent that the provisions of any securities laws or regulations conflict with this Section 1301, the Company shall comply with the applicable securities laws and regulations and shall not be deemed to have breached its obligations under this Section 1301 by virtue of such conflict.

On the Change of Control Repurchase Event payment date, subject to extension if necessary to comply with the provisions of the Investment Company Act, the Company shall, to the extent lawful:

(1) accept for payment all Notes or portions of Notes properly tendered pursuant to its offer;

(2) deposit with the Paying Agent an amount equal to the aggregate purchase price in respect of all Notes or portions of Notes properly tendered; and

- 10 -

(3) deliver or cause to be delivered to the Trustee the Notes properly accepted, together with an Officers’ Certificate stating the aggregate principal amount of Notes being purchased by the Company.

The Paying Agent will promptly remit to each Holder of Notes properly tendered the purchase price for the Notes, and the Trustee will promptly authenticate and mail (or cause to be transferred by book-entry) to each Holder a new Note equal in principal amount to any unpurchased portion of any Notes surrendered; provided that each new Note will be in a minimum principal amount of $2,000 or an integral multiple of $1,000 in excess thereof.

If any Repayment Date upon a Change of Control Repurchase Event falls on a day that is not a Business Day, then the required payment will be made on the next succeeding Business Day and no additional interest will accrue as a result of such delayed payment.

The Company will not be required to make an offer to repurchase the Notes upon a Change of Control Repurchase Event if a third party makes an offer in respect of the Notes in the manner, at the time and otherwise in compliance with the requirements for an offer made by the Company and such third party purchases all Notes properly tendered and not withdrawn under its offer.”

ARTICLE IX

MISCELLANEOUS

Section 9.01.    This Ninth Supplemental Indenture and the Notes shall be governed by and construed in accordance with the laws of the State of New York, without regard to principles of conflicts of laws that would cause the application of laws of another jurisdiction. This Ninth Supplemental Indenture is subject to the provisions of the Trust Indenture Act that are required to be part of the Indenture and shall, to the extent applicable, be governed by such provisions.

Section 9.02.    In case any provision in this Ninth Supplemental Indenture or in the Notes shall be invalid, illegal or unenforceable, the validity, legality and enforceability of the remaining provisions shall not in any way be affected or impaired thereby.

Section 9.03.    This Ninth Supplemental Indenture may be executed in counterparts, each of which will be an original, but such counterparts will together constitute but one and the same Ninth Supplemental Indenture. The exchange of copies of this Ninth Supplemental Indenture and of signature pages by facsimile, .pdf transmission, email or other electronic means shall constitute effective execution and delivery of this Ninth Supplemental Indenture for all purposes. Signatures of the parties hereto transmitted by facsimile, .pdf transmission, email or other electronic means shall be deemed to be their original signatures for all purposes. For the avoidance of doubt, all notices, approvals, consents, requests and any communications hereunder or with respect to the Notes must be in writing (provided that any communication sent to the Trustee hereunder must be in the form of a document that is signed manually or by way of a digital signature provided by DocuSign or Adobe (or such other digital signature provider as specified in writing to the Trustee by the authorized representative), in English. The Company agrees to assume all risks arising out of the use of using digital signatures and electronic methods to submit communications to the Trustee, including without limitation the risk of the Trustee acting on unauthorized instructions, and the risk of interception and misuse by third parties.

Section 9.04.    The Base Indenture, as supplemented and amended by this Ninth Supplemental Indenture, is in all respects ratified and confirmed, and the Base Indenture and this Ninth Supplemental Indenture shall be read, taken and construed as one and the same instrument with respect to the Notes. All provisions included in this Ninth Supplemental Indenture supersede any conflicting provisions included in the Base Indenture with respect to the Notes, unless not permitted by law. The Trustee accepts the trusts created by the Base Indenture, as supplemented by this Ninth Supplemental Indenture, and agrees to perform the same upon the terms and conditions of the Base Indenture, as supplemented by this Ninth Supplemental Indenture.

- 11 -

Section 9.05.    The provisions of this Ninth Supplemental Indenture shall become effective as of the date hereof.

Section 9.06.    Notwithstanding anything else to the contrary herein, the terms and provisions of this Ninth Supplemental Indenture shall apply only to the Notes and shall not apply to any other series of Securities under the Base Indenture (as supplemented or amended from time to time by one or more indentures supplemental thereto) and this Ninth Supplemental Indenture shall not and does not otherwise affect, modify, alter, supplement or change the terms and provisions of any other series of Securities under the Base Indenture (as supplemented or amended from time to time by one or more indentures supplemental thereto), whether now or hereafter issued and Outstanding.

Section 9.07.    The recitals contained herein and in the Notes shall be taken as the statements of the Company, and the Trustee assumes no responsibility for their correctness. The Trustee makes no representations as to the validity or sufficiency of this Ninth Supplemental Indenture, the Notes or any Additional Notes, except that the Trustee represents that it is duly authorized to execute and deliver this Ninth Supplemental Indenture, authenticate the Notes and any Additional Notes and perform its obligations hereunder. The Trustee shall not be accountable for the use or application by the Company of the Notes or any Additional Notes or the proceeds thereof.

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IN WITNESS WHEREOF, the parties hereto have caused this Ninth Supplemental Indenture to be duly executed as of the date first above written.

[Signature page to Ninth Supplemental Indenture]

Exhibit A – Form of Global Note

This Security is a Global Note within the meaning of the Indenture hereinafter referred to and is registered in the name of The Depository Trust Company or a nominee thereof. This Security may not be exchanged in whole or in part for a Security registered, and no transfer of this Security in whole or in part may be registered, in the name of any Person other than The Depository Trust Company or a nominee thereof, except in the limited circumstances described in the Indenture.

Unless this certificate is presented by an authorized representative of The Depository Trust Company to the issuer or its agent for registration of transfer, exchange or payment and such certificate issued in exchange for this certificate is registered in the name of Cede & Co., or such other name as requested by an authorized representative of The Depository Trust Company, any transfer, pledge or other use hereof for value or otherwise by or to any person is wrongful, as the registered owner hereof, Cede & Co., has an interest herein.

FS KKR Capital Corp.

1.650% Notes due 2024

FS KKR Capital Corp., a corporation duly organized and existing under the laws of Maryland (herein called the “Company”, which term includes any successor Person under the Indenture hereinafter referred to), for value received, hereby promises to pay to Cede & Co., or registered assigns, the principal sum of                      (U.S. $        ) on October 12, 2024, and to pay interest thereon from October 12, 2021 or from the most recent Interest Payment Date to which interest has been paid or duly provided for, semi-annually on April 12 and October 12 of each year, commencing April 12, 2022, at the rate of 1.650% per annum until the principal hereof is paid or made available for payment. The interest so payable, and punctually paid or duly provided for, on any Interest Payment Date will, as provided in such Indenture, be paid to the Person in whose name this Security is registered at the close of business on the Regular Record Date for such interest, which shall be April 1 and October 1 (whether or not a Business Day), as the case may be, next preceding such Interest Payment Date. Any such interest not so punctually paid or duly provided for will forthwith cease to be payable to the Holder on such Regular Record Date and may either be paid to the Person in whose name this Security is registered at the close of business on a Special Record Date for the payment of such Defaulted Interest to be fixed by the Trustee, notice whereof shall be given to Holders of Securities of this series not less than 10 days prior to such Special Record Date, or be paid at any time in any other lawful manner not inconsistent with the requirements of any securities exchange on which the Securities of this series may be listed, and upon such notice as may be required by such exchange, all as more fully provided in said Indenture. This Security may be issued as part of a series.

Payment of the principal of (and premium, if any, on) and any such interest on this Security will be made at the office of the Trustee located at One Federal Street, 10th Floor, Boston, MA 02110 and at such other address as designated by the Trustee, in such coin or currency of the United States of America as at the time of payment is legal tender for payment of public and private debts; provided, however, that at the option of the Company payment of interest may be made by check mailed to the address of the Person entitled thereto as such address shall appear in the Security Register; provided, further, however, that so long as this Security is registered to Cede & Co., such payment will be made by wire transfer in accordance with the procedures established by The Depository Trust Company and the Trustee.

Reference is hereby made to the further provisions of this Security set forth on the reverse hereof, which further provisions shall for all purposes have the same effect as if set forth at this place.

Unless the certificate of authentication hereon has been executed by the Trustee referred to on the reverse hereof by manual signature, this Security shall not be entitled to any benefit under the Indenture or be valid or obligatory for any purpose.

A-1

IN WITNESS WHEREOF, the Company has caused this instrument to be duly executed.

Dated: October 12, 2021

A-2

This is one of the Securities of the series designated therein referred to in the within-mentioned Indenture.

Dated: October 12, 2021

A-3

FS KKR Capital Corp.

1.650% Notes due 2024

This Security is one of a duly authorized issue of Senior Securities of the Company (herein called the “Securities”), issued and to be issued in one or more series under an Indenture, dated as of July 14, 2014 (herein called the “Base Indenture”, which term shall have the meaning assigned to it in such instrument), between the Company and U.S. Bank National Association, as Trustee (herein called the “Trustee”, which term includes any successor trustee under the Base Indenture), and reference is hereby made to the Base Indenture for a statement of the respective rights, limitations of rights, duties and immunities thereunder of the Company, the Trustee, and the Holders of the Securities and of the terms upon which the Securities are, and are to be, authenticated and delivered, as amended and supplemented by the First Supplemental Indenture, dated as of July 14, 2014, the Second Supplemental Indenture, dated as of December 3, 2014, the Third Supplemental Indenture, dated as of April 30, 2015, the Fourth Supplemental Indenture, dated as of July 15, 2019, the Fifth Supplemental Indenture, dated as of November 20, 2019, the Sixth Supplemental Indenture, dated as of April 30, 2020, the Seventh Supplemental Indenture, dated as of December 10, 2020, the Eighth Supplemental Indenture, dated as of June 17, 2021 and this Ninth Supplemental Indenture, relating to the Securities, dated as of October 12, 2021, by and between the Company and the Trustee (herein called the “Ninth Supplemental Indenture”; and the Ninth Supplemental Indenture and the Base Indenture collectively are herein called the “Indenture”). In the event of any conflict between the Base Indenture and the Ninth Supplemental Indenture, the Ninth Supplemental Indenture shall govern and control.

This Security is one of the series designated on the face hereof, initially limited in aggregate principal amount to $        . Under a Board Resolution, Officers’ Certificate pursuant to Board Resolutions or an indenture supplement, the Company may from time to time, without the consent of the Holders of Securities, issue additional Securities of this series (in any such case “Additional Securities”) having the same ranking and the same interest rate, maturity and other terms as the Securities, provided that, if such Additional Securities are not fungible with the Securities (or any other tranche of Additional Securities) for U.S. federal income tax purposes, then such Additional Securities will have different CUSIP numbers from the Securities represented hereby (and any such other tranche of Additional Securities). Any Additional Securities and the existing Securities will constitute a single series under the Indenture and all references to the relevant Securities herein shall include the Additional Securities unless the context otherwise requires. The aggregate amount of outstanding Securities represented hereby may from time to time be reduced or increased, as appropriate, to reflect exchanges and redemptions.

The Securities of this series are subject to redemption in whole or in part at any time or from time to time, at the option of the Company, at a Redemption Price per security equal to the greater of the following amounts, plus, in each case, accrued and unpaid interest, if any, to, but excluding, the Redemption Date:

For purposes of calculating the Redemption Price in connection with the redemption of the Notes, on any Redemption Date, the following terms have the meanings set forth below:

“Comparable Treasury Issue” means the United States Treasury security selected by the Reference Treasury Dealer as having a maturity comparable to the remaining term of the Notes to be redeemed that would be utilized, at the time of selection and in accordance with customary financing practice, in pricing new issues of corporate debt securities of comparable maturity to the remaining term of the Notes being redeemed.

A-4

“Comparable Treasury Price” means (1) the average of the remaining Reference Treasury Dealer Quotations for the Redemption Date, after excluding the highest and lowest Reference Treasury Dealer Quotations, or (2) if the Quotation Agent obtains fewer than four such Reference Treasury Dealer Quotations, the average of all such quotations.

“Quotation Agent” means a Reference Treasury Dealer selected by the Company.

“Reference Treasury Dealer” means, with respect to the Notes, each of (i) BofA Securities, Inc., (ii) BMO Capital Markets Corp., (iii) a primary U.S. government securities dealer selected by MUFG Securities Americas Inc., (iv) a primary U.S. government securities dealer selected by Truist Securities, Inc. and (v) a primary U.S. government securities dealer selected by KKR Capital Markets LLC, or their respective affiliates which are primary U.S. government securities dealers and their respective successors; provided, however, that if any of the foregoing or their affiliates shall cease to be a primary U.S. government securities dealer in the United States, or a Primary Treasury Dealer, the Company shall select another Primary Treasury Dealer.

“Reference Treasury Dealer Quotations” means, with respect to each Reference Treasury Dealer and any Redemption Date, the average, as determined by the Quotation Agent, of the bid and asked prices for the Comparable Treasury Issue (expressed in each case as a percentage of its principal amount) quoted in writing to the Quotation Agent by such Reference Treasury Dealer at 3:30 p.m. New York City time on the third Business Day preceding such Redemption Date.

“Treasury Rate” means, with respect to any Redemption Date, the rate per annum equal to the semi-annual equivalent yield-to-maturity of the Comparable Treasury Issue (computed as of the third Business Day immediately preceding the redemption), assuming a price for the Comparable Treasury Issue (expressed as a percentage of its principal amount) equal to the Comparable Treasury Price for such Redemption Date. The Redemption Price and the Treasury Rate will be determined by the Company.

All determinations made by any Reference Treasury Dealer, including the Quotation Agent, with respect to determining the Redemption Price will be final and binding absent manifest error.

Notice of redemption shall be given in writing and mailed, first-class postage prepaid or by overnight courier guaranteeing next-day delivery, to each Holder of the Securities to be redeemed, not less than thirty (30) nor more than sixty (60) days prior to the Redemption Date, at the Holder’s address appearing in the Security Register. All notices of redemption shall contain the information set forth in Section 1104 of the Base Indenture.

Any exercise of the Company’s option to redeem the Securities will be done in compliance with the Investment Company Act, to the extent applicable.

If the Company elects to redeem only a portion of the Securities, the particular Securities to be redeemed will be selected in accordance with the applicable procedures of the Trustee and, so long as the Securities are registered to the Depositary or its nominee, the Depositary. In the event of redemption of this Security in part only, a new Security or Securities of this series and of like tenor for the unredeemed portion hereof will be issued in the name of the Holder hereof upon the cancellation hereof; provided, however, that no such partial redemption shall reduce the portion of the principal amount of a Security not redeemed to less than $2,000.

Unless the Company defaults in payment of the Redemption Price, on and after the Redemption Date, interest will cease to accrue on the Securities called for redemption.

Holders will have the right to require the Company to repurchase their Securities upon the occurrence of a Change of Control Repurchase Event as set forth in the Indenture.

The Indenture contains provisions for defeasance at any time of the entire indebtedness of this Security or certain restrictive covenants and Events of Default with respect to this Security, in each case upon compliance with certain conditions set forth in the Indenture.

A-5

If an Event of Default with respect to Securities of this series shall occur and be continuing (other than Events of Default related to certain events of bankruptcy, insolvency or reorganization as set forth in the Indenture), the principal of the Securities of this series may be declared due and payable in the manner and with the effect provided in the Indenture. In the case of certain events of bankruptcy, insolvency or reorganization described in the Indenture, 100% of the principal of and accrued and unpaid interest on the Securities will automatically become due and payable.

The Indenture permits, with certain exceptions as therein provided, the amendment thereof and the modification of the rights and obligations of the Company and the rights of the Holders of the Securities of each series to be affected under the Indenture at any time by the Company and the Trustee with the consent of the Holders of not less than a majority in principal amount of the Securities at the time Outstanding of each series to be affected. The Indenture also contains provisions permitting the Holders of specified percentages in principal amount of the Securities of each series at the time Outstanding, on behalf of the Holders of all Securities of such series, to waive compliance by the Company with certain provisions of the Indenture and certain past defaults under the Indenture and their consequences. Any such consent or waiver by the Holder of this Security shall be conclusive and binding upon such Holder and upon all future Holders of this Security and of any Security issued upon the registration of transfer hereof or in exchange herefor or in lieu hereof, whether or not notation of such consent or waiver is made upon this Security.

As provided in and subject to the provisions of the Indenture, the Holder of this Security shall not have the right to institute any proceeding with respect to the Indenture or for the appointment of a receiver or trustee or for any other remedy thereunder, unless such Holder shall have previously given the Trustee written notice of a continuing Event of Default with respect to the Securities of this series, the Holders of not less than 25% in principal amount of the Securities of this series at the time Outstanding shall have made written request to the Trustee to institute proceedings in respect of such Event of Default as Trustee and offered the Trustee indemnity, security, or both, satisfactory to the Trustee, against the costs, expenses and liabilities to be incurred in compliance with such request, and the Trustee shall not have received from the Holders of a majority in principal amount of Securities of this series at the time Outstanding a direction inconsistent with such request, and shall have failed to institute any such proceeding, for sixty (60) days after receipt of such notice, request and offer of indemnity and/or security. The foregoing shall not apply to any suit instituted by the Holder of this Security for the enforcement of any payment of principal hereof or any premium or interest hereon on or after the respective due dates expressed herein.

No reference herein to the Indenture and no provision of this Security or of the Indenture shall alter or impair the obligation of the Company, which is absolute and unconditional, to pay the principal of and any premium and interest on this Security at the times, place and rate, and in the coin or currency, herein prescribed.

As provided in the Indenture and subject to certain limitations therein set forth, the transfer of this Security is registrable in the Security Register, upon surrender of this Security for registration of transfer at the office or agency of the Company in any place where the principal of and any premium and interest on this Security are payable, duly endorsed by, or accompanied by a written instrument of transfer in form satisfactory to the Company and the Security Registrar duly executed by, the Holder hereof or his attorney duly authorized in writing, and thereupon one or more new Securities of this series and of like tenor, of authorized denominations and for the same aggregate principal amount, will be issued to the designated transferee or transferees.

The Securities of this series are issuable only in registered form without coupons in denominations of $2,000 and any integral multiples of $1,000 in excess thereof. As provided in the Indenture and subject to certain limitations therein set forth, Securities of this series are exchangeable for a like aggregate principal amount of Securities of this series and of like tenor of a different authorized denomination, as requested by the Holder surrendering the same.

No service charge shall be made for any such registration of transfer or exchange, but the Company or Trustee may require payment of a sum sufficient to cover any tax or other governmental charge payable in connection therewith.

Prior to due presentment of this Security for registration of transfer, the Company, the Trustee and any agent of the Company or the Trustee may treat the Person in whose name this Security is registered as the owner hereof for all purposes, whether or not this Security be overdue, and neither the Company, the Trustee nor any such agent shall be affected by notice to the contrary.

A-6

All terms used in this Security which are defined in the Indenture shall have the meanings assigned to them in the Indenture.

To the extent any provision of this Security conflicts with the express provisions of the Indenture, the provisions of the Indenture shall govern and be controlling.

The Indenture and this Security shall be governed by and construed in accordance with the laws of the State of New York, without regard to principles of conflicts of laws.

A-7

Exhibit 4.3

EXECUTION VERSION

TENTH SUPPLEMENTAL INDENTURE

between

FS KKR CAPITAL CORP.

and

U.S. BANK NATIONAL ASSOCIATION,

as Trustee

Dated as of October 12, 2021

TENTH SUPPLEMENTAL INDENTURE

THIS TENTH SUPPLEMENTAL INDENTURE (this “Tenth Supplemental Indenture”), dated as of October 12, 2021, is between FS KKR Capital Corp., a Maryland corporation (the “Company”), and U.S. Bank National Association, as trustee (the “Trustee”). All capitalized terms used herein shall have the meaning set forth in the Base Indenture (as defined below) unless otherwise defined herein.

RECITALS OF THE COMPANY

The Company and the Trustee executed and delivered an Indenture, dated as of July 14, 2014 (the “Base Indenture”), as amended and supplemented by the First Supplemental Indenture, dated as of July 14, 2014, the Second Supplemental Indenture, dated as of December 3, 2014, the Third Supplemental Indenture, dated as of April 30, 2015, the Fourth Supplemental Indenture, dated as of July 15, 2019, the Fifth Supplemental Indenture, dated as of November 20, 2019, the Sixth Supplemental Indenture, dated as of April 30, 2020, the Seventh Supplemental Indenture, dated as of December 10, 2020, the Eighth Supplemental Indenture, dated as of June 17, 2021, the Ninth Supplemental Indenture, dated as of October 12, 2021 and this Tenth Supplemental Indenture (the “Tenth Supplemental Indenture,” and together with the Base Indenture, the “Indenture”), to provide for the issuance by the Company from time to time of the Company’s unsecured debentures, notes or other evidences of indebtedness (the “Securities”), to be issued in one or more series as provided in the Base Indenture.

The Company desires to issue and sell $750,000,000 aggregate principal amount of the Company’s 3.125% Notes due 2028 (the “Notes”).

Sections 901(4) and 901(6) of the Base Indenture provide that without the consent of Holders of the Securities of any series issued under the Base Indenture (as supplemented or amended from time to time by one or more indentures supplemental thereto), the Company, when authorized by or pursuant to a Board Resolution, and the Trustee, at any time and from time to time, may enter into one or more indentures supplemental to the Base Indenture to (i) change or eliminate any of the provisions of the Base Indenture (as supplemented or amended from time to time by one or more indentures supplemental thereto) when there is no Security Outstanding of any series created prior to the execution of the supplemental indenture that is entitled to the benefit of such provision and (ii) establish the form or terms of Securities of any series as permitted by Section 201 and Section 301 of the Base Indenture.

The Company desires to establish the form and terms of the Notes and to modify, alter, supplement and change certain provisions of the Base Indenture for the benefit of the Holders of the Notes (subject to amendment as may be provided in a future supplemental indenture to the Indenture (“Future Supplemental Indenture”)).

The Company has duly authorized the execution and delivery of this Tenth Supplemental Indenture to provide for the issuance of the Notes and all acts and things necessary to make this Tenth Supplemental Indenture a valid, binding, and legal obligation of the Company and to constitute a valid agreement of the Company, in accordance with its terms, have been done and performed.

NOW, THEREFORE, for and in consideration of the premises and the purchase of the Notes by the Holders thereof, it is mutually agreed, for the equal and proportionate benefit of all Holders of the Notes, as follows:

ARTICLE I

TERMS OF THE NOTES

Section 1.01.    The following terms relating to the Notes are hereby established:

(a)    The Notes shall constitute a series of Senior Securities having the title “3.125% Notes due 2028”. The Notes shall bear a CUSIP number of 302635 AK3 and an ISIN number of US302635AK33.

(b)    The aggregate principal amount of the Notes that may be initially authenticated and delivered under the Indenture (except for Notes authenticated and delivered upon registration of, transfer of, or in exchange for, or in lieu of, other Notes pursuant to Sections 304, 305, 306, 906, 1107 or 1305 of the Base Indenture, and except for any Securities that, pursuant to Section 303 of the Base Indenture, are deemed never to have been authenticated and delivered under the Indenture) shall be $750,000,000. Under a Board Resolution, Officers’ Certificate pursuant to Board Resolutions or an indenture supplement, the Company may from time to time, without the consent of the Holders of Notes, issue additional Notes (in any such case “Additional Notes”) having the same ranking and the same interest rate, maturity and other terms as the Notes; provided that, if such Additional Notes are not fungible with the Notes (or any other tranche of Additional Notes) for U.S. federal income tax purposes, then such Additional Notes will have different CUSIP numbers from the Notes (and any such other tranche of Additional Notes). Any Additional Notes and the existing Notes will constitute a single series under the Indenture and all references to the relevant Notes herein shall include the Additional Notes unless the context otherwise requires.

(c)    The entire outstanding principal of the Notes shall be payable on October 12, 2028, unless earlier redeemed or repurchased in accordance with the provisions of this Tenth Supplemental Indenture.

(d)    The rate at which the Notes shall bear interest shall be 3.125% per annum (the “Applicable Interest Rate”). The date from which interest shall accrue on the Notes shall be October 12, 2021, or the most recent Interest Payment Date to which interest has been paid or provided for; the Interest Payment Dates for the Notes shall be April 12 and October 12 of each year, commencing April 12, 2022 (if an Interest Payment Date falls on a day that is not a Business Day, then the applicable interest payment will be made on the next succeeding Business Day and no additional interest will accrue as a result of such delayed payment); the initial interest period will be the period from and including October 12, 2021 (or the most recent Interest Payment Date to which interest has been paid or provided for), to, but excluding, the initial Interest Payment Date, and the subsequent interest periods will be the periods from and including an Interest Payment Date to, but excluding, the next Interest Payment Date or the Stated Maturity, as the case may be. Interest so payable, and punctually paid or duly provided for, on any Interest Payment Date, will be paid to the Person in whose name the Note (or one or more Predecessor Securities) is registered at 5:00 p.m. New York City time, or the close of business, on the Regular Record Date for such interest, which shall be April 1 and October 1 (whether or not a Business Day), as the case may be, next preceding such Interest Payment Date. Payment of principal of (and premium, if any, on) and any such interest on the Notes will be made at the office of the Trustee located at One Federal Street, 10th Floor, Boston, MA 02110 and at such other address as designated by the Trustee, in such coin or currency of the United States of America as at the time of payment is legal tender for payment of public and private debts; provided, however, that at the option of the Company, payment of interest may be made by check mailed to the address of the Person entitled thereto as such address shall appear in the Security Register. Interest on the Notes will be computed on the basis of a 360-day year of twelve 30-day months.

(e)    The Notes shall be initially issuable in global form (each such Note, a “Global Note”). The Global Notes and the Trustee’s certificate of authentication thereon shall be substantially in the form of Exhibit A to this Tenth Supplemental Indenture. Each Global Note shall represent the outstanding Notes as shall be specified therein and each shall provide that it shall represent the aggregate amount of outstanding Notes from time to time endorsed thereon and that the aggregate amount of outstanding Notes represented thereby may from time to

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time be reduced or increased, as appropriate, to reflect exchanges and redemptions. Any endorsement of a Global Note to reflect the amount of any increase or decrease in the amount of outstanding Notes represented thereby shall be made by the Trustee or the Security Registrar, in accordance with Sections 203 and 305 of the Base Indenture.

(f)    The depositary for such Global Notes (the “Depositary”) shall be The Depository Trust Company, New York, New York, until a successor shall have been appointed and becomes such person, and thereafter, Depositary shall mean or include such successor. The Security Registrar with respect to the Global Notes shall be the Trustee.

(g)    The Notes shall be defeasible pursuant to Section 1402 or Section 1403 of the Base Indenture. Covenant defeasance contained in Section 1403 of the Base Indenture shall apply to the covenants contained in Sections 1007 and 1008 of the Indenture.

(h)    The Notes shall be redeemable pursuant to Section 1101 of the Base Indenture and as follows:

(i)    The Notes will be redeemable, in whole or in part, at any time, or from time to time, at the option of the Company, at a Redemption Price equal to the greater of the following amounts, plus, in each case, accrued and unpaid interest, if any, to, but excluding, the Redemption Date:

(ii)    Notwithstanding the foregoing, at any time on or after the Par Call Date, the Company may redeem some or all of the Notes at any time, or from time to time, at a Redemption Price equal to 100% of the principal amount of the Notes to be redeemed plus, in each case, accrued and unpaid interest, if any, to, but excluding, the Redemption Date.

For purposes of calculating the Redemption Price in connection with the redemption of the Notes, on any Redemption Date, the following terms have the meanings set forth below:

“Comparable Treasury Issue” means the United States Treasury security selected by the Reference Treasury Dealer as having a maturity comparable to the remaining term of the Notes to be redeemed (assuming the notes matured on the applicable Par Call Date) that would be utilized, at the time of selection and in accordance with customary financing practice, in pricing new issues of corporate debt securities of comparable maturity to the remaining term of the Notes being redeemed.

“Par Call Date” means August 12, 2028, which is the date that is two months prior to the maturity date of the Notes.

“Comparable Treasury Price” means (1) the average of the remaining Reference Treasury Dealer Quotations for the Redemption Date, after excluding the highest and lowest Reference Treasury Dealer Quotations, or (2) if the Quotation Agent obtains fewer than four such Reference Treasury Dealer Quotations, the average of all such quotations.

“Quotation Agent” means a Reference Treasury Dealer selected by the Company.

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“Reference Treasury Dealer” means, with respect to the Notes, each of (i) BofA Securities, Inc., (ii) BMO Capital Markets Corp., (iii) a primary U.S. government securities dealer selected by MUFG Securities Americas Inc., (iv) a primary U.S. government securities dealer selected by Truist Securities, Inc. and (v) a primary U.S. government securities dealer selected by KKR Capital Markets LLC, or their respective affiliates which are primary U.S. government securities dealers and their respective successors; provided, however, that if any of the foregoing or their affiliates shall cease to be a primary U.S. government securities dealer in the United States, or a Primary Treasury Dealer, the Company shall select another Primary Treasury Dealer.

“Reference Treasury Dealer Quotations” means, with respect to each Reference Treasury Dealer and any Redemption Date, the average, as determined by the Quotation Agent, of the bid and asked prices for the Comparable Treasury Issue (expressed in each case as a percentage of its principal amount) quoted in writing to the Quotation Agent by such Reference Treasury Dealer at 3:30 p.m. New York City time on the third Business Day preceding such Redemption Date.

“Treasury Rate” means, with respect to any Redemption Date, the rate per annum equal to the semi-annual equivalent yield-to-maturity of the Comparable Treasury Issue (computed as of the third Business Day immediately preceding the redemption), assuming a price for the Comparable Treasury Issue (expressed as a percentage of its principal amount) equal to the Comparable Treasury Price for such Redemption Date. The Redemption Price and the Treasury Rate will be determined by the Company.

All determinations made by any Reference Treasury Dealer, including the Quotation Agent, with respect to determining the Redemption Price will be final and binding absent manifest error.

(i)    Notice of redemption shall be given in writing and mailed, first-class postage prepaid or by overnight courier guaranteeing next-day delivery, to each Holder of the Notes to be redeemed, not less than thirty (30) nor more than sixty (60) days prior to the Redemption Date, at the Holder’s address appearing in the Security Register. All notices of redemption shall contain the information set forth in Section 1104 of the Base Indenture.

(ii)    Any exercise of the Company’s option to redeem the Notes will be done in compliance with the Investment Company Act, to the extent applicable.

(iii)    If the Company elects to redeem only a portion of the Notes, the particular Notes to be redeemed will be selected in accordance with the applicable procedures of the Trustee and, so long as the Notes are registered to the Depositary or its nominee, the Depositary; provided, however, that no such partial redemption shall reduce the portion of the principal amount of a Note not redeemed to less than $2,000.

(iv)    Unless the Company defaults in payment of the Redemption Price, on and after the Redemption Date, interest will cease to accrue on the Notes called for redemption hereunder.

(i)    The Notes shall not be subject to any sinking fund pursuant to Section 1201 of the Base Indenture.

(j)    The Notes shall be issuable in denominations of $2,000 and integral multiples of $1,000 in excess thereof.

(k)    Holders of the Notes will not have the option to have the Notes repaid prior to the Stated Maturity other than in accordance with Article Thirteen of the Indenture.

ARTICLE II

DEFINITIONS AND OTHER PROVISIONS OF GENERAL APPLICATION

Section 2.01.    Except as may be provided in a Future Supplemental Indenture, for the benefit of the Holders of the Notes but no other series of Securities under the Base Indenture (as supplemented or amended from time to time by one or more indentures supplemental thereto), whether now or hereafter issued and Outstanding,

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Article One of the Base Indenture shall be amended by adding the following defined terms to Section 101 in appropriate alphabetical sequence, as follows:

“Below Investment Grade Rating Event” means the Notes are downgraded below Investment Grade by both Rating Agencies on any date from the date of the public notice of an arrangement that results in a Change of Control until the end of the 60-day period following public notice of the occurrence of a Change of Control (which period shall be extended so long as the rating of the Notes is under publicly announced consideration for possible downgrade by either of the Rating Agencies); provided that a Below Investment Grade Rating Event otherwise arising by virtue of a particular reduction in rating shall not be deemed to have occurred in respect of a particular Change of Control (and thus shall not be deemed a Below Investment Grade Rating Event for purposes of the definition of Change of Control Repurchase Event hereunder) if the Rating Agencies making the reduction in rating to which this definition would otherwise apply do not announce or publicly confirm or inform the Trustee in writing at its request that the reduction was the result, in whole or in part, of any event or circumstance comprised of or arising as a result of, or in respect of, the applicable Change of Control (whether or not the applicable Change of Control shall have occurred at the time of the Below Investment Grade Rating Event).

“Change of Control” means the occurrence of any of the following:

(1) the direct or indirect sale, lease, transfer, conveyance or other disposition (other than by way of merger or consolidation) in one or a series of related transactions, of all or substantially all of the assets of the Company and its Controlled Subsidiaries taken as a whole to any “person” or “group” (as those terms are used in Section 13(d)(3) of the Exchange Act), other than to any Permitted Holders; provided that, for the avoidance of doubt, a pledge of assets pursuant to any secured debt instrument of the Company or its Controlled Subsidiaries shall not be deemed to be any such sale, lease, transfer, conveyance or disposition;

(2) the consummation of any transaction (including, without limitation, any merger or consolidation) the result of which is that any “person” or “group” (as those terms are used in Section 13(d)(3) of the Exchange Act) (other than any Permitted Holders) becomes the “beneficial owner” (as defined in Rules 13d-3 and 13d-5 promulgated under the Exchange Act), directly or indirectly, of more than 50% of the outstanding Voting Stock of the Company, measured by voting power rather than number of shares; or

(3) the approval by the Company’s stockholders of any plan or proposal relating to the liquidation or dissolution of the Company.

“Change of Control Repurchase Event” means the occurrence of a Change of Control and a Below Investment Grade Rating Event.

“Controlled Subsidiary” means any Subsidiary of the Company, 50% or more of the outstanding equity interests of which are owned by the Company and its direct or indirect Subsidiaries and of which the Company possesses, directly or indirectly, the power to direct or cause the direction of the management or policies, whether through the ownership of voting equity interests, by agreement or otherwise.

“Fitch” means Fitch Ratings, Inc., also known as Fitch Ratings, or any successor thereto.

“GAAP” means generally accepted accounting principles in the United States set forth in the opinions and pronouncements of the Accounting Principles Board of the American Institute of Certified Public Accountants, the opinions and pronouncements of the Public Company Accounting Oversight Board and the statements and pronouncements of the Financial Accounting Standards Board or in such other statements by such other entity as have been approved by a significant segment of the accounting profession in the United States, which are in effect from time to time.

“Investment Company Act” means the Investment Company Act of 1940, as amended, and the rules, regulations and interpretations promulgated thereunder, to the extent applicable, and any statute successor thereto.

“Investment Grade” means a rating of BBB- or better by Fitch (or its equivalent under any successor rating categories of Fitch) and Baa3 or better by Moody’s (or its equivalent under any successor rating categories of

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Moody’s) (or, in each case, if such Rating Agency ceases to rate the Notes for reasons outside of the Company’s control, the equivalent investment grade credit rating from any Rating Agency selected by the Company as a replacement Rating Agency).

“Moody’s” means Moody’s Investors Service or any successor thereto.

“Permitted Holders” means (i) the Company, (ii) one or more of the Company’s Controlled Subsidiaries and (iii) FS/KKR Advisor, LLC, any Affiliate of FS KKR Advisor, LLC or any entity that is managed by FS/KKR Advisor, LLC that is organized under the laws of a jurisdiction located in the United States of America and in the business of managing or advising clients.

“Rating Agency” means (1) each of Fitch and Moody’s; and (2) if either Fitch or Moody’s ceases to rate the Notes or fails to make a rating of the Notes publicly available for reasons outside of the Company’s control, a “nationally recognized statistical rating organization” as defined in Section 3(a)(62) of the Exchange Act selected by the Company as a replacement agency for Fitch or Moody’s, or both, as the case may be.

“Significant Subsidiary” means any Subsidiary that would be a “significant subsidiary” as defined in Article 1, Rule 1-02 of Regulation S-X under the Exchange Act, as such regulation is in effect on the date of this Indenture (but excluding any Subsidiary which is (a) a non-recourse or limited recourse Subsidiary, (b) a bankruptcy remote special purpose vehicle or (c) is not consolidated with the Company for purposes of GAAP).

“Voting Stock” as applied to stock of any Person, means shares, interests, participations or other equivalents in the equity interest (however designated) in such Person having ordinary voting power for the election of a majority of the directors (or the equivalent) of such Person, other than shares, interests, participations or other equivalents having such power only by reason of the occurrence of a contingency.

Section 2.02.    Except as may be provided in a Future Supplemental Indenture, for the benefit of the Holders of the Notes but no other series of Securities under the Base Indenture (as supplemented or amended from time to time by one or more indentures supplemental thereto), whether now or hereafter issued and Outstanding, Article One of the Base Indenture shall be amended by amending and restating the definitions of “Business Day” and “Subsidiary” in Section 101 as follows:

“Business Day” means, with respect to any Note, any day other than a Saturday, Sunday or a day on which banking institutions in New York are authorized or obligated by law or executive order to close.

“Subsidiary” means (1) any corporation a majority of the outstanding voting stock of which is owned, directly or indirectly, by the Company or by one or more other Subsidiaries of the Company, (2) any other Person (other than a corporation) in which such Person, one or more Subsidiaries of such Person, or such Person and one or more Subsidiaries of such Person, directly or indirectly, at the date of determination thereof has a majority ownership interest, or (3) a partnership in which such Person or Subsidiary of such Person is, at the time, a general partner and in which such Person, directly or indirectly, at the date of determination thereof has a majority ownership interest. For the purposes of this definition, “voting stock” mean stock having voting power for the election of directors, whether at all times or only so long as no senior class of stock has such voting power by reason of any contingency. In addition, for purposes of this definition, “Subsidiary” shall exclude any investments held by the Company in the ordinary course of business which are not, under GAAP, consolidated on the financial statements of the Company and its Subsidiaries.

ARTICLE III

SECURITIES FORMS

Section 3.01.    Except as may be provided in a Future Supplemental Indenture, for the benefit of the Holders of the Notes but no other series of Securities under the Base Indenture (as supplemented or amended from time to time by one or more indentures supplemental thereto), whether now or hereafter issued and Outstanding,

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Article Two of the Base Indenture shall be amended by adding the following new Section 204 thereto, as set forth below:

“Section 204.    Certificated Notes.

Notwithstanding anything to the contrary in the Indenture, Notes in physical, certificated form will be issued and delivered to each person that the Depositary identifies as a beneficial owner of the related Notes only if:

(a)    the Depositary notifies the Company at any time that it is unwilling or unable to continue as depositary for the Notes in global form and a successor depositary is not appointed within 90 days;

(b)    the Depositary ceases to be registered as a clearing agency under the Exchange Act and a successor depositary is not appointed within 90 days; or

(c)    an Event of Default with respect to the Notes has occurred and is continuing and such beneficial owner requests that its Notes be issued in physical, certificated form.”

ARTICLE IV

REMEDIES

Section 4.01.    Except as may be provided in a Future Supplemental Indenture, for the benefit of the Holders of the Notes but no other series of Securities under the Base Indenture (as supplemented or amended from time to time by one or more indentures supplemental thereto), whether now or hereafter issued and Outstanding, Article Five of the Base Indenture shall be amended by replacing clause (2) of Section 501 thereof with the following:

“(2)     default in the payment of the principal of (or premium, if any, on) any Note when it becomes due and payable at its Maturity including upon any Redemption Date or required repurchase date; or”

Section 4.02.    Except as may be provided in a Future Supplemental Indenture, for the benefit of the Holders of the Notes but no other series of Securities under the Base Indenture (as supplemented or amended from time to time by one or more indentures supplemental thereto), whether now or hereafter issued and Outstanding, Section 501 of the Base Indenture shall be amended by replacing clause (4) thereof with the following:

Section 4.03.    Except as may be provided in a Future Supplemental Indenture, for the benefit of the Holders of the Notes but no other series of Securities under the Base Indenture (as supplemented or amended from time to time by one or more indentures supplemental thereto), whether now or hereafter issued and Outstanding, Article Five of the Base Indenture shall be amended by adding as clause (9) of Section 501 thereof the following:

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Section 4.04.    Except as may be provided in a Future Supplemental Indenture, for the benefit of Holders of the Notes but no other series of Securities under the Base Indenture (as supplemented or amended from time to time by one or more indentures supplemental thereto), whether now or hereafter issued and Outstanding, Section 501 of the Base Indenture shall be amended by replacing clause (7) thereof with the following:

Section 4.05.    Except as may be provided in a Future Supplemental Indenture, for the benefit of Holders of the Notes but no other series of Securities under the Base Indenture (as supplemented or amended from time to time by one or more indentures supplemental thereto), whether now or hereafter issued and Outstanding, Article Five of the Base Indenture shall be amended by amending clause (6) of Section 501 thereof as follows: the words “90 consecutive days” in the final clause thereof shall be replaced with the words “60 consecutive days”.

Section 4.06.    Except as may be provided in a Future Supplemental Indenture, for the benefit of the Holders of the Notes but no other series of Securities under the Base Indenture (as supplemented or amended from time to time by one or more indentures supplemental thereto), whether now or hereafter issued and Outstanding, Article Five of the Base Indenture shall be amended by replacing the first paragraph of Section 502 thereof with the following:

“If an Event of Default with respect to the Notes occurs and is continuing, then and in every such case (other than an Event of Default specified in Section 501(5) or 501(6)), the Trustee or the Holders of not less than 25% in principal amount of the Outstanding Notes may (and the Trustee shall at the request of such Holders) declare the principal of all the Outstanding Notes to be due and payable immediately, by a notice in writing to the Company (and to the Trustee if given by the Holders), and upon any such declaration such principal or specified portion thereof shall become immediately due and payable; provided that 100% of the principal of, and accrued and unpaid interest on, the Notes will automatically become due and payable in the case of an Event of Default specified in Section 501(5) or 501(6) hereof.”

Section 4.07.    Except as may be provided in a Future Supplemental Indenture, for the benefit of Holders of the Notes but no other series of Securities under the Base Indenture (as supplemented or amended from time to time by one or more indentures supplemental thereto), whether now or hereafter issued and Outstanding, Article Five of the Base Indenture shall be amended by replacing clause (3) of Section 512 thereof with the following:

ARTICLE V

THE TRUSTEE

Section 5.01.    Except as may be provided in a Future Supplemental Indenture, for the benefit of Holders of the Notes but no other series of Securities under the Base Indenture (as supplemented or amended from time to time by one or more indentures supplemental thereto), whether now of hereafter issued and Outstanding, Article Six of the Base Indenture shall be amended by replacing the final proviso of Section 601 thereof with the following:

“and provided further that in the case of any Default or breach of the character specified in Section 501(4) with respect to the Securities of such series, no such notice to Holders shall be given until at least 60 days after the occurrence thereof”

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ARTICLE VI

COVENANTS

Section 6.01.    Except as may be provided in a Future Supplemental Indenture, for the benefit of Holders of the Notes but no other series of Securities under the Base Indenture (as supplemented or amended from time to time by one or more indentures supplemental thereto), whether now or hereafter issued and Outstanding, Article Ten of the Base Indenture shall be amended by replacing clause (1) of Section 1005 thereof with the following:

Section 6.02.    Except as may be provided in a Future Supplemental Indenture, for the benefit of the Holders of the Notes but no other series of Securities under the Base Indenture (as supplemented or amended from time to time by one or more indentures supplemental thereto), whether now or hereafter issued and Outstanding, Article Ten of the Base Indenture shall be amended by adding the following new Sections 1007 and 1008 thereto, each as set forth below:

“Section 1007    Section 18(a)(1)(A) of the Investment Company Act.

The Company hereby agrees that for the period of time during which the Notes are Outstanding, the Company will not violate, whether or not it is subject to, Section 18(a)(1)(A) of the Investment Company Act as modified by Section 61(a)(1) and (2) of the Investment Company Act or any successor provisions, as such obligations may be amended or superseded, giving effect to any exemptive relief granted to the Company by the Securities and Exchange Commission.”

“Section 1008    Commission Reports and Reports to Holders.

If, at any time, the Company is not subject to the reporting requirements of Sections 13 or 15(d) of the Exchange Act to file any periodic reports with the Commission, the Company agrees to furnish to the Holders of the Notes and the Trustee for the period of time during which the Notes are Outstanding: (i) within 90 days after the end of each fiscal year of the Company, audited annual consolidated financial statements of the Company and (ii) within 45 days after the end of each fiscal quarter of the Company (other than the Company’s fourth fiscal quarter), unaudited interim consolidated financial statements of the Company. All such financial statements shall be prepared, in all material respects, in accordance with GAAP, as applicable.”

ARTICLE VII

CONSOLIDATION, MERGER, CONVEYANCE OR TRANSFER

Except as may be provided in a Future Supplemental Indenture, for the benefit of the Holders of the Notes but no other series of Securities under the Base Indenture (as supplemented or amended from time to time by one or more indentures supplemental thereto), whether now or hereafter issued and Outstanding, Article Eight of the Base Indenture shall be amended by replacing Section 801 with the following:

“Section 801    Merger, Consolidation or Sale of Assets.

The Company shall not merge or consolidate with or into any other Person (other than a merger of a wholly owned Subsidiary of the Company into the Company), or sell, transfer, lease, convey or otherwise dispose of all or substantially all of its property (provided that, for the avoidance of doubt, a pledge of assets pursuant to any secured debt instrument

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of the Company or its Controlled Subsidiaries shall not be deemed to be any such sale, transfer, lease, conveyance or disposition) in any one transaction or series of related transactions unless:

(1) the Company shall be the surviving Person (the “Surviving Person”) or the Surviving Person (if other than the Company) formed by such merger or consolidation or to which such sale, transfer, lease, conveyance or disposition is made shall be a corporation or limited liability company organized and existing under the laws of the United States of America or any state or territory thereof;

(2) the Surviving Person (if other than the Company) expressly assumes, by supplemental indenture in form reasonably satisfactory to the Trustee, executed and delivered to the Trustee by such Surviving Person, the due and punctual payment of the principal of, and premium, if any, and interest on, all the Notes Outstanding, and the due and punctual performance and observance of all the covenants and conditions of this Indenture to be performed by the Company;

(3) immediately before and immediately after giving effect to such transaction or series of related transactions, no Default or Event of Default shall have occurred and be continuing; and

(4) the Company shall deliver, or cause to be delivered, to the Trustee, an Officers’ Certificate and an Opinion of Counsel, each stating that such transaction and the supplemental indenture, if any, in respect thereto, comply with this Section 801 and that all conditions precedent in this Indenture relating to such transaction have been complied with.

For the purposes of this Section 801, the sale, transfer, lease, conveyance or other disposition of all the property of one or more Subsidiaries of the Company, which property, if held by the Company instead of such Subsidiaries, would constitute all or substantially all the property of the Company on a consolidated basis, shall be deemed to be the transfer of all or substantially all the property of the Company.”

ARTICLE VIII

OFFER TO REPURCHASE UPON A CHANGE OF CONTROL REPURCHASE EVENT

Except as may be provided in a Future Supplemental Indenture, for the benefit of the Holders of the Notes but no other series of Securities under the Base Indenture (as supplemented or amended from time to time by one or more indentures supplemental thereto), whether now or hereafter issued and Outstanding, Article Thirteen of the Base Indenture shall be amended by replacing Sections 1301 to 1305 with the following:

“Section 1301 Change of Control.

If a Change of Control Repurchase Event occurs, unless the Company shall have exercised its right to redeem the Notes in full, the Company shall make an offer to each Holder of the Notes to repurchase all or any part (in minimum denominations of $2,000 and integral multiples of $1,000 principal amount in excess thereof) of that Holder’s Notes at a repurchase price in cash equal to 100% of the aggregate principal amount of Notes repurchased plus any accrued and unpaid interest on the Notes repurchased to, but not including, the date of purchase. Within 30 days following any Change of Control Repurchase Event or, at the Company’s option, prior to any Change of Control, but after the public announcement of the Change of Control, the Company shall mail a notice to each Holder describing the transaction or transactions that constitute or may constitute the Change of Control Repurchase Event and offering to repurchase Notes on the payment date specified in the notice, which date will be no earlier than 30 days and no later than 60 days from the date such notice is mailed. The notice shall, if mailed prior to the date of consummation of the Change of Control, state that the offer to purchase is conditioned on the Change of Control Repurchase Event occurring on or prior to the payment date specified in the notice. The Company shall comply with the requirements of Rule 14e-1 promulgated under the Exchange Act and any other securities laws and regulations thereunder to the extent those laws and regulations are applicable in connection with the repurchase of the Notes as a result of a Change of Control Repurchase Event.

To the extent that the provisions of any securities laws or regulations conflict with this Section 1301, the Company shall comply with the applicable securities laws and regulations and shall not be deemed to have breached its obligations under this Section 1301 by virtue of such conflict.

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On the Change of Control Repurchase Event payment date, subject to extension if necessary to comply with the provisions of the Investment Company Act, the Company shall, to the extent lawful:

(1) accept for payment all Notes or portions of Notes properly tendered pursuant to its offer;

(2) deposit with the Paying Agent an amount equal to the aggregate purchase price in respect of all Notes or portions of Notes properly tendered; and

(3) deliver or cause to be delivered to the Trustee the Notes properly accepted, together with an Officers’ Certificate stating the aggregate principal amount of Notes being purchased by the Company.

The Paying Agent will promptly remit to each Holder of Notes properly tendered the purchase price for the Notes, and the Trustee will promptly authenticate and mail (or cause to be transferred by book-entry) to each Holder a new Note equal in principal amount to any unpurchased portion of any Notes surrendered; provided that each new Note will be in a minimum principal amount of $2,000 or an integral multiple of $1,000 in excess thereof.

If any Repayment Date upon a Change of Control Repurchase Event falls on a day that is not a Business Day, then the required payment will be made on the next succeeding Business Day and no additional interest will accrue as a result of such delayed payment.

The Company will not be required to make an offer to repurchase the Notes upon a Change of Control Repurchase Event if a third party makes an offer in respect of the Notes in the manner, at the time and otherwise in compliance with the requirements for an offer made by the Company and such third party purchases all Notes properly tendered and not withdrawn under its offer.”

ARTICLE IX

MISCELLANEOUS

Section 9.01.    This Tenth Supplemental Indenture and the Notes shall be governed by and construed in accordance with the laws of the State of New York, without regard to principles of conflicts of laws that would cause the application of laws of another jurisdiction. This Tenth Supplemental Indenture is subject to the provisions of the Trust Indenture Act that are required to be part of the Indenture and shall, to the extent applicable, be governed by such provisions.

Section 9.02.    In case any provision in this Tenth Supplemental Indenture or in the Notes shall be invalid, illegal or unenforceable, the validity, legality and enforceability of the remaining provisions shall not in any way be affected or impaired thereby.

Section 9.03.    This Tenth Supplemental Indenture may be executed in counterparts, each of which will be an original, but such counterparts will together constitute but one and the same Tenth Supplemental Indenture. The exchange of copies of this Tenth Supplemental Indenture and of signature pages by facsimile, .pdf transmission, email or other electronic means shall constitute effective execution and delivery of this Tenth Supplemental Indenture for all purposes. Signatures of the parties hereto transmitted by facsimile, .pdf transmission, email or other electronic means shall be deemed to be their original signatures for all purposes. For the avoidance of doubt, all notices, approvals, consents, requests and any communications hereunder or with respect to the Notes must be in writing (provided that any communication sent to the Trustee hereunder must be in the form of a document that is signed manually or by way of a digital signature provided by DocuSign or Adobe (or such other digital signature provider as specified in writing to the Trustee by the authorized representative), in English. The Company agrees to assume all risks arising out of the use of using digital signatures and electronic methods to submit communications to the Trustee, including without limitation the risk of the Trustee acting on unauthorized instructions, and the risk of interception and misuse by third parties.

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Section 9.04.    The Base Indenture, as supplemented and amended by this Tenth Supplemental Indenture, is in all respects ratified and confirmed, and the Base Indenture and this Tenth Supplemental Indenture shall be read, taken and construed as one and the same instrument with respect to the Notes. All provisions included in this Tenth Supplemental Indenture supersede any conflicting provisions included in the Base Indenture with respect to the Notes, unless not permitted by law. The Trustee accepts the trusts created by the Base Indenture, as supplemented by this Tenth Supplemental Indenture, and agrees to perform the same upon the terms and conditions of the Base Indenture, as supplemented by this Tenth Supplemental Indenture.

Section 9.05.    The provisions of this Tenth Supplemental Indenture shall become effective as of the date hereof.

Section 9.06.    Notwithstanding anything else to the contrary herein, the terms and provisions of this Tenth Supplemental Indenture shall apply only to the Notes and shall not apply to any other series of Securities under the Base Indenture (as supplemented or amended from time to time by one or more indentures supplemental thereto) and this Tenth Supplemental Indenture shall not and does not otherwise affect, modify, alter, supplement or change the terms and provisions of any other series of Securities under the Base Indenture (as supplemented or amended from time to time by one or more indentures supplemental thereto), whether now or hereafter issued and Outstanding.

Section 9.07.    The recitals contained herein and in the Notes shall be taken as the statements of the Company, and the Trustee assumes no responsibility for their correctness. The Trustee makes no representations as to the validity or sufficiency of this Tenth Supplemental Indenture, the Notes or any Additional Notes, except that the Trustee represents that it is duly authorized to execute and deliver this Tenth Supplemental Indenture, authenticate the Notes and any Additional Notes and perform its obligations hereunder. The Trustee shall not be accountable for the use or application by the Company of the Notes or any Additional Notes or the proceeds thereof.

- 12 -

IN WITNESS WHEREOF, the parties hereto have caused this Tenth Supplemental Indenture to be duly executed as of the date first above written.

[Signature page to Tenth Supplemental Indenture]

Exhibit A – Form of Global Note

This Security is a Global Note within the meaning of the Indenture hereinafter referred to and is registered in the name of The Depository Trust Company or a nominee thereof. This Security may not be exchanged in whole or in part for a Security registered, and no transfer of this Security in whole or in part may be registered, in the name of any Person other than The Depository Trust Company or a nominee thereof, except in the limited circumstances described in the Indenture.

Unless this certificate is presented by an authorized representative of The Depository Trust Company to the issuer or its agent for registration of transfer, exchange or payment and such certificate issued in exchange for this certificate is registered in the name of Cede & Co., or such other name as requested by an authorized representative of The Depository Trust Company, any transfer, pledge or other use hereof for value or otherwise by or to any person is wrongful, as the registered owner hereof, Cede & Co., has an interest herein.

FS KKR Capital Corp.

3.125% Notes due 2028

FS KKR Capital Corp., a corporation duly organized and existing under the laws of Maryland (herein called the “Company”, which term includes any successor Person under the Indenture hereinafter referred to), for value received, hereby promises to pay to Cede & Co., or registered assigns, the principal sum of                      (U.S. $        ) on October 12, 2028, and to pay interest thereon from October 12, 2021 or from the most recent Interest Payment Date to which interest has been paid or duly provided for, semi-annually on April 12 and October 12 of each year, commencing April 12, 2022, at the rate of 3.125% per annum until the principal hereof is paid or made available for payment. The interest so payable, and punctually paid or duly provided for, on any Interest Payment Date will, as provided in such Indenture, be paid to the Person in whose name this Security is registered at the close of business on the Regular Record Date for such interest, which shall be April 1 and October 1 (whether or not a Business Day), as the case may be, next preceding such Interest Payment Date. Any such interest not so punctually paid or duly provided for will forthwith cease to be payable to the Holder on such Regular Record Date and may either be paid to the Person in whose name this Security is registered at the close of business on a Special Record Date for the payment of such Defaulted Interest to be fixed by the Trustee, notice whereof shall be given to Holders of Securities of this series not less than 10 days prior to such Special Record Date, or be paid at any time in any other lawful manner not inconsistent with the requirements of any securities exchange on which the Securities of this series may be listed, and upon such notice as may be required by such exchange, all as more fully provided in said Indenture. This Security may be issued as part of a series.

Payment of the principal of (and premium, if any, on) and any such interest on this Security will be made at the office of the Trustee located at One Federal Street, 10th Floor, Boston, MA 02110 and at such other address as designated by the Trustee, in such coin or currency of the United States of America as at the time of payment is legal tender for payment of public and private debts; provided, however, that at the option of the Company payment of interest may be made by check mailed to the address of the Person entitled thereto as such address shall appear in the Security Register; provided, further, however, that so long as this Security is registered to Cede & Co., such payment will be made by wire transfer in accordance with the procedures established by The Depository Trust Company and the Trustee.

Reference is hereby made to the further provisions of this Security set forth on the reverse hereof, which further provisions shall for all purposes have the same effect as if set forth at this place.

Unless the certificate of authentication hereon has been executed by the Trustee referred to on the reverse hereof by manual signature, this Security shall not be entitled to any benefit under the Indenture or be valid or obligatory for any purpose.

A-1

IN WITNESS WHEREOF, the Company has caused this instrument to be duly executed.

Dated: October 12, 2021

A-2

This is one of the Securities of the series designated therein referred to in the within-mentioned Indenture.

Dated: October 12, 2021

A-3

FS KKR Capital Corp.

3.125% Notes due 2028

This Security is one of a duly authorized issue of Senior Securities of the Company (herein called the “Securities”), issued and to be issued in one or more series under an Indenture, dated as of July 14, 2014 (herein called the “Base Indenture”, which term shall have the meaning assigned to it in such instrument), between the Company and U.S. Bank National Association, as Trustee (herein called the “Trustee”, which term includes any successor trustee under the Base Indenture), and reference is hereby made to the Base Indenture for a statement of the respective rights, limitations of rights, duties and immunities thereunder of the Company, the Trustee, and the Holders of the Securities and of the terms upon which the Securities are, and are to be, authenticated and delivered, as amended and supplemented by the First Supplemental Indenture, dated as of July 14, 2014, the Second Supplemental Indenture, dated as of December 3, 2014, the Third Supplemental Indenture, dated as of April 30, 2015, the Fourth Supplemental Indenture, dated as of July 15, 2019, the Fifth Supplemental Indenture, dated as of November 20, 2019, the Sixth Supplemental Indenture, dated as of April 30, 2020, the Seventh Supplemental Indenture, dated as of December 10, 2020, the Eighth Supplemental Indenture, dated as of June 17, 2021, the Ninth Supplemental Indenture, dated as of October 12, 2021 and this Tenth Supplemental Indenture, relating to the Securities, dated as of October 12, 2021, by and between the Company and the Trustee (herein called the “Tenth Supplemental Indenture”; and the Tenth Supplemental Indenture and the Base Indenture collectively are herein called the “Indenture”). In the event of any conflict between the Base Indenture and the Tenth Supplemental Indenture, the Tenth Supplemental Indenture shall govern and control.

This Security is one of the series designated on the face hereof, initially limited in aggregate principal amount to $        . Under a Board Resolution, Officers’ Certificate pursuant to Board Resolutions or an indenture supplement, the Company may from time to time, without the consent of the Holders of Securities, issue additional Securities of this series (in any such case “Additional Securities”) having the same ranking and the same interest rate, maturity and other terms as the Securities, provided that, if such Additional Securities are not fungible with the Securities (or any other tranche of Additional Securities) for U.S. federal income tax purposes, then such Additional Securities will have different CUSIP numbers from the Securities represented hereby (and any such other tranche of Additional Securities). Any Additional Securities and the existing Securities will constitute a single series under the Indenture and all references to the relevant Securities herein shall include the Additional Securities unless the context otherwise requires. The aggregate amount of outstanding Securities represented hereby may from time to time be reduced or increased, as appropriate, to reflect exchanges and redemptions.

The Securities of this series are subject to redemption in whole or in part at any time or from time to time, at the option of the Company, at a Redemption Price per security equal to the greater of the following amounts, plus, in each case, accrued and unpaid interest, if any, to, but excluding, the Redemption Date:

Notwithstanding the foregoing, at any time on or after the Par Call Date, the Company may redeem some or all of the Notes, at any time, or from time to time, at a Redemption Price equal to 100% of the principal amount of the Notes to be redeemed plus, in each case, accrued and unpaid interest, if any, to, but excluding, the Redemption Date.

A-4

For purposes of calculating the Redemption Price in connection with the redemption of the Notes, on any Redemption Date, the following terms have the meanings set forth below:

“Comparable Treasury Issue” means the United States Treasury security selected by the Reference Treasury Dealer as having a maturity comparable to the remaining term of the Notes to be redeemed (assuming the notes matured on the applicable Par Call Date) that would be utilized, at the time of selection and in accordance with customary financing practice, in pricing new issues of corporate debt securities of comparable maturity to the remaining term of the Notes being redeemed.

“Comparable Treasury Price” means (1) the average of the remaining Reference Treasury Dealer Quotations for the Redemption Date, after excluding the highest and lowest Reference Treasury Dealer Quotations, or (2) if the Quotation Agent obtains fewer than four such Reference Treasury Dealer Quotations, the average of all such quotations.

“Par Call Date” means August 12, 2028, which is the date that is two months prior to the maturity date of the Notes.

“Quotation Agent” means a Reference Treasury Dealer selected by the Company.

“Reference Treasury Dealer” means, with respect to the Notes, each of (i) BofA Securities, Inc., (ii) BMO Capital Markets Corp., (iii) a primary U.S. government securities dealer selected by MUFG Securities Americas Inc., (iv) a primary U.S. government securities dealer selected by Truist Securities, Inc. and (v) a primary U.S. government securities dealer selected by KKR Capital Markets LLC, or their respective affiliates which are primary U.S. government securities dealers and their respective successors; provided, however, that if any of the foregoing or their affiliates shall cease to be a primary U.S. government securities dealer in the United States, or a Primary Treasury Dealer, the Company shall select another Primary Treasury Dealer.

“Reference Treasury Dealer Quotations” means, with respect to each Reference Treasury Dealer and any Redemption Date, the average, as determined by the Quotation Agent, of the bid and asked prices for the Comparable Treasury Issue (expressed in each case as a percentage of its principal amount) quoted in writing to the Quotation Agent by such Reference Treasury Dealer at 3:30 p.m. New York City time on the third Business Day preceding such Redemption Date.

“Treasury Rate” means, with respect to any Redemption Date, the rate per annum equal to the semi-annual equivalent yield-to-maturity of the Comparable Treasury Issue (computed as of the third Business Day immediately preceding the redemption), assuming a price for the Comparable Treasury Issue (expressed as a percentage of its principal amount) equal to the Comparable Treasury Price for such Redemption Date. The Redemption Price and the Treasury Rate will be determined by the Company.

All determinations made by any Reference Treasury Dealer, including the Quotation Agent, with respect to determining the Redemption Price will be final and binding absent manifest error.

Notice of redemption shall be given in writing and mailed, first-class postage prepaid or by overnight courier guaranteeing next-day delivery, to each Holder of the Securities to be redeemed, not less than thirty (30) nor more than sixty (60) days prior to the Redemption Date, at the Holder’s address appearing in the Security Register. All notices of redemption shall contain the information set forth in Section 1104 of the Base Indenture.

Any exercise of the Company’s option to redeem the Securities will be done in compliance with the Investment Company Act, to the extent applicable.

If the Company elects to redeem only a portion of the Securities, the particular Securities to be redeemed will be selected in accordance with the applicable procedures of the Trustee and, so long as the Securities are registered to the Depositary or its nominee, the Depositary. In the event of redemption of this Security in part only, a new Security or Securities of this series and of like tenor for the unredeemed portion hereof will be issued in the name of the Holder hereof upon the cancellation hereof; provided, however, that no such partial redemption shall reduce the portion of the principal amount of a Security not redeemed to less than $2,000.

A-5

Unless the Company defaults in payment of the Redemption Price, on and after the Redemption Date, interest will cease to accrue on the Securities called for redemption.

Holders will have the right to require the Company to repurchase their Securities upon the occurrence of a Change of Control Repurchase Event as set forth in the Indenture.

The Indenture contains provisions for defeasance at any time of the entire indebtedness of this Security or certain restrictive covenants and Events of Default with respect to this Security, in each case upon compliance with certain conditions set forth in the Indenture.

If an Event of Default with respect to Securities of this series shall occur and be continuing (other than Events of Default related to certain events of bankruptcy, insolvency or reorganization as set forth in the Indenture), the principal of the Securities of this series may be declared due and payable in the manner and with the effect provided in the Indenture. In the case of certain events of bankruptcy, insolvency or reorganization described in the Indenture, 100% of the principal of and accrued and unpaid interest on the Securities will automatically become due and payable.

The Indenture permits, with certain exceptions as therein provided, the amendment thereof and the modification of the rights and obligations of the Company and the rights of the Holders of the Securities of each series to be affected under the Indenture at any time by the Company and the Trustee with the consent of the Holders of not less than a majority in principal amount of the Securities at the time Outstanding of each series to be affected. The Indenture also contains provisions permitting the Holders of specified percentages in principal amount of the Securities of each series at the time Outstanding, on behalf of the Holders of all Securities of such series, to waive compliance by the Company with certain provisions of the Indenture and certain past defaults under the Indenture and their consequences. Any such consent or waiver by the Holder of this Security shall be conclusive and binding upon such Holder and upon all future Holders of this Security and of any Security issued upon the registration of transfer hereof or in exchange herefor or in lieu hereof, whether or not notation of such consent or waiver is made upon this Security.

As provided in and subject to the provisions of the Indenture, the Holder of this Security shall not have the right to institute any proceeding with respect to the Indenture or for the appointment of a receiver or trustee or for any other remedy thereunder, unless such Holder shall have previously given the Trustee written notice of a continuing Event of Default with respect to the Securities of this series, the Holders of not less than 25% in principal amount of the Securities of this series at the time Outstanding shall have made written request to the Trustee to institute proceedings in respect of such Event of Default as Trustee and offered the Trustee indemnity, security, or both, satisfactory to the Trustee, against the costs, expenses and liabilities to be incurred in compliance with such request, and the Trustee shall not have received from the Holders of a majority in principal amount of Securities of this series at the time Outstanding a direction inconsistent with such request, and shall have failed to institute any such proceeding, for sixty (60) days after receipt of such notice, request and offer of indemnity and/or security. The foregoing shall not apply to any suit instituted by the Holder of this Security for the enforcement of any payment of principal hereof or any premium or interest hereon on or after the respective due dates expressed herein.

No reference herein to the Indenture and no provision of this Security or of the Indenture shall alter or impair the obligation of the Company, which is absolute and unconditional, to pay the principal of and any premium and interest on this Security at the times, place and rate, and in the coin or currency, herein prescribed.

As provided in the Indenture and subject to certain limitations therein set forth, the transfer of this Security is registrable in the Security Register, upon surrender of this Security for registration of transfer at the office or agency of the Company in any place where the principal of and any premium and interest on this Security are payable, duly endorsed by, or accompanied by a written instrument of transfer in form satisfactory to the Company and the Security Registrar duly executed by, the Holder hereof or his attorney duly authorized in writing, and thereupon one or more new Securities of this series and of like tenor, of authorized denominations and for the same aggregate principal amount, will be issued to the designated transferee or transferees.

The Securities of this series are issuable only in registered form without coupons in denominations of $2,000 and any integral multiples of $1,000 in excess thereof. As provided in the Indenture and subject to certain limitations therein set forth, Securities of this series are exchangeable for a like aggregate principal amount of Securities of this series and of like tenor of a different authorized denomination, as requested by the Holder surrendering the same.

A-6

No service charge shall be made for any such registration of transfer or exchange, but the Company or Trustee may require payment of a sum sufficient to cover any tax or other governmental charge payable in connection therewith.

Prior to due presentment of this Security for registration of transfer, the Company, the Trustee and any agent of the Company or the Trustee may treat the Person in whose name this Security is registered as the owner hereof for all purposes, whether or not this Security be overdue, and neither the Company, the Trustee nor any such agent shall be affected by notice to the contrary.

All terms used in this Security which are defined in the Indenture shall have the meanings assigned to them in the Indenture.

To the extent any provision of this Security conflicts with the express provisions of the Indenture, the provisions of the Indenture shall govern and be controlling.

The Indenture and this Security shall be governed by and construed in accordance with the laws of the State of New York, without regard to principles of conflicts of laws.

A-7

Exhibit 5.1

		Cira Centre 2929 Arch Street Philadelphia, PA 19104-2808 +1 215 994 4000 Main +1 215 994 2222 Fax www.dechert.com

October 12, 2021

FS KKR Capital Corp.

201 Rouse Boulevard

Philadelphia, PA 19112

Re: Registration Statement on Form N-2

Ladies and Gentlemen:

We have acted as counsel to FS KKR Capital Corp., a Maryland corporation (the “Company”), in connection with the preparation and filing of a Registration Statement on Form N-2, filed on October 4, 2021 with the U.S. Securities and Exchange Commission (the “Commission”) under the Securities Act of 1933, as amended (the “Securities Act”) (the “Registration Statement”) and the final prospectus supplement, dated October 4, 2021 (including the base prospectus filed therewith, the “Prospectus Supplement”), filed with the Commission on October 6, 2021 pursuant to Rule 424(b)(2) under the Securities Act, relating to the proposed issuance by the Company of $500,000,000 aggregate principal amount of its 1.650% notes due 2024 (the “2024 Notes”), and $750,000,000 aggregate principal amount of its 3.125% notes due 2028 (the “2028 Notes”, and together with the 2024 Notes, the “Notes”), to be sold to the underwriters pursuant to an underwriting agreement substantially in the form filed as Exhibit 1.1 to the Company’s Current Report on Form 8-K filed with the Commission on October 7, 2021 (the “Underwriting Agreement”). This opinion letter is being furnished to the Company in accordance with the requirements of Item 25 of Form N-2 under the Investment Company Act of 1940, as amended, and we express no opinion herein as to any matter other than as to the legality of the Notes.

The 2024 Notes are to be issued pursuant to the indenture dated as of July 14, 2014 (the “Base Indenture”), between the Company and U.S. Bank National Association, as trustee (the “Trustee”), as supplemented by the first supplemental indenture dated as of July 14, 2014, by the second supplemental indenture dated as of December 3, 2014, by the third supplemental indenture dated as of April 30, 2015, by the fourth supplemental indenture dated as of July 15, 2019, by the fifth supplemental indenture dated as of November 20, 2019, by the sixth supplemental indenture dated as of April 30, 2020, by the seventh supplemental indenture dated as of December 10, 2020, by the eighth supplemental indenture dated as of June 17, 2021, and the ninth supplemental indenture dated as of October 12, 2021 (the “Ninth Supplemental Indenture,” and together with the Base Indenture, the “2024 Notes Indenture”), between the Company and the Trustee.

The 2028 Notes are to be issued pursuant to the Base Indenture, as supplemented by the first supplemental indenture dated as of July 14, 2014, the second supplemental indenture dated as of December 3, 2014, the third supplemental indenture dated as of April 30, 2015, the fourth supplemental indenture dated as of July 15, 2019, the fifth supplemental indenture dated as of November 20, 2019, the sixth supplemental indenture

		FS KKR Capital Corp. October 12, 2021 Page 2

dated as of April 30, 2020, the seventh supplemental indenture dated as of December 10, 2020, the eighth supplemental indenture dated as of June 17, 2021, the Ninth Supplemental Indenture and the tenth supplemental indenture dated as of October 12, 2021 (the “Tenth Supplemental Indenture,” and together with the Base Indenture, the “2028 Notes Indenture), between the Company and the Trustee. The 2024 Notes Indenture and the 2028 Notes Indenture are referred to herein collectively as the “Indenture.”

In rendering the opinions expressed below, we have examined and relied on originals or copies, certified or otherwise identified to our satisfaction, of such documents, corporate records and other instruments and such agreements, certificates and receipts of public officials, certificates of officers or other representatives of the Company and others, and such other documents as we have deemed necessary or appropriate as a basis for the opinions set forth below, including the following documents:

As to the facts upon which this opinion is based, we have relied upon certificates of public officials and certificates and written statements of agents, officers, directors and representatives of the Company without having independently verified such factual matters.

In our examination, we have assumed the genuineness of all signatures, the authenticity of all documents submitted to us as original documents, the conformity to original documents of all documents submitted to us as copies, the legal capacity of natural persons who are signatories to the documents examined by us and the legal power and authority of all persons signing on behalf of the parties to such documents.

On the basis of the foregoing and subject to the assumptions, qualifications and limitations set forth in this letter, we are of the opinion that:

		FS KKR Capital Corp. October 12, 2021 Page 3

The opinions set forth herein are subject to the following assumptions, qualifications, limitations and exceptions being true and correct at or before the time of the Notes:

The opinions set forth herein as to enforceability of obligations of the Company are subject to: (i) bankruptcy, insolvency, reorganization, fraudulent conveyance, moratorium or similar laws now or hereinafter in effect affecting the enforcement of creditors’ rights generally, and by general principles of equity (regardless of whether enforcement is sought in a proceeding in equity or at law) and the discretion of the court or other body before which any proceeding may be brought; (ii) the unenforceability under certain circumstances under law or court decisions of provisions providing for the indemnification of, or contribution to, a party with respect to a liability where such indemnification or contribution is contrary to public policy; (iii) provisions of law which may require that a judgment for money damages rendered by a court in the United States be expressed only in U.S. dollars; (iv) requirements that a claim with respect to any debt securities denominated other than in U.S. dollars (or a judgment denominated other than in U.S. dollars in respect of such claim) be converted into U.S. dollars at a rate of exchange prevailing on a date determined pursuant to applicable law; and (v) governmental authority to limit, delay or prohibit the making of payments outside the United States or in foreign currency or composite currency.

We express no opinion as to the validity, legally binding effect or enforceability of any provision in any agreement or instrument that (i) requires or relates to payment of any interest at a rate or in an amount which a court may determine in the circumstances under applicable law to be commercially unreasonable or a penalty or forfeiture or (ii) relates to governing law and submission by the parties to the jurisdiction of one or more particular courts.

The opinions expressed herein are limited to the laws of the State of New York.

		FS KKR Capital Corp. October 12, 2021 Page 4

This opinion letter has been prepared for your use solely in connection with the Registration Statement. We assume no obligation to advise you of any changes in the foregoing subsequent to the date of this opinion.

We hereby consent to the filing of this opinion as an exhibit to the Company’s Current Report on Form 8-K filed with the Commission on October 12, 2021 and to the reference to this firm under the caption “Legal Matters” in the Registration Statement and the Prospectus Supplement. In giving such consent, we do not thereby admit that we are in the category of persons whose consent is required under Section 7 of the Securities Act or the rules and regulations of the Commission thereunder.

Very truly yours,

/s/ Dechert LLP

Exhibit 5.2

October 12, 2021

FS KKR Capital Corp.

201 Rouse Boulevard

Philadelphia, Pennsylvania 19112-1902

Re:    Registration Statement on Form N-2 (File No. 333-260000)

Ladies and Gentlemen:

We have acted as special Maryland counsel to FS KKR Capital Corp., a Maryland corporation (the “Company”) and a business development company under the Investment Company Act of 1940, as amended, in connection with the issuance and sale of (i) $500,000,000 aggregate principal amount of its 1.650% Notes due 2024 (the “2024 Notes”), and (ii) $750,000,000 aggregate principal amount of its 3.125% Notes due 2028 (the “2028 Notes” and, together with the 2024 Notes, the “Notes”), as covered by the Company’s Registration Statement on Form N-2 (File No. 333-260000) (the “Registration Statement”), filed with the Securities and Exchange Commission (the “Commission”) under the Securities Act of 1933, as amended (the “Securities Act”).

We have examined (i) the Registration Statement, except that we have not examined the documents incorporated by reference therein or otherwise deemed to be part thereof or included therein, (ii) the Underwriting Agreement, dated October 4, 2021 (the “Underwriting Agreement”), among the Company, FS/KKR Advisor, LLC, a Delaware limited liability company, BofA Securities, Inc., BMO Capital Markets Corp., KKR Capital Markets LLC, MUFG Securities Americas Inc., and Truist Securities, Inc., as representatives of the underwriters named therein, pursuant to which the Notes are being issued and sold, (iii) the Indenture, dated as of July 14, 2014, between the Company and U.S. Bank National Association, as Trustee (the “Trustee”), together with the Ninth Supplemental Indenture thereto, dated as of October 12, 2021, and the Tenth Supplemental Indenture thereto, dated as of October 12, 2021, between the Company and the Trustee (collectively, the “Indenture”); (iv) the charter and the bylaws of the Company, (v) certain records of proceedings of the board of directors of the Company with respect to the issuance and sale of the Notes and the transactions contemplated by the Underwriting Agreement, and (vi) such other corporate records, certificates and documents as we deemed necessary for the purpose of this opinion letter. In giving the opinions set forth herein, we have made the following assumptions: (i) all documents submitted to us as originals are authentic, (ii) all documents submitted to us as copies conform to the original documents, (iii) all signatures on all documents submitted to us for examination are genuine, (iv) all natural persons who executed any of the documents that were reviewed by us had legal capacity at the time of such execution and (v) all public records reviewed by us or on our behalf are accurate and complete.

100 Light Street  |  Baltimore, MD 21202  |  410.727.6464  |  milesstockbridge.com

EASTON, MD ● FREDERICK, MD ● RICHMOND, VA ● ROCKVILLE, MD ● TYSONS CORNER, VA ● WASHINGTON, D.C.

FS KKR Capital Corp. October 12, 2021 Page 2

We have relied as to certain factual matters on information obtained from public officials and from officers of the Company. Based on that examination, it is our opinion that the Company has the corporate power to execute, deliver and perform its obligations under the Indenture and to issue the Notes and that the execution and delivery by the Company of the Indenture, the performance of its obligations thereunder and the issuance of the Notes have been duly authorized by the Company.

We express no opinion as to the laws of any state or jurisdiction other than, and our opinions expressed herein are limited to, the laws of the State of Maryland, except that we express no opinion with respect to the “blue sky” or other securities laws or regulations of the State of Maryland or any other jurisdiction. The opinions expressed herein are limited to the matters set forth in this letter and no other opinion should be inferred beyond the matters expressly stated. This letter and the opinions expressed herein are being furnished by us to you solely for your benefit and may not be relied on, used, circulated, quoted from or otherwise referred to by any other person or for any other purpose without our prior written consent.

We hereby consent to the filing of this opinion as an exhibit to the Company’s Current Report on Form 8-K filed with the Commission on October 12, 2021 and to the use of our name under the caption “Legal Matters” in the prospectus forming a part of the Registration Statement. In giving our consent, we do not thereby admit that we are in the category of persons whose consent is required under Section 7 of the Securities Act or the rules and regulations of the Commission thereunder.

Exhibit 99.1

FOR IMMEDIATE RELEASE

FSK Completes Offering of $500,000,000 1.650% Notes Due 2024 and $750,000,000 3.125% Notes Due 2028

and Announces the Redemption of all of its 5.00% Senior Notes Due 2022

PHILADELPHIA, PA, October 12, 2021 – FS KKR Capital Corp. (“FSK”) today announced that it has completed its previously announced offering (the “Offering”) of $500,000,000 in aggregate principal amount of its 1.650% unsecured notes due 2024 (the “2024 Notes”) and $750,000,000 in aggregate principal amount of its 3.125% unsecured notes due 2028 (the “2028 Notes,” and together with the 2024 Notes, the “Notes”). BofA Securities, Inc., BMO Capital Markets Corp., KKR Capital Markets LLC, MUFG Securities Americas Inc., Truist Securities, Inc., ING Financial Markets LLC, J.P. Morgan Securities LLC, SMBC Nikko Securities America, Inc., HSBC Securities (USA) Inc. and Mizuho Securities USA LLC are acting as joint book-running managers for this offering. RBC Capital Markets, LLC, BNP Paribas Securities Corp., Citigroup Global Markets Inc., Deutsche Bank Securities Inc., Goldman Sachs & Co. LLC, Morgan Stanley & Co. LLC, Santander Investment Securities Inc. and SG Americas Securities, LLC are acting as joint lead managers for this offering. Barclays Capital Inc., Credit Suisse Securities (USA) LLC, Compass Point Research & Trading, LLC, ICBC Standard Bank Plc, R. Seelaus & Co., LLC, Keefe, Bruyette & Woods, Inc. and U.S. Bancorp Investments, Inc. are acting as co-managers for this offering.

On October 12, 2021, FSK issued a notice of redemption providing for the redemption of its 5.00% senior notes due 2022 (the “2022 Notes”) in full on November 11, 2021 (the “Redemption Date”) for 100% of the aggregate principal amount of the 2022 Notes, plus the accrued and unpaid interest through, but excluding, the Redemption Date (the “Redemption”). All of the 2022 Notes will be redeemed in connection with the Redemption.

FSK expects to use a portion of the net proceeds of the Offering to fund the Redemption, including the payment of all accrued interest and costs and expenses in connection with the Redemption. The remainder of the net proceeds from the Offering will be used to repay outstanding indebtedness under FSK’s financing arrangements.

This announcement does not constitute an offer to sell or a solicitation of an offer to buy any of the Notes, nor shall there be any offer, solicitation or sale in any state or jurisdiction in which such an offer, solicitation or sale would be unlawful.

About FS KKR Capital Corp.

FS KKR Capital Corp. (NYSE: FSK) is a leading publicly traded business development company (BDC) focused on providing customized credit solutions to private middle market U.S. companies. FSK seeks to invest primarily in the senior secured debt and, to a lesser extent, the subordinated debt of private middle market companies. FSK is advised by FS/KKR Advisor, LLC.

About FS/KKR Advisor, LLC

FS/KKR Advisor, LLC (FS/KKR) is a partnership between FS Investments and KKR Credit that serves as the investment adviser to FSK.

FS Investments is a leading asset manager dedicated to helping individuals, financial professionals and institutions design better portfolios. The firm provides access to alternative sources of income and growth, and focuses on setting industry standards for investor protection, education and transparency. FS Investments is headquartered in Philadelphia, PA with offices in New York, NY, Orlando, FL and Leawood, KS.

KKR Credit is a subsidiary of KKR & Co. Inc., a leading global investment firm that manages multiple alternative asset classes, including private equity, credit and real assets, with strategic manager partnerships that manage hedge funds. KKR aims to generate attractive investment returns for its fund investors by following a patient and disciplined investment approach, employing world-class people, and driving growth and value creation with KKR portfolio companies. KKR invests its own capital alongside the capital it manages for fund investors and provides financing solutions and investment opportunities through its capital markets business. References to KKR’s investments may include the activities of its sponsored funds.

Forward-Looking Statements and Important Disclosure Notice

This announcement may contain certain forward-looking statements, including statements with regard to future events or the future performance or operations of FSK. Words such as “believes,” “expects,” “projects,” and “future” or similar expressions are intended to identify forward-looking statements. These forward-looking statements are subject to the inherent uncertainties in predicting future results and conditions. Certain factors could cause actual results to differ materially from those projected in these forward-looking statements. Factors that could cause actual results to differ materially include changes in the economy, risks associated with possible disruption in FSK’s operations or the economy generally due to terrorism, natural disasters or pandemics such as COVID-19, future changes in laws or regulations and conditions in FSK’s operating area, and the price at which shares of FSK’s common stock trade on the New York Stock Exchange. Some of these factors are enumerated in the filings FSK makes with the SEC. FSK undertakes no obligation to update or revise any forward-looking statements, whether as a result of new information, future events or otherwise.

Contact Information:

Investor Relations Contact

Robert Paun

Robert.Paun@fsinvestments.com

917-338-5074

Media Contact

Melanie Hemmert

Melanie.Hemmert@fsinvestments.com