Sec Form 4 Filing - GROSS MICHAEL S @ SLR Senior Investment Corp. - 2022-04-01

FORM 4 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person GROSS MICHAEL S 2. Issuer Name and Ticker or Trading Symbol SLR Senior Investment Corp. [ SUNS] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) X __ Director _____ 10% Owner X __ Officer (give title below) _____ Other (specify below) See Remarks (Last) (First) (Middle) C/O SLR SENIOR INVESTMENT CORP.,, 500 PARK AVENUE 3. Date of Earliest Transaction (MM/DD/YY) 04/01/2022 (Street) NEW YORK, NY10022 4. If Amendment, Date Original Filed (MM/DD/YY) 6. Individual or Joint/Group Filing (Check Applicable Line) __ X __ Form filed by One Reporting Person _____ Form filed by More than One Reporting Person (City) (State) (Zip)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned 1.Title of Security (Instr. 3) 2. Transaction Date (MM/DD/YY) 2A. Deemed Execution Date, if any (MM/DD/YY) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price Common Stock 04/01/2022 D 616,281( 1 ) D 0 I See Footnotes( 2 )( 3 )( 4 ) Common Stock 04/01/2022 D 288,841( 1 ) D 0 D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities) 1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (MM/DD/YY) 3A. Deemed Execution Date, if any (MM/DD/YY) 4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4, and 5) 6. Date Exercisable and Expiration Date (MM/DD/YY) 7. Title and Amount of Underlying Securities (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4) Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares Restricted Stock Units ( 6 ) 04/01/2022 A 100,373.9998 ( 6 ) ( 6 )( 7 ) Common Stock 100,373.9998 ( 6 ) 0 I See Footnote( 6 )

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other GROSS MICHAEL S C/O SLR SENIOR INVESTMENT CORP., 500 PARK AVENUE NEW YORK, NY10022 X See Remarks Signatures /s/ Michael S. Gross 04/05/2022 Signature of Reporting Person Date

Explanation of Responses:

( 1 )Disposed of pursuant to the Agreement and Plan of Merger, dated as of December 1, 2021 (the "Merger Agreement"), by and among SLR Investment Corp. ("SLRC"), SLR Senior Investment Corp. ("SUNS"), Solstice Merger Sub, Inc. and SLR Capital Partners, LLC ("SLR Capital Partners") (for the limited purposes set forth therein), in exchange for 480,448 shares of common stock, par value $0.01 per share, of SLRC. Pursuant to the Merger Agreement, each share of SUNS's common stock, par value $0.01 per share, was converted into the right to receive 0.7796 shares of SLRC's common stock (the "Mergers"). The disposition reported in this Form 4 is an exempt transaction. ( 2 )Prior to the Mergers, the indirect ownership included 87,874 shares of the Issuer held by Solar Capital Partners Employee Stock Plan, LLC (the "SCP Plan"). The SCP Plan is controlled by SLR Capital Partners. Michael S. Gross and Bruce J. Spohler may have been deemed to indirectly beneficially own a portion of the shares held by the SCP Plan prior to the effective date of the Mergers by virtue of their collective ownership interest in SLR Capital Partners. ( 3 )(Continued from Footnote (2)) In addition, the total included 455,500 shares of the Issuer held by Solar Senior Capital Investors, LLC ("Solar Senior Investors") and 100 shares of the Issuer held by SLR Capital Management, LLC prior to the effective date of the Mergers, a portion of both of which may have been deemed to be indirectly beneficially owned by Messrs. Spohler and Gross by virtue of their collective ownership interest therein. The total also included 11,344 shares of the Issuer held by certain trusts for the benefit of family members for which Mr. Gross serves as trustee (the "Family Trusts"). ( 4 )(Continued from Footnote (3)) Furthermore, the total included 61,463 shares of the Issuer directly held by Mr. Gross' profit sharing plan (the "Profit Sharing Plan") prior to the effective date of the Mergers. Mr. Gross may have been deemed to directly beneficially own these shares as the sole participant in the Profit Sharing Plan. Prior to the effective date of the Mergers, Mr. Gross disclaimed beneficial ownership of any of the Issuer's securities directly held by the SCP Plan, Solar Senior Investors or SLR Management, except to the extent of his pecuniary interest therein, and this report shall not be deemed an admission that Mr. Gross was, prior to the effective date of the Mergers, the beneficial owner of such securities for purposes of Section 16 or any other purpose. ( 5 )Disposed of pursuant to the Merger Agreement in exchange for 225,180 shares of common stock, par value $0.01 per share, of SLRC. Pursuant to the Merger Agreement, each share of SUNS's common stock, par value $0.01 per share, was converted into the right to receive 0.7796 shares of SLRC's common stock. The disposition reported in this Form 4 is an exempt transaction. ( 6 )Restricted stock units ("RSUs") with respect to 100,373.9998 shares held by the SCP Plan granted to certain of SLR Capital Partners's employees on March 5, 2019, March 9, 2020 and March 2, 2021 were outstanding prior to the Mergers. RSUs may have been settled in shares of the Issuer's common stock or the cash value thereof on a one-for-one basis at the election of the SCP Plan administrators, Messrs. Gross and Spohler. Pursuant to the employee compensation plan, the administrators elected to amend the outstanding awards in connection with the Mergers to reference 78,251.5702 shares of SLRC. Messrs. Gross and Spohler may be deemed to beneficially own the shares held by the SCP Plan by virtue of their collective ownership interest in SLR Capital Partners. Each grant of RSUs was scheduled to vest 50% on each of the second and third anniversary of grant, subject to the restrictions in the plan. ( 7 )Pursuant to the SEC staff no-action letters to Carlyle GMS Finance, Inc. (pub. Avail. Oct. 8, 2015) and to Babson Capital Management LLC (pub. Avail. Dec. 14, 2006), an employee benefit plan sponsored by an investment adviser (or an affiliated person of an investment adviser) to a closed-end investment company that has elected to be regulated as a business development company or to a closed-end investment company registered under the Investment Company Act of 1940, as amended, respectively, in either case that offers plan participants equity securities of such investment company is considered an "employee benefit plan sponsored by the issuer" for the purposes of Rule 16b-3 under the Securities Exchange Act of 1934, as amended.

Remarks: Co-Chief Executive Officer, President, Chairman of the Board

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