Alan Waxman (TSLX) adds 245,000 indirect shares in open-market buys

Rhea-AI Filing Summary

Sixth Street Specialty Lending, Inc. insider Alan Waxman, a Vice President, reported significant open-market purchases of the company’s common stock through an indirect trust ownership. On March 9, the trust bought 200,000 shares at a weighted average price of $18.18 per share, followed by another 45,000 shares on March 10 at a weighted average price of $18.47 per share.

After these transactions, the trust’s holdings increased to 545,000 shares of common stock. A separate indirect holding of 2,714,266 shares is reported as being held by Sixth Street Specialty Lending Advisers, LLC, an entity managed through a chain of holding companies whose board currently includes Waxman as CEO.

SEC Form 4

FORM 4

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
or Section 30(h) of the Investment Company Act of 1940

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

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Waxman Alan

(Last) (First) (Middle)

C/O SIXTH STREET SPECIALTY LENDING, INC.

2100 MCKINNEY AVENUE, SUITE 1500

(Street)

DALLAS TX 75201

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
Sixth Street Specialty Lending, Inc. [ TSLX ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	Vice President

3. Date of Earliest Transaction (Month/Day/Year)
03/09/2026

4. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	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	03/09/2026		P		200,000	A	$18.18(1)	500,000	I	By Trust
Common Stock	03/10/2026		P		45,000	A	$18.47(2)	545,000	I	By Trust
Common Stock								2,714,266	I	See Footnote(3)

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 (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	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 (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (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: 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

Explanation of Responses:

1. The price reported in Column 4 is a weighted average price. These shares of common stock, par value $0.01 per share (the "Shares") were purchased in multiple transactions at prices ranging from $17.865 to $18.445, inclusive. Mr. Waxman ("Reporting Person") undertakes to provide to Sixth Street Specialty Lending, Inc. (the "Issuer"), any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of Shares purchased at each separate price within the range set forth above.

2. The price reported in Column 4 is a weighted average price. These Shares were purchased in multiple transactions at prices ranging from $18.27 to $18.57, inclusive. Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of Shares purchased at each separate price within the range set forth above.

3. Shares are held directly by Sixth Street Specialty Lending Advisers, LLC ("Adviser"). Adviser is managed by Sixth Street Specialty Lending Advisers Holdings, LLC, the sole member of Adviser. Sixth Street Specialty Lending Advisers Holdings, LLC is managed by TSSP Holdco Management, LLC, which is managed by a board of directors, which is currently comprised of Reporting Person. Reporting Person is the CEO of TSSP Holdco Management, LLC.

Remarks:

Reporting Person disclaims beneficial ownership of these Shares, except to the extent of his pecuniary interest therein, and, pursuant to Rule 16a-1(a)(4) under the Securities Exchange Act of 1934, Reporting Person states that the inclusion of these securities in this report shall not be deemed an admission of beneficial ownership of all of the reported securities for purposes of Section 16 or for any other purpose. (A) Anton Brett is signing on behalf of Mr. Waxman pursuant to a Power of Attorney dated March 2, 2026.

	/s/ Anton Brett, attorney-in fact (A)	03/11/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
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FAQ

What insider transactions did TSLX Vice President Alan Waxman report?

Alan Waxman reported indirect open-market purchases of Sixth Street Specialty Lending common stock. A trust associated with him bought 200,000 shares at $18.18 and 45,000 shares at $18.47, increasing that trust’s holdings to 545,000 shares, according to the Form 4 data.

How many TSLX shares did the trust associated with Alan Waxman buy?

The trust associated with Alan Waxman bought a total of 245,000 Sixth Street Specialty Lending shares. This included 200,000 shares on March 9 at $18.18 and 45,000 shares on March 10 at $18.47, boosting the trust’s indirect stake to 545,000 shares.

What prices did Alan Waxman’s trust pay for TSLX shares?

The Form 4 reports weighted average purchase prices for the trust’s TSLX buys. On March 9, it paid $18.18 per share, and on March 10, $18.47 per share. Footnotes note each day’s trades occurred in multiple transactions within specified intraday price ranges.

How many Sixth Street Specialty Lending shares does Alan Waxman indirectly hold after these trades?

After these trades, Waxman is reported as indirectly holding 545,000 shares through a trust. Separately, 2,714,266 shares are reported as held by Sixth Street Specialty Lending Advisers, LLC, an entity managed through intermediary holding companies whose board currently includes Waxman as CEO.

Were Alan Waxman’s TSLX share purchases made in the open market?

Yes. The transactions are coded as open-market purchases of common stock. The Form 4 notes they were executed at weighted average prices, with underlying trades occurring across price ranges specified in the footnotes for March 9 and March 10, 2026.

Who legally holds the large indirect TSLX position linked to Alan Waxman?

The large indirect TSLX position is held by Sixth Street Specialty Lending Advisers, LLC. Footnotes explain this adviser entity is managed through a chain of holding companies overseen by a board of directors currently comprised of Waxman, who serves as CEO of TSSP Holdco Management, LLC.