Sixth Street Specialty Lending (TSLX) VP reports 300,000-share open-market buy

Rhea-AI Filing Summary

Sixth Street Specialty Lending, Inc. Vice President Alan Waxman reported indirect open-market purchases of a total of 300,000 shares of common stock through a trust. On March 6, 2026, the trust bought 200,000 shares at a weighted average price of $18.42 per share, and on March 5, 2026, it bought 100,000 shares at a weighted average price of $18.46 per share.

After these transactions, the trust held 300,000 shares. A separate holding line shows an indirect interest in 2,714,266 shares held by Sixth Street Specialty Lending Advisers, LLC, an entity managed through a structure in which Waxman serves as CEO of the top-level manager.

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)
03/05/2026

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	03/05/2026		P		100,000	A	$18.46(1)	100,000	I	By Trust
Common Stock	03/06/2026		P		200,000	A	$18.42(2)	300,000	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 $18.38 to $18.525, 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 $18.28 to $18.635, 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. Reporting Person previously reported his indirect pecuniary interest in 140,447.01 Shares. 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, which is attached hereto as an exhibit. Exhibit List: Exhibit 24 Power of Attorney

	/s/ Anton Brett, attorney-in fact (A)	03/09/2026
	** 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

How many Sixth Street Specialty Lending (TSLX) shares were bought in this Form 4?

The Form 4 reports indirect open-market purchases totaling 300,000 shares of Sixth Street Specialty Lending common stock. A trust associated with Vice President Alan Waxman bought 200,000 shares on March 6, 2026 and 100,000 shares on March 5, 2026.

At what prices were the TSLX shares purchased in Alan Waxman’s Form 4?

The reported prices are weighted averages of $18.42 for 200,000 shares and $18.46 for 100,000 shares. Footnotes state actual trades occurred in multiple transactions within narrow ranges around each weighted average price.

Are Alan Waxman’s TSLX share purchases held directly or indirectly?

The 300,000 purchased shares are held indirectly by a trust, as shown by the “By Trust” nature of ownership. The filing classifies these as indirect holdings rather than shares owned directly in Waxman’s personal name.

What is the total indirect TSLX interest reported through Sixth Street Specialty Lending Advisers, LLC?

The Form 4 notes a previously reported indirect pecuniary interest in 2,714,266 shares held by Sixth Street Specialty Lending Advisers, LLC. That adviser entity is managed through a holding structure whose top-level manager’s board currently includes Waxman as CEO.

What transaction code is used in Alan Waxman’s TSLX Form 4 trades?

The share purchases use transaction code P, described as a purchase in an open market or private transaction. This indicates these were buy transactions rather than option exercises, gifts, or other non-purchase related insider movements.