Sixth Street Specialty Lending insider purchase of 10,000 TSLX shares

Rhea-AI Filing Summary

Sixth Street Specialty Lending, Inc. (TSLX) reported an insider share purchase by Co-CEO and director Robert J. Stanley. On 11/18/2025, he acquired 10,000 shares of common stock in an open market purchase at a price of $20.85 per share, as shown by transaction code "P" for a purchase. Following this transaction, he beneficially owns 24,907.27 shares of TSLX common stock in direct ownership form. The Form 4 is filed for one reporting person, and the signature is provided by Anton Brett under a power of attorney dated November 18, 2025.

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^*

Stanley Robert J.

(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)

X	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	Co-CEO

3. Date of Earliest Transaction (Month/Day/Year)
11/18/2025

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	11/18/2025		P		10,000	A	$20.85	24,907.27	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 (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:

Remarks:

(1) Anton Brett is signing on behalf of Robert J. Stanley pursuant to a Power of Attorney dated November 18, 2025, which is attached hereto as an exhibit. Exhibit List Exhibit 24- Power of Attorney

	/s/ Anton Brett, on behalf of Robert J. Stanley (1)	11/20/2025
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.

FAQ

What insider transaction did TSLX report in this Form 4?

The filing reports that Robert J. Stanley, Co-CEO and director of Sixth Street Specialty Lending, Inc. (TSLX), purchased 10,000 shares of common stock on 11/18/2025.

At what price did the TSLX insider buy shares?

Robert J. Stanley bought the 10,000 TSLX common shares at a price of $20.85 per share in an open market purchase.

How many TSLX shares does the insider own after this transaction?

After the reported purchase, Robert J. Stanley beneficially owns 24,907.27 shares of Sixth Street Specialty Lending, Inc. common stock.

What is Robert J. Stanley’s role at Sixth Street Specialty Lending, Inc. (TSLX)?

Robert J. Stanley is reported as both a director and an officer (Co-CEO) of Sixth Street Specialty Lending, Inc.

Was this TSLX Form 4 filed for multiple insiders or one person?

The Form 4 indicates it is filed by one reporting person, covering the transactions of Robert J. Stanley only.

Who signed the TSLX Form 4 on behalf of the reporting person?

The Form 4 is signed by /s/ Anton Brett on behalf of Robert J. Stanley, pursuant to a Power of Attorney dated November 18, 2025.