Sixth Street Specialty (NYSE: TSLX) VP adds 2,840 shares

Rhea-AI Filing Summary

Sixth Street Specialty Lending, Inc. vice president Joshua Peck reported an open-market purchase of the company’s common stock. On March 2, 2026, he bought 2,840 shares at a price of $17.59 per share.

Following this transaction, Peck directly owns 3,140 shares of Sixth Street Specialty Lending common stock, reflecting increased personal exposure to the company’s equity.

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^*

Peck Joshua

(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)
03/02/2026

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	03/02/2026		P		2,840	A	$17.59	3,140	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 Joshua Peck 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 (1)	03/03/2026
	** 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 vice president Joshua Peck report?

Joshua Peck reported buying 2,840 shares of Sixth Street Specialty Lending common stock in an open-market transaction. The shares were purchased on March 2, 2026 at a price of $17.59 per share, increasing his direct equity stake in the company.

How many TSLX shares does Joshua Peck own after this Form 4 filing?

After the reported trade, Joshua Peck directly owns 3,140 shares of Sixth Street Specialty Lending common stock. This reflects his previously held shares plus the 2,840 shares purchased on March 2, 2026 in the open market at $17.59 per share.

Was the TSLX insider transaction by Joshua Peck a purchase or sale?

The transaction was a purchase of Sixth Street Specialty Lending common stock by Joshua Peck. It was classified as an open-market or private transaction under code “P,” indicating he bought 2,840 shares at $17.59 per share and increased his direct holdings.

What price did TSLX vice president Joshua Peck pay per share?

Joshua Peck paid $17.59 per share for Sixth Street Specialty Lending common stock. The Form 4 shows an open-market purchase of 2,840 shares at this price on March 2, 2026, resulting in total direct ownership of 3,140 shares after the transaction.

Does Joshua Peck hold his TSLX shares directly or indirectly?

Joshua Peck holds his Sixth Street Specialty Lending shares directly, according to the Form 4. The filing classifies his ownership as “direct,” with no referenced intermediary entities, and shows 3,140 common shares owned following the March 2, 2026 open-market purchase.