Alan Waxman - 09 Mar 2026 Form 4 Insider Report for Sixth Street Specialty Lending, Inc. (TSLX)

Reporting relationship: Vice President
Issuer ticker: TSLX
Reported as of: 09 Mar 2026
Net transaction value: +$4,467,150
SEC form: 4
Accepted by SEC: 11 Mar 2026, 16:20:53 UTC
Prior SEC filing: 09 Mar 2026
Next SEC filing: 25 Jun 2026
Source filing: View source filing
Reporting owner signature: /s/ Anton Brett, attorney-in fact (A)

Key filing fact

Alan Waxman filed Form 4 for Sixth Street Specialty Lending, Inc. (TSLX) on 11 Mar 2026.

Key facts

This page summarizes Alan Waxman's Form 4 filing for Sixth Street Specialty Lending, Inc. (TSLX).
2 reported transactions and 0 derivative rows are listed below.
Accepted by SEC: 11 Mar 2026, 16:20.

Change

Previous filing in this sequence was filed on 09 Mar 2026.
Current net transaction value: +$4,467,150.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (1)

CIK 0001515132 Primary reporting owner

Waxman Alan

Relationship: Vice President
Address: C/O SIXTH STREET SPECIALTY LENDING, INC., 2100 MCKINNEY AVENUE, SUITE 1500, DALLAS
Signature: /s/ Anton Brett, attorney-in fact (A)
Signature date: 11 Mar 2026

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

TSLX transaction

Common Stock

Purchase

Transaction value: $3,636,000
Shares: +200,000
Change %: +67%
Price: $18.18
Shares after: 500,000
Date: 09 Mar 2026
Ownership: By Trust
Footnotes: F1

TSLX transaction

Common Stock

Purchase

Transaction value: $831,150
Shares: +45,000
Change %: +9%
Price: $18.47
Shares after: 545,000
Date: 10 Mar 2026
Ownership: By Trust
Footnotes: F2

TSLX holding

Common Stock

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 2,714,266
Date: 09 Mar 2026
Ownership: See Footnote
Footnotes: F3

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 3 footnotes

Footnote F1

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.

Footnote F2

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.

Footnote F3

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.

SEC 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.