TSLX

Sixth Street Specialty Lending Advisers, LLC ("Advisers") directly holds 2,716,977 shares of common stock, $0.01 par value per share (the "Common Stock") of Sixth Street Specialty Lending, Inc. (the "Issuer"), including shares of Common Stock indirectly beneficially owned by the Reporting Person (through his limited partnership interest in TSL Equity Partners, L.P. ("TSL"), which is a member of Sixth Street Specialty Lending Advisers Holdings, LLC, which in turn is a member of Advisers). This transaction reflects the acquisition by a trust for the benefit of certain of the Reporting Person's family members of limited partnership interests in TSL from an existing limited partner. The number of shares of Issuer Common Stock reported as acquired reflects the Reporting Person's indirect beneficial ownership in the shares acquired through such limited partnership interest in TSL. In connection with the acquisition by the trust, the trust paid the transferors an aggregate of $344,200.

Includes Reporting Person's indirect beneficial ownership of 3,907.27 Shares of the Issuer that Reporting Person previously reported as directly owned. Shares are held directly by Advisers.

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.

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.

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 $18.32 to $18.35, inclusive. The 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.

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.

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.

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 $17.640 to $17.665, inclusive. The 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.

The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $17.49 to $17.95, inclusive. The reporting person undertakes to provide upon request, full information regarding the number of shares purchased at each separate price within the range set forth above.

Includes shares issued pursuant to the Issuer's dividend reinvestment plan as of the date of this filing.

Includes shares issued pursuant to the Issuer's dividend reinvestment plan as of the date of this filing.

Includes shares issued pursuant to the Issuer's dividend reinvestment plan as of the date of this filing.

Includes shares issued pursuant to the Issuer's dividend reinvestment plan as of the date of this filing.

The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $21.44 to $21.58, inclusive. The 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.

Includes 3,264 shares of Common Stock acquired under the Sixth Street Specialty Lending, Inc. dividend reinvestment plan since August 25, 2020.

The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $19.025 to $19.05, inclusive. The reporting person undertakes to provide upon request, full information regarding the number of shares purchased at each separate price within the range set forth above.

Includes 2,025.1 shares of Common Stock acquired under the Sixth Street Specialty Lending, Inc. dividend reinvestment plan since March 5, 2018.

The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $20.986 to $20.993, inclusive. The 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 sold at each separate price within the range set forth above.

Includes 1,835.1 shares of Common Stock acquired under the Sixth Street Specialty Lending, Inc. dividend reinvestment plan since March 5, 2018.

The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $22.64 to $23.00 inclusive. The 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.

Shares purchased for the account of a family member, over which Mr. Higginbotham has investment discretion.

The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $21.85 to $21.92 inclusive. The 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.

Shares held through a trust for which a member of Mr. Higginbotham's immediate family sharing the same household is the trustee. Mr. Higginbotham disclaims beneficial ownership of these securities, and the filing of this report is not an admission that Mr. Higginbotham is the beneficial owner of these securities for purposes of Section 16 or for any other purpose.

Sixth Street Specialty Lending Advisers, LLC ("Sixth Street Specialty Lending Advisers") directly holds 2,716,977 shares of Common Stock of Sixth Street Specialty Lending, Inc. (the "Issuer"), including 18,791.75 shares of Common Stock of the Issuer indirectly beneficially owned by Mr. Easterly (through his limited partnership interest in TSL Equity Partners, L.P., which is a member of Sixth Street Specialty Lending Advisers Holdings, LLC, which in turn is a member of Sixth Street Specialty Lending Advisers).

Sixth Street Specialty Lending Advisers, LLC ("Sixth Street Specialty Lending Advisers") directly holds 2,716,977 shares of Common Stock of Sixth Street Specialty Lending, Inc. (the "Issuer"), including 10,430.77 shares of Common Stock of the Issuer indirectly beneficially owned by Mr. Easterly (through his limited partnership interest in TSL Equity Partners, L.P., which is a member of Sixth Street Specialty Lending Advisers Holdings, LLC, which in turn is a member of Sixth Street Specialty Lending Advisers).

Held through a trust for which a member of Mr. Doddy's immediate family sharing the same household is the trustee. Mr. Doddy disclaims beneficial ownership of these securities, and the filing of this report is not an admission that Mr. Doddy is the beneficial owner of these securities for purposes of Section 16 or for any other purpose.

The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $18.405 to $18.4828 inclusive. The 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.

Held through a trust for which a member of Mr. Doddy's immediate family sharing the same household is the trustee. Mr. Doddy disclaims beneficial ownership of these securities, and the filing of this report is not an admission that Mr. Doddy is the beneficial owner of these securities for purposes of Section 16 or for any other purpose.

Includes 239.7096 shares of Common Stock acquired under the TPG Specialty Lending, Inc. dividend reinvestment plan since January 31, 2019.

Includes 338 shares of Common Stock acquired under the TPG Specialty Lending, Inc. dividend reinvestment plan since August 15, 2019.

The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $19.19 to $19.69 inclusive. The reporting person undertakes to provide to TPG 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.

The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $19.19 to $19.69 inclusive. The reporting person undertakes to provide to TPG 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.

The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $21.49 to $21.56, inclusive. The reporting person undertakes to provide to TPG 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.