Sixth Street Specialty Lending, Inc. (NYSE: TSLX, or the “Company”) today reported financial results for the full year and fourth quarter ended December 31, 2025. Please view a printable version of the2025 Full Year and Fourth Quarter Results

Conference Call Information:

A conference call to discuss the Company’s financial results will be held at 8:30 a.m. Eastern Time on February 13, 2026. The conference call will be broadcast live in listen-only mode on the Investor Resources section of TSLX’s website athttps://sixthstreetspecialtylending.gcs-web.com/events-and-presentations

Research analysts who wish to participate in the conference call must first register athttps://register-conf.media-server.com/register/BI8fd4599053f14d4783d578bde7c7c0be

Replay Information:

A recorded version will be available under the same webcast link (https://sixthstreetspecialtylending.gcs-web.com/events-and-presentations

Please direct any questions regarding the conference call to TSLX Investor Relations,IRTSLX@sixthstreet.com

About Sixth Street Specialty Lending

Sixth Street Specialty Lending is a specialty finance company focused on lending to middle-market companies. The Company seeks to generate current income primarily in U.S.-domiciled middle-market companies through direct originations of senior secured loans and, to a lesser extent, originations of mezzanine loans and investments in corporate bonds and equity securities. The Company has elected to be regulated as a business development company, or a BDC, under the Investment Company Act of 1940 and the rules and regulations promulgated thereunder. The Company is externally managed by Sixth Street Specialty Lending Advisers, LLC, an affiliate of Sixth Street and a Securities and Exchange Commission (“SEC”) registered investment adviser. The Company leverages the deep investment, sector, and operating resources of Sixth Street, a global investment firm with over $125 billion in assets under management and committed capital. For more information, visit the Company’s website athttps://sixthstreetspecialtylending.com

About Sixth Street

Sixth Street is a global investment firm with over $125 billion in assets under management and committed capital. The firm uses its long-term flexible capital, data-enabled capabilities, and One Team culture to develop themes and offer solutions to companies across all stages of growth. Founded in 2009, Sixth Street has more than 740 team members including over 300 investment professionals around the world. For more information, visithttps://sixthstreet.com

Forward-Looking Statements

Statements included herein may constitute “forward-looking statements,” within the meaning of the federal securities laws and the Private Securities Litigation Reform Act of 1995, which relate to future events or the Company’s future performance or financial condition. These forward-looking statements can be identified by the use of forward-looking terminology, such as “outlook,” “indicator,” “believes,” “expects,” “potential,” “continues,” “may,” “can,” “will,” “should,” “seeks,” “approximately,” “predicts,” “intends,” “plans,” “estimates,” “anticipates”, “confident,” “conviction,” “identified” or the negative versions of these words or other comparable words thereof. These statements are not guarantees of future performance, conditions or results and involve a number of risks and uncertainties. Actual results may differ materially from those in the forward-looking statements as a result of a number of factors, including those described from time to time in the Company’s filings with the SEC, which are accessible on the SEC’s website atwww.sec.gov

Non-GAAP Financial Measures

Adjusted net investment income and adjusted net income are each non-GAAP financial measures, which represent net investment income and net income, respectively, in each case less the impact of accrued capital gains incentive fee expenses. The Company believes that adjusted net investment income and adjusted net income provide useful information to investors regarding the fundamental earnings power of the business, and these figures are used by the Company to measure its financial condition and results of operations. The presentation of this additional information is not meant to be considered in isolation or as a substitute for financial results prepared in accordance with GAAP.

View source version on businesswire.com:https://www.businesswire.com/news/home/20260212263909/en/