Sixth Street Specialty Lending Inc

To the Stockholders and Board of Directors

Sixth Street Specialty Lending, Inc.:

Opinions on the Consolidated Financial Statements and Internal Control Over Financial Reporting

We have audited the accompanying consolidated balance sheets of Sixth Street Specialty Lending, Inc. and subsidiaries (the Company), including the consolidated schedules of investments, as of December 31, 2023 and 2022, the related consolidated statements of operations, changes in net assets, and cash flows for each of the years in the three-year period ended December 31, 2023, and the related notes (collectively, the consolidated financial statements). We also have audited the Company’s internal control over financial reporting as of December 31, 2023, based on criteria established in Internal Control – Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission.

In our opinion, the consolidated financial statements referred to above present fairly, in all material respects, the financial position of the Company as of December 31, 2023 and 2022, and the results of its operations, changes in its net assets, and its cash flows for each of the years in the three-year period ended December 31, 2023, in conformity with U.S. generally accepted accounting principles. Also in our opinion, the Company maintained, in all material respects, effective internal control over financial reporting as of December 31, 2023 based on criteria established in Internal Control – Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission.

Basis for Opinions

The Company’s management is responsible for these consolidated financial statements, for maintaining effective internal control over financial reporting, and for its assessment of the effectiveness of internal control over financial reporting, included in the accompanying Management’s Report on Internal Control over Financial Reporting. Our responsibility is to express an opinion on the Company’s consolidated financial statements and an opinion on the Company’s internal control over financial reporting based on our audits. We are a public accounting firm registered with the Public Company Accounting Oversight Board (United States) (PCAOB) and are required to be independent with respect to the Company in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB.

We conducted our audits in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audits to obtain reasonable assurance about whether the consolidated financial statements are free of material misstatement, whether due to error or fraud, and whether effective internal control over financial reporting was maintained in all material respects.

Our audits of the consolidated financial statements included performing procedures to assess the risks of material misstatement of the consolidated financial statements, whether due to error or fraud, and performing procedures that respond to those risks. Such procedures included examining, on a test basis, evidence regarding the amounts and disclosures in the consolidated financial statements. Such procedures also included confirmation of securities owned as of December 31, 2023 and 2022, by correspondence with custodians, agents, the underlying investees or by other appropriate auditing procedures. Our audits also included evaluating the accounting principles used and significant estimates made by management, as well as evaluating the overall presentation of the consolidated financial statements. Our audit of internal control over financial reporting included obtaining an understanding of internal control over financial reporting, assessing the risk that a material weakness exists, and testing and evaluating the design and operating effectiveness of internal control based on the assessed risk. Our audits also included performing such other procedures as we considered necessary in the circumstances. We believe that our audits provide a reasonable basis for our opinions.

Definition and Limitations of Internal Control Over Financial Reporting

A company’s internal control over financial reporting is a process designed to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles. A company’s internal control over financial reporting includes those policies and procedures that (1) pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of the assets of the company; (2) provide reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance with generally accepted accounting principles, and that receipts and expenditures of the company are being made only in accordance with authorizations of management and directors of the company; and (3) provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use, or disposition of the company’s assets that could have a material effect on the financial statements.

Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Also, projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.

Critical Audit Matter

The critical audit matter communicated below is a matter arising from the current period audit of the consolidated financial statements that was communicated or required to be communicated to the audit committee and that: (1) relates to accounts or disclosures that are material to the consolidated financial statements and (2) involved our especially challenging, subjective, or complex judgments. The communication of a critical audit matter does not alter in any way our opinion on the consolidated financial statements, taken as a whole, and we are not, by communicating the critical audit matter below, providing a separate opinion on the critical audit matter or on the accounts or disclosures to which it relates.

Assessment of the fair value of investments

As discussed in Notes 2, 4, and 6 to the consolidated financial statements, the Company classified $3.21 billion of its debt and equity investments as Level 3 in the fair value hierarchy as of December 31, 2023 as the fair value of such investments was measured using unobservable inputs. The Company typically determines the fair value of performing debt investments utilizing a yield analysis where a price is ascribed for each investment based upon an assessment of market yields for similar investments and, for its equity investments, multiples of similar companies’ revenues, earnings before income taxes, depreciation and amortization or some combination thereof and comparable market transactions.

We identified the assessment of the fair value of Level 3 debt and equity investments as a critical audit matter because evaluating the assumptions used to measure fair value involved a high degree of subjective auditor judgment and changes in these assumptions could have had a significant impact on the investments’ estimated fair value. Specifically, the assumptions related to market yields for investments with similar terms and risks used in yield analyses, comparable financial performance multiples, and expected lives used in discounted cash flow analyses required subjective auditor judgment.

The following are the primary procedures we performed to address this critical audit matter. We evaluated the design and tested the operating effectiveness of certain internal controls related to the Company’s investment valuation process, including controls related to the determination of the market yields, financial performance multiples, and expected lives used to estimate the fair value of investments. We involved valuation professionals with specialized skills and knowledge who, for a selection of the Company’s investments, evaluated the Company’s estimate of fair value by developing an independent estimate of fair value through the use of relevant market information to develop a range of comparable financial performance multiples and market yield assumptions. We evaluated the Company’s ability to estimate fair value by comparing prior period values to prices of transactions occurring subsequent to the prior period valuation date.

/s/ KPMG LLP

We have served as the Company’s auditor since 2010.

New York, New York

February 15, 2024