FORM 10-Q QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGEACT OF 1934 For the quarterly period ended March31, 2026OR TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGEACT OF 1934 For the transition periodtoCommission File No.814-00995 Carlyle Secured Lending, Inc.(Exact name of Registrant as specified in its charter) Maryland(State or other jurisdiction of incorporation or organization) One Vanderbilt Avenue, Suite 3400, New York, NY 10017(Address of principal executive office) (Zip Code) (Registrant’s telephone number, including area code) N/A (Former name, former address and former fiscal year, if changed since last report) Securities registered pursuant to Section 12(b) of the Act: Name of Each Exchange on Which RegisteredThe Nasdaq Global Select Market Indicate by check mark whether the registrant (1)has filed all reports required to be filed by Section13 or 15(d) of the Securities Exchange Act of 1934during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2)has been subject to such filingrequirements for the past 90days:Yes☒No☐ Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 ofRegulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit suchfiles).Yes☒No☐ Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company, or anemerging growth company. See definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and “emerging growth company” inRule 12b-2 of the Exchange Act. (Check one): Large accelerated filer☒Non-accelerated filerEmerging growth company If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with anynew or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.☐ Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).Yes☐No☒ The number of shares of the registrant’s common stock, $0.01 par value per share, outstanding atMay8, 2026was69,497,128. CARLYLE SECURED LENDING, INC.INDEX PART I.FINANCIAL INFORMATION Item1.Financial StatementsConsolidated Statements of Assets and Liabilities as of March 31, 2026 (unaudited) and December 31, 20253Consolidated Statements of Operations for the three months ended March 31, 2026 and 2025(unaudited)4Consolidated Statements of Changes in Net Assets for the three months ended March 31, 2026 and 2025(unaudited)6Consolidated Statements of Cash Flows for the three months ended March 31, 2026 and 2025(unaudited)7Consolidated Schedules of Investments as of March 31, 2026 (unaudited) and December 31, 20259Notes to Consolidated Financial Statements (unaudited)48Item 2.Management’s Discussion and Analysis of Financial Condition and Results of Operations95Item 3.Quantitative and Qualitative Disclosures About Market Risk116Item 4.Controls and Procedures117PARTII.OTHER INFORMATIONItem 1.Legal Proceedings118Item1A.Risk Factors118Item 2.Unregistered Sales of Equity Securities and Use of Proceeds118Item 3.Defaults Upon Senior Securities118Item 4.Mine Safety Disclosures118Item 5.Other Information119Item 6.Exhibits120Signatures121 PART I. FINANCIAL INFORMATION (amounts in thousands, except share and per share data) (unaudited) Table of Contents CARLYLE SECURED LENDING, INC.CONSOLIDATED STATEMENTS OF CHANGES IN NET ASSETS(amounts in thousands) (unaudited) The accompanying notes are an integral part of these unaudited consolidated financial statements. CARLYLE SECURED LENDING, INC.CONSOLIDATED SCHEDULE OF INVESTMENTSAs of March31, 2026(amounts in thousands) (unaudited) CARLYLE SECURED LENDING, INC.CONSOLIDATED SCHEDULE OF INVESTMENTSAs of March31, 2026(amounts in thousands) (unaudited) CARLYLE SECURED LENDING, INC.CONSOLIDATED SCHEDULE OF INVESTMENTSAs of March31, 2026(amounts in thousands) (unaudited) CARLYLE SECURED LENDING, INC.CONSOLIDATED SCHEDULE OF INVESTMENTSAs of March31, 2026(amounts in thousands) (unaudited) CARLYLE SECURED LENDING, INC.CONSOLIDATED SCHEDULE OF INVESTMENTSAs of March31, 2026(amounts in thousands) (unaudited) CARLYLE SECURED LENDING, INC.CONSOLIDATED SCHEDULE OF INVESTMENTSAs of March31, 2026(amounts in thousands) (unaudited) CARLYLE SECURED LENDING, INC.CONSOLIDATED SCHEDULE OF INVESTMENTSAs of March31, 2026(amounts in thousands) (unaudited) CARLYLE SECURED LENDING, INC.CONSOLIDATED SCHEDULE OF INVESTMENTSAs of March31, 2026(amounts in thousands) (unaudited) CARLYLE SECURED LENDING, INC.CONSOLIDATED SCHEDULE OF INVESTMENTSAs of March31, 2026(amounts in thousands) (unaudited) (a) Denotes that all or a portion of the a