Prospectus by Investment Company (Form 497AD)

Filed Pursuant to Rule 497(a)

Registration No. 333-278993

Rule 482ad

[TEXT OF COMMUNICATION SENT VIA BLOOMBERG]

--Disclaimers--

Investors are advised to carefully consider the investment objectives, risks, charges and expenses of Carlyle Secured Lending, Inc. before investing. The issuer has filed a registration statement (including a prospectus and a preliminary prospectus supplement) with the Securities and Exchange Commission (SEC) for the offering to which this communication relates. Before you invest, you should read the preliminary prospectus supplement relating to this offering, together with the accompanying prospectus, filed with the SEC and other documents Carlyle Secured Lending, Inc. has filed with the SEC for more complete information about Carlyle Secured Lending, Inc. and this offering. The information in the preliminary prospectus supplement and the accompanying prospectus, and in this announcement, is not complete and may be changed.

You may obtain these documents for free by visiting EDGAR on the SEC web site at www.sec.gov. Alternatively, the issuer, any underwriter or any dealer participating in the offering will arrange to send you the prospectus and the preliminary prospectus supplement if you request them by contacting J.P. Morgan Securities LLC, 383 Madison Avenue, New York, New York 10179, Attn: Investment Grade Syndicate Desk, facsimile: 212-834-6081 or by calling at 1-212-834-4533, Barclays Capital Inc., 745 Seventh Avenue, New York, New York 10019, Attention: Syndicate Registration, facsimile: 646-834-8133 or by calling at 1-888-603-5847, BofA Securities, Inc., 114 W 47^th St., NY8-114-07-01, New York, New York 10036, facsimile: 212-901-7881, Attention: High Grade Debt Capital Markets Transaction Management/Legal or by calling toll-free at 1-800-294-1322, Citigroup Global Markets Inc., 388 Greenwich Street, New York, New York 10013, attention of General Counsel, facsimile: 646-291-1469 or by calling toll-free at 1-800-831-9146, Deutsche Bank Securities Inc., 1 Columbus Circle, New York, New York 10019, Attention: Debt Capital Markets Syndicate, email: [email protected] or by calling at 1-800-503-4611 or Morgan Stanley & Co. LLC, 1585 Broadway, 29^th Floor, New York, New York 10036, Attn: Investment Banking Division, facsimile: 203-719-0495 or by calling toll-free at 1-866-718-1649.

The preliminary prospectus supplement, the accompanying prospectus and this announcement do not constitute offers to sell or the solicitation of offers to buy nor will there be any sale of the securities referred to in this announcement in any state or jurisdiction in which such offer, solicitation or sale would be unlawful prior to the registration or qualification under the securities laws of such state or jurisdiction.

Any disclaimers or other notices that may appear below are not applicable to this communication and should be disregarded (other than any statement relating to the identity of the legal entity authorizing or sending this communication in a non-US jurisdiction). Such disclaimers or other notices were automatically generated as a result of this communication having been sent via Bloomberg or another email system.