Filed by FS Specialty Lending Fund

pursuant to Rule 425 under the Securities Act of 1933

and deemed filed under Rule 14a-6(b) of the Securities Exchange Act of 1934

Subject Company: New FS Specialty Lending Fund

File No. of Registration Statement: 333-286859

Action required! Your vote is needed to list FSSL on NYSE. Visit Qroxv.vote.com or call 833-868-3374. Vote now New FS Specialty Lending Fund has filed a joint proxy statement/prospectus and other proxy materials with the Securities and Exchange Commission (SEC) in connection with the matters described herein. Investors are urged to read the proxy materials and any other relevant documents because they contain important information about the proposals. Free copies of the proxy statement/prospectus and other proxy materials are available on the SEC's website at www.sec.gov or at www.fsRroxy.com.