FIVE STAR BANCORP

This proxy statement and the Annual Report on Form 10-K for the year ended December 31, 2025 (the “Annual Report on Form 10-K”) are available on the Company’s investor relations website at https://investors.fivestarbank.com/financial-information/sec-filings. You can also obtain copies free of charge on the Securities and Exchange Commission’s (“SEC”) website at https://www.sec.gov. A Notice of Internet Availability of Proxy Materials regarding this proxy statement is being first mailed to shareholders on or about March 30, 2026, containing instructions on how to access and review this proxy statement and the Annual Report on Form 10-K. The Notice of Internet Availability of Proxy Materials also instructs you as to how you may submit your proxy card via the internet, telephone, or mail (if you received printed proxy materials). If you would like to receive a printed copy of our proxy materials, you should follow the instructions for requesting those materials included in the Notice of Internet Availability of Proxy Materials.

Website addresses referenced herein are intended to provide inactive, textual references only, and the information on these websites is not part of, and shall not be deemed incorporated by reference in, this proxy statement.