Sec Form 4 Filing - Rizzo Michael Anthony @ FIVE STAR BANCORP - 2022-07-29

FORM 4 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person Rizzo Michael Anthony 2. Issuer Name and Ticker or Trading Symbol FIVE STAR BANCORP [ FSBC] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner X __ Officer (give title below) _____ Other (specify below) SVP & Chief Banking Officer (Last) (First) (Middle) C/O FIVE STAR BANCORP, 3100 ZINFANDEL DRIVE, SUITE 100 3. Date of Earliest Transaction (MM/DD/YY) 07/29/2022 (Street) RANCHO CORDOVA, CA95670 4. If Amendment, Date Original Filed (MM/DD/YY) 6. Individual or Joint/Group Filing (Check Applicable Line) __ X __ Form filed by One Reporting Person _____ Form filed by More than One Reporting Person (City) (State) (Zip)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned 1.Title of Security (Instr. 3) 2. Transaction Date (MM/DD/YY) 2A. Deemed Execution Date, if any (MM/DD/YY) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price Common Stock 07/29/2022 J( 1 ) 641 D $ 0 0 I See footnote( 1 ) Common Stock 07/29/2022 J( 1 ) 641 A $ 0 641 I See footnote( 1 ) Common Stock 22,906 I By self as trustee( 2 )

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities) 1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (MM/DD/YY) 3A. Deemed Execution Date, if any (MM/DD/YY) 4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4, and 5) 6. Date Exercisable and Expiration Date (MM/DD/YY) 7. Title and Amount of Underlying Securities (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4) Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other Rizzo Michael Anthony C/O FIVE STAR BANCORP 3100 ZINFANDEL DRIVE, SUITE 100 RANCHO CORDOVA, CA95670 SVP & Chief Banking Officer Signatures /s/ Michael A. Rizzo, by Heather C. Luck, Attorney-in-Fact 08/02/2022 Signature of Reporting Person Date

Explanation of Responses:

( 1 )Discretionary transfer of shares of common stock from The Rizzo Living Trust, dated 4/29/99, for the benefit of Mr. Rizzo's child and for which Mr. Rizzo served as custodian, to Mr. Rizzo's child. After the transfer, the child has direct ownership of the 641 shares. Mr. Rizzo's child resides in Mr. Rizzo's household. ( 2 )Shares are held by The Rizzo Family Trust, dated December 4, 2019, for which Mr. Rizzo serves as trustee. Consists of 129 shares of unvested stock awards which are scheduled to vest on January 1, 2023, 5,600 shares which were granted pursuant to the Five Star Bancorp 2021 Equity Incentive Plan and are scheduled to vest in equal installments over a four-year period, and 344 shares which were granted pursuant to the Five Star Bancorp 2021 Equity Incentive Plan and are scheduled to vest in equal installments over a two-year period, provided Mr. Rizzo remains employed by Five Star Bancorp on the respective vesting dates.

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.

* If the form is filed by more than one reporting person, see Instruction 4(b)(v).

** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).

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