[Form 4] FIVE STAR BANCORP Insider Trading Activity

Rhea-AI Filing Summary

Five Star Bancorp executive reports small stock sale

Five Star Bancorp's EVP & Chief Operating Officer, Lydia A. Ramirez-Medina, reported selling 600 shares of the company's common stock on 11/19/2025 at a price of $33.07 per share. Following this transaction, she beneficially owns 11,360 shares of Five Star Bancorp common stock.

Her holdings include shares granted under the Five Star Bancorp 2021 Equity Incentive Plan. This consists of 4,332 shares (with 3,465 already vested and 867 scheduled to vest over the remainder of a five-year period), 6,000 shares (with 1,200 vested and 4,800 scheduled to vest over the remainder of a five-year period), and 3,629 additional shares that are scheduled to vest in equal installments over a five-year period beginning in 2026, in each case contingent on continued employment.

SEC Form 4

FORM 4

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
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

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

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Ramirez-Medina Lydia Ann

(Last) (First) (Middle)

C/O FIVE STAR BANCORP

3100 ZINFANDEL DRIVE, SUITE 100

(Street)

RANCHO CORDOVA CA 95670

(City) (State) (Zip)

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)
	EVP & Chief Operating Officer

3. Date of Earliest Transaction (Month/Day/Year)
11/19/2025

4. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	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	11/19/2025		S		600	D	$33.07	11,360(1)	D

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 (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	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 (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (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: 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

Explanation of Responses:

1. Includes 4,332 shares granted pursuant to the Five Star Bancorp 2021 Equity Incentive Plan (including 3,465 shares which have vested and 867 which are scheduled to vest in equal installments over the remainder of a five-year period, provided Ms. Ramirez remains employed by Five Star Bancorp on the respective vesting dates), 6,000 shares granted pursuant to the Five Star Bancorp 2021 Equity Incentive Plan (including 1,200 shares which have vested and 4,800 which are scheduled to vest in equal installments over the remainder of a five-year period, provided Ms. Ramirez remains employed by Five Star Bancorp on the respective vesting dates), and 3,629 shares granted pursuant to the Five Star Bancorp 2021 Equity Incentive Plan which are scheduled to vest in equal installments over a five-year period beginning in 2026.

Remarks:

	/s/ Lydia A. Ramirez-Medina, by Heather C. Luck, Attorney-in-Fact	11/20/2025
	** Signature of Reporting Person	Date
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).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.

FAQ

What insider transaction did FSBC report for its EVP & COO?

FSBC reported that its EVP & Chief Operating Officer, Lydia A. Ramirez-Medina, sold 600 shares of Five Star Bancorp common stock on 11/19/2025 at a price of $33.07 per share.

How many FSBC shares does Lydia A. Ramirez-Medina own after the transaction?

After the reported sale, Lydia A. Ramirez-Medina beneficially owns 11,360 shares of Five Star Bancorp (FSBC) common stock.

What equity awards under the Five Star Bancorp 2021 Equity Incentive Plan does the FSBC EVP & COO hold?

Her holdings include 4,332 shares granted under the 2021 Equity Incentive Plan (3,465 vested and 867 scheduled to vest over the remainder of a five-year period), 6,000 shares (1,200 vested and 4,800 scheduled to vest over the remainder of a five-year period), and 3,629 shares scheduled to vest in equal installments over a five-year period beginning in 2026, subject to continued employment.

What type of SEC filing is this for Five Star Bancorp (FSBC)?

This is a Form 4 filing, which reports changes in the beneficial ownership of Five Star Bancorp (FSBC) securities by an insider.

What is the relationship of the reporting person to Five Star Bancorp (FSBC)?

The reporting person, Lydia A. Ramirez-Medina, is an officer of Five Star Bancorp, serving as EVP & Chief Operating Officer.

Are the unvested FSBC equity awards subject to continued employment conditions?

Yes. The unvested shares granted under the Five Star Bancorp 2021 Equity Incentive Plan are scheduled to vest in equal installments over specified five-year periods, provided that Ms. Ramirez remains employed by Five Star Bancorp on the respective vesting dates.