Five Star Bancorp (FSBC) director adds 1,136 shares in open-market purchase

Rhea-AI Filing Summary

Five Star Bancorp director Donna Lucas purchased 1,136 shares of common stock on July 22, 2026 at $44 per share in an open-market or private transaction. The shares are held indirectly through the Lucas Family Trust, where she serves as trustee, bringing her indirect holdings to 14,254 shares, including 974 unvested shares under the 2021 Equity Incentive Plan scheduled to vest on December 31, 2026, contingent on her continued service as director. The filing indicates this trade was not executed under a Rule 10b5-1 trading plan.

Insider Trade Summary

Net Buyer: 1,136 shares

Net Buy 1 txn

Insider Lucas Donna

Role Director

Bought 1,136 shs ($50K)

Type	Security	Shares	Price	Value
Purchase	Common Stock F1, F2	1,136	$44.00	$50K

Holdings After Transaction: Common Stock — 14,254 shares (Indirect, By self as trustee)

Footnotes (2)

1. F1. Includes 974 unvested shares granted pursuant to the Five Star Bancorp 2021 Equity Incentive Plan with all shares scheduled to vest on December 31, 2026, provided the reporting person, Ms. Lucas, remains as a director with Five Star Bancorp on that date.
2. F2. Shares are held in the Lucas Family Trust dated September 4, 2002, for which Ms. Lucas serves as a trustee.

Key Figures

Shares purchased: 1,136 shares Purchase price: $44.00 per share Total indirect holdings: 14,254 shares +1 more

4 metrics

Shares purchased 1,136 shares Common stock purchased on July 22, 2026 by director Donna Lucas

Purchase price $44.00 per share Price paid for the 1,136 common shares

Total indirect holdings 14,254 shares Indirect common stock holdings after the transaction, including unvested shares

Unvested equity awards 974 shares Unvested shares under the Five Star Bancorp 2021 Equity Incentive Plan vesting December 31, 2026

Key Terms

unvested shares, Five Star Bancorp 2021 Equity Incentive Plan, Lucas Family Trust

3 terms

unvested shares financial

"Includes 974 unvested shares granted pursuant to the Five Star Bancorp 2021 Equity Incentive Plan"

Five Star Bancorp 2021 Equity Incentive Plan financial

"granted pursuant to the Five Star Bancorp 2021 Equity Incentive Plan with all shares scheduled to vest"

Lucas Family Trust financial

"Shares are held in the Lucas Family Trust dated September 4, 2002, for which Ms. Lucas serves"

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Form 4 Insider Transactions: What Each Field Means →

Available on EDGAR 07/24/2026 - 04:32 PM Accepted by SEC EDGAR 07/24/2026 - 04:32 PM Learn about SEC filing dates

FAQ

What insider transaction did Five Star Bancorp (FSBC) director Donna Lucas report?

Donna Lucas reported buying 1,136 shares of Five Star Bancorp common stock at $44 per share on July 22, 2026. The purchase was reported as an open-market or private transaction and increased her indirect holdings held through a family trust.

How many Five Star Bancorp (FSBC) shares does Donna Lucas now indirectly hold?

After the reported transaction, Donna Lucas indirectly holds 14,254 shares of Five Star Bancorp common stock. This figure includes 974 unvested shares granted under the company’s 2021 Equity Incentive Plan, which are scheduled to vest on December 31, 2026, subject to continued board service.

Were Donna Lucas’s Five Star Bancorp (FSBC) share purchases under a Rule 10b5-1 plan?

No. The Form 4 indicates the Rule 10b5-1 checkbox was not selected, meaning the 1,136-share purchase on July 22, 2026 was not reported as being executed under a pre-arranged trading plan, but as a regular discretionary transaction.

How are Donna Lucas’s Five Star Bancorp (FSBC) shares held after this transaction?

The reported shares are held indirectly through the Lucas Family Trust, dated September 4, 2002, for which Ms. Lucas serves as trustee. The Form 4 lists her ownership as indirect, described as “By self as trustee,” covering all 14,254 shares.

What unvested Five Star Bancorp (FSBC) equity does Donna Lucas have and when does it vest?

Donna Lucas’s total includes 974 unvested shares granted under the Five Star Bancorp 2021 Equity Incentive Plan. All of these shares are scheduled to vest on December 31, 2026, provided she continues to serve as a director with the company through that date.

What type of security did Donna Lucas buy in Five Star Bancorp (FSBC)?

She bought common stock of Five Star Bancorp, totaling 1,136 shares at $44 per share. The transaction increased her indirect common stock position held via the Lucas Family Trust to 14,254 shares, combining vested and unvested equity awards.

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^*

Lucas Donna

(Last) (First) (Middle)

C/O FIVE STAR BANCORP

3100 ZINFANDEL DRIVE, SUITE 100

(Street)

RANCHO CORDOVA CALIFORNIA 95670

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
FIVE STAR BANCORP [ FSBC ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director		10% Owner
	Officer (give title below)		Other (specify below)

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
07/22/2026

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

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

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

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	07/22/2026		P		1,136	A	$44	14,254(1)	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 (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 974 unvested shares granted pursuant to the Five Star Bancorp 2021 Equity Incentive Plan with all shares scheduled to vest on December 31, 2026, provided the reporting person, Ms. Lucas, remains as a director with Five Star Bancorp on that date.

2. Shares are held in the Lucas Family Trust dated September 4, 2002, for which Ms. Lucas serves as a trustee.

Remarks:

	/s/ Donna L. Lucas, by Heather C. Luck, Attorney-in-Fact	07/24/2026
	** 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.
* Form 4: SEC 1474 (03-26)