Statement of Changes in Beneficial Ownership (Form 4)

FORM 4 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 that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

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

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1. Name and Address of Reporting Person * Volk David J. 2. Issuer Name and Ticker or Trading Symbol California BanCorp \ CA [BCAL] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) __X__ Director _____ 10% Owner _____ Officer (give title below) _____ Other (specify below) (Last) (First) (Middle) C/O CALIFORNIA BANCORP, 355 S. GRAND AVE STE 1200 3. Date of Earliest Transaction (Month/Day/Year) 05/21/2025 (Street) LOS ANGELES, CA 90071 4. If Amendment, Date 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 (City) (State) (Zip) 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 05/21/2025 A 3,729(1) A $ 0 2,349,833(2) I By Castle Creek Advisors IV LLC and Castle Creek Capital Partners VI LP Common Stock 1,195 D

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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 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

Stock Options

$12.96

02/20/2024(3)

02/20/2029

Common Stock

7,500

7,500

D

Stock Options

$9.67

03/15/2022(3)

03/15/2027

Common Stock

10,000

10,000

D

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
Volk David J. C/O CALIFORNIA BANCORP 355 S. GRAND AVE STE 1200 LOS ANGELES, CA 90071	X

Signatures

Manisha Merchant, as attorney in fact for Volk David J.		05/23/2025
**Signature of Reporting Person		Date

Explanation of Responses:

*	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).
(1)	These restricted stock units, each of which represents the right to receive one share of common stock of California BanCorp, Inc. (Common Stock), were assigned to Castle Creek Advisors IV LLC (Advisors IV), on behalf of David Volk in his capacity as a member of the Board of Directors of California BanCorp, Inc. and will become fully vested on May 21, 2026.
(2)	Includes 6,875 shares of unvested RSUs held by Advisors IV and 2,340,719 shares of Common Stock held by Castle Creek Capital Partners VI LP. Mr. Volk, a managing principal of Castle Creek, disclaims beneficial ownership of such shares held by Advisors IV and Castle Creek Capital Partners VI LP, except to the extent of his pecuniary interest therein and this report shall not be deemed an admission that the reporting person is the beneficial owner of such securities for purposes of Section 16 of the Securities Exchange Act of 1934, as amended, or for any other purpose.
(3)	These options are fully vested.

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