[Form 4] California BanCorp \ CA Insider Trading Activity

Rhea-AI Filing Summary

California BanCorp director David J. Volk reported significant share movements and option holdings. On January 28, 2026, entities Castle Creek Advisors IV LLC and Castle Creek Capital Partners VI LP, with which Volk is associated, sold 2,346,104 shares of California BanCorp common stock at $18.95 per share, leaving 3,729 shares held indirectly. Volk disclaims beneficial ownership of these entity-held shares except for his pecuniary interest.

On February 3, 2026, Volk directly purchased 27,000 California BanCorp common shares at $18.64 per share, bringing his directly held stake to 28,195 shares. He also reports directly held stock options for 7,500 shares at an exercise price of $12.96 expiring on February 20, 2029, and 10,000 shares at $9.67 expiring on March 15, 2027. Unvested restricted stock units assigned to Castle Creek Advisors IV LLC are scheduled to fully vest on May 21, 2026.

Insider Trade Summary

Net Seller: 2,319,104 shares ($44,458,671)

Net Sell 4 txns

Insider Volk David J.

Role Director

Bought 27,000 shs ($503K)

Sold 2,346,104 shs ($44.46M)

Type	Security	Shares	Price	Value
Purchase	Common Stock	27,000	$18.64	$503K
holding	Stock Options	--	--	--
holding	Stock Options	--	--	--
Sale	Common Stock	2,346,104	$18.95	$44.46M

Holdings After Transaction: Common Stock — 28,195 shares (Direct); Stock Options — 7,500 shares (Direct); Common Stock — 3,729 shares (Indirect, By Castle Creek Advisors IV LLC and Castle Creek Capital Partners VI LP)

Footnotes (1)

1. These securities were held by Castle Creek Advisors IV LLC and Castle Creek Capital Partners VI LP. Mr. Volk, a managing principal of Castle Creek, disclaims beneficial ownership of such shares held by Castle Creek Advisors IV LLC 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. These unvested restricted stock units were assigned to Castle Creek Advisors IV LLC, 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.

Form 4 Insider Transactions: What Each Field Means →

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^*

Volk David J.

(Last) (First) (Middle)

C/O CALIFORNIA BANCORP

355 S. GRAND AVE STE 1200

(Street)

LOS ANGELES CA 90071

(City) (State) (Zip)

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)

3. Date of Earliest Transaction (Month/Day/Year)
02/03/2026

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	01/28/2026		S		2,346,104(1)	D	$18.95	3,729(2)	I	By Castle Creek Advisors IV LLC and Castle Creek Capital Partners VI LP
Common Stock	02/03/2026		P		27,000	A	$18.64	28,195	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
Stock Options	$12.96							02/20/2024	02/20/2029	Common Stock	7,500		7,500	D
Stock Options	$9.67							03/15/2022	03/15/2027	Common Stock	10,000		10,000	D

Explanation of Responses:

1. These securities were held by Castle Creek Advisors IV LLC and Castle Creek Capital Partners VI LP. Mr. Volk, a managing principal of Castle Creek, disclaims beneficial ownership of such shares held by Castle Creek Advisors IV LLC 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.

2. These unvested restricted stock units were assigned to Castle Creek Advisors IV LLC, 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.

Remarks:

	Manisha Merchant, by POA for David Volk	02/05/2026
	** 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.

FAQ

What insider transactions did California BanCorp (BCAL) disclose for David J. Volk?

The filing shows California BanCorp director David J. Volk reporting a large indirect sale and a direct purchase of common stock, plus existing stock option holdings, all dated in early 2026 and detailed with share counts, prices, and remaining positions.

How many California BanCorp shares were sold by entities associated with David J. Volk?

Entities Castle Creek Advisors IV LLC and Castle Creek Capital Partners VI LP sold 2,346,104 California BanCorp common shares at $18.95 per share, leaving 3,729 shares held indirectly. Volk disclaims beneficial ownership of these entity-held shares except to the extent of his pecuniary interest.

How many California BanCorp shares did David J. Volk buy directly in this Form 4?

On February 3, 2026, David J. Volk directly purchased 27,000 California BanCorp common shares at $18.64 per share. After this transaction, his directly held position in California BanCorp common stock totaled 28,195 shares.

What stock options does California BanCorp director David J. Volk hold?

Volk reports two directly held California BanCorp stock option positions: 7,500 options at an exercise price of $12.96 expiring on February 20, 2029, and 10,000 options at $9.67 expiring on March 15, 2027, each covering common stock.

How does the Form 4 describe David J. Volk’s beneficial ownership of Castle Creek-held shares?

The Form 4 explains that shares were held by Castle Creek Advisors IV LLC and Castle Creek Capital Partners VI LP, and states that Volk disclaims beneficial ownership of those shares except to the extent of his pecuniary interest, clarifying his indirect economic exposure.

When will the restricted stock units linked to California BanCorp and Castle Creek Advisors IV LLC vest?

The unvested restricted stock units were assigned to Castle Creek Advisors IV LLC on behalf of David Volk as a California BanCorp director. According to the filing, these restricted stock units will become fully vested on May 21, 2026.