California BanCorp director buys $9,958 in stock

A California BanCorp director disclosed an open-market purchase of 450 BCAL shares via a spouse-held account, increasing both indirect and overall reported holdings.

Rhea-AI Filing Summary

California BanCorp (BCAL) director Frank L. Muller reported purchasing 450 shares of Common Stock on September 4, 2026, in an open-market or private transaction at $22.13 per share. The transaction is reported as indirect ownership by his spouse, bringing that indirect position to 2,377 shares.

Separate from this, Muller is also reported as holding 37,933.43 shares directly. No Rule 10b5-1 trading plan is reported for these transactions.

Insider Trade Summary

Net Buyer: 450 shares

Net Buy 2 txns

Insider Muller Frank L.

Role Director

Bought 450 shs ($10K)

Type	Security	Shares	Price	Value
Purchase	Common Stock	450	$22.13	$10K
holding	Common Stock	--	--	--

Holdings After Transaction: Common Stock — 2,377 shares (Indirect, By spouse); Common Stock — 37,933.43 shares (Direct)

Key Figures

Shares purchased: 450 shares Purchase price per share: $22.13 per share Transaction value: $9,958.50 +2 more

5 metrics

Shares purchased 450 shares Common Stock bought on September 4, 2026 in an open-market or private transaction

Purchase price per share $22.13 per share Price paid for California BanCorp Common Stock on September 4, 2026

Transaction value $9,958.50 Approximate total cost of 450 shares at $22.13 per share

Indirect holdings after transaction 2,377 shares California BanCorp Common Stock held indirectly by spouse after the purchase

Direct holdings 37,933.43 shares California BanCorp Common Stock reported as held directly by Frank L. Muller

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What insider transaction did BCAL director Frank L. Muller report?

Frank L. Muller reported buying 450 shares of California BanCorp Common Stock on September 4, 2026 in an open-market or private transaction, at a reported price of $22.13 per share, held indirectly through his spouse.

At what price were the BCAL shares purchased in this Form 4?

The reported purchase price was $22.13 per share for the 450 California BanCorp Common Stock shares acquired on September 4, 2026, in an open-market or private transaction.

How many BCAL shares does Frank L. Muller now hold indirectly?

After the reported transaction, Frank L. Muller reports 2,377 shares of California BanCorp Common Stock held indirectly, attributed to ownership by his spouse.

How many BCAL shares does Frank L. Muller hold directly after this filing?

The Form 4 reports that Frank L. Muller holds 37,933.43 shares of California BanCorp Common Stock directly, in addition to his separately reported indirect holdings through his spouse.

Was the BCAL insider share purchase made under a Rule 10b5-1 trading plan?

No. The filing indicates that the Rule 10b5-1 checkbox is not marked, so no Rule 10b5-1 trading plan is reported in connection with the September 4, 2026 purchase.

What is the total reported value of the BCAL shares purchased by the director?

The director purchased 450 shares at $22.13 per share, for an approximate total value of $9,958.50 in California BanCorp Common Stock, held indirectly through his spouse.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Available on EDGAR 09/09/2026 - 08:08 PM Accepted by SEC EDGAR 09/09/2026 - 08:07 PM Learn about SEC filing dates

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^*

Muller Frank L.

(Last) (First) (Middle)

C/O CALIFORNIA BANCORP

355 S. GRAND AVE STE 1200

(Street)

LOS ANGELES CALIFORNIA 90071

(City) (State) (Zip)

UNITED STATES

(Country)

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)

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
09/04/2026

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	09/04/2026		P		450	A	$22.13	2,377	I	By spouse
Common Stock								37,933.43	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:

Remarks:

	Manisha Merchant, by POA for Frank Muller	09/09/2026
	** 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)