Rainer trust tied to California BanCorp (BCAL) sells 75,000 shares at $19

Filing Impact

(Very High)

Filing Sentiment

(Negative)

Form Type

Rhea-AI Filing Summary

California BanCorp Executive Chairman David Rainer, through the DAVID AND ANNE RAINER TRUST U/A DTD 05/07/1997, reported an open-market sale of 75,000 shares of Common Stock at $19.00 per share on May 7, 2026.

After this indirect sale, the trust holds 356,347 shares, while Rainer also has a separate direct holding of 144,928 shares of California BanCorp Common Stock.

Insider Trade Summary

Net Seller: 75,000 shares ($1,425,000)

Net Sell 2 txns

Insider Rainer David I

Role Executive Chairman

Sold 75,000 shs ($1.43M)

Type	Security	Shares	Price	Value
Sale	Common Stock	75,000	$19.00	$1.43M
holding	Common Stock	--	--	--

Holdings After Transaction: Common Stock — 356,347 shares (Indirect, DAVID AND ANNE RAINER TRUST U/A DTD 05/07/1997); Common Stock — 144,928 shares (Direct, null)

Footnotes (1)

Key Figures

Shares sold: 75,000 shares Sale price: $19.00 per share Indirect holdings after sale: 356,347 shares +1 more

4 metrics

Shares sold 75,000 shares Open-market sale on May 7, 2026

Sale price $19.00 per share Transaction price for the 75,000 shares

Indirect holdings after sale 356,347 shares Held by DAVID AND ANNE RAINER TRUST

Direct holdings 144,928 shares Direct Common Stock holding reported for David Rainer

Key Terms

open-market sale, indirect ownership, Common Stock, Form 4

4 terms

open-market sale financial

"transaction_action": "open-market sale""

An open-market sale is when a shareholder sells existing shares directly on a public exchange to any willing buyer, rather than through a private deal. Think of it like putting goods on a busy market stall where price is set by supply and demand; for investors it matters because such sales increase available supply, can put short-term downward pressure on the stock price, and signal changes in liquidity or investor confidence.

indirect ownership financial

""direct_or_indirect": "I","ownership_type": "indirect""

Common Stock financial

""security_title": "Common Stock""

Common stock represents ownership shares in a company, giving investors a stake in its success and a say in important decisions through voting rights. It is the most common type of stock traded on markets and can provide income through dividends, as well as potential for value growth. For investors, holding common stock means sharing in the company’s profits and risks.

Form 4 regulatory

"INSIDER FILING DATA (Form 4)"

Form 4 is a official document that company insiders, such as executives or major shareholders, file with regulators whenever they buy or sell company shares. It provides transparency about how those with inside knowledge are trading, helping investors see if insiders are confident in the company's prospects or may be selling for personal reasons. This information can influence investor decisions by revealing insiders' perspectives on the company's value.

Form 4 Insider Transactions: What Each Field Means →

05/08/2026 - 04:40 PM

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^*

Rainer David I

(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
X	Officer (give title below)	Other (specify below)
	Executive Chairman

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
05/07/2026

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)
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	Amount	(A) or (D)	Price		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
Common Stock	05/07/2026		S		75,000	D	$19	356,347	I	DAVID AND ANNE RAINER TRUST U/A DTD 05/07/1997
Common Stock								144,928	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)
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)	Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	8. Price of Derivative Security (Instr. 5)		10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)

Explanation of Responses:

Remarks:

	Manisha Merchant, by POA for David Rainer	05/08/2026
	** 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)

Source: View Original Filing on SEC EDGAR

FAQ

What insider transaction did California BanCorp (BCAL) report for David Rainer?

California BanCorp reported that the DAVID AND ANNE RAINER TRUST, associated with Executive Chairman David Rainer, completed an open-market sale of 75,000 shares of BCAL Common Stock at $19.00 per share on May 7, 2026.

At what price were the California BanCorp (BCAL) shares sold in the recent Form 4?

The DAVID AND ANNE RAINER TRUST sold 75,000 California BanCorp (BCAL) Common Stock shares at a transaction price of $19.00 per share, according to the Form 4 insider trading report filed for Executive Chairman David Rainer.

How many California BanCorp (BCAL) shares does the Rainer trust hold after the sale?

Following the reported open-market transaction, the DAVID AND ANNE RAINER TRUST holds 356,347 shares of California BanCorp (BCAL) Common Stock as an indirect position attributed to Executive Chairman David Rainer in the Form 4 filing.

What is David Rainer’s direct ownership in California BanCorp (BCAL) after the filing?

In addition to the trust’s indirect holdings, Executive Chairman David Rainer is reported as directly holding 144,928 shares of California BanCorp (BCAL) Common Stock, based on the holding entry included in the same Form 4 filing.

Was the California BanCorp (BCAL) insider trade an open-market sale?

Yes. The Form 4 describes the 75,000-share transaction in California BanCorp (BCAL) Common Stock as an open-market sale, identified with transaction code “S” and labeled as a sale in open market or private transaction.