Bank of Marin CFO delivers or withholds 273 shares

The transaction left the EVP and chief financial officer with 17,491 directly held shares.

Rhea-AI Filing Summary

Bank of Marin Bancorp EVP and Chief Financial Officer David Bonaccorso reported that 273 shares were delivered or withheld for payment of exercise price or tax liability on September 22, 2026, at $28 per share. He reported direct holdings of 17,491 shares following the transaction. No Rule 10b5-1 plan is reported.

Insider Trade Summary

Exercise Price or Tax Liability: 273 shares

Exercise Price or Tax Liability 1 txn

Insider Bonaccorso David

Role EVP, Chief Financial Officer

Type	Security	Shares	Price	Value
Exercise Price or Tax Liability	Common Stock	273	$28.00	$8K

Holdings After Transaction: Common Stock — 17,491 shares (Direct)

Key Figures

Shares delivered or withheld: 273 shares Price per share: $28 per share Direct holdings after transaction: 17,491 shares

3 metrics

Shares delivered or withheld 273 shares For payment of exercise price or tax liability on September 22, 2026

Price per share $28 per share Reported transaction on September 22, 2026

Direct holdings after transaction 17,491 shares Following the transaction on September 22, 2026

Key Terms

Rule 10b5-1, exercise price or tax liability, non-derivative

3 terms

Rule 10b5-1 regulatory

"No Rule 10b5-1 plan is reported"

Rule 10b5-1 is a regulation that allows company insiders to buy or sell their shares at predetermined times, even if they have access to non-public information. It acts like setting a schedule in advance for transactions, helping prevent accusations of unfair trading. This rule provides a way for insiders to plan trades transparently, giving investors confidence that these transactions are not based on hidden information.

exercise price or tax liability financial

"payment of exercise price or tax liability"

non-derivative technical

"non-derivative transaction"

FAQ

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

How many BMRC shares did its CFO report delivering or withholding?

David Bonaccorso, EVP and Chief Financial Officer, reported 273 shares delivered or withheld for payment of exercise price or tax liability on September 22, 2026, at $28 per share.

How many BMRC shares did David Bonaccorso hold after the transaction?

David Bonaccorso reported direct holdings of 17,491 shares following the transaction.

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

Form 4 Insider Transactions: What Each Field Means →

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Available on EDGAR 09/24/2026 - 12:45 PM Accepted by SEC EDGAR 09/24/2026 - 12:44 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^*

Bonaccorso David

(Last) (First) (Middle)

504 REDWOOD BLVD., SUITE 100

(Street)

NOVATO CALIFORNIA 94947

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
Bank of Marin Bancorp [ BMRC ]

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

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	EVP, Chief Financial Officer

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
09/22/2026

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	09/22/2026		F		273	D	$28	17,491	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:

	/s/ Krissy Meyer, Attorney-in-Fact	09/24/2026
	** 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)