# EDGAR Filing Document

**Accession Number:** 0001403475
**File Stem:** 0001403064-26-000004
**Filing Date:** 2026-5
**Character Count:** 7877
**Document Hash:** 7a73067540939882e58c38757f76d49f
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001403064-26-000004.hdr.sgml**: 20260506

**ACCESSION NUMBER**: 0001403064-26-000004

**CONFORMED SUBMISSION TYPE**: 4

**PUBLIC DOCUMENT COUNT**: 1

**CONFORMED PERIOD OF REPORT**: 20240401

**FILED AS OF DATE**: 20260506

**DATE AS OF CHANGE**: 20260506

**REPORTING-OWNER**: 

**OWNER DATA:**
- **COMPANY CONFORMED NAME:** Colombo Russell A
- **CENTRAL INDEX KEY:** 0001403064

**ORGANIZATION NAME:**

**FILING VALUES:**
- **FORM TYPE:** 4
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-33572
- **FILM NUMBER:** 26949934

**MAIL ADDRESS:**
- **STREET 1:** 504 REDWOOD BOULEVARD, SUITE 100
- **CITY:** NOVATO
- **STATE:** CA
- **ZIP:** 94947
**ISSUER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** Bank of Marin Bancorp
- **CENTRAL INDEX KEY:** 0001403475
- **STANDARD INDUSTRIAL CLASSIFICATION:** STATE COMMERCIAL BANKS [6022]
- **ORGANIZATION NAME:** 02 Finance
- **EIN:** 208859754
- **STATE OF INCORPORATION:** CA
- **FISCAL YEAR END:** 1231

**BUSINESS ADDRESS:**
- **STREET 1:** 504 REDWOOD BOULEVARD, SUITE 100
- **CITY:** NOVATO
- **STATE:** CA
- **ZIP:** 94947
- **BUSINESS PHONE:** 415-763-7781

**MAIL ADDRESS:**
- **STREET 1:** 504 REDWOOD BOULEVARD, SUITE 100
- **CITY:** NOVATO
- **STATE:** CA
- **ZIP:** 94947

### UNITED STATES SECURITIES AND EXCHANGE COMMISSION
**Washington, D.C. 20549**

## FORM 4

### STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

[ ] 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**<sup>*</sup><br>Colombo Russell A<br><sub>(Last) (First) (Middle)</sub><br>504 REDWOOD BLVD., SUITE 100<br><sub>(Street)</sub><br>NOVATO, CA 94947<br><sub>(City) (State) (Zip)</sub> | **3. Date of Earliest Transaction (Month/Day/Year)**<br>2024-04-01 | **5. Relationship of Reporting Person(s) to Issuer**<br>(Check all applicable)<br>[X] Director [ ] 10% Owner<br>[ ] Officer (give title below) [ ] Other (specify below)<br>_ _ |
| **2. Issuer Name and Ticker or Trading Symbol**<br>Bank of Marin Bancorp [ BMRC ] | **4. If Amendment, Date of Original Filed (Month/Day/Year)**<br>  | **6. Individual or Joint/Group Filing (Check Applicable Line)**<br>[X] Form filed by One Reporting Person<br>[ ] Form filed by More than One Reporting Person |

---

## Table I - Non-Derivative Securities

---

|  |  |  |  |  |  |  |  |  |  |  |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1. Title of Security | 2. Transaction Date | 2A. Deemed Execution Date | 3. Transaction Code (V) | 3. Transaction Code (V) | 4. Securities Acquired (A) or Disposed of (D) | 4. Securities Acquired (A) or Disposed of (D) | 4. Securities Acquired (A) or Disposed of (D) | 5. Amount of Securities Beneficially Owned | 6. Ownership Form | 7. Nature of Indirect Beneficial Ownership |
| 1. Title of Security | 2. Transaction Date | 2A. Deemed Execution Date | Code | V | Amount | (A) or (D) | Price | 5. Amount of Securities Beneficially Owned | 6. Ownership Form | 7. Nature of Indirect Beneficial Ownership |
| Common Stock |  |  |  |  |  |  |  | 43560 | I | As Trustee of Colombo Family Trust |
| Common Stock |  |  |  |  |  |  |  | 2551 | D |  |
| Common Stock |  |  |  |  |  |  |  | 13692 | I | By IRA |

---

## Table II - Derivative Securities

---

|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1. Title of Derivative Security | 2. Conversion or Exercise Price | 3. Transaction Date | 3A. Deemed Execution Date | 4. Transaction Code (V) | 4. Transaction Code (V) | 5. Number of Derivative Securities Acquired (A) or Disposed of (D) | 5. Number of Derivative Securities Acquired (A) or Disposed of (D) | 6. Date Exercisable and Expiration Date | 6. Date Exercisable and Expiration Date | 7. Title and Amount of Underlying Securities | 7. Title and Amount of Underlying Securities | 8. Price of Derivative Security | 9. Number of Derivative Securities Beneficially Owned | 10. Ownership Form | 11. Nature of Indirect Beneficial Ownership |
| 1. Title of Derivative Security | 2. Conversion or Exercise Price | 3. Transaction Date | 3A. Deemed Execution Date | Code | V | (A) | (D) | Date Exercisable | Expiration Date | Title | Amount or Number of Shares | 8. Price of Derivative Security | 9. Number of Derivative Securities Beneficially Owned | 10. Ownership Form | 11. Nature of Indirect Beneficial Ownership |
| Stock Options (Right to Buy) | $22.94 | 2024-04-01 |  | H<sup>(1)</sup> |  |  | 8400 | 2019-04-01<sup>(2)</sup> | 2024-04-01 | Common Stock | 8400 | $0 | 0 | D |  |
| Stock Options (Right to Buy) | $25.38 | 2025-03-02 |  | H<sup>(3)</sup> |  |  | 14340 | 2018-03-02<sup>(4)</sup> | 2025-03-02 | Common Stock | 14340 | $0 | 0 | D |  |
| Stock Options (Right to Buy) | $24.83 | 2026-03-01 |  | H<sup>(5)</sup> |  |  | 14820 | 2019-03-01<sup>(4)</sup> | 2026-03-01 | Common Stock | 14820 | $0 | 0 | D |  |
| Stock Options (Right to Buy) | $34.80 |  |  |  |  |  |  | <sup>(4)</sup> | 2027-03-01 | Common Stock | 10360 |  | 10360 | D |  |
| Stock Options (Right to Buy) | $33.58 |  |  |  |  |  |  | <sup>(6)</sup> | 2028-03-01 | Common Stock | 5420 |  | 5420 | D |  |
| Stock Options (Right to Buy) | $33.58 |  |  |  |  |  |  | <sup>(4)</sup> | 2028-03-01 | Common Stock | 11540 |  | 11540 | D |  |
| Stock Options (Right to Buy) | $44.45 |  |  |  |  |  |  | <sup>(4)</sup> | 2029-03-01 | Common Stock | 10030 |  | 10030 | D |  |
| Stock Options (Right to Buy) | $40.10 |  |  |  |  |  |  | <sup>(4)</sup> | 2030-03-02 | Common Stock | 7430 |  | 7430 | D |  |
| Stock Options (Right to Buy) | $38.25 |  |  |  |  |  |  | <sup>(4)</sup> | 2031-03-01 | Common Stock | 4723 |  | 4723 | D |  |

---

### Footnotes:

(1) The stock option was granted on April 1, 2014 and vested in equal annual installments over five years, becoming fully exercisable on April 1, 2019.  The option expired unexercised on April 1, 2024.  This Form 4 is being filed late due to an administrative oversight.

(2) Exercisable 20% per year beginning on first anniversary date of grant.

(3) The stock option was granted on March 2, 2015 and vested in equal annual installments over three years, becoming fully exercisable on March 2, 2018. The option expired unexercised on March 2, 2025.  This Form 4 is being filed late due to an administrative oversight.

(4) Exercisable 33% per year beginning on first anniversary date of grant.

(5) The stock option was granted on March 1, 2016 and vested in equal annual installments over three years, becoming fully exercisable on March 1, 2019. The option expired unexercised on March 1, 2026.  This Form 4 is being filed late due to an administrative oversight.

(6) Exercisable 33% per year beginning on first anniversary date of grant.

**Signature:** /s/ Krissy Meyer, Attorney-in-Fact  
**Date:** 2026-05-06

### Remarks:

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.**