Wellington Management Group LLP Increases Stake in Bank of Marin Bancorp to 3.92%

Wellington Management Group LLP, along with its subsidiaries Wellington Group Holdings LLP and Wellington Investment Advisors Holdings LLP, filed a Schedule 13G/A on May 15, 2026, regarding their holdings in Bank of Marin Bancorp (BMRC). The filing indicates that as of March 31, 2026, the group collectively beneficially owns 632,000 shares of common stock, representing a 3.92% ownership stake in the company. This reflects an increase from a previous 0.0% position, as noted in the supplemental data. The reporting persons operate as parent holding companies, with the shares held of record by clients of various Wellington investment advisers, including Wellington Management Company LLP. The filing was made under Rule 13d-1(b), certifying that the securities were acquired in the ordinary course of business and not for the purpose of changing or influencing the control of the issuer. All shares are reported as having shared voting and dispositive power among the reporting entities.