X0508 4 2025-09-02 0 0001518715 Mechanics Bancorp MCHB 0002105535 Wilcox Jon R 1111 CIVIC DR STE 390 WALNUT CREEK CA 94596-3895 1 0 0 0 0 Class A Common Stock 2025-09-02 4 A 0 13204 A 13204 D Incentive Units - Deferred 2025-09-02 4 A 0 2554 0 A Class A Common Stock 2554 2591 D Received in exchange for an aggregate of four shares of Mechanics Bank ("MB") original voting common stock and MB restricted stock units in connection with the merger of HomeStreet Bank, a wholly owned subsidiary of Issuer, with and into MB, pursuant to which MB continued as the surviving corporation and as a wholly owned subsidiary of Issuer (the "Merger"). As consideration for the Merger, (i) each share of MB voting common stock converted into the right to receive 3,301.0920 shares of Issuer Class A Common Stock, which, on the effective date of the Merger, had a closing price of $13.87 per share, (ii) each MB restricted stock unit of the Reporting Person converted into restricted stock units of Issuer for the right to receive 3,301.0920 shares of Issuer Class A Common Stock, and (iii) each MB incentive unit of the Reporting Person converted into incentive units of Issuer of the economic equivalent of 3,301.0920 shares of Issuer Class A Common Stock. Each incentive unit is the economic equivalent of one share of Issuer Class A Common Stock. The Reporting Person has elected to defer payment on such incentive units until the earlier of (i) the retirement or termination of the Reporting Person, or (ii) a change in control of Issuer. Includes 37 incentive units acquired on December 15, 2025 pursuant to dividend reinvestment. /s/ Glenn Shrader, Attorney in fact for Jon R. Wilcox 2026-02-03