MCHB

SEC source: 0001518715-25-000160 · wk-form4_1757036198.xml · nonDerivative · entry 2

EVANS GODFREY B · CIK 0001529623 · EVP - General Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 81,390

F1 · shares: Reflects shares of Issuer Class A common stock received upon vesting of performance stock units ("PSUs"). Pursuant to the Agreement and Plan of Merger, dated as of March 28, 2025, among HomeStreet, Inc., HomeStreet Bank, a subsidiary of HomeStreet, Inc., and Mechanics Bank, at the effective time of the merger on September 2, 2025, each outstanding PSU held by the Reporting Person was accelerated and entitled the Reporting Person to receive shares of Issuer Class A common stock, plus a cash amount for any accrued but unpaid dividends on the PSUs. In the merger, HomeStreet, Inc. was renamed Mechanics Bancorp.

F3 · price: Shares of Issuer Class A common stock were issued to the Reporting Person without payment of any consideration in connection with the vesting of a PSU award granted to the Reporting Person on January 1, 2024. The number of shares issued on the vesting of the PSU was determined based on the achievement of certain performance factors set forth in the PSU. The unvested portion of the PSU was cancelled.

SEC source: 0001518715-25-000160 · wk-form4_1757036198.xml · nonDerivative · entry 1

EVANS GODFREY B · CIK 0001529623 · EVP - General Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 72,535

F1 · shares: Reflects shares of Issuer Class A common stock received upon vesting of performance stock units ("PSUs"). Pursuant to the Agreement and Plan of Merger, dated as of March 28, 2025, among HomeStreet, Inc., HomeStreet Bank, a subsidiary of HomeStreet, Inc., and Mechanics Bank, at the effective time of the merger on September 2, 2025, each outstanding PSU held by the Reporting Person was accelerated and entitled the Reporting Person to receive shares of Issuer Class A common stock, plus a cash amount for any accrued but unpaid dividends on the PSUs. In the merger, HomeStreet, Inc. was renamed Mechanics Bancorp.

F2 · price: Shares of Issuer Class A common stock were issued to the Reporting Person without payment of any consideration in connection with the vesting of a PSU award granted to the Reporting Person on January 1, 2023. The number of shares issued on the vesting of the PSU was determined based on the achievement of certain performance factors set forth in the PSU. The unvested portion of the PSU was cancelled.

SEC source: 0001518715-25-000153 · wk-form4_1757035810.xml · nonDerivative · entry 4

ISEMAN JAY C · CIK 0001529667 · EVP - Chief Credit Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 93,329

F3 · shares: Shares withheld by the Issuer in payment of the withholding tax liability incurred upon the above-reported settlement of PSUs.

SEC source: 0001518715-25-000153 · wk-form4_1757035810.xml · nonDerivative · entry 3

ISEMAN JAY C · CIK 0001529667 · EVP - Chief Credit Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 95,538

F1 · shares: Reflects shares of Issuer Class A common stock received upon vesting of performance stock units ("PSUs"). Pursuant to the Agreement and Plan of Merger, dated as of March 28, 2025, among HomeStreet, Inc., HomeStreet Bank, a subsidiary of HomeStreet, Inc., and Mechanics Bank, at the effective time of the merger on September 2, 2025, each outstanding PSU held by the Reporting Person was accelerated and entitled the Reporting Person to receive shares of Issuer Class A common stock, plus a cash amount for any accrued but unpaid dividends on the PSUs. In the merger, HomeStreet, Inc. was renamed Mechanics Bancorp.

F4 · price: Shares of Issuer Class A common stock were issued to the Reporting Person without payment of any consideration in connection with the vesting of a PSU award granted to the Reporting Person on January 1, 2024. The number of shares issued on the vesting of the PSU was determined based on the achievement of certain performance factors set forth in the PSU. The unvested portion of the PSU was cancelled.

SEC source: 0001518715-25-000153 · wk-form4_1757035810.xml · nonDerivative · entry 2

ISEMAN JAY C · CIK 0001529667 · EVP - Chief Credit Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 87,369

F3 · shares: Shares withheld by the Issuer in payment of the withholding tax liability incurred upon the above-reported settlement of PSUs.

SEC source: 0001518715-25-000153 · wk-form4_1757035810.xml · nonDerivative · entry 1

ISEMAN JAY C · CIK 0001529667 · EVP - Chief Credit Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 88,058

F1 · shares: Reflects shares of Issuer Class A common stock received upon vesting of performance stock units ("PSUs"). Pursuant to the Agreement and Plan of Merger, dated as of March 28, 2025, among HomeStreet, Inc., HomeStreet Bank, a subsidiary of HomeStreet, Inc., and Mechanics Bank, at the effective time of the merger on September 2, 2025, each outstanding PSU held by the Reporting Person was accelerated and entitled the Reporting Person to receive shares of Issuer Class A common stock, plus a cash amount for any accrued but unpaid dividends on the PSUs. In the merger, HomeStreet, Inc. was renamed Mechanics Bancorp.

F2 · price: Shares of Issuer Class A common stock were issued to the Reporting Person without payment of any consideration in connection with the vesting of a PSU award granted to the Reporting Person on January 1, 2023. The number of shares issued on the vesting of the PSU was determined based on the achievement of certain performance factors set forth in the PSU. The unvested portion of the PSU was cancelled.

SEC source: 0001518715-25-000149 · wk-form4_1757035487.xml · nonDerivative · entry 2

VAN AMEN DARRELL · CIK 0001529709 · EVP, Chief Investment Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 92,870

F1 · shares: Reflects shares of Issuer Class A common stock received upon vesting of performance stock units ("PSUs"). Pursuant to the Agreement and Plan of Merger, dated as of March 28, 2025, among HomeStreet, Inc., HomeStreet Bank, a subsidiary of HomeStreet, Inc., and Mechanics Bank, at the effective time of the merger on September 2, 2025, each outstanding PSU held by the Reporting Person was accelerated and entitled the Reporting Person to receive shares of Issuer Class A common stock, plus a cash amount for any accrued but unpaid dividends on the PSUs. In the merger, HomeStreet, Inc. was renamed Mechanics Bancorp.

F3 · price: Shares of Issuer Class A common stock were issued to the Reporting Person without payment of any consideration in connection with the vesting of a PSU award granted to the Reporting Person on January 1, 2024. The number of shares issued on the vesting of the PSU was determined based on the achievement of certain performance factors set forth in the PSU. The unvested portion of the PSU was cancelled.

SEC source: 0001518715-25-000149 · wk-form4_1757035487.xml · nonDerivative · entry 1

VAN AMEN DARRELL · CIK 0001529709 · EVP, Chief Investment Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 83,021

F1 · shares: Reflects shares of Issuer Class A common stock received upon vesting of performance stock units ("PSUs"). Pursuant to the Agreement and Plan of Merger, dated as of March 28, 2025, among HomeStreet, Inc., HomeStreet Bank, a subsidiary of HomeStreet, Inc., and Mechanics Bank, at the effective time of the merger on September 2, 2025, each outstanding PSU held by the Reporting Person was accelerated and entitled the Reporting Person to receive shares of Issuer Class A common stock, plus a cash amount for any accrued but unpaid dividends on the PSUs. In the merger, HomeStreet, Inc. was renamed Mechanics Bancorp.

F2 · price: Shares of Issuer Class A common stock were issued to the Reporting Person without payment of any consideration in connection with the vesting of a PSU award granted to the Reporting Person on January 1, 2023. The number of shares issued on the vesting of the PSU was determined based on the achievement of certain performance factors set forth in the PSU. The unvested portion of the PSU was cancelled.

SEC source: 0001104659-25-088372 · tm2525563-3_4seq1.xml · nonDerivative · entry 2

WEBB CARL B · CIK 0001267958 · Director · 10% owner

10b5-1 filing: No plan indicated

Ownership: Indirect · By EB Acquisition Company II LLC

Disclosed balance after: 90,631,480

F2 · price: Received in exchange for 27,455 shares of MB original voting common stock in connection with the Merger. As consideration for the Merger, each share of MB voting common stock converted into the right to receive 3301.0920 shares of Issuer Class A common stock, which, on the effective date of the Merger, had a closing price of $13.87 per share.

F3 · ownership.nature: This statement is jointly filed by and on behalf of each of Mr. Carl B. Webb, EB Acquisition Company LLC ("EB"), EB Acquisition Company II LLC ("EB II "), Ford Financial Fund II, L.P. ("Fund II"), Ford Financial Fund III, L.P. ("Fund III"), Ford Management II, L.P. ("Management II"), Ford Management III, L.P. ("Management III") and Ford Ultimate Management II, LLC ("Ultimate Management"). EB and EB II are the direct beneficial owners of the securities covered by this statement.

F5 · ownership.nature: Fund III is the general partner of, and may be deemed to beneficially own certain securities owned by, EB II. Management III is the general partner of, and may be deemed to beneficially own certain securities owned by, Fund III. Ultimate Management is the general partner of, and may be deemed to beneficially own certain securities owned by, Management III. Mr. Webb is the sole manager of, and may be deemed to beneficially own certain securities owned by, Ultimate Management.

F6 · ownership.nature: The reporting persons state that neither the filing of this statement nor anything herein shall be deemed an admission that such persons are, for purposes of Section 16 of the Securities Exchange Act of 1934, as amended (the "Exchange Act") or otherwise, the beneficial owners of any securities covered by this statement. The reporting persons disclaim beneficial ownership of the securities covered by this statement, except to the extent of the pecuniary interest of such persons in such securities.

F7 · ownership.nature: The reporting persons may be deemed to be a member of a group with respect to the Issuer or securities of the Issuer for purposes of Section 13(d) or 13(g) of the Exchange Act. The reporting persons declare that neither the filing of this statement nor anything herein shall be construed as an admission that such persons are, for the purposes of Section 13(d) or 13(g) of the Exchange Act or any other purpose, a member of a group with respect to the Issuer or securities of the Issuer.

SEC source: 0001104659-25-088372 · tm2525563-3_4seq1.xml · nonDerivative · entry 1

WEBB CARL B · CIK 0001267958 · Director · 10% owner

10b5-1 filing: No plan indicated

Ownership: Indirect · By EB Acquisition Company LLC

Disclosed balance after: 81,134,239

F1 · price: Received in exchange for 24,578 shares of Mechanics Bank ("MB") original voting common stock in connection with the merger of MB with and into HomeStreet Bank, a wholly owned subsidiary of Mechanics Bancorp ("Issuer"), pursuant to which MB continued as the surviving corporation and as a wholly owned subsidiary of Issuer (the "Merger"). As consideration for the Merger, each share of MB voting common stock converted into the right to receive 3301.0920 shares of Issuer Class A common stock, which, on the effective date of the Merger, had a closing price of $13.87 per share.

F3 · ownership.nature: This statement is jointly filed by and on behalf of each of Mr. Carl B. Webb, EB Acquisition Company LLC ("EB"), EB Acquisition Company II LLC ("EB II "), Ford Financial Fund II, L.P. ("Fund II"), Ford Financial Fund III, L.P. ("Fund III"), Ford Management II, L.P. ("Management II"), Ford Management III, L.P. ("Management III") and Ford Ultimate Management II, LLC ("Ultimate Management"). EB and EB II are the direct beneficial owners of the securities covered by this statement.

F4 · ownership.nature: Fund II is the general partner of, and may be deemed to beneficially own certain securities owned by, EB. Management II is the general partner of, and may be deemed to beneficially own certain securities owned by, Fund II. Ultimate Management is the general partner of, and may be deemed to beneficially own certain securities owned by, Management II. Mr. Webb is the sole manager of, and may be deemed to beneficially own certain securities owned by, Ultimate Management.

F6 · ownership.nature: The reporting persons state that neither the filing of this statement nor anything herein shall be deemed an admission that such persons are, for purposes of Section 16 of the Securities Exchange Act of 1934, as amended (the "Exchange Act") or otherwise, the beneficial owners of any securities covered by this statement. The reporting persons disclaim beneficial ownership of the securities covered by this statement, except to the extent of the pecuniary interest of such persons in such securities.

F7 · ownership.nature: The reporting persons may be deemed to be a member of a group with respect to the Issuer or securities of the Issuer for purposes of Section 13(d) or 13(g) of the Exchange Act. The reporting persons declare that neither the filing of this statement nor anything herein shall be construed as an admission that such persons are, for the purposes of Section 13(d) or 13(g) of the Exchange Act or any other purpose, a member of a group with respect to the Issuer or securities of the Issuer.

SEC source: 0001518715-25-000190 · wk-form4a_1766078196.xml · nonDerivative · entry 4

MASON MARK K · CIK 0001396928 · Consultant

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 227,569

F5 · shares: This amendment is being filed to correct the number of shares withheld by the Issuer in payment of the withholding tax liability incurred upon the above-reported settlement of PSUs. It was previously reported that the Issuer withheld 14,434 shares of the Issuer Class A common stock upon vesting of a PSU award granted on January 1, 2024, when in fact the number of shares withheld was 13,117 shares.

SEC source: 0001518715-25-000190 · wk-form4a_1766078196.xml · nonDerivative · entry 3

MASON MARK K · CIK 0001396928 · Consultant

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 240,686

F1 · shares: Reflects shares of Issuer Class A common stock received upon vesting of performance stock units (PSUs"). Pursuant to the Agreement and Plan of Merger, dated as of March 28, 2025, among HomeStreet, Inc., HomeStreet Bank, a subsidiary of HomeStreet, Inc., and Mechanics Bank, at the effective time of the merger on September 2, 2025, each outstanding PSU held by the Reporting Person was accelerated and entitled the Reporting Person to receive shares of Issuer Class A common stock, plus a cash amount for any accrued by unpaid dividends on the PSUs. In the merger, HomeStreet, Inc. was renamed to Mechanics Bancorp.

F4 · price: Shares of Issuer Class A common stock were issued to the Reporting Person without payment of any consideration in connection with the vesting of a PSU award granted to the Reporting Person on January 1, 2024. The number of shares issued on the vesting of the PSU was determined based on the achievement of certain performance factors set forth in the PSU. The unvested portion of the PSU was cancelled.

SEC source: 0001518715-25-000190 · wk-form4a_1766078196.xml · nonDerivative · entry 2

MASON MARK K · CIK 0001396928 · Consultant

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 207,353

F3 · shares: This amendment is being filed to correct the number of shares withheld by the Issuer in payment of the withholding tax liability incurred upon the above-reported settlement of PSUs. It was previously reported that the Issuer withheld 6,430 shares of the Issuer Class A common stock upon vesting of a PSU award granted on January 1, 2023, when in fact the number of shares withheld was 5,843 shares.

SEC source: 0001518715-25-000190 · wk-form4a_1766078196.xml · nonDerivative · entry 1

MASON MARK K · CIK 0001396928 · Consultant

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 213,196

F1 · shares: Reflects shares of Issuer Class A common stock received upon vesting of performance stock units (PSUs"). Pursuant to the Agreement and Plan of Merger, dated as of March 28, 2025, among HomeStreet, Inc., HomeStreet Bank, a subsidiary of HomeStreet, Inc., and Mechanics Bank, at the effective time of the merger on September 2, 2025, each outstanding PSU held by the Reporting Person was accelerated and entitled the Reporting Person to receive shares of Issuer Class A common stock, plus a cash amount for any accrued by unpaid dividends on the PSUs. In the merger, HomeStreet, Inc. was renamed to Mechanics Bancorp.

F2 · price: Shares of Issuer Class A common stock were issued to the Reporting Person without payment of any consideration in connection with the vesting of a PSU award granted to the Reporting Person on January 1, 2023. The number of shares issued on the vesting of the PSU was determined based on the achievement of certain performance factors set forth in the PSU. The unvested portion of the PSU was cancelled.

SEC source: 0001509989-26-000002 · wk-form4_1767660290.xml · derivative · entry 5

Givans Scott A. · CIK 0001509989 · EVP & Chief Credit Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 12,493

Underlying: Class A Common Stock · 12,493 shares

Expires not disclosed

F2 · derivative.exercise_price: 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.

F3 · derivative.exercise_price: Each incentive unit is the economic equivalent of one share of Issuer Class A Common Stock.

F6 · derivative.exercise_date: The incentive units vest in three equal annual installments beginning February 15, 2026.

F6 · derivative.expiration_date: The incentive units vest in three equal annual installments beginning February 15, 2026.

SEC source: 0001509989-26-000002 · wk-form4_1767660290.xml · derivative · entry 4

Givans Scott A. · CIK 0001509989 · EVP & Chief Credit Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 69,671

Underlying: Class A Common Stock · 68,680 shares

Expires not disclosed

F2 · derivative.exercise_price: 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.

F3 · derivative.exercise_price: Each incentive unit is the economic equivalent of one share of Issuer Class A Common Stock.

F4 · derivative.exercise_date: 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.

F4 · derivative.expiration_date: 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.

F5 · balance_after: Includes 991 incentive units acquired on December 15, 2025 pursuant to dividend reinvestment.

SEC source: 0001509989-26-000002 · wk-form4_1767660290.xml · nonDerivative · entry 1

Givans Scott A. · CIK 0001509989 · EVP & Chief Credit Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 14,682

F1 · price: Received in exchange for an aggregate of 4.45 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").

F2 · price: 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.

SEC source: 0001602088-26-000002 · wk-form4_1767660532.xml · derivative · entry 5

Duda Nathan · CIK 0001602088 · EVP & CFO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 13,117

Underlying: Class A Common Stock · 13,117 shares

Expires not disclosed

F2 · derivative.exercise_price: 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.

F3 · derivative.exercise_price: Each incentive unit is the economic equivalent of one share of Issuer Class A Common Stock.

F6 · derivative.exercise_date: The incentive units vest in three equal annual installments beginning February 15, 2026.

F6 · derivative.expiration_date: The incentive units vest in three equal annual installments beginning February 15, 2026.

SEC source: 0001602088-26-000002 · wk-form4_1767660532.xml · derivative · entry 4

Duda Nathan · CIK 0001602088 · EVP & CFO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 106,433

Underlying: Class A Common Stock · 104,920 shares

Expires not disclosed

F2 · derivative.exercise_price: 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.

F3 · derivative.exercise_price: Each incentive unit is the economic equivalent of one share of Issuer Class A Common Stock.

F4 · derivative.exercise_date: 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.

F4 · derivative.expiration_date: 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.

F5 · balance_after: Includes 1,513 incentive units acquired on December 15, 2025 pursuant to dividend reinvestment.

SEC source: 0001602088-26-000002 · wk-form4_1767660532.xml · nonDerivative · entry 1

Duda Nathan · CIK 0001602088 · EVP & CFO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 14,682

F1 · price: Received in exchange for 4.45 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").

F2 · price: 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.

SEC source: 0002102022-26-000004 · wk-form4_1767660456.xml · derivative · entry 5

Kallingal Tony P · CIK 0002102022 · EVP & Chief Banking Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 13,742

Underlying: Class A Common Stock · 13,742 shares

Expires not disclosed

F2 · derivative.exercise_price: 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.

F3 · derivative.exercise_price: Each incentive unit is the economic equivalent of one share of Issuer Class A Common Stock.

F6 · derivative.exercise_date: The incentive units vest in three equal annual installments beginning February 15, 2026.

F6 · derivative.expiration_date: The incentive units vest in three equal annual installments beginning February 15, 2026.

SEC source: 0002102022-26-000004 · wk-form4_1767660456.xml · derivative · entry 4

Kallingal Tony P · CIK 0002102022 · EVP & Chief Banking Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 38,765

Underlying: Class A Common Stock · 38,214 shares

Expires not disclosed

F2 · derivative.exercise_price: 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.

F3 · derivative.exercise_price: Each incentive unit is the economic equivalent of one share of Issuer Class A Common Stock.

F4 · derivative.exercise_date: 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.

F4 · derivative.expiration_date: 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.

F5 · balance_after: Includes 551 incentive units acquired on December 15, 2025 pursuant to dividend reinvestment.

SEC source: 0002102022-26-000004 · wk-form4_1767660456.xml · nonDerivative · entry 1

Kallingal Tony P · CIK 0002102022 · EVP & Chief Banking Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 10,216

F1 · price: Received in exchange for an aggregate of 3.09 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").

F2 · price: 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.

SEC source: 0002102020-26-000004 · wk-form4_1767660222.xml · derivative · entry 4

Pelayo Fernando · CIK 0002102020 · EVP & Chief Accounting Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 7,518

Underlying: Class A Common Stock · 7,518 shares

Expires not disclosed

F1 · derivative.exercise_price: As consideration in the merger of HomeStreet Bank, a wholly owned subsidiary of Issuer, with and into Mechanics Bank ("MB"), pursuant to the which MB continued as the surviving corporation and as a wholly owned subsidiary of Issuer (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.

F2 · derivative.exercise_price: Each incentive unit is the economic equivalent of one share of Issuer Class A Common Stock.

F5 · derivative.exercise_date: The incentive units vest in three equal annual installments beginning February 15, 2026.

F5 · derivative.expiration_date: The incentive units vest in three equal annual installments beginning February 15, 2026.

SEC source: 0002102020-26-000004 · wk-form4_1767660222.xml · derivative · entry 3

Pelayo Fernando · CIK 0002102020 · EVP & Chief Accounting Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 65,919

Underlying: Class A Common Stock · 64,982 shares

Expires not disclosed

F1 · derivative.exercise_price: As consideration in the merger of HomeStreet Bank, a wholly owned subsidiary of Issuer, with and into Mechanics Bank ("MB"), pursuant to the which MB continued as the surviving corporation and as a wholly owned subsidiary of Issuer (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.

F2 · derivative.exercise_price: Each incentive unit is the economic equivalent of one share of Issuer Class A Common Stock.

F3 · derivative.exercise_date: 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.

F3 · derivative.expiration_date: 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.

F4 · balance_after: Includes 937 incentive units acquired on December 15, 2025 pursuant to dividend reinvestment.

SEC source: 0002103476-26-000002 · wk-form4_1767660354.xml · derivative · entry 4

Pierce Christopher D · CIK 0002103476 · EVP & Chief Operating Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 13,742

Underlying: Class A Common Stock · 13,742 shares

Expires not disclosed

F2 · derivative.exercise_price: 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.

F3 · derivative.exercise_price: Each incentive unit is the economic equivalent of one share of Issuer Class A Common Stock.

F4 · derivative.exercise_date: The incentive units vest in three equal annual installments beginning February 15, 2026.

F4 · derivative.expiration_date: The incentive units vest in three equal annual installments beginning February 15, 2026.

SEC source: 0002103476-26-000002 · wk-form4_1767660354.xml · nonDerivative · entry 1

Pierce Christopher D · CIK 0002103476 · EVP & Chief Operating Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 11,262

F1 · price: Received in exchange for an aggregate of 3.41 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").

F2 · price: 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.

SEC source: 0002103004-26-000002 · wk-form4_1767660083.xml · derivative · entry 5

Shields Kristie S · CIK 0002103004 · EVP & Chief Compliance Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 8,745

Underlying: Class A Common Stock · 8,745 shares

Expires not disclosed

F1 · derivative.exercise_price: As consideration in the merger of HomeStreet Bank, a wholly owned subsidiary of Issuer, with and into Mechanics Bank ("MB"), pursuant to the which MB continued as the surviving corporation and as a wholly owned subsidiary of Issuer (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.

F2 · derivative.exercise_price: Each incentive unit is the economic equivalent of one share of Issuer Class A Common Stock.

F5 · derivative.exercise_date: The incentive units vest in three equal annual installments beginning February 15, 2026.

F5 · derivative.expiration_date: The incentive units vest in three equal annual installments beginning February 15, 2026.

SEC source: 0002103004-26-000002 · wk-form4_1767660083.xml · derivative · entry 4

Shields Kristie S · CIK 0002103004 · EVP & Chief Compliance Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 3,922

Underlying: Class A Common Stock · 3,922 shares

Expires not disclosed

F1 · derivative.exercise_price: As consideration in the merger of HomeStreet Bank, a wholly owned subsidiary of Issuer, with and into Mechanics Bank ("MB"), pursuant to the which MB continued as the surviving corporation and as a wholly owned subsidiary of Issuer (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.

F2 · derivative.exercise_price: Each incentive unit is the economic equivalent of one share of Issuer Class A Common Stock.

F4 · derivative.exercise_date: The incentive units vest in two equal annual installments beginning February 15, 2026.

F4 · derivative.expiration_date: The incentive units vest in two equal annual installments beginning February 15, 2026.

SEC source: 0002103004-26-000002 · wk-form4_1767660083.xml · derivative · entry 3

Shields Kristie S · CIK 0002103004 · EVP & Chief Compliance Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 3,398

Underlying: Class A Common Stock · 3,398 shares

Expires not disclosed

F1 · derivative.exercise_price: As consideration in the merger of HomeStreet Bank, a wholly owned subsidiary of Issuer, with and into Mechanics Bank ("MB"), pursuant to the which MB continued as the surviving corporation and as a wholly owned subsidiary of Issuer (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.

F2 · derivative.exercise_price: Each incentive unit is the economic equivalent of one share of Issuer Class A Common Stock.

F3 · derivative.exercise_date: The incentive units vest on February 15, 2026.

F3 · derivative.expiration_date: The incentive units vest on February 15, 2026.

SEC source: 0002102635-26-000002 · wk-form4_1767659968.xml · derivative · entry 6

Shrader Glenn C · CIK 0002102635 · EVP & General Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 7,495

Underlying: Class A Common Stock · 7,495 shares

Expires not disclosed

F1 · derivative.exercise_price: As consideration in the merger of HomeStreet Bank, a wholly owned subsidiary of Issuer, with and into Mechanics Bank ("MB"), pursuant to the which MB continued as the surviving corporation and as a wholly owned subsidiary of Issuer (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.

F2 · derivative.exercise_price: Each incentive unit is the economic equivalent of one share of Issuer Class A Common Stock.

F7 · derivative.exercise_date: The incentive units vest in three equal annual installments beginning February 15, 2026.

F7 · derivative.expiration_date: The incentive units vest in three equal annual installments beginning February 15, 2026.

SEC source: 0002102635-26-000002 · wk-form4_1767659968.xml · derivative · entry 5

Shrader Glenn C · CIK 0002102635 · EVP & General Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 3,439

Underlying: Class A Common Stock · 3,439 shares

Expires not disclosed

F1 · derivative.exercise_price: As consideration in the merger of HomeStreet Bank, a wholly owned subsidiary of Issuer, with and into Mechanics Bank ("MB"), pursuant to the which MB continued as the surviving corporation and as a wholly owned subsidiary of Issuer (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.

F2 · derivative.exercise_price: Each incentive unit is the economic equivalent of one share of Issuer Class A Common Stock.

F6 · derivative.exercise_date: The incentive units vest in two equal annual installments beginning February 15, 2026.

F6 · derivative.expiration_date: The incentive units vest in two equal annual installments beginning February 15, 2026.

SEC source: 0002102635-26-000002 · wk-form4_1767659968.xml · derivative · entry 4

Shrader Glenn C · CIK 0002102635 · EVP & General Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 2,980

Underlying: Class A Common Stock · 2,980 shares

Expires not disclosed

F1 · derivative.exercise_price: As consideration in the merger of HomeStreet Bank, a wholly owned subsidiary of Issuer, with and into Mechanics Bank ("MB"), pursuant to the which MB continued as the surviving corporation and as a wholly owned subsidiary of Issuer (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.

F2 · derivative.exercise_price: Each incentive unit is the economic equivalent of one share of Issuer Class A Common Stock.

F5 · derivative.exercise_date: The incentive units vest on February 15, 2026.

F5 · derivative.expiration_date: The incentive units vest on February 15, 2026.

SEC source: 0002102635-26-000002 · wk-form4_1767659968.xml · derivative · entry 3

Shrader Glenn C · CIK 0002102635 · EVP & General Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 19,733

Underlying: Class A Common Stock · 19,452 shares

Expires not disclosed

F1 · derivative.exercise_price: As consideration in the merger of HomeStreet Bank, a wholly owned subsidiary of Issuer, with and into Mechanics Bank ("MB"), pursuant to the which MB continued as the surviving corporation and as a wholly owned subsidiary of Issuer (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.

F2 · derivative.exercise_price: Each incentive unit is the economic equivalent of one share of Issuer Class A Common Stock.

F3 · derivative.exercise_date: 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.

F3 · derivative.expiration_date: 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.

F4 · balance_after: Includes 281 incentive units acquired on December 15, 2025 pursuant to dividend reinvestment.

SEC source: 0001518715-26-000015 · wk-form4_1770159114.xml · derivative · entry 2

Crowe Adrienne Y · CIK 0002103504 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 2,591

Underlying: Class A Common Stock · 2,554 shares

Expires not disclosed

F2 · derivative.exercise_price: 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.

F3 · derivative.exercise_price: Each incentive unit is the economic equivalent of one share of Issuer Class A Common Stock.

F4 · derivative.exercise_date: 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.

F4 · derivative.expiration_date: 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.

F5 · balance_after: Includes 37 incentive units acquired on December 15, 2025 pursuant to dividend reinvestment.

SEC source: 0001518715-26-000015 · wk-form4_1770159114.xml · nonDerivative · entry 1

Crowe Adrienne Y · CIK 0002103504 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 13,204

F1 · price: 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").

F2 · price: 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.

SEC source: 0002105535-26-000004 · wk-form4_1770159239.xml · derivative · entry 2

Wilcox Jon R · CIK 0002105535 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 2,591

Underlying: Class A Common Stock · 2,554 shares

Expires not disclosed

F2 · derivative.exercise_price: 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.

F3 · derivative.exercise_price: Each incentive unit is the economic equivalent of one share of Issuer Class A Common Stock.

F4 · derivative.exercise_date: 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.

F4 · derivative.expiration_date: 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.

F5 · balance_after: Includes 37 incentive units acquired on December 15, 2025 pursuant to dividend reinvestment.

SEC source: 0002105535-26-000004 · wk-form4_1770159239.xml · nonDerivative · entry 1

Wilcox Jon R · CIK 0002105535 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 13,204

F1 · price: 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").

F2 · price: 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.

SEC source: 0001518715-26-000013 · wk-form4_1770158882.xml · derivative · entry 2

Cochran Patricia · CIK 0002104575 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 2,591

Underlying: Class A Common Stock · 2,554 shares

Expires not disclosed

F2 · derivative.exercise_price: 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.

F3 · derivative.exercise_price: Each incentive unit is the economic equivalent of one share of Issuer Class A Common Stock.

F4 · derivative.exercise_date: 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.

F4 · derivative.expiration_date: 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.

F5 · balance_after: Includes 37 incentive units acquired on December 15, 2025 pursuant to dividend reinvestment.

SEC source: 0001518715-26-000013 · wk-form4_1770158882.xml · nonDerivative · entry 1

Cochran Patricia · CIK 0002104575 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 13,204

F1 · price: 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").

F2 · price: 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.

SEC source: 0002104239-26-000004 · wk-form4_1771895297.xml · derivative · entry 8

Downer Edward Michael · CIK 0002104239 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 2,591

Underlying: Class A Common Stock · 2,554 shares

Expires not disclosed

F2 · derivative.exercise_price: 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.

F9 · derivative.exercise_price: Each incentive unit is the economic equivalent of one share of Issuer Class A Common Stock.

F10 · derivative.exercise_date: 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.

F10 · derivative.expiration_date: 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.

F11 · balance_after: Includes 37 incentive units acquired on December 15, 2025 pursuant to dividend reinvestment.

SEC source: 0002104239-26-000004 · wk-form4_1771895297.xml · nonDerivative · entry 7

Downer Edward Michael · CIK 0002104239 · Director

10b5-1 filing: No plan indicated

Ownership: Indirect · E M Downer Family Dynasty II Trust 12/28/03

Disclosed balance after: 79,226

F2 · price: 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.

F8 · price: Received in exchange of 23 shares of MB original voting common stock in connection with the Merger. The Reporting Person is the voting trustee for the E M Downer Family Dynasty II Trust dated 12/28/03.

F8 · ownership.nature: Received in exchange of 23 shares of MB original voting common stock in connection with the Merger. The Reporting Person is the voting trustee for the E M Downer Family Dynasty II Trust dated 12/28/03.

SEC source: 0002104239-26-000004 · wk-form4_1771895297.xml · nonDerivative · entry 6

Downer Edward Michael · CIK 0002104239 · Director

10b5-1 filing: No plan indicated

Ownership: Indirect · Robert M Downer Family Dynasty Trust

Disclosed balance after: 1,121,270

F2 · price: 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.

F7 · price: Received in exchange of 339 shares of MB original voting common stock in connection with the Merger. The Reporting Person is the voting trustee for the Robert M Downer Family Dynasty Trust.

F7 · ownership.nature: Received in exchange of 339 shares of MB original voting common stock in connection with the Merger. The Reporting Person is the voting trustee for the Robert M Downer Family Dynasty Trust.

SEC source: 0002104239-26-000004 · wk-form4_1771895297.xml · nonDerivative · entry 5

Downer Edward Michael · CIK 0002104239 · Director

10b5-1 filing: No plan indicated

Ownership: Indirect · Douglas Downer Family Dynasty Trust

Disclosed balance after: 1,121,270

F2 · price: 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.

F6 · price: Received in exchange of 339 shares of MB original voting common stock in connection with the Merger. The Reporting Person is the voting trustee for the Douglas Downer Family Dynasty Trust.

F6 · ownership.nature: Received in exchange of 339 shares of MB original voting common stock in connection with the Merger. The Reporting Person is the voting trustee for the Douglas Downer Family Dynasty Trust.

SEC source: 0002104239-26-000004 · wk-form4_1771895297.xml · nonDerivative · entry 4

Downer Edward Michael · CIK 0002104239 · Director

10b5-1 filing: No plan indicated

Ownership: Indirect · E. Michael Downer, Investment Manager for MJAK Holdings, LLC

Disclosed balance after: 1,155,382

F2 · price: 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.

F5 · price: Received in exchange of 349 shares of MB original voting common stock in connection with the Merger. The Reporting Person is the Investment Manager of MJAK Holdings, LLC and has the power to direct the voting of such shares.

F5 · ownership.nature: Received in exchange of 349 shares of MB original voting common stock in connection with the Merger. The Reporting Person is the Investment Manager of MJAK Holdings, LLC and has the power to direct the voting of such shares.

SEC source: 0002104239-26-000004 · wk-form4_1771895297.xml · nonDerivative · entry 3

Downer Edward Michael · CIK 0002104239 · Director

10b5-1 filing: No plan indicated

Ownership: Indirect · E M Downer Dynasty Trust UAD 11/28/03 FBO Michael Downer

Disclosed balance after: 1,121,270

F2 · price: 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.

F4 · price: Received in exchange of 339 shares of MB original voting common stock in connection with the Merger. The Reporting Person is the investment manager and beneficiary of the E M Downer Dynasty Trust UAD 11/28/03.

F4 · ownership.nature: Received in exchange of 339 shares of MB original voting common stock in connection with the Merger. The Reporting Person is the investment manager and beneficiary of the E M Downer Dynasty Trust UAD 11/28/03.

SEC source: 0002104239-26-000004 · wk-form4_1771895297.xml · nonDerivative · entry 2

Downer Edward Michael · CIK 0002104239 · Director

10b5-1 filing: No plan indicated

Ownership: Indirect · E. Michael Downer, Trustee of the E. Michael Downer Separate Property Trust UTD 9/22/08

Disclosed balance after: 1,508,597

F2 · price: 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.

F3 · price: Received in exchange of 456 shares of MB original voting common stock in connection with the Merger. The Reporting Person is Trustee of the E. Michael Downer Separate Property Trust UTD 9/22/08.

F3 · ownership.nature: Received in exchange of 456 shares of MB original voting common stock in connection with the Merger. The Reporting Person is Trustee of the E. Michael Downer Separate Property Trust UTD 9/22/08.

SEC source: 0002104239-26-000004 · wk-form4_1771895297.xml · nonDerivative · entry 1

Downer Edward Michael · CIK 0002104239 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 13,204

F1 · price: 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").

F2 · price: 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.

SEC source: 0001518715-26-000028 · wk-form4_1774286364.xml · derivative · entry 5

Downer Douglas E · CIK 0002104981 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 2,591

Underlying: Class A Common Stock · 2,554 shares

Expires not disclosed

F2 · derivative.exercise_price: 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.

F6 · derivative.exercise_price: Each incentive unit is the economic equivalent of one share of Issuer Class A Common Stock.

F7 · derivative.exercise_date: 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.

F7 · derivative.expiration_date: 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.

F8 · balance_after: Includes 37 dividend equivalent incentive units acquired on December 15, 2025.

SEC source: 0001518715-26-000028 · wk-form4_1774286364.xml · nonDerivative · entry 2

Downer Douglas E · CIK 0002104981 · Director

10b5-1 filing: No plan indicated

Ownership: Indirect · Douglas Downer Family Dynasty Trust

Disclosed balance after: 1,121,270

F2 · price: 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.

F3 · price: Received in exchange of 339 shares of MB original voting common stock in connection with the Merger. E. Michael Downer is the voting trustee for the Douglas Downer Family Dynasty Trust.

F3 · ownership.nature: Received in exchange of 339 shares of MB original voting common stock in connection with the Merger. E. Michael Downer is the voting trustee for the Douglas Downer Family Dynasty Trust.