Company: MCHB
Filing Date: 2025-08-07
Form Type: 425
Source: 0001518715-25-000116
Chunk: 2

Company: Mechanics Bancorp
Filing Date: 2025-08-07
Form: 425
Chunk 2
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 comply fully with applicable law. However, in order to avoid nuisance, cost and distraction, and to preclude any efforts to delay the closing of the proposed transaction, HomeStreet has determined to voluntarily supplement the Registration Statement and Proxy Statement/Prospectus/Consent Solicitation Statement with the supplemental disclosures set forth below. Nothing in the supplemental disclosures shall be deemed an admission of the legal necessity or materiality under applicable laws of any of the disclosures set forth herein or in the Registration Statement or Proxy Statement/Prospectus/Consent Solicitation Statement. To the contrary, HomeStreet specifically denies all allegations that any additional disclosure was or is required.

These supplemental disclosures will not change the consideration to be delivered in connection with the proposed transaction or the timing of the HomeStreet shareholder meeting to be held via webcast at www.virtualshareholdermeeting.com/HMST2025SM on August 21, 2025 at 10:00 AM Pacific Time.

#### The HomeStreet board of directors
continues to unanimously recommend that you vote “FOR” the proposals to be voted on at the HomeStreet shareholder meeting described in the Proxy Statement/Prospectus/Consent Solicitation Statement.

<div align='center'>Supplemental Disclosures to the Proxy Statement/Prospectus/Consent Solicitation Statement in Connection with the Shareholder Letters and Complaints</div>

The supplemental disclosures should be read in conjunction with the disclosures contained in the Proxy Statement/Prospectus/Consent Solicitation Statement, which in turn should be read in its entirety. All page references are to the Proxy Statement/Prospectus/Consent Solicitation Statement and terms used below, unless otherwise defined, shall have the meanings ascribed to such terms in the Proxy Statement/Prospectus/Consent Solicitation Statement. Where a disclosure has been amended and restated in part, bold and underlined text indicates language that has been inserted, and bold and strikethrough text indicates language that has been deleted. To the extent that the

information in this Form 8-K differs from or updates information contained in the Registration Statement or Proxy Statement/Prospectus/Consent Solicitation Statement, the information in this Form 8-K shall supersede or supplement the information in the Registration Statement and Proxy Statement/Prospectus/Consent Solicitation Statement.

1. The disclosure under “Opinion of HomeStreet’s Financial Advisor” on page 149 of the Proxy Statement/Prospectus/Consent Solicitation Statement is hereby supplemented by making the