Company: MCHB
Filing Date: 2025-07-16
Form Type: 424B3
Source: 0001140361-25-026051
Chunk: 0

Company: Mechanics Bancorp
Filing Date: 2025-07-16
Form: 424B3
Chunk 0
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#### TABLE OF CONTENTS

#### Filed Pursuant to Rule 424(b)(3)

#### Registration No. 333-288528
<div align='center'>MERGER PROPOSED—YOUR VOTE IS VERY IMPORTANT</div>

To the Shareholders of HomeStreet, Inc.:

**On behalf of the board of directors of HomeStreet, Inc. (“HomeStreet”), we are pleased to enclose the accompanying proxy statement/prospectus/consent solicitation statement relating to, among other matters, the proposed combination of Mechanics Bank, a California banking corporation (“Mechanics”), and HomeStreet. We are requesting that you take certain actions as a holder of HomeStreet common stock.

On March 28, 2025, HomeStreet, HomeStreet Bank, a Washington state-chartered commercial bank and wholly owned subsidiary of HomeStreet (“HomeStreet Bank”), and Mechanics entered into an Agreement and Plan of Merger (as may be amended, modified or supplemented from time to time in accordance with its terms, the “merger agreement”) providing for an all-stock business combination between HomeStreet and Mechanics. On the terms and subject to the conditions set forth in the merger agreement, HomeStreet Bank will merge with and into Mechanics (the “merger”), with Mechanics surviving the merger and becoming a wholly owned subsidiary of HomeStreet (HomeStreet, as the resulting holding company of Mechanics following the merger, the “combined company”). In connection with the merger, HomeStreet will be renamed “Mechanics Bancorp”. Following the consummation of the merger, HomeStreet will remain a publicly traded company.

Upon the terms and subject to the conditions set forth in the merger agreement, at the effective time of the merger (the “effective time”) each share of common stock, par value $50 per share, of Mechanics designated as voting common stock (the “Mechanics voting common stock”) issued and outstanding immediately prior to the effective time, subject to certain exceptions, will be converted into the right to receive 3,301.0920 shares (the “Class A exchange ratio”) of Class A common stock, no par value, of the combined company (the “Class A common stock”). All existing shares of HomeStreet common stock currently authorized and held by HomeStreet shareholders (the “HomeStreet common stock”) will be redesignated as Class A common stock at the effective time pursuant to the amended and restated articles of incorporation of the combined company (the “articles amendment”) that will be adopted in connection with the merger. Further,