Company: MCHB
Filing Date: 2025-07-16
Form Type: 424B3
Source: 0001140361-25-026051
Chunk: 505

Company: Mechanics Bancorp
Filing Date: 2025-07-16
Form: 424B3
Chunk 505
---
 or thereto, to the extent signed and delivered by means of a facsimile machine or by e-mail delivery of a “.pdf” format data file, shall be treated in all manner and respects as an original agreement or instrument and shall be considered to have the same binding legal effect as if it were the original signed version thereof delivered in person. No Party hereto or to any such agreement or instrument shall raise the use of a facsimile machine or e-mail delivery of a “.pdf” format data file to deliver a signature to this Agreement or any amendment to this Agreement or the fact that any signature or agreement or instrument was transmitted or communicated through the use of a facsimile machine or e-mail delivery of a “.pdf” format data file as a defense to the formation of a contract and each Party forever waives any such defense.

<div align='center'>[ Signature Page Follows ]

A-57</div>

#### TABLE OF CONTENTS
IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be executed by their respective officers thereunto duly authorized as of the date first above written.

Mechanics Bank

By: /s/ Carl B. Webb

Name: Carl B. Webb

Title: Chairman of the Board of Directors

HomeStreet, Inc.

By: /s/ Mark Mason

Name: Mark Mason

Title: Chairman & CEO

HomeStreet Bank

By: /s/ Mark Mason

Name: Mark Mason

Title: Chairman & CEO

<div align='center'>[ Signature Page to Agreement and Plan of Merger ]

A-58</div>

#### TABLE OF CONTENTS

#### Exhibit A-1

#### Form of Support Agreement
EXECUTION VERSION

### VOTING AND SUPPORT AGREEMENT
This VOTING AND SUPPORT AGREEMENT, dated as of March 28, 2025 (this “ Agreement ”), is made by and among (1) HomeStreet, Inc., a Washington corporation (“ Parent ”), (2) [•] (together, the “ Acquisition Entities ”) and (3) [•] (together, the “ Fund Entities ”) (together, the “ Parties ” and each a “ Party ”).

### W I T N E S E T H
WHEREAS, on March 28, 2025, Parent, HomeStreet Bank, a Washington state-chartered commercial bank and a direct and wholly owned subsidiary of Parent (“ Parent Bank ”), and Mechanics Bank (“ Company ”) entered