Company: MCHB
Filing Date: 2025-07-16
Form Type: 424B3
Source: 0001140361-25-026051
Chunk: 550

Company: Mechanics Bancorp
Filing Date: 2025-07-16
Form: 424B3
Chunk 550
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TABLE OF CONTENTS

IN WITNESS WHEREOF, the undersigned has executed this Written Consent on the date set forth below.

| [CONSENTING HOLDER] |     |        |
| By:                 |     |        |
|                     |     | Name:  |
|                     |     | Title: |
| Date:               |     |        |

A-96

TABLE OF CONTENTS

Annex A Consenting Holder Shares

| Shares of Common Stock |
| [•]                    |

A-97

#### TABLE OF CONTENTS

#### Annex B

#### Merger Agreement
<div align='center'>A-98</div>

#### TABLE OF CONTENTS

#### Exhibit B

#### Form of Parent Articles Amendment
<div align='center'>A-99</div>

#### TABLE OF CONTENTS

### FORM OF

### FOURTH AMENDED AND RESTATED ARTICLES OF INCORPORATION

#### OF

### MECHANICS BANCORP

## ARTICLE 1. NAME
The name of the corporation is Mechanics Bancorp (the “

#### corporation
”).

## ARTICLE 2. STOCK, VOTING RIGHTS
2.1

### AUTHORIZED SHARES
. The corporation shall have authority to issue 1,900,000,000 shares of common stock and 120,000 shares of preferred stock. The shares of common stock shall consist of and be divided into two classes, 1,897,500,000 shares of which shall be designated Class A Common Stock having no par value (“

#### Class A Common Stock
”) and 2,500,000 shares of which shall be designated Class B Common Stock having no par value (“

#### Class B Common Stock
”). For the avoidance of doubt, the shares of common stock authorized by the Third Amended and Restated Articles of Incorporation, dated as of July 25, 2019, are the “Class A Common Stock.”

2.1.1. Rights of Common Shares . Except as expressly provided in this Article 2 , the rights, preferences, limitations and voting powers of the Class A Common Stock and Class B Common Stock shall be in all respects and for all purposes and in all circumstances absolutely and completely identical; provided , if the corporation shall in any manner split, subdivide or combine the outstanding shares of Class A Common Stock or Class B Common Stock, the outstanding shares of the other class shall likewise be split, subdivided or combined in the same manner proportionately and on the same basis per