Company: MCHB
Filing Date: 2025-09-02
Form Type: POS AM
Source: 0001140361-25-033636
Chunk: 0

Company: Mechanics Bancorp
Filing Date: 2025-09-02
Form: POS AM
Chunk 0
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As filed with the Securities and Exchange Commission on September 2, 2025 Registration No. 333- 288528 UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 POST-EFFECTIVE AMENDMENT NO. 1 TO FORM S-4 ON FORM S-8 REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 Mechanics Bancorp (Exact name of registrant as specified in its charter)

| Washington                                                     |     | 91-0186600                          |
| (State or Other Jurisdiction of Incorporation or Organization) |     | -I.R.S. Employer Identification No. |

1111 Civic Drive, Suite 390 Walnut Creek, CA 94596 (Address and Zip Code of Principal Executive Offices) Mechanics Bank 2022 Omnibus Incentive Plan Mechanics Bank 2017 Incentive Unit Plan (Full title of the plans) Glenn Shrader Executive Vice President, General Counsel Mechanics Bancorp 1111 Civic Drive, Suite 390 Walnut Creek, CA 94596 (925) 482-8000 (Name, Address, and Telephone Number, including Area Code, of Agent for Service) Copies to: Jacob A. Kling, Esq. Eric M. Feinstein, Esq. Wachtell, Lipton, Rosen & Katz 51 West 52nd Street New York, New York 10019 (212) 403-1000 Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company or an emerging growth company. See definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company” and “emerging growth company” in Rule 12b-2 of the Exchange Act.

| Large accelerated filer | ☐ | Accelerated filer         | ☒ |
| Non-accelerated filer   | ☐ | Smaller reporting company | ☒ |
|                         |   | Emerging growth company   | ☐ |

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 7(a)(2)(B) of the Securities Act. ☐ EXPLANATORY NOTE Mechanics Bancorp (formerly HomeStreet, Inc.) (“Mechanics” or the “Registrant”), hereby amends its registration statement on Form