Company: MCHB
Filing Date: 2025-08-07
Form Type: 425
Source: 0001518715-25-000116
Chunk: 0

Company: Mechanics Bancorp
Filing Date: 2025-08-07
Form: 425
Chunk 0
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### UNITED STATES

### SECURITIES AND EXCHANGE COMMISSION

#### Washington, D.C. 20549

#### FORM 8-K

### CURRENT REPORT

#### Pursuant to Section 13 or 15(d) of

#### The Securities Exchange Act of 1934
<div align='center'>Date of Report (Date of Earliest Event Reported): August 7, 2025</div>

#### HOMESTREET, INC.
<div align='center'>(Exact name of registrant as specified in its charter)</div>

| Washington                   |     | 001-35424   |     | 91-0186600         |
| (State or other jurisdiction 
 of incorporation)            |     | -Commission 
 File Number |     | -IRS Employer      
 Identification No. |

#### 601 Union Street, Ste. 2000, Seattle, WA 98101
<div align='center'>(Address of principal executive offices) (Zip Code)

(206) 623-3050

(Registrant’s telephone number, including area code)</div>

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

| ☒ |     | Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425) |

| ☐ |     | Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12) |

| ☐ |     | Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)) |

| ☐ |     | Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c)) |

| Securities registered pursuant to Section 12(b) of the Act: |

| Title of each class        |     | Trading Symbol(s) |     | Name of each exchange on which registered |
| Common Stock, No Par Value |     | HMST              |     | Nasdaq Global Select Market               |

| Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Act or Rule 12b-2 of the Exchange Act. |

| ☐ |     | Emerging growth Company                                                                                                                                                                                                                                    |
| ☐ |     | If an emerging growth company, indicate