Company: SFBC
Filing Date: 2025-04-16
Form Type: DEF 14A
Source: 0001541119-25-000013
Chunk: 0

Company: Sound Financial Bancorp, Inc.
Filing Date: 2025-04-16
Form: DEF 14A
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<div align='center'>UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549</div>

#### SCHEDULE 14A INFORMATION
<div align='center'>Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934

(Amendment No._)</div>

Filed by the Registrant ☒

Filed by a party other than the Registrant ☐

Check the appropriate box:

☐ Preliminary Proxy Statement

☐ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2))

☒ Definitive Proxy Statement

☐ Definitive Additional Materials

☐ Soliciting Material under §240.14a-12

#### SOUND FINANCIAL BANCORP, INC.
<div align='center'>(Name of Registrant as Specified In Its Charter)

(Name of Person(s) Filing Proxy Statement, if other than the Registrant)</div>

Payment of Filing Fee (Check all boxes that apply):

| ☒ |     | No fee required                                                                                     |
| ☐ |     | Fee paid previously with preliminary materials                                                      |
| ☐ |     | Fee computed on table in exhibit required by Item 25(b) per Exchange Act Rules 14a-6(i)(1) and 0-11 |

<div align='center'>2400 3 rd Avenue, Suite 150

Seattle, Washington 98121

(206) 448-0884

April 16, 2025</div>

Dear Fellow Shareholder:

On behalf of the Board of Directors and management of Sound Financial Bancorp, Inc., I cordially invite you to attend our 2025 Annual Meeting of Shareholders. The annual meeting will be held at 10:00 a.m., Pacific Time, on May 27, 2025, at our executive offices, located at 2400 3rd Avenue, Suite 150, Seattle, Washington.

The matters expected to be acted upon at the annual meeting are described in detail in the attached Notice of Annual Meeting of Shareholders and proxy statement. An important part of the annual meeting is the shareholder vote on corporate business items. I urge you to exercise your rights as a shareholder to vote and participate in this process. At the annual meeting, I will present management’s report to you on Sound Financial Bancorp, Inc.’s 2024 financial and operating performance.

We encourage you to carefully review this year’s