# EDGAR Filing Document

**Accession Number:** 0001530249
**File Stem:** 0000939057-26-000122
**Filing Date:** 2026-6
**Character Count:** 8226
**Document Hash:** fbc87be413bcc2750bdca51d0bf778b3
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0000939057-26-000122.hdr.sgml**: 20260601

**ACCESSION NUMBER**: 0000939057-26-000122

**CONFORMED SUBMISSION TYPE**: 8-K

**PUBLIC DOCUMENT COUNT**: 13

**CONFORMED PERIOD OF REPORT**: 20260601

**ITEM INFORMATION**: Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers: Compensatory Arrangements of Certain Officers

**ITEM INFORMATION**: Financial Statements and Exhibits

**FILED AS OF DATE**: 20260601

**DATE AS OF CHANGE**: 20260601

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** FS Bancorp, Inc.
- **CENTRAL INDEX KEY:** 0001530249
- **STANDARD INDUSTRIAL CLASSIFICATION:** SAVINGS INSTITUTIONS, NOT FEDERALLY CHARTERED [6036]
- **ORGANIZATION NAME:** 02 Finance
- **EIN:** 454585178
- **STATE OF INCORPORATION:** WA
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** 8-K
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-35589
- **FILM NUMBER:** 261048217

**BUSINESS ADDRESS:**
- **STREET 1:** 6920 220TH STREET SW
- **CITY:** MOUNTLAKE TERRACE
- **STATE:** WA
- **ZIP:** 98043
- **BUSINESS PHONE:** 425-771-5299

**MAIL ADDRESS:**
- **STREET 1:** 6920 220TH STREET SW
- **CITY:** MOUNTLAKE TERRACE
- **STATE:** WA
- **ZIP:** 98043

?xml version='1.0' encoding='ASCII'?

#### 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
Date of Report (Date of earliest event reported): **June 1, 2026**

### FS BANCORP, INC.
(Exact name of registrant as specified in its charter)

---

| | | |
|:---|:---|:---|
| **Washington**<br>| **001-35589**<br>| **45-4585178**<br>|
| (State or other jurisdiction<br> of incorporation) | (Commission<br> File Number) | (I.R.S. Employer<br> Identification No.) |

---

---

| | |
|:---|:---|
| **6920 220th Street SW**<br>**Mountlake Terrace, Washington** | <br> **98043**<br>|
| (Address of principal executive offices) | (Zip Code) |

---

Registrant's telephone number, including area code: **(425) 771-5299**

---

| |
|:---|
| 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. |
|  ☐&nbsp;&nbsp;&nbsp;&nbsp; Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425) |
|  ☐&nbsp;&nbsp;&nbsp;&nbsp; Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12) |
|  ☐&nbsp;&nbsp;&nbsp;&nbsp; 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, par value $.01 per share<br>| FSBW<br>| The NASDAQ Stock Market LLC<br>|

---

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

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 13(a) of the Exchange Act. □

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#### Item 5.02 Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers.
On June 1, 2026, FS Bancorp, Inc. ("Company") (NASDAQ: FSBW), the holding company for 1st Security Bank of Washington ("1st Security Bank" or "Bank") announced that it has named Matthew D. Mullet as Chief Executive Officer of the Company effective June 1, 2026. This appointment is part of the CEO succession plan that was previously announced on August 15, 2025. Matt Mullet has served as President and CEO of 1st Security Bank and as President of the Company and will also continue in those roles.

Joe Adams, who retired as CEO of the Company on May 31, 2026, will continue to serve as a director of the Company and the Bank.

For further information reference is made to the press release dated June 1, 2026, which is attached hereto as Exhibit 99.1 and incorporated herein by reference.

#### Item 9.01 Financial Statements and Exhibits.
(d) Exhibits

---

| | |
|:---|:---|
| **Exhibit No.** | **Description** |
| 99.1 | [Press Release of FS Bancorp, Inc. dated June 1, 2026.](ex9916126.htm) |
| 104 | Cover Page Interactive Data File (embedded within the Inline XBRL document) |

---

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#### SIGNATURES
Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

---

| | |
|:---|:---|
| Date: June 1, 2026 | **FS BANCORP, INC.** |
|  | /s/Erin Burr  |
|  | Erin Burr<br>|
|  | Chief Risk Officer and CRA Officer, EVP |

---

------

## Exhibit 99.1

**Exhibit 99.1**<br>

**** 

![](image00001.jpg)

### FS Bancorp, Inc. Names Matt Mullet CEO

**Mountlake Terrace, WA, June 1, 2026 –** FS Bancorp, Inc. (the "Company") (NASDAQ: FSBW), the holding company for 1st Security Bank of Washington ("1st Security Bank" or "Bank") announced today that it has named Matthew D. Mullet CEO of the Company, effective June 1, 2026. This appointment is part of the CEO succession plan that was previously announced on August 15, 2025. Matt Mullet has served as President and CEO of 1st Security Bank and as President of the Company and will continue in those roles.

Joe Adams, who retired as CEO of the Company on May 31, 2026, will continue to serve as a director of the Company and the Bank. Under his leadership, there was an emphasis on reinforcing the Bank's people first culture and developing the Company's vision and purpose statements.

Matt Mullet served the bank as its Chief Financial Officer since 2011 before his current role. His experience and dedication to the Company's customers and employees will continue in his new role.

Mr. Mullet said, "I am honored by this opportunity to support our teams across the organization, continue with our financial success, and contribute to the Company's Vision to Build a Truly Great Place to Work and Bank."

#### About 1st Security Bank of Washington

FS Bancorp, Inc., a Washington corporation, is the holding company for 1st Security Bank of Washington. The Bank offers a range of loan and deposit services primarily to small- and middle-market businesses and individuals in Washington and Oregon. It operates through 28 bank branches, one headquarters office that provides loans and deposit services, and loan production offices in various suburban communities in the greater Puget Sound area, the Kennewick-Pasco-Richland metropolitan area of Washington, also known as the Tri-Cities, and in Vancouver, Washington. Additionally, the Bank services home mortgage customers across the Northwest, focusing on markets in Washington State including the Puget Sound, Tri-Cities, and Vancouver.

#### Note Regarding Forward Looking Statements

This press release includes forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995, which can be identified by words such as "may," "expected," "anticipate", "continue," or other comparable words. In addition, all statements other than statements of historical facts that address activities that 1st Security expects or anticipates will or may occur in the future are forward-looking statements. Readers are encouraged to read the Securities and Exchange Commission reports of FS Bancorp, particularly its Annual Report on Form 10-K for the fiscal year ended December 31, 2025, for meaningful cautionary language discussing why actual results may vary materially from those anticipated by management.

#### Contacts:

Matthew D. Mullet

President & CEO

(425) 771-5299

www.FSBWA.com