Form S-8 FS Bancorp, Inc.

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 the 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   [X]
	Non-accelerated filer    [  ]	Smaller reporting company  [  ]
		Emerging growth company  [  ]

PART I

INFORMATION REQUIRED IN THE SECTION 10(a) PROSPECTUS

The document(s) containing the information specified in Part I of Form S-8 will be sent or given to participants in the FS Bancorp 2026 Equity Incentive Plan, as specified by Rule 428(b)(1) promulgated by the Securities and Exchange Commission (the “Commission”) under the Securities Act of 1933. This document is not being filed with the Commission, but constitutes (along with the documents incorporated by reference into this Registration Statement pursuant to Item 3 of Part II hereof) a prospectus that meets the requirements of Section 10(a) of the Securities Act of 1933. The registrant shall maintain a file of such documents in accordance with the provisions of Rule 428(a)(2) of the Securities Act of 1933. Upon request, the registrant shall furnish to the Commission or its staff a copy or copies of all of the documents included in such file.

PART II

INFORMATION REQUIRED IN THE REGISTRATION STATEMENT

Item 3.    Incorporation of Documents by Reference

Except to the extent that information is deemed furnished and not filed pursuant to securities laws and regulations, the following documents previously or concurrently filed by FS Bancorp, Inc. (the “Registrant”) with the Commission are hereby incorporated by reference in this Registration Statement and the prospectus to which this Registration Statement relates (the “Prospectus”):

All documents filed by the Registrant with the Commission pursuant to Sections 13(a), 13(c), 14, or 15(d) of the Securities Exchange Act of 1934, as amended (“Exchange Act”) (excluding any portions of such documents that have been “furnished” and not “filed” for purposes of the Exchange Act) after the filing of this Registration Statement, and prior to the filing of a post-effective amendment which indicates that all securities offered hereby have been sold or which deregisters all securities then remaining unsold, shall be deemed incorporated by reference into this Registration Statement and the Prospectus and to be a part hereof and thereof from the date of the filing of such documents. Any statement contained in the documents incorporated, or deemed to be incorporated, by reference herein or therein shall be deemed to be modified or superseded for purposes of this Registration Statement and the Prospectus to the extent that a statement contained herein or therein or in any other subsequently filed document which also is, or is deemed to be, incorporated by reference herein or therein modifies or supersedes such statement. Any such statement so modified or superseded shall not be deemed, except as so modified or superseded, to constitute a part of this Registration Statement and the Prospectus.

All information appearing in this Registration Statement is qualified in its entirety by the detailed information, including financial statements, appearing in the documents incorporated herein by reference.

Item 4.    Description of Securities

Not Applicable

Item 5.    Interests of Named Experts and Counsel

Not Applicable

Item 6.    Indemnification of Directors and Officers

Article XIV of the Registrant’s Articles of Incorporation requires indemnification of directors and officers to the fullest extent permitted by the Washington Business Corporation Act (“WBCA”). However, the indemnity does not apply to (1) acts or omissions in connection with a proceeding by or in the right of the Registrant in which the director or officer is finally adjudged liable to the Registrant, (2) conduct finally adjudged to violate the WBCA prohibition against unlawful distributions by the corporation or (3) any transaction with respect to which it was finally adjudged that the director or officer personally received a benefit to which he/she was not legally entitled.

The WBCA provides for indemnification of directors, officers, employees and agents in certain circumstances. WBCA Section 23B.08.510 provides that a corporation may indemnify an individual made a party to a proceeding because the individual is or was a director against liability incurred in the proceeding if (a) the director acted in good faith, (b) the director reasonably believed that the director’s conduct was in the best interests of the corporation, or in certain instances, at least not opposed to its best interests and (c) in the case of any criminal proceeding, the director had no reasonable cause to believe the director’s conduct was unlawful. However, a corporation may not indemnify a director under section (a) in connection with a proceeding by or in the right of the corporation in which the director was adjudged liable to the corporation or (b) in connection with any other proceeding charging improper personal benefit to the director in which the director was adjudged liable on the basis that personal benefit was improperly received by the director. WBCA Section 23B.08.520 provides that unless limited by the articles of incorporation, a corporation must indemnify a director who was wholly successful in the defense of any proceeding to which the director was a party because of being a director of the corporation against reasonable expenses incurred by the director in connection with the proceeding. WBCA Section 23B.08.540 provides a mechanism for court-ordered indemnification.

WBCA Section 23B.08.570 provides that unless a corporation’s articles of incorporation provide otherwise, (1) an officer of the corporation who is not a director is entitled to mandatory indemnification under WBCA Section 23B.08.520, and is entitled to apply for court-ordered indemnification under WBCA Section 23B.08.540, (2) the corporation may indemnify and advance expenses under WBCA Section 23B.08.510 through 23B.08.560 to an officer, employee or agent of the corporation who is not a director to the same extent as to a director and (3) a corporation may also indemnify and advance expenses to an officer, employee or agent who is not a director to the extent, consistent with law, that may be provided by its articles of incorporation, bylaws, general or specific action of its board of directors or contract. WBCA Section 23B.08.580 provides that a corporation may purchase insurance on behalf of an individual who is or was a director, officer, employee or agent of the corporation against liability asserted against or incurred by the individual in that capacity, whether or not the corporation would have power to indemnify the individual against the same liability under WBCA Section 23B.08.510 or 23B.08.520.

The Registrant maintains liability insurance for the benefit of its officers and directors.

The above discussion of the Registrant’s Articles of Incorporation and the WBCA is not intended to be exhaustive and is qualified in its entirety by such Articles of Incorporation and statutes.

Item 7.    Exemption From Registration Claimed

Not Applicable

Item 8.    Exhibits

The following exhibits are filed with or incorporated by reference into this Registration Statement on Form S-8:

Item 9.    Undertakings

1. To file, during any period in which offers or sales are being made, a post-effective amendment to this Registration Statement: (i) to include any prospectus required by Section 10(a)(3) of the Securities Act of 1933; (ii) to reflect in the prospectus any facts or events arising after the effective date of the Registration Statement (or the most recent post-effective amendment thereof) which, individually or in the aggregate, represent a fundamental change in the information set forth in the Registration Statement. Notwithstanding the foregoing, any increase or decrease in volume of securities offered (if the total dollar value of securities offered would not exceed that which was registered) and any deviation from the low or high end of the estimated maximum offering range may be reflected in the form of prospectus filed with the Commission pursuant to Rule 424(b) if, in the aggregate, the changes in volume and price represent no more than 20% change in the maximum aggregate offering price set forth in the “Calculation of Filing Fee Tables” or “Calculation of Registration Fee” table, as applicable, in the effective Registration Statement; and (iii) to include any material information with respect to the plan of distribution not previously disclosed in the Registration Statement or any material change in such information in the Registration Statement; provided, however, that clauses (i) and (ii) do not apply if the information required to be included in a post-effective amendment by those clauses is contained in reports filed with or furnished to the Commission by the Registrant pursuant to Section 13 or Section 15(d) of the Securities Exchange Act of 1934 that are incorporated by reference in the Registration Statement.

2. That, for the purposes of determining any liability under the Securities Act of 1933, each such post-effective amendment shall be deemed to be a new registration statement relating to the securities offered therein, and the offering of such securities at that time shall be deemed the initial bona fide offering thereof.

3. To remove from registration by means of a post-effective amendment any of the securities being registered which remain unsold at the termination of the offering.

(b) The undersigned Registrant hereby undertakes that, for the purposes of determining any liability under the Securities Act of 1933, each filing of the Registrant’s annual report pursuant to Section 13(a) or Section 15(d) of the Securities Exchange Act of 1934 (and, where applicable, each filing of an employee benefit plan’s annual report pursuant to Section 15(d) of the Securities Exchange Act of 1934) that is incorporated by reference in the Registration Statement shall be deemed to be a new registration statement relating to the securities offered therein, and the offering of such securities at that time shall be deemed to be the initial bona fide offering thereof.

(c) Insofar as indemnification for liabilities arising under the Securities Act of 1933 may be permitted to directors, officers and controlling persons of the Registrant pursuant to the foregoing provisions, or otherwise, the Registrant has been advised that in the opinion of the Securities and Exchange Commission such indemnification is against public policy as expressed in the Securities Act of 1933 and is, therefore, unenforceable. In the event that a claim for indemnification against such liabilities (other than the payment by the Registrant of expenses incurred or paid by a director, officer or controlling person of the Registrant in the successful defense of any action, suit or proceeding) is asserted by such director, officer or controlling person in connection with the securities being registered, the Registrant will, unless in the opinion of its counsel the matter has been settled by controlling precedent, submit to a court of appropriate jurisdiction the question whether such indemnification by it is against public policy as expressed in the Securities Act of 1933 and will be governed by the final adjudication of such issue.

SIGNATURES

Pursuant to the requirements of the Securities Act of 1933, the Registrant certifies that it has reasonable grounds to believe that it meets all of the requirements for filing on Form S-8 and has duly caused this Registration Statement to be signed on its behalf by the undersigned, thereunto duly authorized, in the City of Mountlake Terrace, State of Washington, on June 12, 2026.

	FS BANCORP, INC.
	By:  /s/ Matthew D. Mullet
	Matthew D. Mullet         Chief Executive Officer         (Duly Authorized Representative)

POWER OF ATTORNEY

Pursuant to the requirements of the Securities Act of 1933, this Registration Statement has been signed by the following persons in the capacities and on the dates indicated. Each person whose signature appears below hereby makes, constitutes and appoints Matthew D. Mullet or Phillip D. Whittington as his or her true and lawful attorney, with full power to sign for such person and in such person’s name and capacity indicated below, and with full power of substitution any and all amendments to this Registration Statement, hereby ratifying and confirming such person’s signature as it may be signed by said attorney to any and all amendments.

FS BANCORP, INC.

EXHIBIT INDEX

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