SEC Form S-8 filed by Great Southern Bancorp Inc.

As filed with the Securities and Exchange Commission on June 12, 2026

Registration No. 333-__________

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM S-8

REGISTRATION STATEMENT

UNDER

THE SECURITIES ACT OF 1933

GREAT SOUTHERN BANCORP, INC.

(Exact name of registrant as specified in its charter)

Great Southern Bancorp, Inc. 2026 Omnibus Incentive Plan

(Full title of the plan)

Martin L. Meyrowitz, P.C.

Craig M. Scheer, P.C.

Silver, Freedman, Taff & Tiernan LLP

(a limited liability partnership including professional corporations)

3299 K Street, N.W., Suite 100

Washington, D.C. 20007

(Name and address of agent for service)

(202) 295-4500

(Telephone number, including area code, of agent for service)

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.

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. ¨

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 Great Southern Bancorp, Inc. 2026 Omnibus Incentive Plan, as required by Rule 428(b)(1) promulgated by the Securities and Exchange Commission (the “Commission”) under the Securities Act of 1933, as amended (the “Securities Act”).

Such document(s) are not being filed with the Commission but constitute (along with the documents incorporated by reference into the Registration Statement pursuant to Item 3 of Part II hereof) a prospectus that meets the requirements of Section 10(a) of the Securities Act.

PART II

INFORMATION REQUIRED IN THE REGISTRATION STATEMENT

The following documents previously or concurrently filed by Great Southern Bancorp, Inc. (the “Company”) with the Commission under the Securities Exchange Act of 1934, as amended (the “Exchange Act”), are hereby incorporated by reference into this Registration Statement and the prospectus to which this Registration Statement relates (the “Prospectus”):

All documents filed by the Company with the Commission pursuant to Sections 13(a), 13(c), 14 and 15(d) of the Exchange Act (excluding any document or portion thereof that has been furnished to and deemed not to be filed with the Commission), 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.

The Company shall furnish without charge to each person to whom the Prospectus is delivered, on the written or oral request of such person, a copy of any or all of the documents incorporated by reference, other than exhibits to such documents (unless such exhibits are specifically incorporated by reference to the information that is incorporated). Requests should be directed to: Investor Relations, Great Southern Bancorp, Inc., 1451 E. Battlefield, Springfield, Missouri 65804-9009, telephone number (417) 887-4400.

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

Not applicable.

Not applicable.

Section 2-405.2 of the Maryland General Corporation Law permits a Maryland corporation to include in its charter a provision limiting the liability of its directors and officers to the corporation or its stockholders for money damages except: (1) to the extent it is proven that the director or officer actually received an improper benefit or profit in money, property or services for the amount of the benefit or profit in money, property or services actually received; or (2) to the extent that a judgment or other final adjudication adverse to the director or officer is entered in a proceeding based on a finding that the director’s or officer’s action or failure to act was the result of active and deliberate dishonesty and was material to the cause of action adjudicated in the proceeding. The Company’s charter contains such a provision, thereby limiting the liability of its directors and officers to the maximum extent permitted by Maryland law.

Section 2-418 of the Maryland General Corporation Law permits a Maryland corporation to indemnify a director or officer who is made a party to any proceeding by reason of service in that capacity against judgments, penalties, fines, settlements and reasonable expenses actually incurred unless it is established that: (1) the act or omission of the director or officer was material to the matter giving rise to the proceeding and was committed in bad faith or was the result of active and deliberate dishonesty; (2) the director or officer actually received an improper personal benefit in money, property or services; or (3) in the case of a criminal proceeding, the director or officer had reasonable cause to believe that his or her conduct was unlawful. The Maryland General Corporation Law provides that where a director or officer is a defendant in a proceeding by or in the right of the corporation, the director or officer may not be indemnified if he or she is found liable to the corporation. The Maryland General Corporation Law also provides that a director or officer may not be indemnified in respect of any proceeding alleging improper personal benefit in which he or she was found liable on the grounds that personal benefit was improperly received. A director or officer found liable in a proceeding by or in the right of the corporation or in a proceeding alleging improper personal benefit may petition a court to nevertheless order indemnification of expenses if the court determines that the director or officer is fairly and reasonably entitled to indemnification in view of all the relevant circumstances.

Section 2-418 of the Maryland General Corporation Law provides that unless limited by the charter of a Maryland corporation, a director or an officer who is successful on the merits or otherwise in defense of any proceeding must be indemnified against reasonable expenses. Section 2-418 also provides that a Maryland corporation may advance reasonable expenses to a director or an officer upon the corporation’s receipt of (a) a written affirmation by the director or officer of his or her good faith belief that he or she has met the standard of conduct necessary for indemnification by the corporation and (b) a written undertaking by the director or officer or on his or her behalf to repay the amount paid or reimbursed by the corporation if it is ultimately determined that the standard of conduct was not met.

The Company’s charter provides for indemnification of directors and officers to the maximum extent permitted by the Maryland General Corporation Law.

Under a directors’ and officers’ liability insurance policy, directors and officers of the Company are insured against certain liabilities.

Not applicable.

See Exhibit Index.

(a)           The undersigned registrant hereby undertakes:

(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 a 20% change in the maximum aggregate offering price set forth in the “Calculation of Registration Fee” table 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 to such information in the registration statement;

provided, however, that paragraphs (a)(1)(i) and (a)(1)(ii) do not apply if the information required to be included in a post-effective amendment by those paragraphs 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.

INDEX TO EXHIBITS

SIGNATURES

The Registrant. 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 Springfield, State of Missouri, on June 12, 2026.

POWER OF ATTORNEY

We, the undersigned officers and directors of Great Southern Bancorp, Inc., hereby severally and individually constitute and appoint Joseph W. Turner and Rex A. Copeland, and each of them, the true and lawful attorneys and agents of each of us to execute in the name, place and stead of each of us (individually and in any capacity stated below) any and all amendments (including post-effective amendments) to this registration statement and all instruments necessary or advisable in connection therewith and to file the same with the Securities and Exchange Commission, each of said attorneys and agents to have the power to act with or without the others and to have full power and authority to do and perform in the name and on behalf of each of the undersigned every act whatsoever necessary or advisable to be done in the premises as fully and to all intents and purposes as any of the undersigned might or could do in person, and we hereby ratify and confirm our signatures as they may be signed by our said attorneys and agents or each of them to any and all such amendments and instruments.

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.