[Form 4] GREAT SOUTHERN BANCORP, INC. Insider Trading Activity

Rhea-AI Filing Summary

Great Southern Bancorp, Inc. (GSBC)10/14/2025, the reporting person acquired 15 shares of common stock at a price of $59.9887 per share through a transaction noted as code J, described as a DRIP acquisition that is exempt from Section 16 reporting and is being reported voluntarily. After this, the director beneficially owned 1,987 shares of common stock directly.

The filing also details multiple option grants to purchase GSBC common stock. One set of options has an exercise price of $57.29 per share, with 500-share tranches first exercisable on 11/19/2027, 11/19/2028, 11/19/2029 and 11/19/2030, all expiring on 11/19/2035. Additional outstanding options cover various grants with exercise prices between $41.74 and $61.79, in blocks of 2,000 shares each, with vesting dates from 03/15/2019 through 11/20/2029 and an aggregate of 23,000 optioned shares reported as beneficially owned.

11/20/2025 - 04:50 PM

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

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Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Hart Debra Mallonee

(Last) (First) (Middle)

CARE OF GREAT SOUTHERN BANK

218 SOUTH GLENSTONE AVENUE

(Street)

SPRINGFIELD MO 65802

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
GREAT SOUTHERN BANCORP, INC. [ GSBC ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director		10% Owner
	Officer (give title below)		Other (specify below)

3. Date of Earliest Transaction (Month/Day/Year)
10/14/2025

4. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock	10/14/2025		J(1)	V	15	A	$59.9887	1,987	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Option to purchase	$57.29	11/19/2025		A		500		11/19/2027	11/19/2035	Common stock	500	$57.29	500	D
Option to purchase	$57.29	11/19/2025		A		500		11/19/2028	11/19/2035	Common stock	500	$57.29	1,000	D
Option to purchase	$57.29	11/19/2025		A		500		11/19/2029	11/19/2035	Common stock	500	$57.29	1,500	D
Option to purchase	$57.29	11/19/2025		A		500		11/19/2030	11/19/2035	Common stock	500	$57.29	2,000	D
Option to purchase	$51.4							(2)	03/15/2027	Common Stock	5,000		7,000	D
Option to purchase	$52.2							(3)	11/15/2027	Common Stock	2,000		9,000	D
Option to purchase	$55							(4)	11/28/2028	Common stock	2,000		11,000	D
Option to purchase	$60.15							(5)	11/20/2029	Common stock	2,000		13,000	D
Option to purchase	$41.74							(6)	10/26/2030	Common stock	2,000		15,000	D
Option to purchase	$57.98							(7)	11/17/2031	Common stock	2,000		17,000	D
Option to purchase	$61.55							(8)	11/16/2032	Common stock	2,000		19,000	D
Option to purchase	$53.22							(9)	11/15/2033	Common stock	2,000		21,000	D
Option to purchase	$61.79							(10)	11/20/2034	Common stock	2,000		23,000	D

Explanation of Responses:

1. DRIP acquisition exempt from Section 16 reporting being reported voluntarily

2. 1,250 shares vest on 03/15/2019, 03/15/2020, 03/15/2021 and 03/15/2022

3. 500 shares vest on 11/15/2019, 11/15/2020, 11/15/2021 and 11/15/2022

4. 500 shares vest on 11/28/2020, 11/28/2021, 11/28/2022 and 11/28/2023

5. 500 shares vest on 11/20/2021, 11/20/2022, 11/20/2023 and 11/20/2024

6. 500 shares vest on 10/26/2022, 10/26/2023, 10/26/2024 and 10/26/2025

7. 500 shares vest on 11/17/2023, 11/17/2024, 11/17/2025 and 11/17/2026

8. 500 shares vest on 11/16/2024, 11/16/2025, 11/16/2026 and 11/16/2027

9. 500 shares vest on 11/15/2025, 11/15/2026, 11/15/2027 and 11/15/2028

10. 500 shares vest on 11/20/2026, 11/20/2027, 11/20/2028 and 11/20/2029

Remarks:

	Matt Snyder, by Power of Attorney from Debra Mallonee Hart	11/20/2025
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.

FAQ

What insider transaction did GSBC report in this Form 4?

The Form 4 reports that a director of Great Southern Bancorp, Inc. (GSBC) acquired 15 shares of common stock on 10/14/2025 at a price of $59.9887 per share, increasing direct beneficial ownership to 1,987 shares.

How was the 15-share GSBC stock acquisition characterized?

The 15-share acquisition was coded as transaction code J and described as a DRIP acquisition exempt from Section 16 reporting that is being reported voluntarily.

What stock options did the GSBC director receive with a $57.29 exercise price?

The director holds options to purchase GSBC common stock at $57.29 per share, including 500-share tranches first exercisable on 11/19/2027, 11/19/2028, 11/19/2029 and 11/19/2030, all expiring on 11/19/2035.

What is the total number of GSBC option shares reported as beneficially owned?

The Form 4 shows a total of 23,000 shares of GSBC common stock underlying options that are beneficially owned directly by the reporting person.

What other GSBC option grants are disclosed besides the $57.29 options?

The filing lists additional options to purchase GSBC common stock with exercise prices of $51.4, $52.2, $55, $60.15, $41.74, $57.98, $61.55, $53.22 and $61.79, each tied to 2,000 underlying shares and specific future vesting and expiration dates.

How do the GSBC options vest according to the Form 4 explanations?

The explanations state that certain grants vest in installments of 1,250 shares or 500 shares on specific dates, including 03/15/2019–03/15/2022, 11/15/2019–11/15/2022, 11/28/2020–11/28/2023, 11/20/2021–11/20/2024, 10/26/2022–10/26/2025, 11/17/2023–11/17/2026, 11/16/2024–11/16/2027, 11/15/2025–11/15/2028 and 11/20/2026–11/20/2029.

What is the reporting person’s relationship to Great Southern Bancorp (GSBC)?

The reporting person is identified as a Director of Great Southern Bancorp, Inc. and files the Form 4 as one reporting person.