Form 4: Hart Debra Mallonee reports multiple insider transactions in GSBC

Rhea-AI Filing Summary

Hart Debra Mallonee reported multiple insider transaction types in a Form 4 filing for GSBC. The filing lists transactions totaling 13 shares at a weighted average price of $62.29 per share. Following the reported transactions, holdings were 2,000 shares.

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)
01/13/2026

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	01/13/2026		J(1)	V	13	A	$62.2879	2,000	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	$51.4							(2)	03/15/2027	Common Stock	5,000		5,000	D
Option to purchase	$52.2							(3)	11/15/2027	Common Stock	2,000		7,000	D
Option to purchase	$55							(4)	11/28/2028	Common stock	2,000		9,000	D
Option to purchase	$60.15							(5)	11/20/2029	Common stock	2,000		11,000	D
Option to purchase	$41.74							(6)	10/26/2030	Common stock	2,000		13,000	D
Option to purchase	$57.98							(7)	11/17/2031	Common stock	2,000		15,000	D
Option to purchase	$61.55							(8)	11/16/2032	Common stock	2,000		17,000	D
Option to purchase	$53.22							(9)	11/15/2033	Common stock	2,000		19,000	D
Option to purchase	$61.79							(10)	11/20/2034	Common stock	2,000		21,000	D
Option to purchase	$57.29							(11)	11/19/2035	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

11. 500 shares vest on 11/19/2027, 11/19/2028, 11/19/2029 and 11/19/2030

Remarks:

	Matt Snyder, by Power of Attorney from Debra Mallonee Hart	02/17/2026
	** 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 Debra Mallonee Hart report for GSBC?

Debra Mallonee Hart reported acquiring 13 shares of Great Southern Bancorp common stock on January 13, 2026 through a dividend reinvestment plan (DRIP) at $62.2879 per share, increasing her directly owned stake to 2,000 shares.

How many GSBC common shares does Debra Mallonee Hart own after this Form 4?

After the reported DRIP transaction, Debra Mallonee Hart directly owns 2,000 shares of Great Southern Bancorp common stock. The Form 4 shows the 13-share acquisition at $62.2879 per share and lists this updated ownership total in the non-derivative holdings table.

What stock options for GSBC did Debra Mallonee Hart disclose?

Debra Mallonee Hart disclosed 23,000 options to purchase Great Southern Bancorp common stock. These options carry exercise prices between $41.74 and $61.79 and have expiration dates from March 15, 2027 through November 19, 2035, as detailed in the derivative securities table.

What is the nature of the 13 GSBC shares acquired by Debra Mallonee Hart?

The 13 Great Southern Bancorp shares were acquired via a dividend reinvestment plan (DRIP), described as a DRIP acquisition and noted as exempt from Section 16 reporting, with this transaction being reported voluntarily according to the explanation of responses footnote.

What role does Debra Mallonee Hart hold at Great Southern Bancorp (GSBC)?

Debra Mallonee Hart is identified as a director of Great Southern Bancorp, Inc. The Form 4 checks the Director box in the relationship section and does not mark her as an officer or 10% owner of the company.

How do Debra Mallonee Hart’s GSBC options vest over time?

Her options vest in annual installments by grant, typically 500 or 1,250 shares per year on specified dates. Footnotes describe vesting schedules running from 2019 through 2030, with each option grant vesting over four consecutive years on the same calendar date.