Great Southern Bancorp (GSBC) director exercises options and sells 2,000 shares

Rhea-AI Filing Summary

Great Southern Bancorp director Thomas J. Carlson reported several equity moves. On January 28, 2026, he exercised an option for 2,000 shares of common stock at $41.30 per share and sold 2,000 shares at $59.89 per share, leaving 100 common shares held directly.

On January 13, 2026, a dividend reinvestment plan purchase added 122 common shares at $62.5807 per share, held indirectly through his spouse, bringing that indirect holding to 17,886 shares. The filing also lists multiple option grants covering 2,000 shares each with vesting schedules extending through 2030.

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

OMB APPROVAL

OMB Number:			3235-0287
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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^*

CARLSON THOMAS J

(Last) (First) (Middle)

CARE OF GREAT SOUTHERN BANK

218 S. GLENSTONE AVE

(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	01/28/2026		M		2,000	A	$41.3	2,100	D
Common stock	01/28/2026		S		2,000	D	$59.89	100	D
Common stock	01/13/2026		J(1)	V	122	A	$62.5807	17,886	I	Spouse

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	$41.3	01/28/2026		M			2,000	(2)	10/24/2026	Common Stock	2,000	$41.3	0	D
Option to purchase	$52.2							(3)	11/15/2027	Common Stock	2,000		2,000	D
Option to purchase	$55							(4)	11/28/2028	Common stock	2,000		4,000	D
Option to purchase	$60.15							(5)	11/20/2029	Common stock	2,000		6,000	D
Option to purchase	$41.74							(6)	10/26/2030	Common stock	2,000		8,000	D
Option to purchase	$57.98							(7)	11/17/2031	Common stock	2,000		10,000	D
Option to purchase	$61.55							(8)	11/16/2032	Common stock	2,000		12,000	D
Option to purchase	$53.22							(9)	11/15/2033	Common stock	2,000		14,000	D
Option to purchase	$61.79							(10)	11/20/2034	Common stock	2,000		16,000	D
Option to purchase	$57.29							(11)	11/19/2035	Common stock	2,000		18,000	D

Explanation of Responses:

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

2. 500 shares vest on 10/24/2018, 10/24/2019, 10/24/2020 and 10/24/2021

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 Thomas J. Carlson	01/29/2026
	** 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.
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FAQ

What insider activity did GSBC director Thomas J. Carlson report?

Thomas J. Carlson reported exercising options for 2,000 Great Southern Bancorp shares at $41.30 and selling 2,000 shares at $59.89. He also reported a 122-share dividend reinvestment plan purchase held indirectly through his spouse, plus multiple outstanding option grants with future vesting dates.

How many GSBC shares does Thomas J. Carlson now hold directly and indirectly?

After the reported trades, Carlson holds 100 Great Southern Bancorp common shares directly. He also reports 17,886 common shares held indirectly through his spouse via a dividend reinvestment plan, in addition to several option grants covering 2,000 shares each with staggered vesting schedules.

At what prices did the GSBC director exercise and sell shares?

Carlson exercised 2,000 options at $41.30 per share and sold 2,000 Great Southern Bancorp common shares at $59.89 per share on January 28, 2026. Separately, 122 shares were acquired through a dividend reinvestment plan at an average price of $62.5807 per share.

What is the nature of the indirect GSBC share ownership reported?

The filing shows 17,886 Great Southern Bancorp common shares held indirectly through Carlson’s spouse. These include a 122-share dividend reinvestment plan purchase on January 13, 2026, at $62.5807 per share, classified as indirect ownership with the nature of ownership specified as “Spouse.”

What stock options for GSBC does Thomas J. Carlson hold after these transactions?

Following the option exercise, one 2,000‑share option at a $41.30 exercise price shows zero remaining. The filing lists multiple other options, each for 2,000 Great Southern Bancorp shares, with exercise prices from $41.74 to $61.79 and vesting tranches through dates between 2024 and 2030.

What do the vesting footnotes in the GSBC Form 4 indicate?

The footnotes explain that each 2,000‑share option grant typically vests in four equal 500‑share installments. Vesting dates range from October 24, 2018 through November 19, 2030, clarifying when portions of each Great Southern Bancorp option become exercisable under the company’s equity compensation arrangements.