Insider at Great Southern Bancorp (GSBC) exercises options and sells shares

Rhea-AI Filing Summary

Great Southern Bancorp, Inc. insider activity: Treasurer and Senior Vice President of a subsidiary Rex A. Copeland reported same-day option exercise and share sale in Great Southern Bancorp, Inc. common stock. On 02/06/2026, he exercised an option to buy 1,797 shares at $41.30 per share and acquired the same number of common shares.

That day, he sold 1,797 shares of common stock at an average price of $63.6717 per share, leaving him with 24,671 shares owned directly. He also continues to hold multiple option awards on Great Southern Bancorp common stock, including several 4,200-share grants expiring between 2027 and 2029, and later grants through 2032 with exercise prices ranging from $41.74 to $61.55.

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

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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^*

COPELAND REX A

(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)

	Director		10% Owner
X	Officer (give title below)	X	Other (specify below)
	Treasurer		Senior Vice Pres of Subsidiary

3. Date of Earliest Transaction (Month/Day/Year)
02/06/2026

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	02/06/2026		M		1,797	A	$41.3	26,468	D
Common stock	02/06/2026		S		1,797	D	$63.6717	24,671	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	$41.3	02/06/2026		M			1,797	(1)	10/24/2026	Common Stock	1,797	$41.3	0	D
Option to purchase	$52.2							(2)	11/15/2027	Common Stock	4,200		4,200	D
Option to purchase	$55							(3)	11/28/2028	Common stock	4,200		8,400	D
Option to purchase	$60.15							(4)	11/20/2029	Common stock	4,200		12,600	D
Option to purchase	$41.74							(5)	10/26/2030	Common stock	4,500		17,100	D
Option to purchase	$57.98							(6)	11/17/2031	Common stock	4,750		21,850	D
Option to purchase	$61.55							(7)	11/16/2032	Common stock	4,800		26,650	D

Explanation of Responses:

1. 1,050 shares vest on 10/24/2018 and 747 shares vest on 10/24/2019

2. 1,050 shares vest on 11/15/2019, 11/15/2020, 11/15/2021 and 11/15/2022

3. 1,050 shares vest on 11/28/2020, 11/28/2021, 11/28/2022 and 11/28/2023

4. 1,050 shares vest on 11/20/2021, 11/20/2022, 11/20/2023 and 11/20/2024

5. 1,125 shares vest on 10/26/2022, 10/26/2023, 10/26/2024 and 10/26/2025

6. 1,188 shares vest on 11/17/2023 and 11/17/2024 and 1,187 shares vest on 11/17/2025 and 11/17/2026

7. 1,200 shares vdst on 11/16/2024, 11/16/2025, 11/16/2026 and 11/16/2027

Remarks:

	Matt Snyder, by Power of Attorney from Rex A Copeland	02/06/2026
	** 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 transaction did GSBC treasurer Rex A. Copeland report?

Rex A. Copeland reported exercising stock options and selling shares of Great Southern Bancorp, Inc. stock. On 02/06/2026, he acquired 1,797 shares at $41.30 per share, then sold 1,797 shares at an average price of $63.6717 per share the same day.

How many GSBC shares does Rex A. Copeland own after this Form 4?

After the reported transactions, Rex A. Copeland directly owns 24,671 shares of Great Southern Bancorp, Inc. common stock. This reflects his holdings following the 1,797-share option exercise and the same-sized 1,797-share sale on 02/06/2026 disclosed in the Form 4.

At what prices did Rex A. Copeland exercise and sell GSBC shares?

He exercised stock options at an exercise price of $41.30 per share and sold the resulting 1,797 Great Southern Bancorp, Inc. shares at an average price of $63.6717 per share. Both the option exercise and sale occurred on 02/06/2026 according to the filing.

What option grants on GSBC stock does Rex A. Copeland still hold?

He continues to hold several options to purchase Great Southern Bancorp, Inc. common stock. Remaining awards include 4,200-share grants expiring in 2027, 2028, and 2029, plus additional grants of 4,500, 4,750, and 4,800 shares expiring between 2030 and 2032 at exercise prices from $41.74 to $61.55.

What role does Rex A. Copeland have at Great Southern Bancorp, Inc.?

Rex A. Copeland is identified as an officer of Great Southern Bancorp, Inc., serving as Treasurer and Senior Vice President of a subsidiary. He is not listed as a director or 10% owner in the Form 4 reporting his 02/06/2026 equity transactions.

What does transaction code M and S mean in this GSBC Form 4?

In this filing, code “M” indicates the exercise of an option to acquire Great Southern Bancorp, Inc. common stock, while code “S” indicates an open market or private sale of those shares. Copeland used code M for the 1,797-share exercise and code S for the 1,797-share sale.