GSBC executive exercises options and sells shares

GREAT SOUTHERN BANCORP, INC. vice president of a subsidiary Mark A. Maples reported option exercises and a related stock sale.

Rhea-AI Filing Summary

GREAT SOUTHERN BANCORP, INC. vice president of a subsidiary Mark A. Maples reported option exercises and a related stock sale. On May 1, 2026, he exercised options to acquire a total of 2,387 shares of common stock at exercise prices of $61.55 and $57.98 per share, then completed an open-market sale of 2,387 shares at $68.955 per share. Following these transactions, his directly held common stock balance was 0 shares, while he continued to hold stock options covering 13,200 underlying shares of common stock at exercise prices between $53.22 and $61.79, with expirations from 2033 to 2035. Footnotes show these remaining options vest in annual installments between 2025 and 2030.

Insider Trade Summary

Exercise and Sale: 2,387 shares ($22K approx. pre-tax spread)

Exercise and Sale 8 txns

Insider Maples Mark A

Role Insider

Sold 2,387 shs ($165K)

Approx. gross sale proceeds $165K

Approx. exercise cost $143K

Approx. pre-tax spread $22K

Type	Security	Shares	Price	Value
Exercise	Option to purchase	1,187	$57.98	$69K
Exercise	Option to purchase	1,200	$61.55	$74K
Exercise	Common Stock	1,187	$57.98	$69K
Exercise	Common Stock	1,200	$61.55	$74K
Sale	Common Stock	2,387	$68.955	$165K
holding	Option to purchase	--	--	--
holding	Option to purchase	--	--	--
holding	Option to purchase	--	--	--

Holdings After Transaction: Option to purchase — 17,974 contracts for 13,200 underlying shares (Direct); Common Stock — 0 shares (Direct)

Footnotes (5)

1. F1. 1,187 shares vest on 11/17/2025 and 11/17/2026
2. F2. 1,200 shares vest on 11/16/2025, 11/16/2026 and 11/16/2027
3. F3. 1,200 shares vest on 11/15/2026, 11/15/2027 and 11/15/2028
4. F4. 1,200 shares vest on 11/20/2026, 11/20/2027, 11/20/2028 and 11/20/2029
5. F5. 1,200 shares vest on 11/19/2027, 11/19/2028, 11/19/2029 and 11/19/2030

Key Figures

Shares sold: 2,387 shares Sale price: $68.955/share Options exercised (block 1): 1,200 shares at $61.55 +5 more

8 metrics

Shares sold 2,387 shares Open-market sale of common stock on May 1, 2026

Sale price $68.955/share Price for 2,387 common shares sold

Options exercised (block 1) 1,200 shares at $61.55 Derivative exercise of options into common stock

Options exercised (block 2) 1,187 shares at $57.98 Derivative exercise of options into common stock

Post-transaction common stock 0 shares Directly held GSBC common stock after sale

Remaining options (57.29) 4,800 underlying shares Option to purchase at $57.29, expiring Nov 19, 2035

Remaining options (61.79) 4,800 underlying shares Option to purchase at $61.79, expiring Nov 20, 2034

Remaining options (53.22) 3,600 underlying shares Option to purchase at $53.22, expiring Nov 15, 2033

Key Terms

open-market sale, derivative exercise/conversion, Option to purchase, Common stock, +1 more

5 terms

open-market sale financial

"transaction_action: open-market sale"

An open-market sale is when a shareholder sells existing shares directly on a public exchange to any willing buyer, rather than through a private deal. Think of it like putting goods on a busy market stall where price is set by supply and demand; for investors it matters because such sales increase available supply, can put short-term downward pressure on the stock price, and signal changes in liquidity or investor confidence.

derivative exercise/conversion financial

"transaction_action: derivative exercise/conversion"

Option to purchase financial

"security_title: Option to purchase"

Common stock financial

"underlying_security_title: Common stock"

Common stock represents ownership shares in a company, giving investors a stake in its success and a say in important decisions through voting rights. It is the most common type of stock traded on markets and can provide income through dividends, as well as potential for value growth. For investors, holding common stock means sharing in the company’s profits and risks.

vesting financial

"1,200 shares vest on 11/16/2025, 11/16/2026 and 11/16/2027"

Vesting is the process by which you earn full ownership of something, like company stock or a retirement benefit, over time. It’s like earning the right to keep a gift piece by piece the longer you stay with a company, making sure employees stay committed before they receive all the benefits.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What insider transactions did Mark A. Maples report for GREAT SOUTHERN BANCORP (GSBC)?

Mark A. Maples reported exercising options for 2,387 GSBC common shares and selling 2,387 shares in an open-market transaction. These actions converted option-based compensation into cash while eliminating his directly held common stock position reported in this filing.

How many GREAT SOUTHERN BANCORP (GSBC) shares did Mark A. Maples sell and at what price?

He sold 2,387 GSBC common shares in an open-market transaction at $68.955 per share. This sale matched the number of shares acquired through option exercises reported the same day, effectively liquidating his direct common stock holdings in this filing.

What option exercises did Mark A. Maples complete in this GSBC Form 4 filing?

He exercised options to acquire 1,200 GSBC shares at $61.55 per share and 1,187 shares at $57.98 per share. These derivative exercises converted part of his option awards into common stock before the reported open-market sale.

Does Mark A. Maples still hold GREAT SOUTHERN BANCORP (GSBC) common stock after these transactions?

After the reported sale, his directly held GSBC common stock balance in the filing is 0 shares. However, he continues to hold stock options that are exercisable for underlying common shares, subject to future vesting and expiration dates.

What GSBC stock options does Mark A. Maples retain after these transactions?

He retains options over 13,200 GSBC underlying common shares, with exercise prices of $57.29, $61.79, and $53.22. These options expire between November 2033 and November 2035 and vest in annual tranches from 2025 through 2030.

How do the vesting schedules affect Mark A. Maples’s remaining GSBC options?

Footnotes state tranches of 1,187 or 1,200 GSBC shares vest on specified November dates from 2025 through 2030. This means his ability to exercise remaining options increases gradually over several years as each annual installment vests.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Accepted by SEC EDGAR 05/04/2026 - 04:35 PM Learn about SEC filing dates

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
Estimated average burden
hours per response:			0.5

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^*

Maples Mark A

(Last) (First) (Middle)

CARE OF GREAT SOUTHERN BANK

218 S. GLENSTONE AVE

(Street)

SPRINGFIELD MISSOURI 65802

(City) (State) (Zip)

UNITED STATES

(Country)

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
	Officer (give title below)	X	Other (specify below)
			Vice President of Subsidiary

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
05/01/2026

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

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

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

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	05/01/2026		M		1,187	A	$57.98	1,187	D
Common Stock	05/01/2026		M		1,200	A	$61.55	2,387	D
Common Stock	05/01/2026		S		2,387	D	$68.955	0	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	$57.98	05/01/2026		M			1,187	(1)	11/17/2031	Common stock	2,374	$57.98	1,187	D
Option to purchase	$61.55	05/01/2026		M			1,200	(2)	11/16/2032	Common stock	3,600	$61.55	3,587	D
Option to purchase	$53.22							(3)	11/15/2033	Common stock	3,600		7,187	D
Option to purchase	$61.79							(4)	11/20/2034	Common stock	4,800		11,987	D
Option to purchase	$57.29							(5)	11/19/2035	Common stock	4,800		16,787	D

Explanation of Responses:

1. 1,187 shares vest on 11/17/2025 and 11/17/2026

2. 1,200 shares vest on 11/16/2025, 11/16/2026 and 11/16/2027

3. 1,200 shares vest on 11/15/2026, 11/15/2027 and 11/15/2028

4. 1,200 shares vest on 11/20/2026, 11/20/2027, 11/20/2028 and 11/20/2029

5. 1,200 shares vest on 11/19/2027, 11/19/2028, 11/19/2029 and 11/19/2030

Remarks:

	Matt Snyder, by Power of Attorney from Mark A Maples	05/04/2026
	** 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.
* Form 4: SEC 1474 (03-26)