COPELAND REX A (Treasurer) sold 10.2% of their position (2.95K shares) of GREAT SOUTHERN BANCORP, INC. on the open market

Open‑market sale worth $201.8K — a moderate reduction. Review remaining holdings and any 10b5‑1 plan disclosures.

S · 2 sales

COPELAND REX A

Filed: 5/1/2026ACC: 0001214659-26-005421

InsiderCOPELAND REX ACIK 1108323

→

IssuerGREAT SOUTHERN BANCORP, INC.CIK 854560

OfficerOther· Treasurer

Since Nov 2018

-2.95K

Net shares

Net seller

$201.8K

Total sold

Open market trades

0B · 2S

Total transactions

4.20K acquired · 7.15K disposed

Non-Derivative Transactions5

Common stock

Direct

M · Option Exercise

+2.04K

Price / share

$52.20

Trade value

$106.28K

% of position

8.3%

4/30/2026

24.67K→26.71K

Common stock

Direct

S · Sale

−2.04K

Price / share

$68.25

Trade value

$138.96K

% of position

7.6%

4/30/2026

26.71K→24.67K

Common stock

Direct

M · Option Exercise

+1.25K

Price / share

$52.20

Trade value

$65.25K

% of position

5.1%

5/1/2026

24.67K→25.92K

Common stock

Direct

M · Option Exercise

+914.00

Price / share

$52.20

Trade value

$47.71K

% of position

3.5%

5/1/2026

25.92K→26.84K

Common stock

Direct

S · Sale

−914.00

Price / share

$68.77

Trade value

$62.86K

% of position

3.4%

5/1/2026

26.84K→25.92K

Total

Net shares

+1.25K

Net value

$17.43K

Security	Date	Type	Shares	Price / Share	Trade Value	% of Position	Held Before	Held After
Common stock Direct	4/30/2026	M · Option Exercise	+2.04K	$52.20	$106.28K	8.3%	24.67K	26.71K
Common stock Direct	4/30/2026	S · Sale	−2.04K	$68.25	$138.96K	7.6%	26.71K	24.67K
Common stock Direct	5/1/2026	M · Option Exercise	+1.25K	$52.20	$65.25K	5.1%	24.67K	25.92K
Common stock Direct	5/1/2026	M · Option Exercise	+914.00	$52.20	$47.71K	3.5%	25.92K	26.84K
Common stock Direct	5/1/2026	S · Sale	−914.00	$68.77	$62.86K	3.4%	26.84K	25.92K
Total			+1.25K		$17.43K

Derivative Transactions3

Option to purchase

Direct

M · Option Exercise

Converts to

Common Stock

2.04K shares

−2.04K

Strike price

52.2

Held after

2.16K

Exercisable

—

4/30/2026

Option to purchase

Direct

M · Option Exercise

Converts to

Common Stock

1.25K shares

−1.25K

Strike price

52.2

Held after

914.00

Exercisable

—

5/1/2026

Option to purchase

Direct

M · Option Exercise

Converts to

Common Stock

914.00 shares

−914.00

Strike price

52.2

Held after

0.00

Exercisable

—

5/1/2026

Security	Converts To	Date	Type	Shares	Strike Price	Exercisable	Held After
Option to purchase Direct	Common Stock2.04K shares	4/30/2026	M · Option Exercise	−2.04K	52.2	—	2.16K
Option to purchase Direct	Common Stock1.25K shares	5/1/2026	M · Option Exercise	−1.25K	52.2	—	914.00
Option to purchase Direct	Common Stock914.00 shares	5/1/2026	M · Option Exercise	−914.00	52.2	—	0.00

Non-Derivative Holdings (Post-Transaction)0

No non-derivative holdings reported

Derivative Holdings (Post-Transaction)5

Option to purchase

Direct

Underlying security

Common stock

Underlying shares

4.50K

Shares owned

12.90K

Exercise price

41.74

Expiration

—

Exercise window

—

Option to purchase

Direct

Underlying security

Common stock

Underlying shares

4.75K

Shares owned

17.65K

Exercise price

57.98

Expiration

—

Exercise window

—

Option to purchase

Direct

Underlying security

Common stock

Underlying shares

4.80K

Shares owned

22.45K

Exercise price

61.55

Expiration

—

Exercise window

—

Option to purchase

Direct

Underlying security

Common stock

Underlying shares

4.20K

Shares owned

8.40K

Exercise price

60.15

Expiration

—

Exercise window

—

Option to purchase

Direct

Underlying security

Common stock

Underlying shares

4.20K

Shares owned

4.20K

Exercise price

Expiration

—

Exercise window

—

Total

Underlying

22.45K

Owned

65.60K

Security	Underlying	Exercise Price	Exercise Window	Expiration	Underlying Shares	Shares Owned
Option to purchase Direct	Common stock	41.74	—	—	4.50K	12.90K
Option to purchase Direct	Common stock	57.98	—	—	4.75K	17.65K
Option to purchase Direct	Common stock	61.55	—	—	4.80K	22.45K
Option to purchase Direct	Common stock	60.15	—	—	4.20K	8.40K
Option to purchase Direct	Common stock	55	—	—	4.20K	4.20K
Total					22.45K	65.60K