TURNER JOSEPH W (President/CEO) sold 4.2% of their position (6K shares) of GREAT SOUTHERN BANCORP, INC. on the open market

Open‑market sale worth $409.0K — a minor trim. Review remaining holdings and any 10b5‑1 plan disclosures.

S · 1 sale

TURNER JOSEPH W

Filed: 5/1/2026ACC: 0001214659-26-005420

InsiderTURNER JOSEPH WCIK 1044047

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IssuerGREAT SOUTHERN BANCORP, INC.CIK 854560

DirectorOfficer10% Owner· President/CEO

Since Aug 2018

-5.98K

Net shares

Net seller

$409.0K

Total sold

Open market trades

0B · 1S

Total transactions

6.02K acquired · 12K disposed

Non-Derivative Transactions3

Common stock

Indirect

J · J

+17.00

Price / share

$67.57

Trade value

$1.15K

% of position

0.1%

4/14/2026

11.38K→11.39K

Common stock

Direct

M · Option Exercise

+6K

Price / share

$52.20

Trade value

$313.20K

% of position

4.4%

4/30/2026

136.18K→142.18K

Common stock

Direct

S · Sale

−6K

Price / share

$68.16

Trade value

$408.96K

% of position

4.2%

4/30/2026

142.18K→136.18K

Total

Net shares

+17.00

Net value

-$94.61K

Security	Date	Type	Shares	Price / Share	Trade Value	% of Position	Held Before	Held After
Common stock Indirect	4/14/2026	J · J	+17.00	$67.57	$1.15K	0.1%	11.38K	11.39K
Common stock Direct	4/30/2026	M · Option Exercise	+6K	$52.20	$313.20K	4.4%	136.18K	142.18K
Common stock Direct	4/30/2026	S · Sale	−6K	$68.16	$408.96K	4.2%	142.18K	136.18K
Total			+17.00		-$94.61K

Derivative Transactions1

Option to purchase

Direct

M · Option Exercise

Converts to

Common Stock

6K shares

−6K

Strike price

52.2

Held after

0.00

Exercisable

—

4/30/2026

Security	Converts To	Date	Type	Shares	Strike Price	Exercisable	Held After
Option to purchase Direct	Common Stock6K shares	4/30/2026	M · Option Exercise	−6K	52.2	—	0.00

Non-Derivative Holdings (Post-Transaction)3

Common stock

Indirect

Shares owned369.74K

Common stock

Indirect

Shares owned18.56K

Common stock

Indirect

Shares owned2.48K

Total

390.78K indirect390.78K

Security Title	Shares Owned	Ownership Type
Common stock	369.74K	Indirect
Common stock	18.56K	Indirect
Common stock	2.48K	Indirect
Total	390.78K	390.78K indirect

Derivative Holdings (Post-Transaction)8

Option to purchase

Direct

Underlying security

Common stock

Underlying shares

7.80K

Shares owned

52.65K

Exercise price

61.79

Expiration

—

Exercise window

—

Option to purchase

Direct

Underlying security

Common stock

Underlying shares

7.80K

Shares owned

37.05K

Exercise price

61.55

Expiration

—

Exercise window

—

Option to purchase

Direct

Underlying security

Common stock

Underlying shares

7.75K

Shares owned

29.25K

Exercise price

57.98

Expiration

—

Exercise window

—

Option to purchase

Direct

Underlying security

Common stock

Underlying shares

7.80K

Shares owned

60.45K

Exercise price

57.29

Expiration

—

Exercise window

—

Option to purchase

Direct

Underlying security

Common stock

Underlying shares

7.50K

Shares owned

21.50K

Exercise price

41.74

Expiration

—

Exercise window

—

Option to purchase

Direct

Underlying security

Common stock

Underlying shares

Shares owned

14K

Exercise price

60.15

Expiration

—

Exercise window

—

Option to purchase

Direct

Underlying security

Common Stock

Underlying shares

Shares owned

Exercise price

Expiration

—

Exercise window

—

Option to purchase

Direct

Underlying security

Common Stock

Underlying shares

7.80K

Shares owned

44.85K

Exercise price

53.22

Expiration

—

Exercise window

—

Total

Underlying

60.45K

Owned

266.75K

Security	Underlying	Exercise Price	Exercise Window	Expiration	Underlying Shares	Shares Owned
Option to purchase Direct	Common stock	61.79	—	—	7.80K	52.65K
Option to purchase Direct	Common stock	61.55	—	—	7.80K	37.05K
Option to purchase Direct	Common stock	57.98	—	—	7.75K	29.25K
Option to purchase Direct	Common stock	57.29	—	—	7.80K	60.45K
Option to purchase Direct	Common stock	41.74	—	—	7.50K	21.50K
Option to purchase Direct	Common stock	60.15	—	—	7K	14K
Option to purchase Direct	Common Stock	55	—	—	7K	7K
Option to purchase Direct	Common Stock	53.22	—	—	7.80K	44.85K
Total					60.45K	266.75K