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 $364.4K — a minor trim. Review remaining holdings and any 10b5‑1 plan disclosures.

S · 1 sale

TURNER JOSEPH W

Filed: 1/27/2026ACC: 0001214659-26-000883

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

$364.4K

Total sold

Open market trades

0B · 1S

Total transactions

6.02K acquired · 12K disposed

Non-Derivative Transactions3

Common stock

Indirect

J · J

+18.00

Price / share

$62.78

Trade value

$1.13K

% of position

0.2%

1/13/2026

11.36K→11.38K

Common stock

Direct

M · Option Exercise

+6K

Price / share

$41.30

Trade value

$247.80K

% of position

4.4%

1/26/2026

137.38K→143.38K

Common stock

Direct

S · Sale

−6K

Price / share

$60.74

Trade value

$364.43K

% of position

4.2%

1/26/2026

143.38K→137.38K

Total

Net shares

+18.00

Net value

-$115.50K

Security	Date	Type	Shares	Price / Share	Trade Value	% of Position	Held Before	Held After
Common stock Indirect	1/13/2026	J · J	+18.00	$62.78	$1.13K	0.2%	11.36K	11.38K
Common stock Direct	1/26/2026	M · Option Exercise	+6K	$41.30	$247.80K	4.4%	137.38K	143.38K
Common stock Direct	1/26/2026	S · Sale	−6K	$60.74	$364.43K	4.2%	143.38K	137.38K
Total			+18.00		-$115.50K

Derivative Transactions1

Option to purchase

Direct

M · Option Exercise

Converts to

Common Stock

6K shares

−6K

Strike price

41.3

Held after

0.00

Exercisable

—

1/26/2026

Security	Converts To	Date	Type	Shares	Strike Price	Exercisable	Held After
Option to purchase Direct	Common Stock6K shares	1/26/2026	M · Option Exercise	−6K	41.3	—	0.00

Non-Derivative Holdings (Post-Transaction)3

Common stock

Indirect

Shares owned2.48K

Common stock

Indirect

Shares owned369.74K

Common stock

Indirect

Shares owned18.34K

Total

390.55K indirect390.55K

Security Title	Shares Owned	Ownership Type
Common stock	2.48K	Indirect
Common stock	369.74K	Indirect
Common stock	18.34K	Indirect
Total	390.55K	390.55K indirect

Derivative Holdings (Post-Transaction)9

Option to purchase

Direct

Underlying security

Common Stock

Underlying shares

Shares owned

Exercise price

52.2

Expiration

—

Exercise window

—

Option to purchase

Direct

Underlying security

Common stock

Underlying shares

7.80K

Shares owned

43.05K

Exercise price

61.55

Expiration

—

Exercise window

—

Option to purchase

Direct

Underlying security

Common stock

Underlying shares

7.80K

Shares owned

58.65K

Exercise price

61.79

Expiration

—

Exercise window

—

Option to purchase

Direct

Underlying security

Common stock

Underlying shares

7.80K

Shares owned

66.45K

Exercise price

57.29

Expiration

—

Exercise window

—

Option to purchase

Direct

Underlying security

Common stock

Underlying shares

7.75K

Shares owned

35.25K

Exercise price

57.98

Expiration

—

Exercise window

—

Option to purchase

Direct

Underlying security

Common stock

Underlying shares

7.50K

Shares owned

27.50K

Exercise price

41.74

Expiration

—

Exercise window

—

Option to purchase

Direct

Underlying security

Common stock

Underlying shares

Shares owned

20K

Exercise price

60.15

Expiration

—

Exercise window

—

Option to purchase

Direct

Underlying security

Common Stock

Underlying shares

7.80K

Shares owned

50.85K

Exercise price

53.22

Expiration

—

Exercise window

—

Option to purchase

Direct

Underlying security

Common Stock

Underlying shares

Shares owned

13K

Exercise price

Expiration

—

Exercise window

—

Total

Underlying

66.45K

Owned

320.75K

Security	Underlying	Exercise Price	Exercise Window	Expiration	Underlying Shares	Shares Owned
Option to purchase Direct	Common Stock	52.2	—	—	6K	6K
Option to purchase Direct	Common stock	61.55	—	—	7.80K	43.05K
Option to purchase Direct	Common stock	61.79	—	—	7.80K	58.65K
Option to purchase Direct	Common stock	57.29	—	—	7.80K	66.45K
Option to purchase Direct	Common stock	57.98	—	—	7.75K	35.25K
Option to purchase Direct	Common stock	41.74	—	—	7.50K	27.50K
Option to purchase Direct	Common stock	60.15	—	—	7K	20K
Option to purchase Direct	Common Stock	53.22	—	—	7.80K	50.85K
Option to purchase Direct	Common Stock	55	—	—	7K	13K
Total					66.45K	320.75K