STEINERT EARL A JR sold 0.5% of their position (4.50K shares) of GREAT SOUTHERN BANCORP, INC. on the open market

Open‑market sale worth $322.3K — a minor trim. Review remaining holdings and any 10b5‑1 plan disclosures.

S · 1 sale

STEINERT EARL A JR

Filed: 5/26/2026ACC: 0001214659-26-006741

InsiderSTEINERT EARL A JRCIK 1284362

→

IssuerGREAT SOUTHERN BANCORP, INC.CIK 854560

Director

Since Nov 2018

-4.50K

Net shares

Net seller

$322.3K

Total sold

Open market trades

0B · 1S

Total transactions

4.50K acquired · 9K disposed

Non-Derivative Transactions4

Common stock

Direct

M · Option Exercise

+2K

Price / share

$60.15

Trade value

$120.30K

% of position

0.2%

5/26/2026

939.60K→941.60K

Common stock

Direct

M · Option Exercise

+1.50K

Price / share

$57.98

Trade value

$86.97K

% of position

0.2%

5/26/2026

941.60K→943.10K

Common stock

Direct

M · Option Exercise

+1K

Price / share

$61.55

Trade value

$61.55K

% of position

0.1%

5/26/2026

943.10K→944.10K

Common stock

Direct

S · Sale

−4.50K

Price / share

$71.62

Trade value

$322.27K

% of position

0.5%

5/26/2026

944.10K→939.60K

Total

Net shares

+0.00

Net value

-$53.45K

Security	Date	Type	Shares	Price / Share	Trade Value	% of Position	Held Before	Held After
Common stock Direct	5/26/2026	M · Option Exercise	+2K	$60.15	$120.30K	0.2%	939.60K	941.60K
Common stock Direct	5/26/2026	M · Option Exercise	+1.50K	$57.98	$86.97K	0.2%	941.60K	943.10K
Common stock Direct	5/26/2026	M · Option Exercise	+1K	$61.55	$61.55K	0.1%	943.10K	944.10K
Common stock Direct	5/26/2026	S · Sale	−4.50K	$71.62	$322.27K	0.5%	944.10K	939.60K
Total			+0.00		-$53.45K

Derivative Transactions3

Option to purchase

Direct

M · Option Exercise

Converts to

Common stock

2K shares

−2K

Strike price

60.15

Held after

0.00

Exercisable

—

5/26/2026

Option to purchase

Direct

M · Option Exercise

Converts to

Common stock

2K shares

−1.50K

Strike price

57.98

Held after

500.00

Exercisable

—

5/26/2026

Option to purchase

Direct

M · Option Exercise

Converts to

Common stock

2K shares

−1K

Strike price

61.55

Held after

1.50K

Exercisable

—

5/26/2026

Security	Converts To	Date	Type	Shares	Strike Price	Exercisable	Held After
Option to purchase Direct	Common stock2K shares	5/26/2026	M · Option Exercise	−2K	60.15	—	0.00
Option to purchase Direct	Common stock2K shares	5/26/2026	M · Option Exercise	−1.50K	57.98	—	500.00
Option to purchase Direct	Common stock2K shares	5/26/2026	M · Option Exercise	−1K	61.55	—	1.50K

Non-Derivative Holdings (Post-Transaction)0

No non-derivative holdings reported

Derivative Holdings (Post-Transaction)3

Option to purchase

Direct

Underlying security

Common stock

Underlying shares

1.50K

Shares owned

Exercise price

53.22

Expiration

—

Exercise window

—

Option to purchase

Direct

Underlying security

Common stock

Underlying shares

Shares owned

Exercise price

61.79

Expiration

—

Exercise window

—

Option to purchase

Direct

Underlying security

Common stock

Underlying shares

Shares owned

Exercise price

57.29

Expiration

—

Exercise window

—

Total

Underlying

5.50K

Owned

15K

Security	Underlying	Exercise Price	Exercise Window	Expiration	Underlying Shares	Shares Owned
Option to purchase Direct	Common stock	53.22	—	—	1.50K	3K
Option to purchase Direct	Common stock	61.79	—	—	2K	5K
Option to purchase Direct	Common stock	57.29	—	—	2K	7K
Total					5.50K	15K