STEINERT EARL A JR sold 0.2% of their position (1.50K shares) of GREAT SOUTHERN BANCORP, INC. on the open market

Open‑market sale worth $95.2K — a minor trim. Review remaining holdings and any 10b5‑1 plan disclosures.

S · 1 sale

STEINERT EARL A JR

Filed: 2/4/2026ACC: 0001214659-26-001190

InsiderSTEINERT EARL A JRCIK 1284362

→

IssuerGREAT SOUTHERN BANCORP, INC.CIK 854560

Director

Since Nov 2018

-1.50K

Net shares

Net seller

$95.2K

Total sold

Open market trades

0B · 1S

Total transactions

1.50K acquired · 3K disposed

Non-Derivative Transactions3

Common stock

Direct

M · Option Exercise

+1K

Price / share

$41.74

Trade value

$41.74K

% of position

0.1%

2/4/2026

939.60K→940.60K

Common stock

Direct

M · Option Exercise

+500.00

Price / share

$53.22

Trade value

$26.61K

% of position

0.1%

2/4/2026

940.60K→941.10K

Common stock

Direct

S · Sale

−1.50K

Price / share

$63.49

Trade value

$95.24K

% of position

0.2%

2/4/2026

941.10K→939.60K

Total

Net shares

+0.00

Net value

-$26.89K

Security	Date	Type	Shares	Price / Share	Trade Value	% of Position	Held Before	Held After
Common stock Direct	2/4/2026	M · Option Exercise	+1K	$41.74	$41.74K	0.1%	939.60K	940.60K
Common stock Direct	2/4/2026	M · Option Exercise	+500.00	$53.22	$26.61K	0.1%	940.60K	941.10K
Common stock Direct	2/4/2026	S · Sale	−1.50K	$63.49	$95.24K	0.2%	941.10K	939.60K
Total			+0.00		-$26.89K

Derivative Transactions2

Option to purchase

Direct

M · Option Exercise

Converts to

Common stock

1K shares

−1K

Strike price

41.74

Held after

Exercisable

—

2/4/2026

Option to purchase

Direct

M · Option Exercise

Converts to

Common stock

2K shares

−500.00

Strike price

53.22

Held after

7.50K

Exercisable

—

2/4/2026

Security	Converts To	Date	Type	Shares	Strike Price	Exercisable	Held After
Option to purchase Direct	Common stock1K shares	2/4/2026	M · Option Exercise	−1K	41.74	—	2K
Option to purchase Direct	Common stock2K shares	2/4/2026	M · Option Exercise	−500.00	53.22	—	7.50K

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

Shares owned

Exercise price

57.98

Expiration

—

Exercise window

—

Option to purchase

Direct

Underlying security

Common stock

Underlying shares

Shares owned

9.50K

Exercise price

61.79

Expiration

—

Exercise window

—

Option to purchase

Direct

Underlying security

Common stock

Underlying shares

Shares owned

11.50K

Exercise price

57.29

Expiration

—

Exercise window

—

Option to purchase

Direct

Underlying security

Common stock

Underlying shares

Shares owned

Exercise price

61.55

Expiration

—

Exercise window

—

Option to purchase

Direct

Underlying security

Common stock

Underlying shares

Shares owned

Exercise price

60.15

Expiration

—

Exercise window

—

Total

Underlying

10K

Owned

33K

Security	Underlying	Exercise Price	Exercise Window	Expiration	Underlying Shares	Shares Owned
Option to purchase Direct	Common stock	57.98	—	—	2K	4K
Option to purchase Direct	Common stock	61.79	—	—	2K	9.50K
Option to purchase Direct	Common stock	57.29	—	—	2K	11.50K
Option to purchase Direct	Common stock	61.55	—	—	2K	6K
Option to purchase Direct	Common stock	60.15	—	—	2K	2K
Total					10K	33K