COPELAND REX A (Treasurer) sold 6.8% of their position (1.80K shares) of GREAT SOUTHERN BANCORP, INC. on the open market

Open‑market sale worth $114.4K — a moderate reduction. Review remaining holdings and any 10b5‑1 plan disclosures.

S · 1 sale

COPELAND REX A

Filed: 2/6/2026ACC: 0001214659-26-001296

InsiderCOPELAND REX ACIK 1108323

→

IssuerGREAT SOUTHERN BANCORP, INC.CIK 854560

OfficerOther· Treasurer

Since Nov 2018

-1.80K

Net shares

Net seller

$114.4K

Total sold

Open market trades

0B · 1S

Total transactions

1.80K acquired · 3.59K disposed

Non-Derivative Transactions2

Common stock

Direct

M · Option Exercise

+1.80K

Price / share

$41.30

Trade value

$74.22K

% of position

7.3%

2/6/2026

24.67K→26.47K

Common stock

Direct

S · Sale

−1.80K

Price / share

$63.67

Trade value

$114.42K

% of position

6.8%

2/6/2026

26.47K→24.67K

Total

Net shares

+0.00

Net value

-$40.20K

Security	Date	Type	Shares	Price / Share	Trade Value	% of Position	Held Before	Held After
Common stock Direct	2/6/2026	M · Option Exercise	+1.80K	$41.30	$74.22K	7.3%	24.67K	26.47K
Common stock Direct	2/6/2026	S · Sale	−1.80K	$63.67	$114.42K	6.8%	26.47K	24.67K
Total			+0.00		-$40.20K

Derivative Transactions1

Option to purchase

Direct

M · Option Exercise

Converts to

Common Stock

1.80K shares

−1.80K

Strike price

41.3

Held after

0.00

Exercisable

—

2/6/2026

Security	Converts To	Date	Type	Shares	Strike Price	Exercisable	Held After
Option to purchase Direct	Common Stock1.80K shares	2/6/2026	M · Option Exercise	−1.80K	41.3	—	0.00

Non-Derivative Holdings (Post-Transaction)0

No non-derivative holdings reported

Derivative Holdings (Post-Transaction)6

Option to purchase

Direct

Underlying security

Common Stock

Underlying shares

4.20K

Shares owned

4.20K

Exercise price

52.2

Expiration

—

Exercise window

—

Option to purchase

Direct

Underlying security

Common stock

Underlying shares

4.20K

Shares owned

12.60K

Exercise price

60.15

Expiration

—

Exercise window

—

Option to purchase

Direct

Underlying security

Common stock

Underlying shares

4.20K

Shares owned

8.40K

Exercise price

Expiration

—

Exercise window

—

Option to purchase

Direct

Underlying security

Common stock

Underlying shares

4.75K

Shares owned

21.85K

Exercise price

57.98

Expiration

—

Exercise window

—

Option to purchase

Direct

Underlying security

Common stock

Underlying shares

4.50K

Shares owned

17.10K

Exercise price

41.74

Expiration

—

Exercise window

—

Option to purchase

Direct

Underlying security

Common stock

Underlying shares

4.80K

Shares owned

26.65K

Exercise price

61.55

Expiration

—

Exercise window

—

Total

Underlying

26.65K

Owned

90.80K

Security	Underlying	Exercise Price	Exercise Window	Expiration	Underlying Shares	Shares Owned
Option to purchase Direct	Common Stock	52.2	—	—	4.20K	4.20K
Option to purchase Direct	Common stock	60.15	—	—	4.20K	12.60K
Option to purchase Direct	Common stock	55	—	—	4.20K	8.40K
Option to purchase Direct	Common stock	57.98	—	—	4.75K	21.85K
Option to purchase Direct	Common stock	41.74	—	—	4.50K	17.10K
Option to purchase Direct	Common stock	61.55	—	—	4.80K	26.65K
Total					26.65K	90.80K