WAHLUND TODD R (Chief Financial Officer) exercised options at OTTER TAIL CORP

Option exercise — a mechanical event triggered by vesting or expiry. Not a discretionary conviction trade.

M · 1 exercise

WAHLUND TODD R

Filed: 2/9/2026ACC: 0002002077-26-000002

InsiderWAHLUND TODD RCIK 2002077

→

IssuerOTTER TAIL CORPCIK 1466593

Officer· Chief Financial Officer

Since Feb 2026

-119.00

Net shares

Net seller

$10.5K

Total sold

Open market trades

0B · 0S

Total transactions

675.00 acquired · 794.00 disposed

Non-Derivative Transactions2

Common Stock

Direct

M · Option Exercise

+675.00

Price / share

—

Trade value

—

% of position

7.1%

2/6/2026

9.47K→10.15K

Common Stock

Direct

F · Tax Withholding

−119.00

Price / share

$87.83

Trade value

$10.45K

% of position

1.2%

2/6/2026

10.15K→10.03K

Total

Net shares

+556.00

Net value

-$10.45K

Security	Date	Type	Shares	Price / Share	Trade Value	% of Position	Held Before	Held After
Common Stock Direct	2/6/2026	M · Option Exercise	+675.00	—	—	7.1%	9.47K	10.15K
Common Stock Direct	2/6/2026	F · Tax Withholding	−119.00	$87.83	$10.45K	1.2%	10.15K	10.03K
Total			+556.00		-$10.45K

Derivative Transactions2

Restricted Stock Units

Direct

M · Option Exercise

Converts to

Common Stock

600.00 shares

−300.00

Strike price

Held after

600.00

Exercisable

—

2/6/2026

Restricted Stock Units

Direct

M · Option Exercise

Converts to

Common Stock

1.13K shares

−375.00

Strike price

Held after

1.13K

Exercisable

—

2/6/2026

Security	Converts To	Date	Type	Shares	Strike Price	Exercisable	Held After
Restricted Stock Units Direct	Common Stock600.00 shares	2/6/2026	M · Option Exercise	−300.00		—	600.00
Restricted Stock Units Direct	Common Stock1.13K shares	2/6/2026	M · Option Exercise	−375.00		—	1.13K

Non-Derivative Holdings (Post-Transaction)2

Common Stock

Indirect

Shares owned7.00

Common Stock

Indirect

Shares owned3.05K

Total

3.06K indirect3.06K

Security Title	Shares Owned	Ownership Type
Common Stock	7.00	Indirect
Common Stock	3.05K	Indirect
Total	3.06K	3.06K indirect

Derivative Holdings (Post-Transaction)2

Restricted Stock Units

Direct

Underlying security

Common Stock

Underlying shares

460.00

Shares owned

460.00

Exercise price

Expiration

—

Exercise window

—

Restricted Stock Units

Direct

Underlying security

Common Stock

Underlying shares

600.00

Shares owned

600.00

Exercise price

Expiration

—

Exercise window

—

Total

Underlying

1.06K

Owned

1.06K

Security	Underlying	Exercise Window	Expiration	Underlying Shares	Shares Owned
Restricted Stock Units Direct	Common Stock	—	—	460.00	460.00
Restricted Stock Units Direct	Common Stock	—	—	600.00	600.00
Total				1.06K	1.06K