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: 4/9/2026ACC: 0002002077-26-000007

InsiderWAHLUND TODD RCIK 2002077

→

IssuerOTTER TAIL CORPCIK 1466593

Officer· Chief Financial Officer

Since Feb 2026

-186.00

Net shares

Net seller

$16.8K

Total sold

Open market trades

0B · 0S

Total transactions

460.00 acquired · 646.00 disposed

Non-Derivative Transactions2

Common Stock

Direct

M · Option Exercise

+460.00

Price / share

$90.11

Trade value

$41.45K

% of position

4.6%

4/8/2026

10.07K→10.53K

Common Stock

Direct

F · Tax Withholding

−186.00

Price / share

$90.11

Trade value

$16.76K

% of position

1.8%

4/8/2026

10.53K→10.35K

Total

Net shares

+274.00

Net value

$24.69K

Security	Date	Type	Shares	Price / Share	Trade Value	% of Position	Held Before	Held After
Common Stock Direct	4/8/2026	M · Option Exercise	+460.00	$90.11	$41.45K	4.6%	10.07K	10.53K
Common Stock Direct	4/8/2026	F · Tax Withholding	−186.00	$90.11	$16.76K	1.8%	10.53K	10.35K
Total			+274.00		$24.69K

Derivative Transactions1

Restricted Stock Units

Direct

M · Option Exercise

Converts to

Common Stock

460.00 shares

−460.00

Strike price

Held after

0.00

Exercisable

—

4/8/2026

Security	Converts To	Date	Type	Shares	Strike Price	Exercisable	Held After
Restricted Stock Units Direct	Common Stock460.00 shares	4/8/2026	M · Option Exercise	−460.00		—	0.00

Non-Derivative Holdings (Post-Transaction)2

Common Stock

Indirect

Shares owned3.07K

Common Stock

Indirect

Shares owned7.00

Total

3.08K indirect3.08K

Security Title	Shares Owned	Ownership Type
Common Stock	3.07K	Indirect
Common Stock	7.00	Indirect
Total	3.08K	3.08K indirect

Derivative Holdings (Post-Transaction)4

Restricted Stock Units

Direct

Underlying security

Common Stock

Underlying shares

600.00

Shares owned

600.00

Exercise price

Expiration

—

Exercise window

—

Restricted Stock Units

Direct

Underlying security

Common Stock

Underlying shares

1.13K

Shares owned

1.13K

Exercise price

Expiration

—

Exercise window

—

Restricted Stock Units

Direct

Underlying security

Common Stock

Underlying shares

1.40K

Shares owned

1.40K

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

3.73K

Owned

3.73K

Security	Underlying	Exercise Window	Expiration	Underlying Shares	Shares Owned
Restricted Stock Units Direct	Common Stock	—	—	600.00	600.00
Restricted Stock Units Direct	Common Stock	—	—	1.13K	1.13K
Restricted Stock Units Direct	Common Stock	—	—	1.40K	1.40K
Restricted Stock Units Direct	Common Stock	—	—	600.00	600.00
Total				3.73K	3.73K