MACFARLANE CHARLES S (President & CEO) received a stock award from OTTER TAIL CORP

Compensation award — not an open‑market transaction. Less informative as a directional signal.

A · 1 award

MACFARLANE CHARLES S

Filed: 2/12/2026ACC: 0001278053-26-000005

InsiderMACFARLANE CHARLES SCIK 1278053

→

IssuerOTTER TAIL CORPCIK 1466593

Officer· President & CEO

Since Feb 2019

+33.59K

Net shares

Net buyer

$2.03M

Total sold

Open market trades

0B · 0S

Total transactions

57.10K acquired · 23.52K disposed

Non-Derivative Transactions2

Common Stock

Direct

A · Award

+47.70K

Price / share

$86.43

Trade value

$4.12M

% of position

21.0%

2/11/2026

227.41K→275.11K

Common Stock

Direct

F · Tax Withholding

−23.52K

Price / share

$86.43

Trade value

$2.03M

% of position

8.5%

2/11/2026

275.11K→251.60K

Total

Net shares

+24.18K

Net value

$2.09M

Security	Date	Type	Shares	Price / Share	Trade Value	% of Position	Held Before	Held After
Common Stock Direct	2/11/2026	A · Award	+47.70K	$86.43	$4.12M	21.0%	227.41K	275.11K
Common Stock Direct	2/11/2026	F · Tax Withholding	−23.52K	$86.43	$2.03M	8.5%	275.11K	251.60K
Total			+24.18K		$2.09M

Derivative Transactions1

Restricted Stock Units

Direct

A · Award

Converts to

Common Stock

9.40K shares

+9.40K

Strike price

Held after

9.40K

Exercisable

—

2/10/2026

Security	Converts To	Date	Type	Shares	Strike Price	Exercisable	Held After
Restricted Stock Units Direct	Common Stock9.40K shares	2/10/2026	A · Award	+9.40K		—	9.40K

Non-Derivative Holdings (Post-Transaction)2

Common Stock

Indirect

Shares owned3.05K

Common Stock

Indirect

Shares owned75.46K

Total

78.51K indirect78.51K

Security Title	Shares Owned	Ownership Type
Common Stock	3.05K	Indirect
Common Stock	75.46K	Indirect
Total	78.51K	78.51K indirect

Derivative Holdings (Post-Transaction)3

Restricted Stock Units

Direct

Underlying security

Common Stock

Underlying shares

3.95K

Shares owned

3.95K

Exercise price

Expiration

—

Exercise window

—

Restricted Stock Units

Direct

Underlying security

Common Stock

Underlying shares

7.42K

Shares owned

7.42K

Exercise price

Expiration

—

Exercise window

—

Restricted Stock Units

Direct

Underlying security

Common Stock

Underlying shares

2.50K

Shares owned

2.50K

Exercise price

Expiration

—

Exercise window

—

Total

Underlying

13.88K

Owned

13.88K

Security	Underlying	Exercise Window	Expiration	Underlying Shares	Shares Owned
Restricted Stock Units Direct	Common Stock	—	—	3.95K	3.95K
Restricted Stock Units Direct	Common Stock	—	—	7.42K	7.42K
Restricted Stock Units Direct	Common Stock	—	—	2.50K	2.50K
Total				13.88K	13.88K