Otter Tail Corp — Director's Dealing 2026

Feb 9, 2026

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: Otter Tail Corp (OTTR)
CIK: 0001466593
Period of Report: 2026-02-06

Reporting Person: Smestad Jennifer O. (VP, General Council & Corp Sec)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2026-02-06	Common Stock	M	1150	—	Acquired	16709	Direct
2026-02-06	Common Stock	F	541	$87.83	Disposed	16168	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2026-02-06	Restricted Stock Units	$	M	275	Disposed		Common Stock (0)	Direct
2026-02-06	Restricted Stock Units	$	M	325	Disposed		Common Stock (325)	Direct
2026-02-06	Restricted Stock Units	$	M	250	Disposed		Common Stock (500)	Direct
2026-02-06	Restricted Stock Units	$	M	300	Disposed		Common Stock (900)	Direct

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock	488	Indirect

Footnotes

F1: Each restricted stock unit represents a contingent right to receive one share of Otter Tail Corporation stock.

F2: These shares were withheld by the Corporation to pay taxes due upon vesting of this award, exempt pursuant to Rule 16b-3(e).

F3: Total direct holdings include shares held jointly with spouse and shares acquired through the Employee Stock Purchase Plan, the Dividend Reinvestment Plan, and shares acquired pursuant to Restricted Stock Awards and Performance Share Awards.

F4: The restricted stock units vest in four equal annual installments beginning the date shown above.