Otter Tail Corp — Director's Dealing 2026

Feb 12, 2026

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: Otter Tail Corp (OTTR)
CIK: 0001466593
Period of Report: 2026-02-10

Reporting Person: KNUTSON PAUL L (VP, Human Resources)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2026-02-11	Common Stock	A	3600	$86.43	Acquired	26575	Direct
2026-02-11	Common Stock	F	1592	$86.43	Disposed	24983	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2026-02-10	Restricted Stock Units	$	A	800	Acquired		Common Stock (800)	Direct

Holdings (Derivative)

Security	Exercise Price	Expiration	Underlying	Shares	Ownership
Restricted Stock Units	$		Common Stock (200)	200	Direct
Restricted Stock Units	$		Common Stock (300)	300	Direct
Restricted Stock Units	$		Common Stock (525)	525	Direct

Footnotes

F1: Represents shares received upon the vesting of certain performance criteria in connection with a Performance Share Award (granted in 2023).

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 acquired individually through dividend reinvestment, Employee Stock Purchase Plan, and acquired pursuant to Restricted Stock Awards and Performance Share Awards

F4: Each restricted stock unit represents a contingent right to receive one share of Otter Tail Corporation stock.

F5: The restricted stock units vest in four equal annual installments beginning the date shown above.