Form 4 for OTTR Otter Tail Corp

Accepted 2026-02-12 00:00:00 ET · period of report 2026-02-10 · accession 0001559334-26-000004 · SEC index · Original document

Summary rows

Aggregated the way they appear in lists: one row per insider, transaction code and security table.

X	Filed	Traded	Ticker	Insider	Title	Type	Price	Qty	Owned	ΔOwn	Value
D	2026-02-12	2026-02-11	OTTR	KNUTSON PAUL L	VP, Human Resources	A - Grant	$86.43	+3,600	26.6K	+16%	+$311.1K
D	2026-02-12	2026-02-11	OTTR	KNUTSON PAUL L	VP, Human Resources	F - Tax	$86.43	-1,592	25.0K	-6%	-$137.6K
D	2026-02-12	2026-02-10	OTTR	KNUTSON PAUL L	VP, Human Resources	A - Grant	$0.00	+800	800	New	$0

Purchase Sale Sale after option exercise All abbreviations

#	Table	Security	Date	Code	A/D	Shares	Price	Owned after	Own	Exercise / expiry	Underlying	Footnotes
1	Common	Common Stock	2026-02-11	A	A	3,600	$86.43	26,575	D	—	—	(F1) Represents shares received upon the vesting of certain performance criteria in connection with a Performance Share Award (granted in 2023).
2	Common	Common Stock	2026-02-11	F	D	1,592	$86.43	24,983	D	—	—	(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
3	Derivative	Restricted Stock Units	2026-02-10	A	A	800	$0.00	800	D	— · 2027-02-06 to —	800 Common Stock	(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.