[Form 4] Otter Tail Corp Insider Trading Activity

Otter Tail Corp VP of Human Resources Paul L. Knutson reported equity awards and related tax withholding.

Rhea-AI Filing Summary

Otter Tail Corp VP of Human Resources Paul L. Knutson reported equity awards and related tax withholding. He acquired 3,600 shares of common stock at $86.43 per share upon vesting of a 2023 performance share award, with 1,592 shares withheld to cover taxes. After these transactions, he directly owns 24,983 common shares. Knutson also received a grant of 800 restricted stock units, each representing one share, which vest in four equal annual installments beginning on the stated vesting dates.

Insider Trade Summary

6 transactions reported

Mixed 6 txns

Insider KNUTSON PAUL L

Role VP, Human Resources

Type	Security	Shares	Price	Value
Grant/Award	Common Stock	3,600	$86.43	$311K
Exercise Price or Tax Liability	Common Stock	1,592	$86.43	$138K
Grant/Award	Restricted Stock Units	800	$0.00	$0.00
holding	Restricted Stock Units	--	--	--
holding	Restricted Stock Units	--	--	--
holding	Restricted Stock Units	--	--	--

Holdings After Transaction: Restricted Stock Units — 1,825 contracts for 1,025 underlying shares (Direct); Common Stock — 24,983 shares (Direct)

Footnotes (5)

1. F1. Represents shares received upon the vesting of certain performance criteria in connection with a Performance Share Award (granted in 2023).
2. F2. These shares were withheld by the Corporation to pay taxes due upon vesting of this award, exempt pursuant to Rule 16b-3(e).
3. 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
4. F4. Each restricted stock unit represents a contingent right to receive one share of Otter Tail Corporation stock.
5. F5. The restricted stock units vest in four equal annual installments beginning the date shown above.

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Accepted by SEC EDGAR 02/12/2026 - 09:42 AM Learn about SEC filing dates

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

KNUTSON PAUL L

(Last) (First) (Middle)

215 SOUTH CASCADE STREET

(Street)

FERGUS FALLS MN 56537

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
Otter Tail Corp [ OTTR ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	VP, Human Resources

3. Date of Earliest Transaction (Month/Day/Year)
02/10/2026

4. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock	02/11/2026		A		3,600(1)	A	$86.43	26,575	D
Common Stock	02/11/2026		F		1,592(2)	D	$86.43	24,983(3)	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Restricted Stock Units	(4)	02/10/2026		A		800		02/06/2027(5)	(5)	Common Stock	800	$0	800	D
Restricted Stock Units	(4)							02/06/2024(5)	(5)	Common Stock	200		200	D
Restricted Stock Units	(4)							02/06/2025(5)	(5)	Common Stock	300		300	D
Restricted Stock Units	(4)							02/06/2026(5)	(5)	Common Stock	525		525	D

Explanation of Responses:

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

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

3. 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

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

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

Remarks:

	/s/ Paul L. Knutson by James A. Versteeg, Attorney-in-Fact	02/12/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.