Otter Tail (OTTR) senior VP reports share vesting and tax withholding

Rhea-AI Filing Summary

Otter Tail Corporation senior vice president John S. Abbott reported equity award vesting and related share movements. On 02/06/2026, 1,625 shares of common stock were acquired following the vesting of restricted stock units, increasing direct holdings to 46,705 shares, plus 5,000 shares held indirectly by a trust.

The company withheld 763 shares at $87.83 to cover taxes due upon vesting, as noted in the footnotes. Several tranches of restricted stock units vested and were settled into common shares, with each unit representing the right to receive one Otter Tail share. Some RSU awards are now fully settled, while others continue as remaining balances.

Insider Trade Summary

1,625 shares exercised/converted

Mixed 7 txns

Insider Abbott John S

Role Sr VP, Manufacturing Platform

Type	Security	Shares	Price	Value
Exercise	Restricted Stock Units	400	$0.00	--
Exercise	Restricted Stock Units	450	$0.00	--
Exercise	Restricted Stock Units	350	$0.00	--
Exercise	Restricted Stock Units	425	$0.00	--
Exercise	Common Stock	1,625	$0.00	--
Tax Withholding	Common Stock	763	$87.83	$67K
holding	Common Stock	--	--	--

Holdings After Transaction: Restricted Stock Units — 0 shares (Direct); Common Stock — 47,468 shares (Direct); Common Stock — 5,000 shares (Indirect, By Trust)

Footnotes (1)

1. Each restricted stock unit represents a contingent right to receive one share of Otter Tail Corporation stock. These shares were withheld by the Corporation to pay taxes due upon vesting of this award, exempt pursuant to Rule 16b-3(e). Total direct holdings include shares acquired individually pursuant to Restricted Stock Awards and Performance Shares Awards. The restricted stock units vest in four equal annual installments beginning the date shown above.

Form 4 Insider Transactions: What Each Field Means →

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
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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^*

Abbott John S

(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)
	Sr VP, Manufacturing Platform

3. Date of Earliest Transaction (Month/Day/Year)
02/06/2026

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	02/06/2026		M		1,625	A	(1)	47,468	D
Common Stock	02/06/2026		F		763(2)	D	$87.83	46,705(3)	D
Common Stock								5,000	I	By Trust

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	(1)	02/06/2026		M			400	02/06/2023(4)	(4)	Common Stock	0	$0	0	D
Restricted Stock Units	(1)	02/06/2026		M			450	02/06/2024(4)	(4)	Common Stock	450	$0	450	D
Restricted Stock Units	(1)	02/06/2026		M			350	02/06/2025(4)	(4)	Common Stock	700	$0	700	D
Restricted Stock Units	(1)	02/06/2026		M			425	02/06/2026(4)	(4)	Common Stock	1,275	$0	1,275	D

Explanation of Responses:

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

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 pursuant to Restricted Stock Awards and Performance Shares Awards.

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

Remarks:

	/s/ John S. Abbott by James A Versteeg, Attorney-in-Fact	02/09/2026
	** 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.

FAQ

What did Otter Tail (OTTR) executive John S. Abbott report on this Form 4?

John S. Abbott reported vesting of restricted stock units and related share movements. He acquired 1,625 Otter Tail common shares and had 763 shares withheld to cover taxes, updating his direct and indirect ownership positions in the company’s stock.

How many Otter Tail (OTTR) shares does John S. Abbott own after the reported transactions?

After the transactions, John S. Abbott directly owns 46,705 Otter Tail common shares and indirectly holds 5,000 shares through a trust. These totals include shares acquired over time from restricted stock awards and performance share awards, as explained in the filing footnotes.

What is the purpose of the 763 Otter Tail (OTTR) shares reported with code F?

The 763 shares reported with transaction code F were withheld by Otter Tail to pay taxes due upon vesting of an equity award. This is a common administrative transaction and is described as exempt under Rule 16b-3(e) in the filing’s explanatory footnotes.

What do the restricted stock unit (RSU) transactions mean for Otter Tail (OTTR)?

The RSU transactions show equity compensation vesting for a senior executive. Each restricted stock unit represents a right to receive one Otter Tail share, vesting in four equal annual installments beginning on the dates listed, gradually converting awards into common stock ownership.

How are John S. Abbott’s indirect Otter Tail (OTTR) holdings structured?

In addition to his direct holdings, John S. Abbott has 5,000 Otter Tail shares reported as indirectly owned “By Trust.” This indicates the shares are held in a trust associated with him, while still being reported for Section 16 beneficial ownership purposes.

What does transaction code M indicate in the Otter Tail (OTTR) Form 4 filing?

Transaction code M indicates exercises or conversions of derivative securities, in this case restricted stock units converting into common stock. Several RSU grants vested on 02/06/2026, resulting in new common shares and updated remaining RSU balances for John S. Abbott.