[Form 4] Otter Tail Corp Insider Trading Activity

Otter Tail Corp director Kathryn O. Johnson received a grant of 1,500 shares of Common Stock as restricted stock under the 2023 Stock Incentive Plan on April 13, 2026.

Rhea-AI Filing Summary

Otter Tail Corp director Kathryn O. Johnson received a grant of 1,500 shares of Common Stock as restricted stock under the 2023 Stock Incentive Plan on April 13, 2026. The grant will vest in near-equal installments of one-third per year beginning April 8, 2027. After this award, she directly holds 29,453 shares, reflecting compensation-based share acquisition rather than an open-market purchase.

Insider Trade Summary

Grant/Award: 1,500 shares

Grant/Award 1 txn

Insider Johnson Kathryn O

Role Director

Type	Security	Shares	Price	Value
Grant/Award	Common Stock	1,500	$0.00	$0.00

Holdings After Transaction: Common Stock — 29,453 shares (Direct)

Footnotes (3)

1. F1. Shares of Common Stock acquired under the 2023 Stock Incentive Plan, which is a grant of Restricted Stock. The shares granted on April 13, 2026 will vest in near-equal installments of one-third per year beginning April 8, 2027.
2. F2. This grant has a fair market value of $91.15.
3. F3. Total direct holdings include shares acquired individually and pursuant to Restricted Stock Award distributions.

Key Figures

Restricted stock grant: 1,500 shares Fair market value of grant: $91.15 Shares held after grant: 29,453 shares +1 more

4 metrics

Restricted stock grant 1,500 shares Common Stock grant on April 13, 2026

Fair market value of grant $91.15 Value stated for this restricted stock grant

Shares held after grant 29,453 shares Total direct holdings following the transaction

Vesting schedule start April 8, 2027 First vesting date; one-third per year

Key Terms

Restricted Stock, 2023 Stock Incentive Plan, fair market value, Restricted Stock Award distributions

4 terms

Restricted Stock financial

"which is a grant of Restricted Stock. The shares granted on April 13, 2026"

Shares granted to an individual that carry limits on transfer or sale until certain conditions are met, such as staying with the company for a set time or hitting performance targets. Think of them as a locked gift that gradually opens; for investors they matter because they affect how many shares may enter the market later, signal management incentives and potential dilution, and reveal confidence in future company performance.

2023 Stock Incentive Plan financial

"Shares of Common Stock acquired under the 2023 Stock Incentive Plan, which is a grant"

fair market value financial

"This grant has a fair market value of $91.15."

The price a willing buyer and a willing seller would agree on for an asset or security when neither is under pressure and both have access to the same information. Think of it as the market’s neutral estimate of what something is worth, like the price two neighbors would settle on for a car after comparing similar listings. Investors care because fair market value guides buying and selling decisions, tax reporting, portfolio valuation, and how accurately company assets are reflected in financial statements.

Restricted Stock Award distributions financial

"include shares acquired individually and pursuant to Restricted Stock Award distributions."

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What insider transaction did Otter Tail (OTTR) report for Kathryn O. Johnson?

Otter Tail reported that director Kathryn O. Johnson received a grant of 1,500 shares of Common Stock as restricted stock. The award was made under the 2023 Stock Incentive Plan and represents compensation, not an open-market share purchase or sale.

How many Otter Tail (OTTR) shares does Kathryn O. Johnson hold after this Form 4?

Following the grant, Kathryn O. Johnson directly holds 29,453 shares of Otter Tail Common Stock. This total includes shares acquired individually and through Restricted Stock Award distributions, as described in the filing’s footnotes.

How does the new restricted stock grant for Otter Tail (OTTR) vest?

The 1,500-share restricted stock grant vests in near-equal installments of one-third per year. Vesting begins on April 8, 2027, creating a three-year vesting schedule that ties continued service to full receipt of the awarded shares.

What plan governs the restricted stock grant reported for Otter Tail (OTTR)?

The grant was issued under Otter Tail’s 2023 Stock Incentive Plan. Footnotes specify that the 1,500 Common Stock shares were acquired as a Restricted Stock grant, consistent with the company’s long-term equity compensation framework for directors.

What is the stated fair market value of the Otter Tail (OTTR) grant?

The filing notes that this grant has a fair market value of $91.15. This value is provided in the footnotes and helps quantify the compensation element of the restricted stock award reported for director Kathryn O. Johnson.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Accepted by SEC EDGAR 04/14/2026 - 02:39 PM EDT 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^*

Johnson Kathryn O

(Last) (First) (Middle)

215 SOUTH CASCADE STREET

(Street)

FERGUS FALLS MINNESOTA 56537

(City) (State) (Zip)

UNITED STATES

(Country)

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

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

X	Director		10% Owner
	Officer (give title below)		Other (specify below)

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
04/13/2026

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

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

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

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	04/13/2026		A(1)		1,500	A	(2)	29,453(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

Explanation of Responses:

1. Shares of Common Stock acquired under the 2023 Stock Incentive Plan, which is a grant of Restricted Stock. The shares granted on April 13, 2026 will vest in near-equal installments of one-third per year beginning April 8, 2027.

2. This grant has a fair market value of $91.15.

3. Total direct holdings include shares acquired individually and pursuant to Restricted Stock Award distributions.

Remarks:

	/s/ Kathryn O. Johnson by James A. Versteeg, Attorney-in-Fact	04/14/2026
	** 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.
* Form 4: SEC 1474 (03-26)