Otter Tail VP reports sales of 725 indirect shares

Otter Tail Corp VP, Human Resources Paul L. Knutson reported indirect sales of Otter Tail common stock held for his children.

Rhea-AI Filing Summary

Otter Tail Corp VP, Human Resources Paul L. Knutson reported indirect sales of Otter Tail common stock held for his children. On 2026-08-10, 250 shares held "By son" were sold at $92.84 per share, and on 2026-08-11, 475 shares held "By daughter" were sold at $94.63 per share, each in a single transaction. After these sales, the Form 4 shows 0 indirect shares remaining in each of those accounts, while direct holdings total 20,770 shares, including shares acquired through dividend reinvestment, an Employee Stock Purchase Plan, Restricted Stock Awards, and Performance Share Awards.

Insider Trade Summary

Net Seller: 725 shares

Net Sell 3 txns

Insider KNUTSON PAUL L

Role VP, Human Resources

Sold 725 shs ($68K)

Type	Security	Shares	Price	Value
Sale	Common Stock F3	475	$94.63	$45K
Sale	Common Stock F2	250	$92.84	$23K
holding	Common Stock F1	--	--	--

Holdings After Transaction: Common Stock — 0 shares (Indirect, By son); Common Stock — 0 shares (Indirect, By daughter); Common Stock — 20,770 shares (Direct)

Footnotes (3)

1. F1. 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.
2. F2. The shares were sold in a single transaction at a price of $92.84 per share.
3. F3. The shares were sold in a single transaction at a price of $94.63 per share.

Key Figures

Shares sold (son account): 250 shares at $92.84 per share Shares sold (daughter account): 475 shares at $94.63 per share Total shares sold: 725 shares +1 more

4 metrics

Shares sold (son account) 250 shares at $92.84 per share Indirect holding "By son" sold on 2026-08-10 in a single transaction

Shares sold (daughter account) 475 shares at $94.63 per share Indirect holding "By daughter" sold on 2026-08-11 in a single transaction

Total shares sold 725 shares Two indirect sales of common stock reported for August 2026

Direct holdings after transactions 20,770 shares Direct Otter Tail common stock held after reported August 2026 sales

Key Terms

Employee Stock Purchase Plan, Restricted Stock Awards, Performance Share Awards, indirect

4 terms

Employee Stock Purchase Plan financial

"include shares acquired individually through dividend reinvestment, Employee Stock Purchase Plan, and acquired"

An employee stock purchase plan is a company program that lets workers buy shares through small payroll deductions, often at a discount to the market price and after a set offering period. Think of it like a workplace savings plan that turns into ownership: it encourages employees to share in the company’s success and can create predictable buying or selling of stock that investors watch because it affects supply, demand and employee incentives.

Restricted Stock Awards financial

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

Restricted stock awards are company shares given to employees or executives that cannot be sold or transferred until certain conditions — like staying with the company for a set time or meeting performance targets — are met, like a gift that is locked in a safe until rules are satisfied. Investors care because these awards tie management’s pay to company performance, can increase the number of shares outstanding when they become tradable (dilution), and may signal expected future selling pressure or commitment to long-term growth.

Performance Share Awards financial

"Employee Stock Purchase Plan, and acquired pursuant to Restricted Stock Awards and Performance Share Awards."

Performance share awards are grants of company stock that executives or employees receive only if the business reaches specific financial or operational goals over a set period. They matter to investors because they align management’s pay with company performance—like a bonus that pays in shares only when targets are hit—so successful outcomes can boost future earnings and share value while failures mean the awards are forfeited.

indirect financial

"The reported sales involve indirect holdings described as "By son" and "By daughter.""

FAQ

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

What insider transactions did Otter Tail Corp (OTTR) report for Paul L. Knutson?

Paul L. Knutson reported two indirect sales of Otter Tail common stock held for his children, totaling 725 shares over two days in August 2026 at prices above $92 per share.

How many Otter Tail Corp (OTTR) shares were sold from the son’s account?

On 2026-08-10, 250 shares of Otter Tail common stock held "By son" were sold in a single transaction at $92.84 per share, leaving 0 shares reported remaining in that indirect account.

How many Otter Tail Corp (OTTR) shares were sold from the daughter’s account?

On 2026-08-11, 475 shares of Otter Tail common stock held "By daughter" were sold in a single transaction at $94.63 per share, with the filing showing 0 indirect shares remaining in that account afterward.

What are Paul L. Knutson’s direct holdings in Otter Tail Corp (OTTR) after these transactions?

After the reported transactions, Paul L. Knutson’s direct holdings are 20,770 shares of Otter Tail common stock, including shares from dividend reinvestment, an Employee Stock Purchase Plan, Restricted Stock Awards, and Performance Share Awards.

Are the reported Otter Tail Corp (OTTR) sales by Paul L. Knutson direct or indirect holdings?

The reported sales involve indirect holdings described as "By son" and "By daughter." The Form 4 shows these children’s accounts at 0 shares post-sale, while Knutson maintains direct holdings of 20,770 shares.

Were the Otter Tail Corp (OTTR) insider sales made under a Rule 10b5-1 trading plan?

The filing’s Rule 10b5-1 checkbox is not marked as affirming a trading plan (aff_10b5_one is false), and the footnotes do not state that these transactions were made under a Rule 10b5-1 plan.

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

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Available on EDGAR 08/12/2026 - 11:24 AM Accepted by SEC EDGAR 08/12/2026 - 11:24 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 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)

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

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
08/10/2026

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								20,770(1)	D
Common Stock	08/10/2026		S		250	D	$92.84(2)	0	I	By son
Common Stock	08/11/2026		S		475	D	$94.63(3)	0	I	By daughter

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. 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.

2. The shares were sold in a single transaction at a price of $92.84 per share.

3. The shares were sold in a single transaction at a price of $94.63 per share.

Remarks:

	/s/ Paul L. Knutson by James A. Versteeg, Attorney-in-Fact	08/12/2026
	** 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.
* Form 4: SEC 1474 (03-26)