Otter Tail Corp — Director's Dealing 2025

Apr 14, 2025

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: Otter Tail Corp (OTTR)
CIK: 0001466593
Period of Report: 2025-04-13

Reporting Person: PARTAIN NATHAN I (Director)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2025-04-13	Common Stock	A	2200	—	Acquired	8741	Direct

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock	67561	Indirect
Common Stock	1600	Indirect

Footnotes

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, 2025 will vest in near-equal installments of one-third per
year beginning April 8, 2026.

F2: This grant has a fair market value of $77.59.

F3: Total direct holdings include shares acquired individually through the Dividend Reinvestment Plan and shares acquired individually pursuant to Restricted Stock Award distributions.