X0306 4 2019-04-08 0001466593 Otter Tail Corp OTTR 0001726153 Smestad Jennifer O. 215 S CASCADE ST FERGUS FALLS MN 56537-2801 1 VP, Gen Coun & Corp Sec Common Stock 2019-04-08 4 M 0 250 49.7307 A 635 D Common Stock 2019-04-08 4 F 0 89 49.7307 D 547 D Common Stock 428 I ESOP Common Stock 44 I by Daughter Restricted Stock Units 2019-04-08 4 M 0 250 0 D 2015-04-08 2019-04-08 Common Stock 250 0 D Restricted Stock Units 2016-04-13 Common Stock 300 300 D Restricted Stock Units 2017-04-10 Common Stock 225 225 D Restricted Stock Units 2019-02-06 Common Stock 900 900 D Restricted Stock Units 2020-02-06 Common Stock 1200 1200 D The reporting person receives one share of Common Stock for each restricted stock unit that vests. Total direct holdings include shares held jointly with spouse and acquired through the dividend reinvestment plan and the Employee Stock Purchase Plan. Each restricted stock unit represents a contingent right to receive one share of Otter Tail Corporation common stock. Restricted stock units vest four years from date shown above. The restricted stock units vest in four equal annual installments beginning the date shown above. /s/ Jennifer O. Smestad by Ella Leapaldt 2019-04-10