X0306 4 2021-02-19 0000102729 VALMONT INDUSTRIES INC VMI 0001185232 BAY MOGENS C ONE VALMONT PLAZA OMAHA NE 68154 true Common Stock 2021-02-19 4 M 0 42377 151.9 A 288221 D Common Stock 2021-02-19 4 F 0 33661 231.34 D 254560 D Common Stock 2021-02-19 4 S 0 25000 231.3 D 229560 D Common Stock 2021-02-22 4 S 0 15100 232.84 D 214560 D Non-Qualified Stock Option (right to buy) 151.9 2021-02-19 4 M 0 42377 0 D 2017-12-19 2023-12-19 Common Stock 42377 0 D The options vested in three equal installments beginning December 19, 2017. /s/ R. Andrew Massey for Mogens Bay 2021-02-23