X0306 4 2021-08-10 0 0000889331 LITTELFUSE INC /DE LFUS 0001766692 Conrad Alexander C/O LITTELFUSE, INC. 8755 W HIGGINS ROAD, SUITE 500 CHICAGO IL 60631 0 1 0 0 SVP &GM Passenger Vehicle Common Stock 2021-08-10 4 M 0 683 192.59 A 5348 D Common Stock 2021-08-10 4 M 0 1468 199.24 A 6816 D Common Stock 2021-08-10 4 M 0 1749 132.08 A 8565 D Common Stock 2021-08-10 4 S 0 5600 269.12 D 2965 D Stock Option (right to buy) 192.59 2021-08-10 4 M 0 683 0 D 2025-04-27 Common Stock 683 0 D Stock Option (right to buy) 199.24 2021-08-10 4 M 0 1468 0 D 2026-04-26 Common Stock 1468 800 D Stock Option (right to buy) 132.08 2021-08-10 4 M 0 1749 0 D 2027-04-23 Common Stock 1749 3604 D The shares were sold in multiple transactions at prices ranging from $269.00 to $269.31, inclusive. This amount represents the weighted average sale price of such transactions. The reporting person undertakes to provide full information regarding the number of shares sold at each separate price upon request of the Securities and Exchange Commission, the Issuer, or a security holder of the Issuer. The option for 2,050 shares vested in increments of one third annually beginning on the first anniversary of the April 27, 2018 date of grant. The option for 2,401 shares vested in increments of one third annually beginning on the first anniversary of the April 26, 2019 date of grant. The option for 5,353 shares vested in increments of one third annually beginning on the first anniversary of the April 23, 2020 date of grant. Hans Weinburger, by power of attorney 2021-08-12