X0206 3/A 2021-12-30 2021-12-30 0 0000351789 ELECTRO SENSORS INC ELSE 0001832739 Peterson Patricia Nancy 6005 ERIN TERRACE EDINA MN 55439 1 Common Stock 364768 D Includes 350,893 shares acquired by operation of law from the Estate of Nancy P. Peterson. /s/ Patricia N. Peterson 2021-12-30