X0306 4 2021-05-06 0 0000022701 COMMUNICATIONS SYSTEMS INC JCS 0001683065 Fandrich Mark 17400 6TH AVE. N. PLYMOUTH MN 55447 0 1 0 0 VP/CFO Common Stock 2021-05-06 4 A 0 4261 6.64 A 30972 D Common Stock 2021-05-06 4 F 0 1303 6.64 D 29669 D Common Stock 8140.6781 D Reflects all Employee Stock Purchase Plan issuances through May 6, 2021. Represents share withholding in connection with the vesting of 4,261 Restricted Stock Units. Reflects all ESOP allocations and dispositions that have occurred through May 6, 2021. Suzette McNally, Attorney-in-Fact for Mark Fandrich 2021-05-13