X0306 4 2021-06-01 0 0000056701 KOSS CORP KOSS 0001217521 KOSS JOHN C JR C/O KOSS CORPORATION 4129 N. PORT WASHINGTON AVE. MILWAUKEE WI 53212 0 1 1 0 Vice President - Sales Common Stock 2021-06-01 4 S 0 5000 25.00 D 197161 D Common Stock 2021-06-02 4 S 0 5000 28.00 D 192161 D Common Stock 2021-06-03 4 S 0 5000 31.35 D 187161 D Common Stock 2021-06-03 4 S 0 5000 30.00 D 182161 D Common Stock 2021-06-03 4 S 0 5000 32.50 D 177161 D Common Stock 2021-06-03 4 S 0 5000 35.36 D 172161 D Common Stock 707949 I As co-trustee of Nancy Koss Trust Common Stock 119392 I ESOP Common Stock 1000885 I As co-trustee of Koss Family Trust The reporting person and members of his immediate family are the sole beneficiaries of the trust. The reporting person disclaims beneficial ownership of these securities except to the extent of his pecuniary interest therein. /s/ David D. Smith, as attorney-in-fact 2021-06-03