X0306 4 2021-08-27 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 2021-08-27 4 M 0 10000 1.90 A 161028 D Common Stock 2021-08-27 4 S 0 10000 18.06 D 151028 D Common Stock 2021-08-30 4 M 0 5000 1.90 A 156028 D Common Stock 2021-08-30 4 S 0 5000 18.26 D 151028 D Common Stock 707949 I As co-trustee of Nancy Koss Trust Common Stock 119148 I ESOP Common Stock 1000885 I As co-trustee of Koss Family Trust Stock Option (right to buy) 1.90 2021-08-27 4 M 0 10000 0.00 D 2025-07-22 Common Stock 10000 90000 D Stock Option (right to buy) 1.90 2021-08-30 4 M 0 5000 0.00 D 2025-07-22 Common Stock 5000 85000 D The price reported in column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $18.00 to $18.15, inclusive. The reporting person undertakes to provide to the issuer, any security holder of the issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote. The price reported in column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $18.25 to $18.28, inclusive. The reporting person undertakes to provide to the issuer, any security holder of the issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote. 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. These Stock Options vest in four equal annual installments beginning on July 22, 2021. /s/ David D. Smith, as attorney-in-fact 2021-08-31