X0306 4 2021-02-01 0 0000056701 KOSS CORP KOSS 0001190293 KOSS MICHAEL J C/O KOSS CORPORATION 4129 N. PORT WASHINGTON AVE. MILWAUKEE WI 53212 1 1 1 0 President and CEO Common Stock 2021-02-01 4 M 0 160000 2.42 A 1023907 D Common Stock 2021-02-01 4 S 0 30000 46.12 D 993907 D Common Stock 2021-02-01 4 S 0 10000 41.55 D 983907 D Common Stock 2021-02-01 4 S 0 86000 39.61 D 897907 D Common Stock 2021-02-01 4 S 0 39000 39.02 D 858907 D Common Stock 2021-02-01 4 S 0 25000 37.56 D 833907 D Common Stock 2021-02-01 4 S 0 25000 48.26 D 832949 I As co-trustee of Nancy Koss Trust Common Stock 2021-02-01 4 S 0 5000 44.00 D 827949 I As co-trustee of Nancy Koss Trust Common Stock 2021-02-01 4 S 0 20000 41.81 D 807949 I As co-trustee of Nancy Koss Trust Common Stock 2021-02-01 4 S 0 20000 35.01 D 787949 I As co-trustee of Nancy Koss Trust Common Stock 2021-02-01 4 S 0 34000 60.00 D 81122 I As co-trustee of trusts for children Common Stock 2021-02-02 4 S 0 30000 19.84 D 757949 I As co-trustee of Nancy Koss Trust Common Stock 1000885 I As co-trustee of Koss Family Trust Common Stock 158091 I ESOP Common Stock 983800 I By family corporation Stock Option (Right to Buy) 2.42 2021-02-01 4 M 0 160000 0.00 D 2021-07-27 Common Stock 160000 0 D The price reported in column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $39.15 to $40.15, 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 $39.01 to $39.05, 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 $37.50 to $37.65, 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. The price reported in column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $41.50 to $42.11, 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. These shares are held through three separate trusts. Each trust benefits an adult child of the reporting person. The reporting person disclaims beneficial ownership of these securities except to the extent of his pecuniary interest therein. The reporting person disclaims beneficial ownership of these securities except to the extent of his pecuniary interest therein. This option vests in four equal annual installments beginning on July 27, 2017. /s/ David D. Smith, as attorney-in-fact 2021-02-03