X0306 4 2021-02-25 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 2021-02-25 4 S 0 10000 30.13 D 256161 D Common Stock 2021-02-25 4 S 0 10000 23.51 D 747949 I As co-trustee of Nancy Koss Trust Common Stock 2021-02-25 4 S 0 40000 27.06 D 707949 I As co-trustee of Nancy Koss Trust Common Stock 2021-02-26 5 G 0 E 10000 0.00 D 246161 D Common Stock 119392 I ESOP Common Stock 1000885 I As co-trustee of Koss Family Trust The price reported in column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $30.02 to $30.62, 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 $23.50 to $23.67, 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 $26.50 to $27.50, 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. Reflects donation of directly owned shares to a donor-advised fund, which will use the gifted shares for charitable purposes. /s/ David D. Smith, as attorney-in-fact 2021-02-26