X0306 4 2021-02-01 1 0000056701 KOSS CORP KOSS 0001584788 Nancy Koss 2012 Trust, Dated 12/20/12 C/O KOSS CORPORATION 4129 N. PORT WASHINGTON AVE. MILWAUKEE WI 53212 0 0 1 0 Common Stock 2021-02-01 4 S 0 25000 48.26 D 832949 D Common Stock 2021-02-01 4 S 0 5000 44.00 D 827949 D Common Stock 2021-02-01 4 S 0 20000 41.81 D 807949 D Common Stock 2021-02-01 4 S 0 20000 35.01 D 787949 D Common Stock 2021-02-02 4 S 0 30000 19.84 D 757949 D The price reported in column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $42.11 to $41.50, 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. /s/ Michael J. Koss, as trustee 2021-02-05