X0306 4 2021-07-01 0 0000056701 KOSS CORP KOSS 0001484415 Smith David Donnan KOSS CORPORATION 4129 N. PORT WASHINGTON AVE. MILWAUKEE WI 53212 0 1 0 0 Chief Financial Officer Common Stock 2021-07-01 4 M 0 50000 6.00 A 50000 D Common Stock 2021-07-01 4 S 0 42500 22.05 D 7500 D Common Stock 2021-07-01 4 S 0 7500 23.00 D 0 D Common Stock 30 I ESOP Stock Option (Right to Buy) 6.00 2021-07-01 4 M 0 50000 0.00 D 2021-07-27 Common Stock 50000 0 D This sale was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on September 1, 2020. The price reported in column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $21.72 to $22.61, 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 $22.90 to $23.05, 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. This option vests in five equal annual installments beginning on July 27, 2012. /s/ David D. Smith 2021-07-02