X0306 4 2021-02-25 0 0000836690 INNOVATIVE SOLUTIONS & SUPPORT INC ISSC 0001200847 MITTELSTAEDT ROBERT E JR 720 PENNSYLVANIA DRIVE EXTON PA 19341 1 0 0 0 Common Stock 2021-02-25 4 S 0 10000 6.54 D 199683 D The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $6.50 to $6.58, inclusive. The reporting person undertakes to provide to Innovative Solutions & Support Inc. ("ISSC"), any security holder of ISSC 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. Relland M. Winand, Attorney in fact for Robert E. Mittelstaedt, Jr. 2021-02-26