Innovative Solutions and Support (ISSC) DEFA14A Additional proxy soliciting materials

UNITED STATES
SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 14A

Proxy Statement Pursuant to Section 14(a) of
the Securities Exchange Act of 1934 (Amendment No.     )

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Filed by a Party other than the Registrant  o
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o	Preliminary Proxy Statement
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o	Definitive Proxy Statement
x	Definitive Additional Materials
o	Soliciting Material under §240.14a-12
INNOVATIVE SOLUTIONS AND SUPPORT, INC.
(Name of Registrant as Specified In Its Charter)
(Name of Person(s) Filing Proxy Statement, if other than the Registrant)
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*** Exercise Your Right to Vote *** Important Notice Regarding the Availability of Proxy Materials for the Shareholder Meeting to Be Held on April 16, 2020. INNOVATIVE SOLUTIONS AND SUPPORT, INC. You are receiving this communication because you hold shares in the company named above. This is not a ballot. You cannot use this notice to vote these shares. This communication presents only an overview of BROADRIDGE CORPORATE ISSUER SOLUTIONS C/O INNOVATIVE SOLUTIONS AND SUPPORT, INC. P.O. BOX 1342 BRENTWOOD, NY 11717 the more complete proxy materials that are available to you on the Internet. You may view the proxy materials online at www.proxyvote.com or easily request a paper copy (see reverse side). We encourage you to access and review all of the important information contained in the proxy materials before voting. proxy materials and voting instructions. E89441-P32938 See the reverse side of this notice to obtain Meeting Information Meeting Type:Annual Meeting For holders as of:February 18, 2020 Date: April 16, 2020Time: 10:00 a.m. local time Location: 720 Pennsylvania Drive Exton, Pennsylvania 19341

Before You Vote How to Access the Proxy Materials How To Vote Please Choose One of the Following Voting Methods E89442-P32938 Vote In Person: Many shareholder meetings have attendance requirements including, but not limited to, the possession of an attendance ticket issued by the entity holding the meeting. Please check the meeting materials for any special requirements for meeting attendance. At the meeting, you will need to request a ballot to vote these shares. Vote By Internet: To vote now by Internet, go to www.proxyvote.com. Have the information that is printed in the box marked by the arrow (located on the following page) available and follow the instructions. Vote By Mail: You can vote by mail by requesting a paper copy of the materials, which will include a proxy card. XXXX XXXX XXXX XXXX Proxy Materials Available to VIEW or RECEIVE: NOTICE AND PROXY STATEMENTFORM 10-K How to View Online: Have the information that is printed in the box marked by the arrow(located on the following page) and visit: www.proxyvote .com. How to Request and Receive a PAPER or E-MAIL Copy: If you want to receive a paper or e-mail copy of these documents, you must request one. There is NO charge for requesting a copy. Please choose one of the following methods to make your request: 1) BY INTERNET:www.proxyvote.com 2) BY TELEPHONE: 1-800-579-1639 3) BY E-MAIL*:sendmaterial@proxyvote.com * If requesting materials by e-mail, please send a blank e-mail with the information that is printed in the box marked by the arrow(located on the following page) in the subject line. Requests, instructions and other inquiries sent to this e-mail address will NOT be forwarded to your investment advisor. Please make the request as instructed above on or before April 2, 2020 to facilitate timely delivery. XXXX XXXX XXXX XXXX XXXX XXXX XXXX XXXX

Voting Items The Board of Directors recommends you vote FOR the following proposals: 1. Election of each of Messrs. Geoffrey S. M. Hedrick, Winston J. Churchill, Roger A. Carolin, Robert E. Mittelstaedt, Jr. and Glen R. Bressner as directors of the Company for a term of one year. 2. Advisory vote on named executive officer compensation as disclosed in the Proxy Statement. 3. Ratification of the appointment of Grant Thornton LLP as the Company's independent registered public accounting firm for the fiscal year ended September 30, 2020. 1a. Geoffrey S. M. Hedrick 1b. Winston J. Churchill 1c. Roger A. Carolin 1d. Robert E. Mittelstaedt, Jr. 1e. Glen R. Bressner E89443-P32938

E89444-P32938