and shall not be deemed to be “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “ Exchange Act ”), or otherwise subject to the liabilities of that section, nor shall it be deemed to be incorporated by reference in any filing under the Securities Act of 1933, as amended, or the Exchange Act, except as shall be expressly provided by specific reference in such filing.

Entry into a Material Definitive Agreement. On July 21, 2026, Innovative Solutions and Support, Inc., a Pennsylvania corporation (the “Company”), entered into a Membership Interest Purchase Agreement (the “Purchase Agreement”) with Sparton Corporation, a Delaware corporation (“Seller”), pursuant to which the Company acquired all of the issued and outstanding membership interests (the “Membership Interests”) of Sparton Aydin, LLC, a Delaware limited liability company doing business as Aydin Di…

(d) Exhibits. Exhibit No. Description 2.1*+ Membership Interest Purchase Agreement, dated as of July 21, 2026, by and between Sparton Corporation and Innovative Solutions and Support, Inc. 99.1 Press Release, dated July 21, 2026. 104 Cover Page Interactive Data File – the cover page XBRL tags are embedded within the inline XBRL document. * Schedules and exhibits have been omitted pursuant to Item 601(a)(5) of Regulation S-K. The Company will furnish supplementally a copy of any omitted schedu…

Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant. The information set forth in

Results of Operations and Financial Condition. On May 14, 2026, Innovative Solutions and Support, Inc. dba Innovative Aerosystems and its subsidiaries issued a press release announcing its financial results for its fiscal second quarter ended March 31, 2026. A copy of that press release is attached as Exhibit 99.1 to this report and incorporated herein by reference. The information in this report (including Exhibit 99.1) is being furnished pursuant to

Entry into a Material Definitive Agreement. Autopilot Asset Purchase and License Agreement On March 27, 2026, Innovative Solutions and Support, Inc. (the “ Company ”) entered into and closed the transactions contemplated by that certain Asset Purchase and License Agreement (the “ Autopilot Agreement ”) with Honeywell International Inc. (“ Honeywell ”). Pursuant to the Autopilot Agreement, Honeywell sold, assigned or licensed certain assets related to its general aviation autopilots and nav/co…

Completion of Acquisition or Disposition of Assets. The information set forth in

Results of Operations and Financial Condition. On February 12, 2026, Innovative Solutions and Support, Inc. dba Innovative Aerosystems and its subsidiaries issued a press release announcing its financial results for its fiscal first quarter for the three-month period ended December 31, 2025. A copy of that press release is attached as Exhibit 99.1 to this report and incorporated herein by reference. The information in this report (including Exhibit 99.1) is being furnished pursuant to

Results of Operations and Financial Condition. On December 18, 2025, Innovative Solutions and Support, Inc. dba Innovative Aerosystems and its subsidiaries issued a press release announcing its financial results for its fiscal fourth quarter and fiscal 2025 year ended September 30, 2025. A copy of that press release is attached as Exhibit 99.1 to this report and incorporated herein by reference. The information in this report (including Exhibit 99.1) is being furnished pursuant to

Director — Richard Silfen: The company appointed Richard Silfen as an independent director to expand the board.

Results of Operations and Financial Condition. On August 14, 2025, Innovative Solutions and Support, Inc. issued a press release announcing its financial results for its fiscal third quarter ended June 30, 2025. A copy of that press release is attached as Exhibit 99.1 to this report and incorporated herein by reference. The information in this report (including Exhibit 99.1) is being furnished pursuant to

Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant. ​ The information set forth under

Entry into a Material Definitive Agreement. ​ On July 18, 2025, Innovative Solutions and Support, Inc. (the “Company”), its wholly-owned subsidiary Innovative Solutions and Support, LLC (“Borrower”) and certain domestic subsidiaries entered into a Credit Agreement (the “Credit Agreement”) with JPMorgan Chase Bank, N.A. (the “Bank”) and the other lender parties thereto, which Credit Agreement provides for the Bank to extend to the Borrower credit facilities in an aggregate principal amount of…

Other Events ​ On July 22, 2025, the Company issued a press release announcing the entry into the Credit Agreement. ​

Results of Operations and Financial Condition. On May 14, 2025, Innovative Solutions and Support, Inc. issued a press release announcing its financial results for its fiscal second quarter ended March 31, 2025. A copy of that press release is attached as Exhibit 99.1 to this report and incorporated herein by reference. The information in this report (including Exhibit 99.1) is being furnished pursuant to

and shall not be deemed to be “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liabilities of that section, nor shall it be deemed to be incorporated by reference in any filing under the Securities Act of 1933, as amended, or the Exchange Act, except as shall be expressly provided by specific reference in such filing.

Director — Denise Devine: Ms. Denise Devine was appointed as an independent director and joined the Audit Committee.

Results of Operations and Financial Condition. On December 19, 2024, Innovative Solutions and Support, Inc. issued a press release announcing its financial results for the three and twelve-months ended September 30, 2024. A copy of the press release is attached hereto as Exhibit 99.1 and incorporated herein by reference. The information in this report (including Exhibit 99.1) is being furnished pursuant to

Shahram Askarpour: The filing describes a grant of performance stock units to the CEO, which is a compensatory arrangement and not a management change.

Shahram Askarpour: The filing describes a compensatory arrangement for the CEO, not a management change.

(d) Exhibits. Exhibit No. Description 2.1*+ Asset Purchase and License Agreement, dated September 27, 2024, by and between Innovative Solutions and Support, Inc., and Honeywell International Inc. 10.1* Amendment to Loan Documents, dated September 30, 2024, by and among Innovative Solutions and Support, Inc., Innovative Solutions and Support, LLC, and PNC Bank, National Association 10.2* Amended and Restated Revolving Line of Credit Note, dated September 30, 2024, by and among Innovative Solut…

Entry into a Material Definitive Agreement. Asset Purchase and License Agreement On September 27, 2024, Innovative Solutions and Support, Inc. (the “ Company ”) entered into and closed the transactions contemplated by that certain Asset Purchase and License Agreement (the “ Agreement ”) with Honeywell International Inc. (“ Honeywell ”). Pursuant to the Agreement, Honeywell sold, assigned or licensed certain assets related to its various generations of military display generators and flight co…

Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registration. The information set forth in

Chief Executive Officer — Shahram Askarpour: Amendment to employment agreement with the CEO, updating severance provisions.

Entry into a Material Definitive Agreement. On September 6, 2024, the Board of Directors (the “ Board ”) of Innovative Solutions and Support, Inc. (the “ Company ”) approved an amendment (the “ Amendment ”) to the Rights Agreement (the “ Ri g hts A g reement ”), dated as of September 12, 2022, between the Company and Broadridge Corporate Issuer Solutions, Inc., as Rights Agent, to extend the Final Expiration Date, as defined in the Rights Agreement, to the close of business on September 10, 2…