INNOVATIVE SOLUTIONS & SUPPORT INC (0000836690) (Filer)

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, DC 20549

FORM 8-K/A

(Amendment No. 1)

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the

Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): July 21, 2026

INNOVATIVE SOLUTIONS AND SUPPORT, INC.

(Exact name of registrant as specified in its charter)

720 Pennsylvania Drive

Exton, Pennsylvania 19341

(Address of principal executive offices) (Zip Code)

(610) 646-9800

(Registrant’s telephone number, including area code)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

Securities registered pursuant to Section 12(b) of the Act:

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§ 230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§ 240.12b-2 of this chapter).

Emerging growth company ¨

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ¨

Item 2.01. Completion of Acquisitions or Dispositions of Assets.

On July 21, 2026, Innovative Solutions and Support, Inc. (the “Company”) filed a Current Report on Form 8-K reporting that on July 21, 2026, the Company entered into and closed the transactions contemplated by that certain Membership Interest Purchase Agreement (the “Purchase Agreement”) with Sparton Corporation, a Delaware corporation, pursuant to which the Company acquired all of the issued and outstanding membership interests of Sparton Aydin, LLC, a Delaware limited liability company doing business as Aydin Displays (“Aydin” or “Acquired Business”).

This Current Report on Form 8-K/A amends the original Form 8-K to provide the historical financial statements of the Acquired Business required under Item 9.01(a) of Form 8-K and the pro forma financial information required under Item 9.01(b) of Form 8-K. Except as set forth herein, this amendment does not amend, modify or update the disclosure contained in the original Form 8-K (including the exhibits thereto).

Item 9.01. Financial Statements and Exhibits.

The audited financial statements of the Acquired Business as of and for the year ended December 31, 2025 together with the Report of Independent Certified Public Accountant’s Report thereon, and the unaudited financial statements of the Acquired Business as of and for the six month period ended June 30, 2026, in each case with the accompanying notes, are filed as Exhibit 99.1 to this Current Report on Form 8-K/A and are incorporated herein by reference.

The unaudited pro forma condensed combined financial statements of the Company and the Acquired Business for the nine months ended June 30, 2026, and for the year ended September 30, 2025, are included as Exhibit 99.2 to this Current Report on Form 8-K/A and are incorporated by reference herein.

(d)   Exhibits.

SIGNATURE

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.