TDG: Other company developments

Item 8.01. Other Events. On September 28, 2026, TransDigm Group Incorporated (“TransDigm Group”) issued a press release (the “Press Release”) announcing the completion of the acquisition of Prince & Izant (“P&I” or “the Company”), formerly a portfolio company of Industrial Growth Partners, for approximately $1.066 billion in cash, including certain tax benefits. TransDigm Group financed the acquisition of the Company through cash on hand. The entry into the definitive agreement to acquire P&I was previously reported in a Current Report on Form 8-K filed on July 27, 2026. A copy of this Press Release is attached to this Current Report on Form 8-K as Exhibit 99.1 and is incorporated herein by reference. Item 9.01. Financial Statements and Exhibits. (d) Exhibits Exhibit No. Description 99.1 Press Release 104 Cover Page Interactive Data File (embedded within the Inline XBRL document) 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 hereunto duly authorized. TRANSDIGM GROUP INCORPORATED By: /s/ Armani Vadiee Name: Armani Vadiee Title: General Counsel, Chief Compliance Officer and Secretary Dated: September 28, 2026