Sec Form 3 Filing - AI Alpine (Luxembourg) S.a.r.l. @ INNIO N.V. - 2026-06-04

FORM 3 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person AI Alpine (Luxembourg) S.a.r.l. 2. Issuer Name and Ticker or Trading Symbol INNIO N.V. [ INIO] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director X __ 10% Owner _____ Officer (give title below) _____ Other (specify below) (Last) (First) (Middle) 2-4 RUE BECK, 3. Date of Earliest Transaction (MM/DD/YY) 06/04/2026 (Street) LUXEMBOURG, MAL-1222 4. If Amendment, Date Original Filed (MM/DD/YY) 6. Individual or Joint/Group Filing (Check Applicable Line) _____ Form filed by One Reporting Person __ X __ Form filed by More than One Reporting Person (City) (State) (Zip)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned 1.Title of Security (Instr. 3) 2. Transaction Date (MM/DD/YY) 2A. Deemed Execution Date, if any (MM/DD/YY) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price Common Shares 750,000,000 D ( 1 ) ( 2 ) ( 3 )

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities) 1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (MM/DD/YY) 3A. Deemed Execution Date, if any (MM/DD/YY) 4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4, and 5) 6. Date Exercisable and Expiration Date (MM/DD/YY) 7. Title and Amount of Underlying Securities (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4) Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other AI Alpine (Luxembourg) S.a.r.l. 2-4 RUE BECK LUXEMBOURGL-1222 X AI Alpine Parent & Cy S.C.A. 2-4 RUE BECK LUXEMBOURGL-1222 X ADVENT INTERNATIONAL, L.P. PRUDENTIAL TOWER 800 BOYLSTON STREET, SUITE 3300 BOSTON, MA02199-8069 X ADVENT INTERNATIONAL GP, LLC PRUDENTIAL TOWER 800 BOYLSTON STREET, SUITE 3300 BOSTON, MA02199-8069 X Abu Dhabi Investment Authority 211 CORNICHE STREET PO BOX 3600 ABU DHABI X Signatures AI ALPINE (LUXEMBOURG) S.A R.L., By: /s/ Jean-Francois Jochum, Name: Jean-Francois Jochum, Title: Authorized Signatory, By: /s/ Yves Kuhn, Name: Yves Kuhn, Title: Authorized Signatory 06/04/2026 Signature of Reporting Person Date AI ALPINE PARENT & CY S.C.A., By: AI Alpine GP S.a r.l., its General Partner, By: /s/ Jean-Francois Jochum, Name: Jean-Francois Jochum, Title: Manager, By: /s/ Kremena Popova, Name: Kremena Popova, Title: Manager 06/04/2026 Signature of Reporting Person Date ADVENT INTERNATIONAL, L.P., By: Advent International GP, LLC, its General Partner, By: /s/ Neil Crawford, Name: Neil Crawford, Title: Vice President of Finance 06/04/2026 Signature of Reporting Person Date ADVENT INTERNATIONAL GP, LLC, By: /s/ Neil Crawford, Name: Neil Crawford, Title: Vice President of Finance 06/04/2026 Signature of Reporting Person Date ABU DHABI INVESTMENT AUTHORITY, By: /s/ Ahmed AlNeyadi, Name: Ahmed AlNeyadi, Title: Authorized Signatory, By: /s/ Saif Surour AlMashghouni, Name: Saif Surour AlMashghouni, Title: Authorized Signatory 06/04/2026 Signature of Reporting Person Date

Explanation of Responses:

( 1 )The reported securities are directly held by AI Alpine (Luxembourg) S.a r.l. (the "Shareholder"), which is indirectly controlled by AI Alpine Parent & Cy S.C.A. ("AI Alpine Parent"). Various funds and accounts affiliated with Advent International, L.P. and its general partner, Advent International GP, LLC (together with Advent International, L.P., "Advent"), indirectly hold 53.8% of the equity of AI Alpine Parent and, accordingly, Advent exercises voting and investment control of the securities directly held by the Shareholder. The board of Advent International GP, LLC appoints the investment committee of Advent International, L.P. (the "Investment Committee"), which Investment Committee has voting and investment power with respect to the securities directly held by the Shareholder. ( 2 )Abu Dhabi Investment Authority ("ADIA") indirectly holds approximately 45.0% of the equity of AI Alpine Parent through Luxinva S.A., a wholly owned subsidiary of ADIA. Due to the terms of its relationship with AI Alpine Parent and such indirect holdings, ADIA may, for the purposes of and pursuant to the rules and regulations of the SEC, also be deemed to have beneficial ownership of the securities directly held by the Shareholder. ADIA is a public institution established by the Government of the Emirate of Abu Dhabi. ( 3 )Each Reporting Person and each other person referenced in this Statement disclaims Section 16 beneficial ownership of the reported securities except to the extent of their respective pecuniary interest therein, if any, and this Statement shall not be deemed an admission of beneficial ownership of any of the reported shares for purposes of Section 16 or any other purpose.

Remarks: The board of directors of the Issuer (the "Board") currently includes members affiliated with certain of the Reporting Persons that were appointed or elected to the Board pursuant to the Relationship Agreement, dated June 4, 2026, between the Issuer and the Shareholder. As a result, the Reporting Persons may be deemed directors by deputization for purposes of Section 16 of the Exchange Act.

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.

* If the form is filed by more than one reporting person, see Instruction 4(b)(v).

** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).

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