X0202 SCHEDULE 13G 0001034196 XXXXXXXX LIVE Common shares, nominal value EUR 0.04 per share 06/30/2026 0002109150 INNIO N.V. N52A8C105 Nymphenburger Strasse 5, 80335 Munich 2M 00000 Rule 13d-1(d) Advent International, L.P. b DE 0.00 646500000.00 0.00 646500000.00 646500000.00 86.20 PN The reported percentage is calculated based on 750,000,000 common shares outstanding, as reported on the Issuer's prospectus pursuant to rule 424(b)(4) ("Prospectus") filed with the Securities and Exchange Commission ("SEC") on June 4, 2026. Advent International GP, LLC b DE 0.00 646500000.00 0.00 646500000.00 646500000.00 86.20 OO The reported percentage is calculated based on 750,000,000 common shares outstanding, as reported on the Issuer's Prospectus filed with the SEC on June 4, 2026. AI Alpine (Luxembourg) S.a.r.l. b N4 0.00 646500000.00 0.00 646500000.00 646500000.00 86.20 OO The reported percentage is calculated based on 750,000,000 common shares outstanding, as reported on the Issuer's Prospectus filed with the SEC on June 4, 2026. AI Alpine Parent & Cy S.C.A. b N4 0.00 646500000.00 0.00 646500000.00 646500000.00 86.20 OO The reported percentage is calculated based on 750,000,000 common shares outstanding, as reported on the Issuer's Prospectus filed with the SEC on June 4, 2026. Abu Dhabi Investment Authority b C0 0.00 646500000.00 0.00 646500000.00 646500000.00 86.20 OO The reported percentage is calculated based on 750,000,000 common shares outstanding, as reported on the Issuer's Prospectus filed with the SEC on June 4, 2026. INNIO N.V. Nymphenburger Strasse 5, 80335, Munich, Germany 00000 This statement is being jointly filed by each of the persons below pursuant to Rule 13d-1(k) promulgated by the SEC pursuant to Section 13 of the Act, all of whom together are referred to herein as the "Reporting Persons": (i) Advent International, L.P., a Delaware limited partnership ("Advent LP"); (ii) Advent International GP, LLC, a Delaware limited liability company ("Advent GP," and together with Advent LP, "Advent"); (iii) AI Alpine (Luxembourg) S.a.r.l., a private limited liability company (societe a responsabilite limitee) incorporated under the laws of the Grand Duchy of Luxembourg ("AI Alpine"); (iv) AI Alpine Parent & Cy S.C.A., a partnership limited by shares (societe en commandite par actions) incorporated under the laws of the Grand Duchy of Luxembourg ("AI Alpine Parent"); and (v) Abu Dhabi Investment Authority, a public institution established by the Government of the Emirate of Abu Dhabi in 1976 as an independent investment institution ("ADIA"). (i) The address of Advent is Prudential Tower, 800 Boylston Street, Boston, MA 02199. (ii) The address of AI Alpine and AI Alpine Parent is 2-4 Rue Beck, Luxembourg, Luxembourg L-1222. (iii) The address of ADIA is 211 Corniche Street, PO Box 3600, Abu Dhabi, United Arab Emirates. See response to row 4 on each cover page hereto. Y See response to row 9 on each cover page hereto. The reported securities are directly held by AI Alpine, which is indirectly controlled by AI Alpine Parent. 53.8% of the equity of AI Alpine Parent is indirectly held by various funds and accounts affiliated with Advent LP and its general partner, Advent GP, including Advent International GPE X Limited Partnership, Advent International GPE X-G Limited Partnership, and Advent International GPE X-A SCSp. The board of Advent GP appoints the investment committee of Advent LP (the "Investment Committee"), which Investment Committee has voting and investment power with respect to the securities directly held by AI Alpine. 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 AI Alpine. ADIA is a public institution established by the Government of the Emirate of Abu Dhabi. Pursuant to Rule 13d-4 of the Act, the Reporting Persons declare that filing this statement shall not be construed as an admission that any of the Reporting Persons are beneficial owners of the reported securities, for the purposes of Section 13(d) and/or Section 13(g) of the Act. See response to row 11 on each cover page hereto. See response to row 5 on each cover page hereto. See response to row 6 on each cover page hereto. See response to row 7 on each cover page hereto. See response to row 8 on each cover page hereto. Y N The information set forth in Item 4(a) of this Schedule 13G is incorporated by reference into this Item 6. Y Y Y Y 99.1 Joint Filing Agreement, dated August 13, 2026 Advent International, L.P. /s/ Neil Crawford 08/13/2026 Advent International GP, LLC /s/ Neil Crawford 08/13/2026 AI Alpine (Luxembourg) S.a.r.l. /s/ Jean-Francois Jochum 08/13/2026 /s/ Kremena Popova 08/13/2026 AI Alpine Parent & Cy S.C.A. /s/ Jean-Francois Jochum 08/13/2026 /s/ Kremena Popova 08/13/2026 Abu Dhabi Investment Authority /s/ Ahmed AlNeyadi 08/13/2026 /s/ Saif Surour AlMashghouni 08/13/2026