EXHIBIT 99.1
 
JOINT FILING AGREEMENT
 
In accordance with Rule 13d-1(k)(1) promulgated under the Securities Exchange Act of 1934, as amended, the undersigned hereby agree to the joint filing with each of the Reporting Persons (as such term is defined in the Schedule 13G referred to below) on behalf of each of them of a statement on Schedule 13G (including amendments thereto) with respect to the Common shares, nominal value EUR 0.04 per share, of INNIO N.V., a public company with limited liability (naamloze vennootschap) under Dutch law, and that this agreement may be included as an exhibit to such joint filing.
 
  
Date: August 13, 2026
 
 
ADVENT INTERNATIONAL, L.P.
   
 
By: ADVENT INTERNATIONAL GP, LLC, GENERAL PARTNER
   
 
/s/ Neil Crawford
 
Name: Neil Crawford
 
Title: Senior Director, Fund Administration
   
 
ADVENT INTERNATIONAL GP, LLC
   
 
/s/ Neil Crawford
 
Name: Neil Crawford
 
Title: Senior Director, Fund Administration
 
  
 
AI ALPINE (LUXEMBOURG) S.A R.L.
AI ALPINE PARENT & CY S.C.A.
   
 
By: AI ALPINE GP S.A R.L., LIQUIDATOR
   
 
/s/ Jean-Francois Jochum
 
Name: Jean-Francois Jochum
 
Title: Manager
   
 
/s/ Kremena Popova
 
Name: Kremena Popova
 
Title: Manager
 
  
 
ABU DHABI INVESTMENT AUTHORITY
   
 
/s/ Ahmed AlNeyadi
 
Name: Ahmed AlNeyadi
 
Title: Authorized Signatory
   
 
/s/ Saif Surour AlMashghouni
 
Name: Saif Surour AlMashghouni
 
Title: Authorized Signatory