KAJSA RYTTBERG-WALLGREN APPOINTED CEO OF INFINITERIA
Luxembourg, November 27, 2025 — Infiniteria, the joint venture between Antin Infrastructure Partners, Scandinavian Enviro Systems, and Michelin that is developing a global tire recycling platform, announces the appointment of Kajsa Ryttberg-Wallgren as Chief Executive Officer, effective December 1.
Ms. Ryttberg-Wallgren succeeds Stefano Madeddu, who will remain as an advisor to Infiniteria after heading the company since its inception in 2023.
Ms. Ryttberg-Wallgren joins Infiniteria from Stegra, the Swedish company dedicated to decarbonizing the hard-to-abate steel industry, where she was Chief Growth Officer since 2021. She brings extensive experience in industrial businesses and in establishing new businesses across the world, having previously occupied executive roles in a range of Scandinavian companies such as PIAB, Yara International, Sandvik and Sapa. She is also a Board member of PowerCell Group and WTR Group AB.
Infiniteria is currently building its first plant in Uddevalla, Sweden, which is expected to start operations in 2026. It plans to establish further end-of-life tire recycling plants across Europe. The company relies on Enviro’s patented tyre pyrolysis technology to produce re-usable materials from end-of-life tires, forming a fully circular process that will contribute to a significant reduction in carbon dioxide emissions.
Anand Jagannathan, Senior Partner of Antin Infrastructure Partners NextGen strategy, commented: “We’re delighted to welcome Kajsa Ryttberg-Wallgren as CEO of Infiniteria. She offers a strong combination of Swedish industrial experience, a track-record in international expansion and strong sustainability credentials, all of which are highly relevant for Infiniteria and the journey ahead of us. We’d like to thank Stefano Madeddu for his many contributions to Infiniteria, establishing the joint venture and putting it on track for growth across Europe. We’re very pleased that he will continue to be involved with the business in an advisory capacity, allowing us to continue drawing on his valuable experience.”
Incoming CEO Kajsa Ryttberg-Wallgren added: “I am truly excited to join Infiniteria as CEO at such a pivotal moment. Thanks to Stefano Madeddu, the team, and our partners we now stand with a first-of-its-kind plant nearing completion and a production and business concept ready to scale. I am grateful to Antin for their trust and look forward to working closely with the entire organization as we enter commissioning and expand across Europe. Together, we will build a circular and profitable business that makes a real difference for the planet and the generations to come.”
About Infiniteria:
Infiniteria is a joint venture formed between Antin Infrastructure Partners, Scandinavian Enviro Systems and Michelin to establish the world’s first large-scale tyre recycling platform. It relies on Enviro’s patented tyre pyrolysis technology, to produce re-usable materials from end-of-life tyres, forming a fully circular process. The first plant is under construction in Uddevalla, Sweden and this will be followed by additional plants across Europe.
About Antin Infrastructure Partners
Antin Infrastructure Partners is a leading private equity firm focused on infrastructure. With over €33 billion in assets under management across its Flagship, Mid Cap and NextGen investment strategies, Antin targets investments in the energy and environment, digital, transport and social infrastructure sectors. With offices in Paris, London, New York, Seoul, Singapore and Luxembourg, Antin employs over 240 professionals dedicated to growing, improving and transforming infrastructure businesses while delivering long-term value to portfolio companies and investors. Majority owned by its partners, Antin is listed on Euronext Paris (Ticker: ANTIN – ISIN: FR0014005AL0).