Oppenhoff advised Rensa Filtration, Inc. on the acquisition of IREMA-Filter GmbH and its US subsidiary Aeolus Filter Corporation from Pinova Capital. With this latest investment, Rensa is reaffirming its commitment to quality and innovation and providing targeted support for technological development, expansion of production capacities, and sustainable growth of the company.
Rensa is a leading designer, manufacturer and distributor of highly engineered, consumable air filtration solutions focused on protecting people and systems in critical environments and applications. Rensa offers a wide range of standard and customized air filtration products that provide best-in-class filtration performance and energy savings in education, healthcare and high-tech manufacturing facilities. Rensa also offers specialized air filtration solutions for data centers and activated carbon filters for the removal of odors and molecular contamination in museums, airports and healthcare facilities.
IREMA, founded 50 years ago near Postbauer-Heng in Germany, is an innovator in filtration media and filter media pleating technologies. Based in Archdale, NC, Aeolus Filter provides filters using IREMA’s media and pleating technologies and has a strong market presence in critical data center and healthcare air filtration applications.
Headquartered in Boston, with offices in San Francisco, New York, London and Hong Kong, Audax Private Equity manages three strategies: its Flagship and Origins private equity strategies, seeking control buyouts in the core middle and lower middle markets, respectively, and its Strategic Capital strategy that provides customized equity solutions to PE-backed portfolio companies to help drive continued growth. With approximately $19 billion of assets under management as of March 2025, over 290 employees, and 100-plus investment professionals, Audax has invested in over 175 platforms and more than 1,400 add-on acquisitions since its founding in 1999. Through this disciplined Buy & Build approach, across six core industry verticals, Audax seeks to help portfolio companies execute organic and inorganic growth initiatives with the aim of fueling revenue expansion, optimizing operations, and significantly increasing equity value.
The Oppenhoff team led by Dr. Markus Rasner included Moritz Schmitz, Lisa Zimmermann (all Private Equity), Dr. Jennifer Zimmermann, Dr. Matthias Klefisch (both Corporate), Dr. Gunnar Knorr, Jan Keesen, Daniel Gellrich (all Tax), Dr. Wolfgang Kotzur (Finance), Vanessa Pickenpack, Sarah Zingel-Hagemann (both Commercial), Marc Alexander Häger, Julia Höyng (both Real Estate), Anja Dombrowsky, Lisa Striegler (both Employment), Dr. Carsten Bormann, Mareike Heesing (both Regulatory), Dr. Simon Spangler (Antitrust), Maximilian Broich (Compliance), Valentino Halim (IT/Data Protection) and Georg Lecheler, Dr. Patric Mau (both Intellectual Property).
Oppenhoff regularly advises on add-ons for private equity portfolio companies, most recently StatLab Medical Products on the acquisition of Histoserve, MRH Trowe Group on the acquisition of Heubeck AG, StatLab Medical Products on the acquisition of Waldemar Knittel Glasbearbeitung, and DISA Global Solutions on the acquisition of SIGNUM Consulting.