Groupe TERA (EPA:ALGTR) sells its subsidiaries TERA Environnement and Toxilabo CELNOR Group
Marseille (France), 12 October 2025,
Groupe TERA (EPA:ALGTR), a leading player in real-time air quality measurement and assessment, has sold TERA Environnement and Toxilabo, two subsidiaries of its “chemical laboratory analysis” business, to CELNOR, backed by Inflexion Private Equity Partners.
Founded in 2001, TERA Environnement is specialised in providing analysis, monitoring and control services for chemical and biological contaminants present in the air and on surfaces. The company performs accredited analyses of ambient air quality, indoor air, outdoor air, emission air, workplace air and soil gases, measuring a wide range of pollutants, including VOCs, fine particles, heavy metals, and PFAS, using passive and active sampling methods.
Through its three accredited laboratories in France (Crolles, Fuveau, and Nantes), TERA Environnement delivers fast, high-quality, and customized services to leading industrial companies including many CAC40 companies, international TIC leaders, Tier 1 Engineering consulting firms, worldwide laboratories and healthcare organizations, all in compliance with regulatory requirements.
Established in 2000, Toxilabo is a subsidiary of Tera Environnement. It supports professionals in occupational health, industrial hygiene, and environmental safety by providing comprehensive testing services to assess and manage chemical risks in workplaces and environments.
The Company offers a full range of capabilities, including air quality testing, surface residue analysis, and biological monitoring through the analysis of samples such as blood, urine, and hair. Their in-house team of chemists and biologist advises clients on sampling strategies, equipment choices, and analysis to ensure compliance with regulatory standards.
Groupe TERA’s “chemical laboratory analysis” business is recognized for its innovation, reliability, and commitment to improving air quality as well as environmental and occupational health through proven and science-driven solutions.
With more than 80 employees, this activity represented 84% of the group’s consolidated revenue in 2024, with an EBITDA margin exceeding 20%.
Founded in 2023 by Simon Parrington, Celnor Group is a UK-based platform bringing together entrepreneur-led companies in the Testing, Inspection, Certification, and Compliance (TICC) sector. Backed by private equity firm Inflexion, Celnor operates across four divisions: Built Environment, Safety & Compliance, Risk Management, and Analytical Sciences, delivering trusted services ensuring people, buildings, and the environment remaining safe and compliant.
With almost 2,000 colleagues, Celnor supports more than 7,000 clients across 40 locations in Europe and North America. Its acquisition model targets high-growth businesses with £2–30m turnover and strong leadership continuity, enabling scale without sacrificing identity. Recent additions include John Turner Consulting (USA), Ethos Environmental Planning, Scaled Solutions, Airey Miller Group and Building Monitoring Services.
Celnor fosters collaboration, technical mentoring, and joint bidding across its network, driving innovation and long-term value. Committed to ESG excellence, the Group continues to champion sustainable practices and regulatory compliance, positioning itself as the most trusted home for specialist TICC firms.
Simon Parrington, CEO & Founder of Celnor Group: « The addition of Tera Environnement and Toxilabo marks another important milestone in Celnor’s international growth journey, becoming our first French Group member. After expanding into the US earlier this year the addition of Tera Environnement and Toxilabo reflects our ambition to build a strong global presence in TICC (Testing, Inspection, Certification, and Compliance) industry. Their market leading position and extensive experience in the industry make them an invaluable addition to the Group. It’s fantastic to see our Analytical Sciences division expand with such a well-known and highly respected team. »
Laurent Lequin, Managing Director of TERA Environnement: « This achievement is a clear demonstration of the unparalleled expertise and capabilities of the teams at TERA Environnement and Toxilabo. The backing of the Celnor Group is a strategic milestone in the development of both companies in France and internationally, offering significant opportunities for growth. »
Alexandre Forget, Managing Partner at Financière de Courcelles: « This groundbreaking transaction for Celnor will also enable Tera Environnement and Toxilabo to leverage the momentum of their new partner to continue their strong growth. This transaction perfectly illustrates both our ability to execute cross-border deals and our expertise in the TICC sectors. »
Pascal Kaluzny, CEO & Founder of TERA Group: « The FDC team understood our objectives and defended our interests with professionalism and rigour in a transaction carried out with a British group. We appreciate the quality of the communication established and the great availability of FDC’s team, all with a consistently pleasant atmosphere. We would be keen to request FDC’s assistance again if a new opportunity arises. ».
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