The Eiréné #1 fund of Weinberg Capital Partners has become the majority shareholder of Chesneau-Serret, a renowned player in precision mechanics, alongside its management team, David Rémongin and Amélie Pichol, who have significantly increased their equity stake as part of this transaction. UI Investissement and the Chesneau family are also reinvesting in the group.
Founded in 1965 and currently led by David Rémongin and Amélie Pichol, Chesneau-Serret is a key player in high-precision mechanics in France. The group serves advanced markets such as civil and military aerospace, as well as the medical sector. Chesneau-Serret specializes in manufacturing critical parts with complex geometries. The company operates with a team of nearly 100 employees across two sites located in Haute-Marne (Grand Est region) and Drôme (Auvergne-Rhône-Alpes region).
Chesneau, the founding company of the group, has built its success on unique expertise (such as fitting, polishing, machining, inspection, and metrology), its responsiveness, agility, and exceptional precision. In 2021, the group strengthened its capabilities with the acquisition of Serret Mécanique, enabling it to expand its expertise and diversify its client portfolio.
The entry of the Eiréné #1 fund, which specializes in supporting SMEs and mid-sized enterprises (ETIs) in the security and defense sectors, marks a significant milestone for Chesneau-Serret’s growth. This partnership will support the group’s ambitions by consolidating its presence in its traditional markets, accelerating its expansion into new segments, and pursuing an ambitious external growth strategy.
As part of this transaction, the management team has increased its stake in the company. UI Investissement, a shareholder since 2011 that has supported the company’s transformation over the years, as well as the Chesneau family, are reinvesting, demonstrating their confidence in the group’s development potential.
The transaction is expected to be finalized in February 2025.
Founded in 2005, Weinberg Capital Partners is an independent investment company historically active in buy-out capital, which expanded its field of intervention to real estate assets in 2008. In 2020, Weinberg Capital Partners added its capacity to invest in SMEs/mid-caps with a minority strategy focused on sustainable development issues, which offers extra-financial support known as impact, to better prepare companies for environmental and societal challenges. In 2023, Weinberg Capital Partners created a new fund, Eiréné, dedicated to the development of SMEs/mid-caps in the security and defense sector. In 2024, the company continued its growth in private equity with the launch of a co-investment fund, WCP Co-Invest.
With €1,8 billion of assets under management, Weinberg Capital Partners is a significant player in the mid-market equity segment in France.
Weinberg Capital Partners is a signatory of the PRI, a member of the International Climate Initiative and an active responsible investor.
Weinberg Capital Partners supports Télémaque, an association for equal opportunities in education.
For more information: weinbergcapital.com.
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Founded in 1965 and led by David Rémongin and Amélie Pichol, Chesneau-Serret is a leading precision mechanics company in France serving advanced markets such as civil and military aerospace, medical, energy, and high-tech industries.
The group, with nearly 100 employees across two sites in Haute-Marne (Grand Est region) and Drôme (Auvergne-Rhône-Alpes region), provides comprehensive services (machining, fitting, deburring, dimensional measurement, peening, bench testing, balancing, assembly) and engineering solutions, including the development and technical support for specialized machinery.
An independent firm specializing in the development of unlisted French companies, UI Investissement has been working for over 50 years alongside entrepreneurs of startups, SMEs, and mid-sized enterprises to foster sustainable and economically robust growth.
UI Investissement manages over €1.5 billion in assets and collaborates with more than 300 business leaders in key societal sectors, such as healthcare, agribusiness, industry, and services. Development capital and buyout activities, the firm’s historical core, represent more than half of the assets under management, benefiting over 50 companies through operational expertise and methodological tools developed by UI. In addition, its innovation and consolidation teams and investment vehicles support businesses throughout their life cycles, contributing to the economic dynamism of regions.
UI has a team of 80 employees and operates from Paris, supported by over 10 regional offices (Besançon, Clermont-Ferrand, Dijon, Lille, Limoges, Lyon, Nantes, Orléans, Reims, Rennes, Strasbourg).
Press Contact: Laurent Maillard – +33 6 60 59 77 07 – laurent.maillard@ui-investissement.fr
For more information: ui-investissement.fr
Bérengère Beaujean
Head of Communications
berengere.beaujean@weinbergcapital.com
+ 33 7 85 58 29 73
Alain Biquard
Development and Investor Relations Manager
alain.biquard@weinbergcapital.com
+ 33 7 86 36 90 79
