The Chesneau-Serret Group, a leading player in high-precision mechanics, takes a new step forward with the acquisition of LGB, a specialist in machining complex parts. This transaction, carried out with the support of Weinberg Capital Partners through its Eiréné fund — the group’s majority shareholder — and UI Investissement, marks a defining moment in Chesneau-Serret’s development. It will enable the group, led by David Rémongin and Amélie Pichol, to strengthen its offering, diversify its client portfolio, and reach a critical size.
Founded in 1965, Chesneau-Serret has established itself as a leading player in high-precision mechanics in France. The group designs and manufactures critical parts with complex geometries for demanding sectors such as civil and military aeronautics, as well as the medical industry. It relies on a team of nearly 100 employees spread across two sites located in Haute-Marne (Grand Est) and Drôme (Auvergne-Rhône-Alpes).
Founded in 1967, LGB specializes in multi-axis machining of precision mechanical parts for the defense and aeronautics industries. Based in the Centre-Val-de-Loire region, the company offers a wide range of expertise at its 3,000-square-meter site, which brings together nearly 40 employees: machining, electrical discharge machining, grinding, dimensional inspection, and associated services. The group also has a design office, enabling it to finalize the development of parts requested by clients when needed.
This upcoming merger is based on strong technical and commercial complementarity between the two companies. It will allow Chesneau-Serret to expand its client portfolio and service offering while increasing its production capacity.
Already well-known in its markets, Chesneau-Serret is thus consolidating its position with major contractors in the defense and aerospace sectors.
Following the transaction, the group will reach a turnover of nearly €25 million.
This merger comes less than a year after Eiréné’s entry into Chesneau-Serret’s capital and is fully aligned with the fund’s sector consolidation strategy.
The transaction is expected to be finalized by the end of 2025, subject to the usual conditions precedent.
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 €1,9 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 player in high-precision mechanics in France, serving cutting-edge markets such as civil and military aeronautics, medical, energy, and advanced industry.
The group, supported by a team of nearly 100 employees across two sites located in Haute-Marne (Grand Est) and Drôme (Auvergne-Rhône-Alpes), offers its clients comprehensive services (machining, fitting, radiusing, three-dimensional measurement, lapping, bench testing, balancing, assembly) as well as engineering capabilities (development and technical support on special-purpose machines, for example).
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
