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Sienna Private Equity partners with TEC Group and its founder Arnaud Faivre to accelerate its development

Sienna Private Equity (“SPE”), a value-oriented mid-market European Private Equity Fund, closed an investment in TEC Group alongside its founder and CEO, Arnaud Faivre, to accelerate its development. TEC Group is a recognized supplier to the Swiss luxury watchmaking industry, manufacturing critical components for mechanical watch movements and partnering with major luxury watch brands. The transaction closed on October 17th, 2025, together with the acquisition of AMC Technologies, a leading supplier of precision tools. Arnaud Faivre and Stéphane Vagne will lead the combined group.

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Strategic partnership to accelerate growth
Founded in 2008, TEC Group has built a strong reputation for craftsmanship, unique expertise, and industrial capabilities. The company is a trusted partner for watchmakers across Switzerland, offering a comprehensive suite of solutions including component manufacturing, precision turning, design and production of movements, decoration, tooling and machines. With approximately 200 highly skilled professionals, the Group combines technical know-how, operational excellence and long-standing relationships with blue-chip clients. With SPE’s support, TEC Group intends to accelerate its growth trajectory – both organically and through strategic acquisitions – to offer an always broader range of services to its clients.

Leadership Comments
Arnaud Faivre, Founder and CEO of TEC Group, said: “This partnership with Sienna Private Equity marks a new chapter for TEC Group. After nearly two decades of independent growth, we are ready to scale and diversify thanks to additional financial resources while remaining true to our values of excellence and client trust. Together with SPE, we will strengthen our leadership position and continue to serve our clients with unmatched craftsmanship and industrial expertise.”
Thierry Durand, CEO of AMC, said: “AMC is excited to join TEC group, the perfect partner to maintain and develop our unique know-how. We share the same culture of excellence and quality dedicated to the most prestigious watch brands. We look forward to the collaboration with Arnaud Faivre and Stéphane Vagne.”
Vincent Catherine and Hugo d’Avout, Partners at Sienna Private Equity, commented: “This investment reflects our philosophy of partnering with exceptional entrepreneurs to support ambitious industrial projects. TEC Group has all the ingredients to grow further: a strong reputation, a loyal client base and a clear opportunity to scale. Together, we will focus on strengthening the company and building a platform that stands out in the Swiss market.”