Ostrea is a French cleantech startup that has developed a patented process to transform discarded seashells—an under-used waste stream of roughly 250,000 t per year in France—into a high-performance, low-carbon material that can replace natural stone and synthetic composites. The product is resin-free, carries a deep-tech label, and has already been specified in more than 200 projects for clients such as AXA, Christian Louboutin and several government offices. To meet rising demand, the company is building a new production site near Rennes that will multiply output capacity by 40 and support a planned European rollout starting in 2025. Ostrea also intends to intensify R&D to secure UPEC certification for flooring and to expand into additional design segments. Management targets €500 k in revenue for 2024 and positions the company as a future leader in low-carbon building solutions. Multiple design awards, including Paris Design Week 2022 and Maison & Objet 2023, underline the brand’s appeal. Continuous investment in innovation and industrial scale-up underpins the firm’s growth strategy.

Total raised

$6M

Funding rounds

1

Latest round

Equity

Latest activity

Nov 2025