Sepion Technologies Raises $10 Million In Series B Funding Round

Sepion Technologies has closed a $10 million Series B funding round, led by repeat investor Fine Structure Ventures and featured strategic participation from W. L. Gore & Associates and Syensqo Ventures, joined by Volo Earth Ventures, Chailease, Catalus Capital, Impact Science Ventures, and ACVC Partners. Proceeds will scale U.S.-based polymer production, fulfill existing commercial purchase orders, expand product lines, and strengthen quality systems and operations.

Funding history shows steady progression toward commercialization. Early support included a seed round led by Creative Ventures. In November 2021, Sepion closed an oversubscribed $16 million Series A, also led by Fine Structure Ventures, to accelerate lithium-metal battery commercialization. Non dilutive capital followed, notably a $17.5 million grant in October 2024 from CALSTART and the California Energy Commission’s PowerForward ZEV Battery Manufacturing Grant Program. That award funds construction of a dedicated separator manufacturing facility in West Sacramento’s Capitol Innovation District. The plant targets initial annual output of 50 tons of proprietary polymer and 50 million square meters of coated separator, enough for roughly 50,000 EVs, with production slated to begin in 2027 after Phase I construction and validation. It directly addresses projected domestic separator supply shortfalls and aligns with U.S. priorities for supply chain security and clean energy manufacturing jobs.