Factorial Energy began trading on the Nasdaq under ticker FAC on June 8, 2026, after completing its business combination with Cartesian Growth Corporation III, and filed a Form S-1 on June 30 covering the resale of shares tied to the transaction, according to SEC filings and Yahoo Finance. The deal implies roughly $1.3 billion in equity value for the combined company and delivered more than $100 million in gross proceeds earmarked for commercializing Factorial's solid-state battery technology.
Founded in 2013 and based in Billerica, Massachusetts, Factorial manufactures solid-state battery cells using a proprietary dry-coating manufacturing process, targeting markets beyond consumer EVs: defense and aerospace, hyperscale data centers, drones, robotics and e-mobility. That diversified target-market strategy is notable given how much of the solid-state battery narrative in recent years has centered narrowly on passenger EVs.
Stellantis, the automaker formed from the Fiat Chrysler-PSA merger, holds a 9.5% stake in Factorial -- roughly 8.67 million shares -- following the business combination, a meaningful strategic validation from an automaker that has been evaluating solid-state technology as a potential next-generation battery chemistry for years. Solid-state batteries promise higher energy density and improved safety over today's dominant lithium-ion chemistry, though commercial-scale manufacturing has proven difficult across the industry.
“That diversified target-market strategy is notable given how much of the solid-state battery narrative in recent years has centered narrowly on passenger EVs.”
The competitive landscape in solid-state batteries includes QuantumScape and Solid Power, both public companies (tickers QS and SLDP) that have faced their own commercialization timelines and stock volatility as the gap between lab-demonstrated energy density and mass-manufacturable products proved wider than initially projected industry-wide. Factorial's listing adds a third public comparable for investors evaluating the sector's progress.
For climate-tech and deep-tech investors, Factorial's diversification beyond passenger EVs into defense, data centers and robotics is a strategically sound hedge against the volatility and slower-than-hoped adoption curve that has challenged pure-play EV battery suppliers. Data center and defense customers may have different qualification timelines and margin profiles than automotive OEM contracts.
The bear case is the sector's well-documented history of overpromising: solid-state battery companies have repeatedly pushed back commercial-scale production timelines, and a SPAC-merger listing at $1.3 billion prices in execution that hasn't yet been proven at volume. What to watch: Factorial's actual production ramp and yield data, whether the Stellantis relationship converts into binding supply agreements, and how FAC trades relative to QuantumScape and Solid Power as a read on investor patience with the sector.