A slightly modified Mercedes-Benz EQS equipped with solid-state battery cells from Factorial Energy traveled from Stuttgart to Malmö on public roads in 2025 using just one charge. The vehicle reached Sweden with 137 kilometers of remaining range after traveling 1,205 kilometers, or 748 miles. That was the kind of outcome that makes engineers and investors pay close attention to a technology that has been promised for years in electric vehicles but has never reached scale.
After completing its SPAC merger with Cartesian Growth Corporation III, Factorial, a Boston-based business with a pilot plant in Cheonan, South Korea, partnerships with Mercedes-Benz, Stellantis, Hyundai, and now the U.S. national security investment arm In-Q-Tel, went public on June 8, 2026, under the Nasdaq ticker FAC. As soon as the stock started trading, it did what post-SPAC equities usually do: move sharply, in both directions, and at irregular intervals.
The company’s investor pitch revolves around its two technological platforms. Factorial’s core solid-state electrolyte technology, FEST®, is a sulfide-based method that the company has been working on since 2012 and has now proven through customer cell shipments and a cooperation with Mercedes. The next-generation platform, SolsticeTM, offers up to 80% more energy density than traditional lithium-ion batteries while operating steadily at temperatures as high as 90 degrees Celsius, which is much higher than the thermal ceiling of liquid electrolyte batteries. Stellantis intends to include the technology into a showcase fleet constructed on its STLA Large platform.
The company has tested 77 Ah Factorial cells in the lab, demonstrating their high energy density and fast-charging performance across temperature extremes. In collaboration with Karma Automotive and the company’s 1,000-horsepower Kaveya super-coupe, Factorial began what it claims is the first solid-state battery production program for passenger cars in the United States in February 2026. One deployment at a time, the technology is transitioning from a lab setting to a more commercial one.
Apart from the automobile ties, In-Q-Tel’s January 2026 investment is noteworthy. The U.S. intelligence and national security community’s non-profit venture arm, In-Q-Tel, has historically supported technologies like Palantir and satellite imagery firms before their applications gained widespread recognition.
When In-Q-Tel supports an energy storage firm, it usually does so because the company’s technology can be used for extended-range drone operations, autonomous systems, or field-deployable power in situations where existing lithium-ion batteries are insufficient. That reasoning is supported by Factorial’s foray into drone applications, which includes a 2025 shipment of flight-ready cells to Avidrone, a long-range cargo drone manufacturer. The story surrounding eMobility partnerships has significantly expanded.
The stock itself exhibits the typical traits of a newly listed pre-revenue technology company backed by a SPAC. The 52-week range, which spans from $9.26 to $25.33, illustrates the contrast between optimism and pessimism that surrounds a company with minimal present revenue and high technology validation. With no earnings multiple to apply, no revenue run rate to multiple, and no near-term cash flow to discount, the market cap of roughly $1.6 billion cannot be valued using standard metrics.
What is in place are a number of collaborations with reliable defense and automotive partners, a pilot factory that has manufactured deliverable cells, and a technology that achieved an outcome in a Mercedes on a German highway that no lithium-ion battery could equal. It is difficult to ignore the fact that the performance data is authentic. The business is not yet profitable. Traditional metrics don’t apply. However, the drive from Stuttgart to Malmö took place, and that is not insignificant.
