Stellantis Is Down 43% In 2026 — Its $126M Solid-State Bet Isn’t Just Hype

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(SeaPRwire) –   By: Oliver Hawthorne

Stellantis stock is down 43% since the start of 2026. Markets dumped the stock 3.7% recently after BMW’s profit warning. The entire European auto sector is under severe pressure right now. Investors assume legacy automakers can’t keep up in the EV race. Solid-state batteries have been 10 years away for 20 years. Most early bets from big carmakers are just PR fluff. No one has delivered working cells that survive real roads, let alone scale. This contradiction makes Stellantis’s new SEC filing far more interesting than any standard press release. Everyone is writing the company off for 2026’s slump, but its biggest long-term bet just crossed from hype into reality.

On June 19, 2026, Stellantis formally disclosed its 9.5% stake in Factorial Energy via SEC filing. The stake is worth roughly $126 million at current market prices. It is split between Stellantis Europe and Stellantis Ventures, covering 8.67 million total shares. Stellantis first backed Factorial back in 2021, with an initial €75 million ($86 million) deal. That initial investment has since converted to plain equity, giving Stellantis a meaningful voice at the startup. Jon Nelson, CEO of Stellantis Financial Services, has been elected to Factorial’s board. The filing notes Stellantis may buy additional stakes in Factorial down the line. It calls the U.S. solid-state startup an attractive long-term investment opportunity. Factorial’s cells hit 375 Wh/kg energy density in controlled lab testing. They charge from 15% to 80% capacity in roughly 18 minutes. Those numbers beat most current commercial lithium-ion cells on both metrics. Stellantis has already integrated Factorial’s FEST cells into a development Dodge Charger Daytona. The company just kicked off public road testing, the first real-world trial for these cells. That moves the technology far beyond limited lab testing that most startups hide behind.

Stellantis’s strategy is not about owning the technology outright. It just wanted enough skin in the game to lock in early access. Solid-state is widely seen as the next major leap in EV battery technology. Early partnerships with working prototypes will matter massively when the technology matures. The big unsolved problem for solid-state remains mass production scaling. No company in the world has cracked that code yet. That is why Stellantis did not overpay for a controlling stake. It got a 9.5% position and a board seat for a relatively small outlay. It gets priority access if Factorial becomes the first to crack scaling. It can influence the startup’s product roadmap to fit its own vehicle needs. The market is obsessed with near-term margin pressure right now. BMW’s profit warning erased near-term confidence across the entire European auto sector. Most investors only see Stellantis’s 43% stock drop in 2026. They fail to price in the company’s long-term positioning for the next decade. By the time mass solid-state production hits the market around 2030, half of today’s legacy automakers will have no reliable supply locked in. Stellantis already secured its spot at the table.

Author bio: Oliver Hawthorne, Principal Correspondent covering EV and advanced battery tech for an international technology review.