Valeo Surges 40% as Traders Bet on AI Data Center Cooling

French auto parts maker Valeo has become an unexpected entry on the AI infrastructure trade. According to Bloomberg, the company's shares surged 18% in a single session on June 3 — the largest single-day rise since March 2020 — and have now climbed roughly 40% year-to-date while the broader STOXX Auto index is down about 10%. The catalyst is analysts at JPMorgan and Jefferies arguing that Valeo's decades of automotive thermal management expertise map directly onto what AI data centers urgently need: efficient, reliable liquid cooling for racks running at densities that air cooling simply cannot handle.

JPMorgan estimates the data center liquid cooling market could reach $50 billion by 2035, and Jefferies pointed to Valeo's "power and thermal management opportunities (BESS, data centres) gaining momentum" as the company pivots from a sector in decline into one flush with AI capex. Valeo gave the narrative a concrete anchor on June 9, 2026, when it signed a memorandum of understanding with startup Calyos to develop passive two-phase Loop Heat Pipe cooling systems for data centers, a maintenance-free technology designed to retrofit existing air-cooled server infrastructure without a full rack overhaul. JPMorgan also framed the appeal in geopolitical terms, noting that Valeo's reliance on Western-sourced components positions it as a "reliable partner" in a supply chain environment markets currently reward.

The honest caveat is that an MoU is not a product, and Valeo's core automotive business is still navigating a global auto production environment that contracted around 3.4%. A stock that has repriced this sharply on analyst enthusiasm and a preliminary partnership announcement bears watching if the commercial pipeline stays thin. Q1 2026 sales of €5.1 billion, up just 1.3% on a like-for-like basis, still reflect a predominantly automotive company. The question for investors is whether thermal management expertise built for engine compartments translates fast enough into chip cooling revenues to justify a stock priced as though it already has.

What the reporting does not resolve is how much of Valeo's revenue today actually comes from data center work versus its automotive baseline. The company's 2026 guidance of €20-21 billion in sales is grounded in a business that remains car-dependent; the data center story is still a forward bet on capability, not a current earnings line. The broader pattern worth watching: AI infrastructure spending is now large enough to reprice industrial stocks several steps removed from hyperscalers and chipmakers. Valeo is one data point, but the dynamic is likely wider.