Submer develops and supplies liquid-immersion and direct-liquid cooling systems for data centers, including modular cooling infrastructure for high-density compute.
Submer is consistently named among the immersion cooling leaders alongside GRC, Asperitas, LiquidStack and Midas Immersion Cooling, and it is the most heavily funded of the European immersion names, with USD 102 million raised across seven rounds from nine investors including M&G and Planet First Partners, and 149 employees as of 2026-07-31. Its product line covers immersion and direct cooling through modular pods designed around hardware density while reducing energy and water use. That is where the verifiable record ends, and it is the reason for KEEP-WATCH: the most recent traceable funding event is a conventional debt round on 2024-12-19, and nothing dated was found for 2025 or 2026. In a category where GRC took Samsung money in March 2026, Corintis raised twice in four months, DCX launched an 8 MW unit in January 2026 and Accelsius closed a USD 65 million Series B led by Johnson Controls, a well-funded incumbent going quiet for eighteen months is itself the signal. Revisit trigger: any dated 2026 product launch, customer win or funding round.
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Traction: deployment, production, commercials, progress. Capability: technology, positioning, firepower, leverage.
Submer develops and supplies liquid-immersion and direct-liquid cooling systems for data centers, including modular cooling infrastructure for high-density compute. Submer is consistently named among the immersion cooling leaders alongside GRC, Asperitas, LiquidStack and Midas Immersion Cooling, and it is the most heavily funded of the European immersion names, with USD 102 million raised across seven rounds from nine investors including M&G and Planet First Partners, and 149 employees as of 2026-07-31. Its product line covers immersion and direct cooling thr
Submer is on the AI Core watchlist list of Frontier Tech Intelligence with a score of 50 out of 100, below the Top 100.
Submer is based in Barcelona, Catalonia, Spain.
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