JetCool (a Flex Company)

MIT Lincoln-Lab-born microconvective cold-plate startup — Flex acquired it in November 2024 to bolt next-gen DLC onto its global server-manufacturing line.

1. Core Product / Service

JetCool was founded in 2019 in Massachusetts by Bernie Malouin, who had spent 8 years at MIT Lincoln Laboratory leading thermal engineering for high-power defense payloads [7]. The patented technology is microconvective cooling — using impinging microjets of dielectric fluid directly onto the die for significantly lower thermal resistance than conventional microchannel cold plates.

Product line:

• SmartPlate — microconvective cold plates for CPU, GPU, ASIC dies
• SmartPlate Servers — fully liquid-cooled-ready server reference designs developed with Flex
• In-row CDU — JetCool-branded modular CDU due for release April 2026 [5]
• AI XPU custom cold plates — co-developed with Broadcom for next-gen AI accelerators (announced March 2026) [5]

Flex acquired JetCool in November 2024 [2] — making it the first major M&A move in the AI-cooling wave (predating CoolIT → Ecolab, Motivair → Schneider close, Boyd → Eaton). Status: integrated into Flex as JetCool, a Flex Company.

2. Target Users & Pain Points

• Hyperscalers building AI systems — direct sales via Flex's server-manufacturing channel
• Chip designers including Broadcom (XPU cold-plate partnership, March 2026) and historically Intel / Bosch / DuPont (early investors and validation customers)
• Enterprise AI customers needing high-density retrofit
• Server OEMs (via Flex parent) — Flex builds servers for many of the world's largest brands; JetCool now ships inside that pipeline

Pain solved: thermal headroom for the next generation of AI accelerators. As AI XPUs push past 1,500-2,000W TDP, microchannel cold plates approach a thermal wall. Microjet impingement extracts heat with lower thermal resistance, buying density headroom for chip designers who'd otherwise have to derate.

3. Competitive Landscape

JetCool's edge: microconvective / microjet impingement IP — a different physical thermal-transfer principle. Combined with Flex's manufacturing scale + Broadcom partnership, JetCool can ship cold plates inside the AI servers Flex already builds for hyperscalers.

4. Unique Observations

• DLC, with a novel cold-plate physics — JetCool is firmly in the DLC camp, but its cold plate uses impinging microjets rather than the conventional microchannel approach used by most peers. The physics: a microjet array hits the die surface directly, breaking the boundary layer and transferring heat more aggressively than channel flow. Lower thermal resistance = higher kW/cm² extractable from a chip = more headroom for chip designers.
• MIT Lincoln Laboratory provenance: founder Bernie Malouin spent 8 years at MIT Lincoln Laboratory leading thermal engineering for a $100M+ airborne payload program [7]. This is a defense-thermal-engineering pedigree (cooling extreme power densities in tight thermal budgets) repurposed for AI. PhD from RPI in Mechanical Engineering [7].
• NVIDIA / AMD / Intel reference design: JetCool's most-public chip-vendor partnership is Broadcom — the March 2026 announcement of joint cold-plate development for next-gen Broadcom AI XPUs (Google TPU-class custom AI silicon) [5]. Less prominent disclosure on NVIDIA GB200/GB300 reference partnership relative to coolit-systems / Boyd / vertiv — JetCool's wedge is the second-tier AI silicon market (custom XPUs, ASICs) where the conventional DLC vendors haven't locked positions.
• Customer reach via Flex parent: Flex is a $25B+ revenue contract manufacturer building servers for many of the world's largest brands. The JetCool acquisition gives Flex an in-house liquid cooling option to sell into its existing server BoM — instead of buying CoolIT cold plates as a third-party component. This is a vertical integration play: Flex now owns the cold plate that ships inside servers Flex manufactures.
• $/MW cooling capex share: JetCool plays in the cold plate layer of the cooling capex (~$1-2M/MW of the $3-6M cooling stack). Higher pricing potential because microconvective IP can claim a thermal-performance premium, but the addressable market is constrained to chips that benefit from the lower-resistance design. Estimated revenue is still small relative to industry leaders.
• Funding history (pre-acquisition): bootstrapped + DOE ARPA-E COOLERCHIPS grants ($1.2M, May 2023) [7] → $17M Series A on Oct 12, 2023 led by entities including Bosch and DuPont as strategic investors [3][4] → Flex acquisition Nov 2024. Deal value: not publicly disclosed.
• First major M&A in the AI cooling wave: Flex / JetCool (Nov 2024) preceded all the larger industrial M&A — Schneider / Motivair (close Feb 2025, $850M), Ecolab / CoolIT ($4.75B, Mar 2026), Eaton / Boyd ($9.5B, Mar 2026), Daikin / Chilldyne (Mar 2026), Trane / LiquidStack (close 2026). The order suggests JetCool was the leading indicator — a smaller deal but the first marker that AI cooling specialists would all be acquired.

5. Financials / Funding

• Status: acquired by Flex (NASDAQ: FLEX), announced November 2024 [2]
• Deal value: not publicly disclosed [2]
• Series A (Oct 12, 2023): $17M [3][4] — strategic investors including Bosch Ventures and DuPont, plus other VCs
• ARPA-E grant (May 2023): $1.2M from US DOE under the COOLERCHIPS program [7]
• Total raised pre-acquisition: ~$17M disclosed + $1.2M grant
• Revenue / ARR: not disclosed; small relative to industry peers pre-acquisition

6. People & Relationships

• Founder + CEO: Bernie Malouin — PhD in Mechanical Engineering (RPI); 8 years at MIT Lincoln Laboratory as Chief Engineer on a $100M+ airborne thermal payload program [7]
• Founded: 2019, Littleton, MA
• HQ: Littleton, Massachusetts (continues as Flex subsidiary)
• Owner: Flex (NASDAQ: FLEX) since November 2024
• Investors (pre-acquisition): Bosch Ventures, DuPont, plus other strategic and VC investors; US DOE ARPA-E grantee [3][4][7]
• Strategic partnerships: Broadcom — joint development of liquid cooling for next-generation AI XPUs (announced March 2026) [5]
• Strategic context: as Flex's in-house cooling answer to coolit-systems / motivair / Boyd, JetCool occupies a unique vertical position — a cooling specialist owned by a server manufacturer rather than by an industrial cooling parent like Eaton / Schneider / Trane / Daikin. The MIT-defense thermal engineering pedigree + Broadcom XPU partnership makes the bet specifically on next-gen custom AI silicon, where the conventional DLC vendors haven't yet locked positions.