AttoTude closes $52M Series C led by The Westly Group
What's the deal? AttoTude, a Menlo Park-based startup building a novel interconnect technology for AI data centres, has closed a $52M Series C round led by The Westly GroupDealroom has a profile for this one. Try Dealroom →. New strategic investors Keysight, Allegis CapitalDealroom has a profile for this one. Try Dealroom →, and DNXDealroom has a profile for this one. Try Dealroom → joined the round, alongside existing backers Sutter Hill Ventures, Mayfield, Canaan, and Wing Venture CapitalDealroom has a profile for this one. Try Dealroom →. Total funding now stands at $143M.
The company's core innovation transmits electrical signals directly over dielectric fibre — what it calls "ASIC over Dielectric" — rather than relying on conventional copper or optical approaches. The platform supports per-lane data rates of 200G, 400G, and 800G.
Why now? AI clusters are scaling fast, and the physical links connecting chips inside them are becoming a serious constraint. Copper runs out of steam at the distances and speeds modern GPU clusters demand, while optical interconnects add cost, power draw, and complexity.
AttoTude says its dielectric waveguide approach fills the gap — offering mid-range connectivity without the penalties of either alternative. CEO and co-founder Dave Welch said the company plans first product demonstrations this autumn, marking its shift from research to commercialisation.
What could go wrong? The technology is still pre-product. Moving from lab breakthroughs to reliable, volume manufacturing is notoriously hard in hardware — especially when selling into hyperscalers with exacting supply-chain and reliability standards. AttoTude will need to build out prototypes and establish a scalable supply chain with this funding, a process that carries significant execution risk.
Competition is fierce, too. Established optical and copper interconnect suppliers aren't standing still, and other startups are chasing similar opportunities in the AI infrastructure stack.
The signal: AttoTude's $143M in total funding and its classification as a "breakout stage" company on Dealroom underscore how quickly capital is flowing into the physical layer of AI infrastructure. The round's mix of traditional venture firms — Sutter Hill Ventures, Mayfield, Canaan — alongside corporate strategic investors such as Keysight and DNX suggests the technology is gaining credibility with both financial and industry players, a combination that often precedes serious commercialisation traction.
