AttoTude secured $52 million in Series C funding, led by The Westly Group with new investors including Keysight and participation from existing backers. The round, bringing total funding to ~$143 million, accelerates development and commercialization of its THz dielectric waveguide interconnects for high performance AI data centers.
AttoTude recently closed a $52 million Series C funding round. This round was led by The Westly Group, with new strategic investors including Keysight, Allegis Capital, and DNX, alongside participation from existing investors such as Sutter Hill Ventures, Mayfield, Canaan Partners, and Wing Venture Capital. The round brings the company’s total funding to approximately $143 million.
What is AttoTude?
AttoTude, headquartered in Menlo Park, California, develops THz (terahertz) interconnect technology for AI and hyperscale data centers. Founded by Dave Welch (co-founder of Infinera, former CTO/VP at SDL) and Joy Laskar (serial entrepreneur and former Georgia Tech professor), the company focuses on “ASIC over Dielectric” or “THz radio over wire” solutions.
Its core innovation transmits electrical signals directly over low-loss dielectric waveguides/fiber, bypassing traditional copper limitations and avoiding the high costs, power demands, and complexity of photonics/optical interconnects. Key advantages include:
- High bandwidth: Supports per lane rates of 200G, 400G, and 800G.
- Reach: Up to ~40m, suitable for scale-up and scale-out in large AI clusters.
- Efficiency and reliability: Lower power consumption, higher density, better reliability than copper at distance or optics in many scenarios.
- Cost structure: Leverages standard ASIC manufacturing processes.
This addresses critical bottlenecks in AI infrastructure as GPU clusters scale massively, projected needs for tens of millions of high end GPUs by the end of the decade require revolutionary interconnects for parallel processing, low latency, and energy efficiency.
The platform positions AttoTude in the “mid range” connectivity space for AI fabrics, offering a hybrid alternative that combines electrical simplicity with performance closer to optics.
Funding History
- Seed (2024): ~$11 million.
- Series A (2024/early 2025): ~$29–30 million, backed by Sutter Hill Ventures, Canaan Partners, Wing Venture Capital.
- Series B (April 2025): $50 million led by Mayfield, with The Westly Group and existing investors; post money valuation around $446 million. Total to ~$91 million.
- Series C (June 2026): $52 million, total ~$143 million.
The progression shows strong momentum, with increasing participation from strategic and deep tech investors. The Series C valuation details are not publicly disclosed, but the pace reflects confidence in execution within the hot AI infrastructure market.
Funds will support:
- Transition from innovation to product development.
- Building prototypes and first product demonstrations (expected fall 2026).
- Scaling manufacturing and supply chain.
- Expanding customer engagements with hyperscalers and AI infrastructure providers.
- Commercialization and broad deployment readiness.
The company reports strong early customer traction and is preparing for volume production.
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AI training and inference clusters demand ever-higher interconnect performance, density, and efficiency. Traditional copper struggles with reach and signal integrity at scale; optics add cost, power, and integration challenges. AttoTude’s dielectric waveguide approach aims to fill this gap, enabling “everything to everything” connectivity with superior reliability, speed, power, and scale.
Investor perspectives highlight the technology’s potential:
- The Westly Group (lead): Emphasizes positioning to address AI bottlenecks and energy reduction.
- Keysight: Collaboration on emerging THz ecosystem for design enablement and testing.
- Others note the decade level step function innovation in semiconductors/interconnects.
The timing aligns with explosive AI growth, where interconnects are a key constraint. Success could capture significant share in the multi billion dollar data center networking market, particularly for next gen AI fabrics.
Founders bring deep domain expertise in optics, networking, and semiconductors. Rapid progress from seed to Series C in ~2 years, with multiple rounds and product milestones, demonstrates strong execution. Board and investor quality (e.g., Mayfield, Sutter Hill) add strategic support for scaling.
As a pre revenue or early product company in a competitive space, challenges include manufacturing scale-up, integration into customer systems, competition from established players in copper/optics, and broader semiconductor supply dynamics. However, the differentiated tech, experienced team, blue chip investors, and AI tailwinds position AttoTude favorably for leadership in next generation interconnects. The upcoming product demos will be a key validation point.
This Series C underscores market validation of AttoTude’s THz-over-wire platform as a compelling solution for AI’s scaling demands, fueling its path toward commercialization and potential market disruption.
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