Lumilens debuts with $700M war chest at $5.5B valuation

Lumilens has emerged from stealth with more than $700 million in fresh funding, valuing the AI infrastructure startup at $5.51 billion and pushing its total capital raised above $900 million.

The Series C was co-led by Atreides Management, Bain Capital Ventures, Meritech, Seligman Ventures, and Spark Capital, with more than a dozen other investors joining, including Qualcomm Ventures and J.P. Morgan Private Capital.

Two years after its founding, Lumilens is already shipping its first optical interconnect products into a hyperscaler’s production data centres, under what the company describes as a multi-billion-dollar customer agreement.

Connectivity as the new constraint

The company’s founding thesis rests on a shift that has been building across hyperscaler infrastructure for the past two years. As AI clusters scale beyond thousands of GPUs, copper wiring between chips runs into physical limits, bandwidth caps, and power inefficiencies that silicon photonics can address at a level copper cannot.

“The constraint on AI has shifted from how many GPUs you can buy to how many you can connect. Hyperscalers need far more optical capacity and a path to directly connecting thousands of GPUs together into a single cluster. We built Lumilens to deliver both, and manufacture them at the scale this buildout demands,” said founder and CEO Ankur Singla.

Citigroup estimates AI infrastructure spending will exceed $2.8 trillion by 2029, and a growing share is being directed into optics: Nvidia alone has committed $2 billion to Lumentum for silicon photonics manufacturing.

A crowded field with deep capital

Lumilens enters a sector that has become one of the most heavily funded corners of AI infrastructure. Lightmatter raised $400 million in Series D funding in October 2024 at a $4.4 billion valuation. Ayar Labs pulled in $500 million from Nvidia and AMD at a $3.75 billion valuation in March 2026. Celestial AI closed a $750 million Series D in June 2026 at a $6 billion valuation, backed by Fidelity and BlackRock.

What Lumilens claims as differentiation is vertical integration and speed to market. The company’s LumiCore platform combines silicon photonics, mixed-signal integrated circuits, optical systems, and its own manufacturing processes, designed to take products from initial design to customer qualification in months rather than years. While rivals have focused on chip-to-chip optical links, Lumilens targets both scale-up networks within a single system and scale-out networks across a data centre, with a roadmap aimed at binding tens of thousands of GPUs into one cluster.

A repeat founder’s fourth infrastructure company

Singla founded Contrail Systems, acquired by Juniper Networks in 2012 for roughly $176 million, and then built Volterra, an edge-cloud platform that F5 bought for close to $500 million in January 2021. He also started Exaforce, an AI security platform now valued at roughly $725 million, where he remains executive chairman.

Co-founder and CTO Ted Schmidt is a former distinguished engineer at Juniper Networks who worked on its silicon photonics programme after its 2016 acquisition of Aurrion, and has since held senior roles at Lumentum and Effect Photonics. The broader team draws engineers from Cisco, Meta, Marvell, and Coherent.

Mayfield has backed all three of Singla’s prior companies. Managing partner Navin Chaddha said: “Connecting GPUs is the bottleneck now, and copper has hit a wall the industry can’t engineer around.”

Gavin Baker, managing partner at Atreides Management, pointed to the execution timeline: “Lumilens went from its founding to a qualified product deployed inside a hyperscaler’s production data centres within two years, and is building the manufacturing engine to scale with demand while bringing much-needed diversification to AI supply chains.”

What the funding covers

Lumilens will use the new capital to expand silicon, software, systems engineering, and high-volume manufacturing operations to keep pace with hyperscaler demand. Headcount plans were not disclosed.

Lumilens exits stealth with $700M Series C at a $5.51B valuation, backed by Atreides and Bain, with product shipping in hyperscaler data centres.