Celestial AI
Photonic Fabric optical interconnect technology for AI data centers
Semiconductors
📍 Santa Clara, CA
Founded 2020
Current Valuation
$2.5B
as of 2025-Q1
UNICORN
Celestial AI develops the Photonic Fabric optical interconnect platform for AI data centers, replacing copper with light to dramatically increase bandwidth between accelerators while reducing power consumption. The company competes directly with Ayar Labs and Lightmatter in the photonics-for-AI category. In March 2025, Celestial AI raised a $250M Series C1 led by Fidelity at a ~$2.5B valuation, bringing total funding to ~$580M. Strategic investors include AMD Ventures and BlackRock.
Company Profile
Growth
Series C1 growth; early customer engagements with hyperscalers
Last Round
Series C1 — $250M (Mar 2025) · Lead: Fidelity Management & Research
Fundraising Status
Series C1 · $250M · 1y 4mo ago
privateTotal raised $580M
Latest Funding Round
| Round | Amount | Date | Lead Investor | Post-Money |
|---|
| Series C1 | $250M | Mar 2025 | Fidelity Management & Research | — |
Founders & Key People
Dave LazovskyPhil Winterbottom
Investors
Fidelity · U.S. Innovative Technology Fund · BlackRock · AMD Ventures · Temasek · Tiger Global
Products
- Photonic Fabric optical interconnect platform
- Optical I/O chiplets for accelerator-to-accelerator communication
- OCS (Optical Circuit Switch) reference designs for AI training
Competitors
Ayar Labs · Lightmatter · Coherent · Marvell (PAM4)
PhotonicsOptical InterconnectAI InfrastructureSemiconductorsHyperscaler
Private-company numbers are not real-time. Reflects publicly disclosed valuations from press releases, news reports, and tender offers as of 2025-Q1. Refreshed quarterly.