Lightmatter

Lightmatter makes photonic chips and interconnect platforms for AI supercomputers.

Latest funding

$400M Series B+ · October 21, 2024

Led by T. Rowe Price Associates · Source: fundraisingfox.com

Total raised: $800M across 5 sourced rounds

All 5 rounds ↓

Acquired by CCactus on March 14, 2025 · streetinsider.

Website: lightmatter.com.

X: @lightmatter · 4 followers.

LinkedIn: lightmatter-innovation.

Categories: AI infrastructure and compute Health and bio Robotics and hardware.

Sectors: Health Care, Software.

Stage: Series B+.

Based in: New York, United States.

Total raised: $800M in 5 sourced rounds.

Last round: Oct 21, 2024 · 755 days ago.

Headcount: 11–50 employees.

On Recent Funding since: Sep 29, 2026.

Signals

X account@lightmatter · created Dec 30, 2021 (4 years old) · 4 followers

Website registeredJan 7, 2002 (24 years old)

About Lightmatter

Its products include Passage interconnects and Guide light engines, which scale networking for AI supercomputers. Lightmatter sells hardware products like the Passage L200, designed for frontier-scale training.

TIMELINE · MONEY RAISED

Lightmatter | 3205 days on the record

@lightmatter·Raised $800M in 5 sourced rounds

Money raised, round by round (amounts linked to their source). Pins are dated signals; hover the icons for dates.

Funding rounds

Date	Round	Amount	Lead	Source
Oct 21, 2024	Series B+	$400M	TT. Rowe Price Associates	fundraisingfox.com
Dec 19, 2023	Series B+	$155M	GGV	siliconangle.com
May 31, 2023	Series B+	$154M	—	techcrunch.com
May 6, 2021	Series B+	$80M	VViking Global Investors	techcrunch.com
Feb 5, 2018	Series A	$11M	MMatrix Partners	techcrunch.com

Timeline

March 14, 2025
Acquired by CCactus
Source: streetinsider
December 30, 2021
X account created
January 7, 2002
Website created

Founders and team

BB
Ben Beecher Founder

@kanja · LinkedIn
GH
Greg Hausheer Founder

@greghausheer · LinkedIn

Investors

Companies like Lightmatter

AAyar Labs$150M Series B+ · Sep 2026
EEnfabrica$115M Series B+ · Nov 2024
SSiMa AI$150M Series B+ · Sep 2026
PPsiQuantum$1B Series B+ · Sep 2025
OOxide Computer Company$445M Series B+ · Oct 2026
IIris Light Technologies

Other companies backed by T. Rowe Price Associates

RRedwood Materials$550M Series B+ · Jul 2026
SSambaNova$1B Series B+ · Jul 2026
CClio$500M Series B+ · Nov 2025

T. Rowe Price Associates portfolio →

Sources and API

Every amount links to the page it came from. * Estimated from an accelerator's published standard deal, not a company-specific disclosure. How Recent Funding sources and verifies funding data. The same data as JSON: /api/v1/companies/lightmatter (get a free API key).