Lightmatter
Lightmatter

Lightmatter

Developing photonic computing and interconnect technology to accelerate AI infrastructure and improve energy efficiency.

About

Lightmatter creates photonic supercomputing hardware, including 3D-stacked photonic chips and interconnects, that use light instead of electricity to move data and perform calculations. Their technology addresses critical bottlenecks in AI data centers, such as bandwidth, latency, and power consumption, enabling more scalable and efficient AI model training and inference. Teams look it up for Hardware, Semiconductors, Photonics.

Frequently asked

What does Lightmatter do?

Lightmatter is a Hardware company that offers Hardware. Teams look it up for Semiconductors, Photonics, AI Infrastructure. It is based in Mountain View, United States and was founded in 2017. Public records show about 318 people and $400M raised. Compare it on funding, headcount, reviews and nearby alternatives rather than the marketing line alone.

How much funding has Lightmatter raised?

Lightmatter has raised a total of $400M in funding. The most recent round on record is Series D.

Where is Lightmatter headquartered?

Lightmatter is headquartered in Mountain View, United States.

When was Lightmatter founded?

Lightmatter was founded in 2017.

What industry does Lightmatter operate in?

Lightmatter operates in Hardware, Semiconductors, Photonics, AI Infrastructure, Data Center.

How many employees does Lightmatter have?

Lightmatter has approximately 318 people on record.

Scores
Measured, not editorial
Ahrefs DR
57/100

Strength of the site’s backlink profile, on Ahrefs’ 0-100 Domain Rating scale. Licensed third-party data, not our opinion.

Agent Readiness
45/100

How well an AI agent can read and use this site: structured data, clean markup, and whether key facts are reachable without running JavaScript. We scan the live site.

Site Speed
55/100

Google PageSpeed mobile performance for the company’s own site. Measured by Google, not by us.

Comments
(4)
1 positive4 mixed0 negative
Reddit
r/chipdesignu/Wise-Gur-8978Mar 17, 2026Mixed

I have an interview coming up with Lightmatter for their Analog design team. Has anyone interviewed with them before? If you have, any insight into what they like to ask would be helpful!

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Reddit
r/csMajorsu/Aggressive-Durian922Jan 4, 2026Mixed

Hey, I recently received an offer from Lightmatter for a Data Analytics and AI Intern role. I was wondering about the company’s reputation within the industry. I understand that it’s a startup, but I’d still love to get some perspective.

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Reddit
r/chipdesignu/Vegetable-Attitude71Apr 14, 2025Mixed

Lightmatter announces M1000: multi-reticle eight-tile active 3D interposer enabling die complexes of 4,000 mm^2, and Passage L200. Their big claim is that interconnect is a significant bottleneck for GPU clusters, and that they solve that t…

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Reddit
r/chipdesignu/ButDidUDoCornerSimsSep 10, 2024Mixed

What is your opinion on Lightmatter as a company?

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