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LIGHTMATTER
Lightmatter
Quantum Computing / Photonics · Mountain View, California · United States · Founded · 2017 · ≈ · 100 · employees

Lightmatter Valuation: $12.5B After the Apr 2026 S-1 Filing

IPO filed

Lightmatter was last valued at $12.5B (post-money). It comes from the S-1 Filing of Apr 2026. The company is private, so there is no listed share price.

ProfileValuationFundingCompetitorsStock & IPOHow to invest
Lightmatter valuation · at a glance
Last valuation
$12.5B
POST-MONEY · APR 2026
Lead investors
5
across 7 rounds
Raised across rounds
$823M
7 rounds
Date of last round
Apr 2026
closed 1 Apr 2026
Valuation history

How the Lightmatter valuation has moved

2 valuations. The latest, $12.5B post-money, was set by the S-1 Filing in Apr 2026.

$12.5B
Oct 2024
$4.4B
Series D · post-money
Apr 2026
$12.5BLATEST
S-1 Filing · post-money
+184% vs prior valuation
Latest valuation
$12.5Bpost-money
Set by the S-1 Filing · 1 Apr 2026
×2.8since the $4.4B Series D in Oct 2024
Valuations
2
Priced rounds with a valuation
Event type
Primary round
The S-1 Filing
Funding rounds

Lightmatter rounds and the valuation each one set

7 rounds
Round
Date
Amount
Valuation
Basis
S-1 Filing LATEST
1 Apr 2026
—
$12.5B
POST-MONEY
Series D
16 Oct 2024
$400M
$4.4B
POST-MONEY
Series C
1 Dec 2023
$160M
—
—
Series C
1 May 2023
$150M
—
—
Series B
1 Apr 2021
$80M
—
—
Series A
1 Feb 2019
$22M
—
—
Series A
5 Feb 2018
$11M
—
—
Lead investors
Leads: Fidelity Management & Research Company, GV, Google Ventures, Matrix, T. Rowe Price Associates.
Full funding history — Lightmatter profile ›
What the valuation means

What the $12.5B actually measures

A private valuation is the price agreed in one transaction. The Lightmatter valuation of $12.5B is a post-money figure from the S-1 Filing dated 1 Apr 2026 .

The valuation holds until the next priced round or secondary sale. A private company founded in 2017 with roughly 100 people has no daily price and no order book between rounds.

Where the $12.5B comes from
EventS-1 Filing, dated 1 Apr 2026
Basispost-money
LeadT. Rowe Price Associates, Fidelity Management & Research Company, Google Ventures

Frequently asked questions

Who has invested in Lightmatter?›

Lead investors for each round are in the funding timeline.

Who are Lightmatter's competitors?›

The closest quantum computing / photonics peers are on the competitors page.

How can I get exposure to Lightmatter?›

The routes section explains what is realistically available for a company at this stage.

Is Lightmatter publicly traded?›

Not yet. Lightmatter has filed for an IPO; until it prices, the shares do not trade publicly.

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