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Lightmatter Funding Rounds & Valuation History (2021–2024)

Private Valuation & Funding Round Tracker · Lightmatter

Lightmatter funding rounds & valuation history

Lightmatter, the Mountain View photonics company building optical interconnect (Passage) that moves data between AI chips with light. Funding from the Series B (May 2021) to the Series D (Oct 2024), sourced to SiliconANGLE, TechCrunch, Lightmatter and Gunderson Dettmer.

Last updated: (IST). Every figure re-checked against the linked sources that day. Rows: 3 Currency: US$, nominal
⬇ Download CSV Cite this dataset Methodology & status definitions
Last closed round Closed
$4.4B
$400M Series D, Oct 2024
Raised in rounds listed
$635M
Sum of 3 closed rounds with a disclosed amount (GNF calc.)
Largest round
$400M
Series D, Oct 2024
Closed rounds listed
3
May 2021 to Oct 2024

Round history

Newest first. Dashed badges and striped rows are not closed transactions. “—” means the source does not disclose the figure or it cannot be computed on the same basis; see the note in each row.

Showing 3 of 3 rows
Lightmatter funding rounds, May 2021 to Oct 2024
DateStatusRoundAmountLead / buyerValuationVal. ÷ run-rateSource
Closed round
Series DExisting investors Fidelity Management & Research and GV joined (SiliconANGLE).
$400M
T. Rowe Price Associates
$4.4BStated by Lightmatter
—Not disclosedNo run-rate stated in the announcement
SiliconANGLE, 16 Oct 2024Also: TechCrunch, 16 Oct 2024, Lightmatter, 16 Oct 2024
Closed round
Series C-2
$155M
—Not disclosed
Over $1.2BStated (Lightmatter; Gunderson Dettmer)
—Not disclosedNo run-rate stated in the announcement
Lightmatter, 19 Dec 2023Also: Gunderson Dettmer, 19 Dec 2023
Closed round
Series BWith HP Enterprise, Lockheed Martin, SIP Global Partners, GV, Matrix Partners and Spark Capital (TechCrunch).
$80M
Viking Global Investors
Not disclosedNo company valuation stated by the source
—Not disclosedNo run-rate stated in the announcement
TechCrunch, 6 May 2021
Step-up = valuation ÷ the prior closed valuation (GNF calc.), shown only where both figures were stated or reported and neither is a lower bound.

Valuation at each closed round

Valuations as stated or reported at each closed round with a disclosed figure; talks, tenders and filings are not plotted.

Sources: SiliconANGLE, TechCrunch, Lightmatter, Gunderson Dettmer. US$ billions, linear scale.

Timeline

Each round and share sale, oldest first.

  1. 6 May 2021 · Closed

    Series B: $80M led by Viking Global Investors.

  2. 19 Dec 2023 · Closed

    Series C-2: $155M at Over $1.2B.

  3. 16 Oct 2024 · Closed

    Series D: $400M at $4.4B led by T. Rowe Price Associates.

Still private: Lightmatter has not filed for an IPO and has not been acquired.

Cite this dataset

Free to quote with a link back. Copy this citation:

Lightmatter Funding Rounds & Valuation History. Private Valuation & Funding Round Tracker, GrowthNavigateFunding.net, updated 14 Nov 2026. https://growthnavigatefunding.net/funding/lightmatter/

Download the data

The same 3 rows as the table: numeric US$ columns, empty cells where a figure is not disclosed, and a source URL for every row.

File
lightmatter-rounds.csv (UTF-8, comma-separated)
Stable URL
https://growthnavigatefunding.net/wp-content/uploads/2026/11/lightmatter-rounds.csv
Columns
id, date, date_precision, status, transaction_type, round, amount_usd_low, amount_usd_high, lead_or_buyer, co_leads, valuation_usd_low, valuation_usd_high, valuation_basis, valuation_to_run_rate_multiple, multiple_bound, multiple_basis, step_up_vs_prior_closed, price_per_share_usd_low, price_per_share_usd_high, shares, source, source_url, other_source_urls, notes, last_updated
Updated
(IST)
⬇ Download CSV

Methodology & status definitions

How each row is labelled and calculated.

Closed round

A primary round announced by the company or confirmed in the press, bringing new money to the company.

Valuation ÷ run-rate

Post-money valuation ÷ the run-rate the company stated in that announcement (GNF calc.). Where the run-rate is “crossed” or “over” a figure, the multiple is shown as “under X×”. No row qualifies here unless shown, so no multiple is invented.

What is not a separate row

The 2023 Series C (first close, not re-sourced here), seed and Series A rounds, and secondary sales.

Updates & corrections

This page stays at one address and is updated in place; the “Last updated” date above drives the citation and the dataset metadata. Corrections: hello@growthnavigatefunding.net. Informational only; not investment advice.

Changelog

  • : Dataset first compiled (AI-50 batch, not yet published).

Sources

  1. SiliconANGLE: Lightmatter raises $400M at $4.4B valuation for next-gen photonic data center networking, 16 Oct 2024
  2. TechCrunch: Lightmatter's $400M round has AI hyperscalers hyped for photonic data centers, 16 Oct 2024
  3. Lightmatter: Lightmatter Raises $400M Series D; Quadruples Valuation to $4.4B as Photonics Leader for Next-Gen AI Data Centers, 16 Oct 2024
  4. Lightmatter: Lightmatter Accelerates Growth and Expands Photonic Chip Deployments With $155M in New Funding; Now Valued at $1.2B, 19 Dec 2023
  5. Gunderson Dettmer: Lightmatter Announces $155M Series C-2 and New $1.2B Valuation, 19 Dec 2023
  6. TechCrunch: Lightmatter's photonic AI ambitions light up an $80M B round, 6 May 2021