Lightmatter is a AI Infrastructure / Semiconductors founded in 2017, currently valued at $4.4B. IPO Status: S-1 Filed in April 2026. IPO Readiness Score: 80/100 (B+).
Lightmatter IPO status, timeline, valuation and S-1 filing tracker. Last updated May 2026.
| Industry | AI Infrastructure / Semiconductors |
| Stage | Series E |
| IPO Status | Private |
| Valuation | $4.4B |
| Total Funding | $850M |
| Headquarters | Mountain View, CA |
| IPO Readiness Score | 80/100 |
| Founded | 2017 |
Track Lightmatter IPO status, valuation updates, and S-1 filing milestones on TechStackIPO. Last updated May 2026.
Photonic computing company building silicon photonics chips and interconnects for AI data centers. Series D ($400M, $4.4B valuation, Oct 2024). CEO Nick Harris called it "probably our last private funding round" — IPO timeline uncertain but expected post-2026.
Lightmatter has filed an S-1 registration statement with the SEC in April 2026, signaling active preparation for a public listing. Companies that reach the S-1 filing stage typically price their IPO within 3–6 months of filing, though market conditions, regulatory review, and investor demand can affect the timeline. TechStackIPO monitors all S-1 amendments, pricing updates, and roadshow activity for Lightmatter.
Lightmatter is valued at $4.4B based on the most recent private market data. The company has raised a total of $850M in funding. Private market valuations are determined by the latest funding round and may differ from eventual IPO pricing, which reflects public market conditions, investor demand, and comparable company multiples at the time of listing.
Accredited investors may be able to access Lightmatter pre-IPO shares through secondary market platforms. These platforms facilitate private share transactions between existing shareholders (employees, early investors) and new buyers.
Risk factors: Pre-IPO investments are illiquid, carry higher risk than public market investments, and are typically restricted to accredited investors. Share availability and pricing depend on current shareholders willing to sell. TechStackIPO provides data and tracking tools but does not facilitate or recommend investments.
Funding rounds from seed through latest — Series A, B, C and beyond.
| Round | Date | Amount | Valuation | Lead Investor(s) |
|---|---|---|---|---|
| Series A | Nov 2019 | $11M | $50M | Matrix Partners |
| Series B | Jul 2020 | $22M | $120M | GV |
| Series C | Dec 2023 | $155M | $1.2B | GV |
| Series D | Oct 2024 | $400M | $4.4B | T. Rowe Price |
Total funding raised: $850M
Bear / base / bull scenarios based on current private market valuation and comparable IPO multiples.
| Scenario | Est. Valuation | Basis |
|---|---|---|
| Bear | $7.5B | Compressed multiples, delayed listing |
| Base | $4.4B | Last private round valuation |
| Bull | $14.0B | Strong market, premium AI/tech multiple |
Estimates are illustrative. Not investment advice. All figures based on publicly available data.
Lightmatter's most recent valuation is $4.4B, based on its November 2024 Series D round ($400M). The company has raised approximately $850M in total. Investors include Google, SoftBank, T. Rowe Price, and GV (Google Ventures).
Lightmatter builds photonic (light-based) chip interconnects that connect AI accelerators in data centers. Its Passage product replaces electrical interconnects with optical ones, reducing latency and power consumption for AI training clusters. Customers include major cloud providers building AI supercomputers.
There is no confirmed Lightmatter IPO date. The company raised $400M in November 2024 at a $4.4B valuation from investors including Google, SoftBank, and T. Rowe Price. Lightmatter is focused on scaling its Passage photonic interconnect product before pursuing a public listing.
Lightmatter IPO status 2026: Not filed. Lightmatter has not filed an S-1 as of May 2026. The company is valued at $4.4B and builds photonic (light-based) interconnects for AI data centers. No IPO timeline has been confirmed.
Lightmatter has an IPO readiness score of 80/100 on TechStackIPO. A high readiness score suggests IPO activity could occur within the next 1–2 years.
Lightmatter's last known private valuation is $4.4B. IPO valuations typically reflect current market conditions at time of listing and may differ from private market valuations.
Pre-IPO access options may include: (1) secondary market platforms such as Forge Global or EquityZen that facilitate private share sales, (2) ETFs holding pre-IPO companies or venture portfolios, and (3) direct secondary share purchases if eligible as an accredited investor. TechStackIPO tracks availability but does not facilitate investments.
Yes. Lightmatter has filed an S-1 registration statement with the SEC on April 12, 2026.
Lightmatter operates in the AI Infrastructure / Semiconductors sector. TechStackIPO tracks multiple AI Infrastructure / Semiconductors companies from seed through IPO, including their funding rounds, valuations, and IPO readiness scores. You can compare Lightmatter against other AI Infrastructure / Semiconductors companies using TechStackIPO's comparison tool.
Lightmatter is at the Series E stage. The company has raised a total of $850M in funding. Companies at this funding stage are typically scaling operations, expanding market share, and evaluating public market timing.
Lightmatter is headquartered in Mountain View, CA. The company's location can influence IPO exchange selection, regulatory requirements, and investor interest. Companies headquartered in major tech hubs often benefit from proximity to venture capital networks and talent pools.