Jane Street is a quantitative trading firm and liquidity provider with a unique focus on technology and collaborative problem solving. Founded in 1999 and headquartered in New York City, the firm trades across more than twenty countries in asset classes including ETFs, equities, options, bonds, and commodities.
Deal activity increased 125% year-over-year (9 deals in the last 12 months). Average disclosed round size is $802.7M (across 38 rounds with reported amounts).
Portfolio
38
Fund Size
—
Top Stage
Seed
Last 12 Mo
9
Portfolio Breakdown
Stage Distribution
Sector Distribution
Investment Activity
DealsAvg Round Size
Portfolio
53 investments
| Company | Round | Amount | Date |
|---|---|---|---|
 OXIDE | Series D | — | Oct 2026 |
 Anthropic | Series H | — | May 2026 |
 MatX | Series C | — | Feb 2026 |
 Oxide Computer | Series C | $200M | Feb 2026 |
 Kraken | Growth | — | Jan 2026 |
 Nscale | Series C | $2B | Jan 2026 |
| Anthropic | Series G | — | Jan 2026 |
| AAnthropic, PBC | Series H | — | Jan 2026 |
| AAnthropic, PBC | Series G | — | Jan 2026 |
 Fluidstack | Series A | $830M | Jan 2026 |
| NNscale Global Holdings Limited | Unknown | — | Jan 2026 |
 Antithesis | Series A | $105M | Dec 2025 |
 X Energy | Series D | $700M | Nov 2025 |
| CChuangxin Industries | Ipo | $707M | Nov 2025 |
 EdgeCortix | Series B | — | Nov 2025 |
| NNscale Global Holdings Limited | Series C | $433M | Oct 2025 |
| Anthropic | Series F | $13B | Sep 2025 |
 Thinking Machines | Seed | $2B | Jul 2025 |
| Anthropic | Series E | — | Mar 2025 |
| X Energy | Series C | — | Feb 2025 |
| AAnthropic, PBC | Series E | $3.5B | Jan 2025 |
 CoreWeave | Series C | $1.1B | May 2024 |
 Submer | Series A | $12M | Jan 2024 |
 Magic | Unknown | $320M | Jan 2024 |
| MatX | Series B | $500M | Jan 2024 |
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Top Co-Investors
D1 Capital Partners10 shared
Coatue Management LLC9 shared
Altimeter Capital Management, LP9 shared
General Catalyst9 shared
Blackstone Inc.8 shared
Lightspeed Venture Partners8 shared
Baillie Gifford7 shared
Insight Partners7 shared
Sequoia Capital6 shared
Fidelity Investments5 shared
Tribe Capital5 shared
XN5 shared
MGX5 shared
Greenoaks Capital5 shared
D. E. Shaw Ventures5 shared
Accel4 shared
Spark Capital4 shared
Gemini Frontier Fund4 shared
Last updated: 20 October 2026