The rounds this investor is named on, who it invests beside, and where it shows up.
Named on 18 rounds in the feed, most often at Series D+ and in AI.
Jane Street is a research-driven trading firm where curious people work together on deep problems.
Corporationjanestreet.comRounds from 2024-08-29 to 2026-10-09
| Company | Round | Amount | Announced | Role |
|---|---|---|---|---|
Oxide Computer Company A full-stack private-cloud alternative to AWS/Azure/GCP for AI workloads | Series D Verified against 4 of 18 sources | $445M | 2026-10-09 | [ PART ] |
Etched Etched sells advanced AI hardware solutions, specifically frontier inference clusters and semiconductor technology, targeting large-scale AI model deployments and hyperscalers. | Funding round |
| $700M |
| 2026-08-18 |
| [ LEAD ] |
Firmus Technologies Creating the most efficient AI infrastructure | Growth Verified against 1 of 2 sources[ HISTORY ]: An earlier round, from the company's own announcement, found while researching the company. Checked like any round, but not new, so it stays out of the daily feed and alerts; a date range shows it. | $2.0B | 2026-08-07 | [ PART ] |
Etched Etched sells advanced AI hardware solutions, specifically frontier inference clusters and semiconductor technology, targeting large-scale AI model deployments and hyperscalers. | Series C Verified against 1 source[ HISTORY ]: An earlier round, from the company's own announcement, found while researching the company. Checked like any round, but not new, so it stays out of the daily feed and alerts; a date range shows it. | $300M | 2026-07-23 | [ PART ] |
Anthropic Anthropic is an AI safety and research company that builds the Claude family of AI models, apps, and developer platform. | Series H Verified against 2 of 10 sources[ REPORTED LATER ]: This round was announced before Fireround first saw it. It stays in the company's history, not in Latest, Trending, or alerts. | $65B | 2026-05-28 | [ PART ] |
Nscale Nscale full-stack AI cloud platform and services are designed for scale, resilience, and speed. | Series C Verified against 1 of 4 sources[ HISTORY ]: An earlier round, from the company's own announcement, found while researching the company. Checked like any round, but not new, so it stays out of the daily feed and alerts; a date range shows it. | $2.0B | 2026-03-09 | [ PART ] |
MatX High-throughput semiconductor chips designed for large model needs in frontier labs. | Series B Verified against 4 of 9 sources[ REPORTED LATER ]: This round was announced before Fireround first saw it. It stays in the company's history, not in Latest, Trending, or alerts. | $500M | 2026-02-24 | [ LEAD ] |
Anthropic Anthropic is an AI safety and research company that builds the Claude family of AI models, apps, and developer platform. | Series D+ Verified against 4 of 7 sources[ HISTORY ]: An earlier round, from the company's own announcement, found while researching the company. Checked like any round, but not new, so it stays out of the daily feed and alerts; a date range shows it. | $30B | 2026-02-12 | [ PART ] |
Oxide Computer Company A full-stack private-cloud alternative to AWS/Azure/GCP for AI workloads | Series C Verified against 1 of 3 sources[ HISTORY ]: An earlier round, from the company's own announcement, found while researching the company. Checked like any round, but not new, so it stays out of the daily feed and alerts; a date range shows it. | $200M | 2026-02-10 | [ PART ] |
Antithesis Antithesis is an autonomous software testing platform that finds the bugs others miss. | Series A Verified against 1 of 6 sources[ REPORTED LATER ]: This round was announced before Fireround first saw it. It stays in the company's history, not in Latest, Trending, or alerts. | $105M | 2025-12-03 | [ LEAD ] |
Numerata A developer of AI-powered software development tools | Seed Developing, 2 sources[ REPORTED LATER ]: This round was announced before Fireround first saw it. It stays in the company's history, not in Latest, Trending, or alerts. | n/a | 2025-11-28 | [ LEAD ] |
X-energy X-energy is an advanced nuclear reactor & fuel company. | Series D Verified against 2 of 3 sources[ HISTORY ]: An earlier round, from the company's own announcement, found while researching the company. Checked like any round, but not new, so it stays out of the daily feed and alerts; a date range shows it. | $700M | 2025-11-24 | [ LEAD ] |
Kraken Kraken is a cryptocurrency exchange platform that enables individuals and businesses to buy, sell, and trade cryptocurrencies and stocks. | Two tranches Verified against 1 of 3 sources[ HISTORY ]: An earlier round, from the company's own announcement, found while researching the company. Checked like any round, but not new, so it stays out of the daily feed and alerts; a date range shows it. | $800M | 2025-11-18 | [ LEAD ] |
Anthropic Anthropic is an AI safety and research company that builds the Claude family of AI models, apps, and developer platform. | Series F Verified against 1 of 2 sources[ HISTORY ]: An earlier round, from the company's own announcement, found while researching the company. Checked like any round, but not new, so it stays out of the daily feed and alerts; a date range shows it. | $13B | 2025-09-02 | [ PART ] |
Thinking Machines Lab Thinking Machines Lab sells artificial intelligence research and products that aim to make AI systems widely understood and customizable for various human needs. | Seed Verified against 1 of 3 sources[ HISTORY ]: An earlier round, from the company's own announcement, found while researching the company. Checked like any round, but not new, so it stays out of the daily feed and alerts; a date range shows it. | $2.0B | 2025-07-15 | [ PART ] |
Anthropic Anthropic is an AI safety and research company that builds the Claude family of AI models, apps, and developer platform. | Series E Verified against 1 source[ HISTORY ]: An earlier round, from the company's own announcement, found while researching the company. Checked like any round, but not new, so it stays out of the daily feed and alerts; a date range shows it. | $3.5B | 2025-03-03 | [ PART ] |
X-energy X-energy is an advanced nuclear reactor & fuel company. | Series C Verified against 1 of 3 sources[ HISTORY ]: An earlier round, from the company's own announcement, found while researching the company. Checked like any round, but not new, so it stays out of the daily feed and alerts; a date range shows it. | $700M | 2025-02-06 | [ PART ] |
Magic Magic builds frontier code models to automate software engineering and AI research, targeting organizations and researchers involved in AI development. | Fundraising round Verified against 1 of 2 sources[ HISTORY ]: An earlier round, from the company's own announcement, found while researching the company. Checked like any round, but not new, so it stays out of the daily feed and alerts; a date range shows it. | $320M | 2024-08-29 | [ PART ] |