Jane Street

Tracked participation in 6 Atlas companies, with 2 explicitly attributed leads.

6portfolio companies

14round participations

2lead positions

$2.2Bled round total

Conviction

Most recent leads

The latest rounds this investor is sourced as leading, newest first.

Sep 2026FluidstackSeries B$1.5Bat $18B valuation Aug 2026EtchedSeries D (per Etched progress post wording as a production-acceleration round)$700Mat $21B valuation

Capital activity

Portfolio

CompanyLatest valuationFirst → latestRoundsRoleAttributed partner

FFluidstack$18BSep 2026 → Sep 20261 round1 led—

EEtchedChipsEtched is a private AI hardware company building “frontier inference clusters” for serving frontier AI models, with…$21Bvaluation$2.9BraisedRecent roundsSeries D (per Etched progress post wording as a production-acceleration round) · Aug 2026$700M · led by Jane StreetSeries C · Jul 2026$300M · led by Sequoia CapitalMultiple unannounced financings (stealth exit / launch update) totaling $800M · Jun 2026$800M · Andrej Karpathy, Arthur Mensch +11Etched$21BDec 2025 → Aug 20265 rounds1 led—

NNscaleNeocloudsNscale is a privately held AI infrastructure company building and operating “full-stack” neocloud capacity—covering…$14.6Bvaluation$9.8BraisedRecent roundsDebt (Delayed Draw Term Loans; senior secured) · Aug 2026$3B · Goldman Sachs, J.P. MorganRevolving credit facility (debt) · Jul 2026$900M · Bank of America, Crédit Agricole CIB +11Financing for Narvik expansion (debt/structured financing) · May 2026$790M · ABN AMRO, DNB +3Nscale$14.6BMar 2026 → Mar 20261 roundParticipant—

AAnthropic$380BMar 2025 → Feb 20263 roundsParticipant—

TMThinking Machines LabFrontierThinking Machines Lab is an AI research and product company focused on building customizable frontier systems and…$12Bvaluation$4BraisedRecent roundsStrategic corporate investment / corporate participation (announced alongside strategic partnership) · Mar 2026NVIDIAStrategic investment (corporate minority; amount undisclosed) · Mar 2026NvidiaSeed · Jul 2025$2B · led by Andreessen HorowitzThinking Machines Lab$12BJul 2025 → Jul 20252 roundsParticipant—

MMagic—Aug 2024 → Sep 20242 roundsParticipant—

DateCompanyRoundRaisedValuationRoleEvidence

Sep 03, 2026FFluidstackSeries B$1.5B$18BLead

Source ↗+1 ↗

Aug 18, 2026EEtchedChipsEtched is a private AI hardware company building “frontier inference clusters” for serving frontier AI models, with…$21Bvaluation$2.9BraisedRecent roundsSeries D (per Etched progress post wording as a production-acceleration round) · Aug 2026$700M · led by Jane StreetSeries C · Jul 2026$300M · led by Sequoia CapitalMultiple unannounced financings (stealth exit / launch update) totaling $800M · Jun 2026$800M · Andrej Karpathy, Arthur Mensch +11EtchedSeries D (per Etched progress post wording as a production-acceleration round)$700M$21BLead

Source ↗+1 ↗

Jul 23, 2026EEtchedChipsEtched is a private AI hardware company building “frontier inference clusters” for serving frontier AI models, with…$21Bvaluation$2.9BraisedRecent roundsSeries D (per Etched progress post wording as a production-acceleration round) · Aug 2026$700M · led by Jane StreetSeries C · Jul 2026$300M · led by Sequoia CapitalMultiple unannounced financings (stealth exit / launch update) totaling $800M · Jun 2026$800M · Andrej Karpathy, Arthur Mensch +11EtchedSeries C$300M$10.3BParticipant