# Founders Fund **Entity class:** Venture capital firm **Domain:** Technology Capital / Neurotechnology Investment **Doc Type:** Investor Node **Maturity:** Developed **Collection:** [[collections/Neurotech|Neurotech]] **Primary Sources:** [[research/Research Inferences Integration Report - 2026-10-23|Research Inferences Integration Report — 2026-10-23]] ## Definition **Founders Fund is the San Francisco venture firm co-founded by [[wiki/Peter Thiel|Peter Thiel]] that appears on both sides of the continuity stack: the interface layer and the preservation layer.** It participated in [[wiki/Neuralink|Neuralink]]'s $650 million Series E (June 2025) and led the $58 million Series A of [[wiki/Until Labs|Until Labs]] (23 September 2025), the organ-cryopreservation company. One investor therefore holds positions in reading the brain and in pausing the body. ## Position in the capital graph The register's reading is that when the same investors appear across interface, compute and simulation companies, the portfolio itself is an integration plan, and investor overlap identifies which capabilities are expected to compose before any partnership is announced. Founders Fund is the clearest instance across the acquisition and preservation halves of the stack rather than within one of them. Its Neuralink co-investors in that round included ARK Invest, DFJ Growth, G42, Human Capital, [[wiki/Lightspeed Venture Partners|Lightspeed]], QIA, Sequoia Capital, Thrive Capital, Valor Equity Partners and Vy Capital. ## Open Questions - Whether the firm takes a position in connectomics or emulation, the two stack layers where it is absent. - Follow-on participation in Until Labs or Neuralink rounds after 2025. ## Research Inferences These entries translate the forward-looking register in [[research/Research Inferences|Research Inferences]] into ordinary wiki prose. The tier labels apply to the inference, not automatically to every factual anchor inside it. Proposed IDs above INF-0500 come from the 2026-10-23 cycle: [[research/Research Inferences Integration Report - 2026-10-23|Research Inferences Integration Report — 2026-10-23]] · [[research/Research Inferences Integration Audit - 2026-10-23|Research Inferences Integration Audit — 2026-10-23]]. - **INF-0451 — Analytic.** When the same investors appear across interface, compute, and simulation companies, the portfolio itself is an integration plan. Reading investor overlap identifies which capabilities are expected to compose before any partnership is announced. - **INF-0452 — Strongly indicated.** An investor that also commits research collaboration is buying integration rather than return, which is a materially different relationship from venture financing. The collaboration clause is the informative part of such announcements. - **INF-0235 — Strongly indicated.** Transplant organ banking requires exactly the perfusion, vitrification, and rewarming technology that whole-brain preservation requires. A medical market with immediate demand is funding the physical chemistry that continuity work depends on, which is the most reliable form of technological carry. - **INF-0025 — Analytic.** A $400 billion U.S. addressable-market estimate against a sector raising under a billion a quarter describes an enormous ratio of anticipated value to deployed capital. Ratios that wide are resolved by capital arriving quickly, and the timing of that arrival is a policy variable more than a technology one. ## Relationships - **co_founder:** [[wiki/Peter Thiel|Peter Thiel]]. - **invested_in:** [[wiki/Neuralink|Neuralink]] (Series E, June 2025) · [[wiki/Until Labs|Until Labs]] (Series A lead, September 2025). - **co_investors:** [[wiki/Lightspeed Venture Partners|Lightspeed Venture Partners]] (also in [[wiki/Science Corporation|Science Corporation]]). - **cluster_home:** [[wiki/Capital Routing Node|Capital Routing Node]] · [[wiki/Neurotechnology Ecosystem|Neurotechnology Ecosystem]]. - **investor_peers:** [[wiki/Khosla Ventures|Khosla Ventures]] · [[wiki/In-Q-Tel|In-Q-Tel]] · [[wiki/Double Point Ventures|Double Point Ventures]] · [[wiki/ARCH Venture Partners|ARCH Venture Partners]] · [[wiki/Bezos Expeditions|Bezos Expeditions]]. - **ecosystem:** [[collections/Neurotech|Neurotech]]. ## Sources - [Neuralink raises $650M Series E](https://neuralink.com/updates/neuralink-raises-650m-series-e/) - [Until Labs secures $58M to advance organ cryopreservation technology — HLTH, 23 September 2025](https://hlth.com/insights/news/until-labs-secures-58m-to-advance-organ-cryopreservation-technology-2025-09-23) - [Cryopreservation startup lands $58m to "pause biological time" — Longevity.Technology, 2025](https://longevity.technology/news/cryopreservation-startup-lands-58m-to-pause-biological-time/) As of 23 October 2026.