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Founders Fund AI portfolio in San Francisco

Contrarian venture firm investing in deeptech, defence, and breakthrough software. Filtered to AI companies headquartered in San Francisco.

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Built from a search like: “Founders Fund-backed AI companies in San Francisco”

Ranked by current headcount across Founders Fund-backed AI companies in San Francisco. Refreshed daily.

  1. 1
    OpenAI· San Francisco, California, United States
    • Series unknown
    • 9.4k employees
    • Founded 2015
  2. 2
    NewLimit· South San Francisco, California, United States
    • Series C
    • 55 employees
    • Founded 2022
  3. 3
    UNITY Biotechnology· South San Francisco, California, United States
    • Post-IPO debt
    • 19 employees
    • Founded 2009
  4. 4
    Siren Biotechnology· San Francisco, California, United States
    • Grant
    • 9 employees
    • Founded 2020
  5. 5
    Stemcentrx, Inc.· South San Francisco, California, United States
    • Series G
    • 6 employees
    • Founded 2008

Founders Fund-backed AI companies in San Francisco

The list above ranks Founders Fund-backed AI companies headquartered in San Francisco by current headcount, drawn from public LinkedIn and Crunchbase records. With 5 matching companies in our index, you can see exactly where Founders Fund’s AI thesis has landed in San Francisco.

Three filters - investor, industry, city - narrow the field to a tight cluster of operators with overlapping incentives. They share a thesis, a network, and a market. Hiring from this list usually means hiring someone already inside the Founders Fund AI world in San Francisco.

Refolk converts this list into a live search. Ask for “Founders Fund AI companies in San Franciscohiring senior engineers” or “founders of Founders Fund-backed AI companies in San Francisco who left in the last year” and Refolk returns a ranked shortlist.

How this list is built

Refolk pulled AI companies headquartered in San Francisco whose disclosed Crunchbase investor list includes Founders Fund, ranked them by current employee count, and kept those with at least 3 employees. The list refreshes once a day.

Last refreshed: Sun, 21 Jun 2026 11:02:24 GMT

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