Refolk
Sign in

Y Combinator portfolio in San Francisco

The most prolific seed accelerator in the world, batch class twice a year. Filtered to companies headquartered in San Francisco.

Edit the query above, or pick a refinement. 100 free credits on sign-up, no card needed.

Built from a search like: “Y Combinator-backed companies in San Francisco”

Ranked by current headcount across Y Combinator-backed companies in San Francisco. Refreshed daily.

  1. 1
    DoorDash· San Francisco, California, United States
    • Post-IPO debt
    • 80.7k employees
    • Founded 2013
  2. 2
    Airbnb· San Francisco, California, United States
    • Post-IPO debt
    • 68.6k employees
    • Founded 2007
  3. 3
    Instacart· San Francisco, California, United States
    • Private equity
    • 24.8k employees
    • Founded 2012
  4. 4
    Stripe· South San Francisco, California, United States
    • Secondary
    • 15.9k employees
    • Founded 2010
  5. 5
    Twitch· San Francisco, California, United States
    • Series C
    • 14.7k employees
    • Founded 2011
Reveal 1,166 more·100 free credits, no card

Y Combinator portfolio companies in San Francisco

Y Combinator’s San Francisco portfolio is one of the most active recruiting pools in the market. The list above ranks Y Combinator-backed companies headquartered in San Francisco by current headcount, drawn from public LinkedIn and Crunchbase records. With 1,171 matching companies in our index, you can see exactly where the Y Combinator thesis has landed locally.

Y Combinator companies in San Franciscotend to attract a specific type of operator - a founder or early hire bought into both the firm’s thesis and the city’s ecosystem. That makes the engineers and designers at these companies particularly valuable signals.

Refolk lets you reach this pool. Ask for “Y Combinator companies in San Franciscohiring founding engineers” or “founders of Y Combinator-backed companies in San Francisco who left in the last year” and Refolk returns a ranked shortlist with evidence behind each match.

How this list is built

Refolk pulled companies whose disclosed Crunchbase investor list includes Y Combinator and whose HQ is in San Francisco, ranked them by current employee count, and kept those with at least 5 employees. The list refreshes once a day.

Last refreshed: Sun, 21 Jun 2026 09:37:16 GMT

Need a more specific search?

Refolk runs natural-language searches across LinkedIn, GitHub, and the open web. Try one of these:

Related lists

See all company lists.

Or zoom out