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Y Combinator portfolio SaaS companies

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

Built from a search like: “Y Combinator-backed SaaS companies”

Ranked by current headcount across Y Combinator-backed SaaS companies. Refreshed daily.

  1. 1
    Airbnb· San Francisco, California, United States
    • Post-IPO debt
    • 69.2k employees
    • Founded 2007
  2. 2
    Twitch· San Francisco, California, United States
    • Series C
    • 17.5k employees
    • Founded 2011
  3. 3
    Stripe· South San Francisco, California, United States
    • Secondary
    • 14.7k employees
    • Founded 2010
  4. 4
    Café (YC S21)· New York, New York, United States
    • Pre-seed
    • 12k employees
    • Founded 2020
  5. 5
    HubSpot· Cambridge, Massachusetts, United States
    • 12k employees
    • Founded 2006
  6. 6
    Carvana· Tempe, Arizona, United States
    • Post-IPO debt
    • 7.8k employees
    • Founded 2012
  7. 7
    Freshworks· San Mateo, California, United States
    • Secondary
    • 7.4k employees
    • Founded 2010
  8. 8
    Rippling· San Francisco, California, United States
    • Series G
    • 7.2k employees
    • Founded 2016
  9. 9
    Scale AI· San Francisco, California, United States
    • Corporate
    • 6.5k employees
    • Founded 2016
  10. 10
    Reddit, Inc.· San Francisco, California, United States
    • Series F
    • 4.7k employees
    • Founded 2005
  11. 11
    Gusto· San Francisco, California, United States
    • Series A
    • 4.4k employees
    • Founded 2011
  12. 12
    Box· Redwood City, California, United States
    • Post-IPO debt
    • 4.2k employees
    • Founded 2005
  13. 13
    Clipboard· San Francisco, California, United States
    • Series C
    • 3.4k employees
    • Founded 2016
  14. 14
    Kiwify
    • Pre-seed
    • 2.4k employees
    • Founded 2020
  15. 15
    Instawork· San Francisco, California, United States
    • Series D
    • 2.3k employees
    • Founded 2016
  16. 16
    Extern
    • Seed
    • 2.1k employees
    • Founded 2019
  17. 17
    HackerRank· Cupertino, California, United States
    • Series D
    • 2.1k employees
    • Founded 2012
  18. 18
    Homebase· San Francisco, California, United States
    • Series D
    • 1.8k employees
    • Founded 2014
  19. 19
    Magic· San Francisco, California, United States
    • Series unknown
    • 1.8k employees
    • Founded 2014
  20. 20
    Fivetran· Oakland, California, United States
    • Debt
    • 1.8k employees
    • Founded 2012
  21. 21
    Vanta· San Francisco, California, United States
    • Series D
    • 1.7k employees
    • Founded 2018
  22. 22
    Webflow· San Francisco, California, United States
    • Series unknown
    • 1.7k employees
    • Founded 2013
  23. 23
    Checkr, Inc.· San Francisco, California, United States
    • undisclosed
    • 1.7k employees
    • Founded 2014
  24. 24
    Kovi· São Paulo, São Paulo, Brazil
    • Debt
    • 1.7k employees
    • Founded 2018
  25. 25
    Whatnot· Culver City, California, United States
    • Series F
    • 1.7k employees
    • Founded 2019

Y Combinator’s SaaS portfolio

The list above ranks Y Combinator-backed SaaS companies by current headcount, drawn from public LinkedIn and Crunchbase records. 1,770 matching companies in our index give you a quick read on where Y Combinator has gone deepest in the SaaS space.

Y Combinator’s SaaS bets tend to share a thesis. The engineers, ML researchers, and founders inside these companies are often building the same primitives — and they show up in SaaS talent pools across the next decade.

Refolk converts this list into a live search. Ask for “Y Combinator SaaScompanies hiring senior engineers” or “founders of Y Combinator-backed SaaScompanies” and Refolk returns a fresh ranked shortlist.

How this list is built

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

Last refreshed: Thu, 07 May 2026 06:35:56 GMT

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