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Y Combinator portfolio in New York

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

Built from a search like: “Y Combinator-backed companies in New York”

Ranked by current headcount across Y Combinator-backed companies in New York. Refreshed daily.

  1. 1
    Café (YC S21)· New York, New York, United States
    • Pre-seed
    • 12k employees
    • Founded 2020
  2. 2
    Nourish· New York City Metropolitan Area
    • Series B
    • 3k employees
    • Founded 2021
  3. 3
    Optimizely· New York, New York, United States
    • Debt
    • 1.6k employees
    • Founded 2010
  4. 4
    Outschool· United States Oval Historic District, New York, United States
    • Series D
    • 1.5k employees
    • Founded 2015
  5. 5
    ACLU· New York, New York, United States
    • Seed
    • 1.2k employees
    • Founded 1920
  6. 6
    Seeking Alpha· New York, New York, United States
    • Seed
    • 947 employees
    • Founded 2005
  7. 7
    Genius· New York, New York, United States
    • Series unknown
    • 764 employees
    • Founded 2009
  8. 8
    Photoroom· New York, New York, United States
    • Series B
    • 680 employees
    • Founded 2019
  9. 9
    H1· New York, New York, United States
    • Series unknown
    • 533 employees
    • Founded 2017
  10. 10
    Veriff· New York, New York, United States
    • Series C
    • 523 employees
    • Founded 2015
  11. 11
    Kalshi· New York, New York, United States
    • Corporate
    • 455 employees
    • Founded 2019
  12. 12
    Legacy· New York, New York, United States
    • Series unknown
    • 422 employees
    • Founded 2018
  13. 13
    UPchieve· Brooklyn, New York, United States
    • Grant
    • 377 employees
    • Founded 2016
  14. 14
    Toko· Brooklyn, New York, United States
    • Pre-seed
    • 376 employees
    • Founded 2021
  15. 15
    Ophelia· New York, New York, United States
    • Series B
    • 357 employees
    • Founded 2020
  16. 16
    Fullstack Academy· Brooklyn, New York, United States
    • Seed
    • 351 employees
    • Founded 2012
  17. 17
    Stepful· New York, New York, United States
    • Series B
    • 342 employees
    • Founded 2021
  18. 18
    Titan· New York, New York, United States
    • Series unknown
    • 339 employees
    • Founded 2017
  19. 19
    Rainbow· Brooklyn, New York, United States
    • Seed
    • 324 employees
    • Founded 2019
  20. 20
    Metal· Brooklyn, New York, United States
    • Pre-seed
    • 324 employees
    • Founded 2023
  21. 21
    SmartAsset· New York, New York, United States
    • Secondary
    • 278 employees
    • Founded 2012
  22. 22
    HireArt· New York, New York, United States
    • Series B
    • 265 employees
    • Founded 2012
  23. 23
    Tennr· New York, New York, United States
    • Series C
    • 261 employees
    • Founded 2021
  24. 24
    SQUIRE· New York, New York, United States
    • Debt
    • 233 employees
    • Founded 2015
  25. 25
    The Muse· New York, New York, United States
    • Series unknown
    • 231 employees
    • Founded 2011

Y Combinator portfolio companies in New York

Y Combinator’s New York portfolio is one of the most active recruiting pools in the market. The list above ranks Y Combinator-backed companies headquartered in New York by current headcount, drawn from public LinkedIn and Crunchbase records. With 344 matching companies in our index, you can see exactly where the Y Combinator thesis has landed locally.

Y Combinator companies in New Yorktend 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 New Yorkhiring founding engineers” or “founders of Y Combinator-backed companies in New York 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 New York, 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 06:56:52 GMT

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