Y Combinator key facts
- Y Combinator is a other based in Mountain View, California with 1506 tracked portfolio companies.
- Notable positions include OpenAI, Stripe, Kalshi.
- PrivateMarketView records 34 deal participations by Y Combinator.
- Y Combinator’s most recent recorded investment was in Mar 2026, one of 1 in the last 12 months.
- Y Combinator has 6 funds on record, raising $381.0M across the 2 that report a size.
- The team roster lists 31 people.
About Y Combinator
Founded in 2005, Y Combinator is an accelerator/incubator based in Mountain View, California. The firm seeks to provide resources and investments to startups operating in the business-to-business software and services, education, consumer, healthcare, real estate and construction, financial technology, industrials, and government sectors.
Investment activity
Y Combinator joined 8 recorded rounds in the last two years (6 in the last 12 months), up from 1 in the two years before. By year: 6 in 2026, 2 in 2025 and 1 in 2023. Across all 34 recorded rounds, 15 were seed, 11 were later-stage and 7 were early-stage. Y Combinator is recorded as lead on 3 of them. 5 rounds landed in the last 90 days. Y Combinator most often invests alongside Founders Fund (7 shared rounds), Initialized Capital (6 shared rounds) and FundersClub (4 shared rounds). Most recently: Numeral Two (Series C, Sep 2026) and Hubble Network (Series C, Sep 2026).
Y Combinator portfolio at a glance
Y Combinator funds
6 funds are on record for Y Combinator, totalling $381 million across the 2 that report a size. The most recent is Y Combinator ES26, LLC (2026 vintage), $228 million.
Y Combinator team
31 people are on record at Y Combinator: 29 partners, 1 associate and 1 other. Senior names include Aaron Epstein (Group Partner), Aaron Harris (Partner) and Ali Rowghani (Partner). 14 of them have a verified direct contact on file.
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- ·The top 10 names in the book — of 1506 recorded positions
- ·The 10 latest deals — of 34 rounds
- ·Watchlist + alerts for Y Combinator's activity
Portfolio
1506 companies · priced for members| Company | Industry | Valuation | First invested | Role |
|---|---|---|---|---|
| OpenAI | Software Development Applications | ▮ | ▮ | ▮ |
| Stripe | Other Financial Services | ▮ | ▮ | ▮ |
| Kalshi | Other Financial Services | ▮ | ▮ | ▮ |
+ 1,503 more companies · all 1,506, priced and dated or a free account shows the top 10 names — no card Membership and data by Private Market View | ||||
Y Combinator recent deals
34 recordedMembership and data by Private Market View
Funds
6 recorded- Y Combinator Fund II (Y Combinator)—
- Y Combinator ES26, LLC2026$228.3M
- Y Combinator ES24, LLC2024$152.7M
- Y Combinator ES20, LLC2020—
- Y Combinator Continuity Affiliates Fund I, L.P.2016—
- Y COMBINATOR CONTINUITY FUND I, L.P.2015—
$381.0M raised across the 2 funds that report a size
Partners, principals, and the people who answer a pitch. Pro members reveal contacts with credits.
Frequently asked about Y Combinator
- What companies does Y Combinator invest in?
- Y Combinator has 1506 recorded portfolio companies, including OpenAI, Stripe, Kalshi.
- What is Y Combinator's AUM?
- Y Combinator manages approximately $3.2B in assets.
- Is Y Combinator actively investing?
- Y Combinator's most recent recorded investment was in Mar 2026, with 1 investments in the last 12 months.