Y Combinator Accelerator Program

Y Combinator Accelerator Program

Runs Y Combinator Accelerator for early-stage startups with a three-month batch, investment, and mentoring support.

Y Combinator is a Silicon Valley startup accelerator that has been running since 2005 and has funded companies including Airbnb, Stripe, Dropbox, and Reddit. The program runs four times per year in winter, spring, summer, and fall batches, each lasting three months and based in San Francisco. YC's investment model delivers $500,000 to every accepted company: $125,000 via a post-money SAFE that converts into 7% of the company's equity, plus an additional $375,000 via an uncapped SAFE with a Most Favored Nation provision, converting at the most favorable terms offered to any investor during the batch period.

YC accepts early-stage startups incorporated in the United States, Canada, the Cayman Islands, or Singapore; companies formed elsewhere must restructure into one of those four jurisdictions before funding closes. The program is sector-agnostic and accepts for-profit companies only — nonprofits, universities, and research organizations are ineligible. No milestone requirements are attached to the investment, no fees are charged to portfolio companies, and YC does not take enhanced returns in downside exit scenarios. Each batch opens a competitive application window with a published on-time deadline; for Summer 2026 that deadline was May 4, 2026, with interviews held in May and June and the program running July through September.

The three-month batch includes a three-day in-person kickoff, weekly one-on-one and group office hours with a dedicated General Partner, alumni speaker sessions, and structured preparation for Demo Day — the program's closing event where founders pitch to a curated audience of investors. Acceptance rates are highly competitive, historically below 2% of applicants. Post-batch, portfolio companies retain access to YC's alumni network of more than 6,000 founders, continued office hours, and pro-rata rights to participate in subsequent financing rounds. Because the $500,000 is dilutive equity capital delivered via SAFE instruments — not a grant — this program falls outside the scope of non-dilutive public and philanthropic funding programs.