Y Combinator

Accelerator · San Francisco

Y Combinator is a startup accelerator that invests in a wide range of startups twice a year.

About

Founded in 2005 and based in San Francisco, Y Combinator operates as a startup accelerator investing in a wide variety of companies twice a year. Its work spans companies from the seed stage through Series A and Series B and beyond. Rather than limiting attention to a single vertical, it works across multiple sectors including artificial intelligence, machine learning, SaaS, fintech, healthtech, and biotech.

What they run

The organisation has held seven gatherings across the Bay Area, Lausanne, and Lansing, consisting of demo days, conferences, and general events. Its recurring programming includes the YC Demo series. Looking forward, the schedule includes startup-school-taipei taking place in November 2026, followed by the YC Fall 2026 Demo Day hosted in San Francisco in December 2026.

Who attends

The rooms bring together early-stage founders seeking initial momentum alongside scale-ups operating through Series A and later stages. Given the accelerator format and recurring demo days, audiences typically feature active venture capital investors, angel backers, and operators looking to evaluate new ventures. Participants represent broad technological fields, drawing practitioners from SaaS, fintech, machine learning, healthtech, and biotechnology ventures.

https://www.ycombinator.com

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