Y Combinator (company)
|Type||Limited liability company|
|Headquarters||Mountain View, California|
|Key people||Paul Graham, Trevor Blackwell, Paul Buchheit, Jessica Livingston, Robert Morris, Harj Taggar|
Y Combinator is an American seed accelerator, started in March 2005. Y Combinator provides seed money, advice, and connections at two 3-month programs per year. In exchange, they take an average of about 6% of the company's equity. As of 2013, Y Combinator has funded over 500 companies in over 30 different markets.
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The program consists of weekly dinners where guests come to speak to the founders.  The dinners last for the duration of the three-month program, but all founders have the lifelong ability to book office hours with the Y Combinator venture partners.
Compared to other startup funds, Y Combinator itself provides very little money ($14,000 for startups with 1 founder, $17,000 for startups with 2 founders, and $20,000 for those with 3 or more). Prior to the Winter 2013 class, Yuri Milner and SV Angel offered every Y Combinator company a $150,000 convertible note investment through the Start Fund. Starting with the Winter 2013 the Start Fund has been replaced by "YC VC", a similarly structured $80k from Andreesen Horowitz, Yuri Milner and others. This reflects co-founder Paul Graham's theory that between free software, dynamic languages, the web, and Moore's Law, the cost of founding an information technology startup has greatly decreased. Wired has called Y Combinator a "boot camp for startups" and "the most prestigious program for budding digital entrepreneurs".
From its inception to 2008, one program was held in each of the US cities of Cambridge, Massachusetts, and Mountain View, California; in January 2009, Y Combinator announced that henceforth the Cambridge program would be closed and all future programs would take place in Silicon Valley.
Starting in 2011, Yuri Milner and SV Angel offer every Y Combinator company a $150,000 convertible note investment. The amount put in to each company was changed to $80,000 when Start Fund was renewed. 
Late that year, in response to widespread support for the Stop Online Piracy Act (SOPA) pending in the U.S. Congress, Graham announced that no representative of any company supporting it would be welcome at Y Combinator's Demo Days, and urged startups the company was already supporting to boycott SOPA supporters as well.
Y Combinator was founded in March 2005 by Paul Graham with his Viaweb co-founders Robert Morris and Trevor Blackwell, as well as Jessica Livingston. In early 2010, Harj Taggar, cofounder of Y Combinator-funded Auctomatic, joined as an advisor. In September 2010, Alexis Ohanian, co-founder of Y Combinator-backed Reddit, joined. In November 2010, Gmail creator Paul Buchheit and Harj Taggar were named partners. In January 2011, Y Combinator-backed Posterous co-founder Garry Tan joined as designer-in-residence.
Notable portfolio companies 
As of June 2011, Y Combinator had funded 316 startups. The number of startups funded in each cycle has been gradually increasing. The first cycle, in summer 2005, had eight startups. In the summer 2012 cycle, there were more than 80. Y Combinator has since reduced their class size down to less than 50 with their winter 2013 batch, but expect to grow it again.
See also 
- "Running a Hatchery for Replicant Hackers". New York Times. 2006-02-21. Retrieved 2008-08-27.
- "Y Combinator Companies - Y Combinator Universe". Retrieved 23 February 2013.
- Graham, Paul. "What happens at YC". Retrieved 8 May 2013.
- "Y Combinator Frequently Asked Questions".
- "Start Fund and SV Angel Invest $9 million in new Y Combinator Startups". TechCrunch. 2011-08-01. Retrieved 2011-08-02.
- "Planning for a Crush of Startups". BusinessWeek. Retrieved 2008-08-27.
- Levy, Steven (2011-05-17). "Y Combinator Is Boot Camp for Startups". Wired. Retrieved 2011-06-24.
- [http://www.ycombinator.com/faq.html Y Combinator FAQ "Why did you choose the name "Y Combinator?" The Y combinator is one of the coolest ideas in computer science. It's also a metaphor for what we do. It's a program that runs programs; we're a company that helps start companies.
- "How Y Combinator Thinks About Growth". GrowHack. Retrieved 2012-09-25.
- "Top Startup Incubators And Accelerators: Y Combinator Tops With $7.8 Billion In Value". Forbes. 2012-04-30. Retrieved 2012-12-06.
- "California Year-Round". Y Combinator. Retrieved 2009-01-29.
- "Y Combinator Gets The Sequoia Capital Seal Of Approval". TechCrunch. 2009-05-16. Retrieved 2011-02-10.
- Rao, Leena Rao. "Y Combinator’s YC VC Will Replace The Start Fund; Includes Yuri Milner, Andreessen Horowitz But Offers Less Money".
- Tsotsis, Alex (December 22, 2011). "Paul Graham: SOPA Supporting Companies No Longer Allowed At YC Demo Day". TechCrunch. Retrieved December 23, 2011.
- Wednesday, September 1st, 2010 (2010-09-01). "Reddit Cofounder Alexis Ohanian To Join Y Combinator". TechCrunch. Retrieved 2012-02-28.
- Graham, Paul (2010-11-12). "Y Combinator announces two new partners, Paul Buchheit and Harj Taggar". Y Combinator Posterous. Retrieved 2012-02-28.
- Melanson, Mike (2011-01-14). "Posterous Co-Founder Garry Tan Leaves for Y Combinator". Readwriteweb.com. Retrieved 2012-02-28.
- "Y Combinator Brings On Alumni To Be "Part Time Partners"".
- "Seed Stage Accelerator companies".
- Official website
- Y Combinator Universe - Collection of information about Y Combinator and Y Combinator-funded companies.
- The Future of Venture Capital and High-Tech Entrepreneurship - Talk given at Stanford University by Paul Buchheit from Ycombinator. (video archive)