Silicon Valley’s Y Combinator to Double Number of Cohorts Per Year

The startup accelerator now will accept four smaller groups of startups instead of two larger ones. 

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Y Combinator, the startup-building school that has launched businesses ranging from Airbnb Inc. to Stripe Inc., is expanding to four cohorts a year from two — meaning that the accelerator will be in session almost the entire year.

Spring and fall cohorts are joining the traditional winter and summer cohorts, President Garry Tan confirmed in a message. The program lasts about 11 weeks, each capped with an investor “Demo Day” when the startups pitch top venture capital firms.