Today startup incubator Y Combinator posted stats about their portfolio, which now spans 716 companies (including 85 in the current batch) who have raised more than $3 Billion in collective funding. At the end of the post YC President Sam Altman noted:
While YC doesn’t track these things, we do. I’ve taken a look at the data we have on YC companies and here’s what I found:
- 267 companies currently have 2 or more employees
- 8,164 people are currently employed by a YC company 
- 121 companies have disclosed an exit (no IPOs, all acquisitions so far)
- 66% of YC companies are based in the Bay Area, followed by New York (7%) and Boston (2%)
- 76 un-exited companies have raised a venture round of funding (Series A or beyond)
- There is a nearly 50/50 split between B2B and B2C startups in the portfolio
- The average Series A stage YC company has 26 employees and has raised $10.2M of funding in its lifetime (median is $7.3M)
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 The total number is probably much higher, many of these companies do not have LinkedIn pages or employees on LinkedIn, Crunchbase, news, and other sources until they are further along. I think an estimate of 9,000 to 10,000 current jobs created by current YC companies is reasonable.