[2arrs2ells]

The database maintained by YC is going to be a lot more accurate: https://www.ycombinator.com/companies/?batch=S11&status=Acti...

For S11, 21 companies are still active, with 5 (GoCardless, Segment, Zeus, Vidyard, and Sift) in the "YC Top 100" (valued at $150mm or more). At least one (Segment) is valued at $1bn+.