Ask HN: What are the new YC startups that are doing well?

Now that Dropbox has gone public, and Airbnb is a billion dollar company, and Weebly has sold, what are the next wave of YC startups?

The last group of YC startups that was well-known was in Sam Altman's 2015 bet: Stripe, Zenefits, Instacart, Mixpanel, Teespring, Optimizely, Coinbase, Docker, and Weebly.

Who are next?