In the first paragraph they say it's by valuation... ;) > The top 100 YC companies are listed by valuation (including the top 12 exits), as of October 16, 2018

In the first paragraph they say it's by valuation... ;) > The top 100 YC companies are listed by valuation (including the top 12 exits), as of October 16, 2018. I find it quite interesting seeing several founder names repeated for a number of the Top 100 companies.