I found it hard to find good numbers, so hopefully this research will be of use to other people: Yesterday, Uber co-founder Garrett Camp wrote "Uber has become

I found it hard to find good numbers, so hopefully this research will be of use to other people: Yesterday, Uber co-founder Garrett Camp wrote "Uber has become a global service providing roughly 15 million rides per day across 500 cities" at https://medium.com/@gc/ubers-path-forward-b59ec9bd4ef6 https://medium.com/@gc/ubers-path-forward-b59ec9bd4ef6 The most recent estimate I could find on Didi Chuxing is 20 million rides per day as of October, 2016 as stated at https://www.techinasia.com/china-didi-chuxing-20-million-daily-rides https://www.techinasia.com/china-didi-chuxing-20-million-dai... It's reasonable to assume that Didi has noticeably grown since October 2016, but none of these numbers are easily verifiable externally to these companies. (Lyft's market share is unclear to me, but perhaps 2 million rides per day, more or less?)