http://www.theregister.co.uk/2016/03/18/pwn2own/

So, the hacking contest's final tally: Microsoft Windows was exploited six times, Apple's OS X five, Adobe Flash four, Apple Safari three, Microsoft Edge twice, and one for Google Chrome (although this attack was a duplicate of an independently reported vulnerability).

http://tweakers.net/nieuws/109425/hackers-demonstreren-kwetsbaarheden-in-chrome-en-safari-op-eerste-dag-pwn2own.html