Every year, Glassdoor interviews employees of large American companies to compile a ranking with the highest rated CEOs.
From 2014 to c, Tim Cook (Apple) rose from 17 to 10 position now with an approval of 94% of respondents.

Who topped the 2015 ranking was Larry Page, Google CEO, with 97% approval; in 2014, he was in the 10th position. Mark Zuckerberg, from Facebook, also rose: from 9 to 4 this year, with 95%.
(via GeekWire)