Marcio Jose Sanchez/AP Glassdoor's annual 100 Highest-Rated CEOs report reveals both Apple's Tim Cook and Google's Sundar Pichai dropped heavily in the rankings, which are determined by anonymous employee feedback. Cook, in particular ,dropped 43 spots from his place in last year's report, distinguishing himself as the tech CEO with the biggest dip in rankings. A Glassdoor spokesperson told Business Insider that employees cited Apple's culture of secrecy and high stress for Cook's drop... ...and Google's growing corporate and bureaucratic work culture as the reasons behind the negative feedback for Pichai. The past year hasn't been smooth sailing for the tech industry. On Tuesday, Glassdoor released its annual 100 Highest Rated CEOs report, showing that CEO Mark Zuckerberg dropped six spots in the rankings.