Near continuous use of mobile devices is certainly a concern for C-level employees, but do not take security awareness for granted.  Though individuals in these high ranking positions should be more aware than most of the cyber risks they face, they may not leverage that knowledge and take the right steps to protect themselves.  Continue to educate all employees including your C-suite.  Use that time honored adage from the back of your shampoo bottle – Train / rinse / repeat!

https://www.infosecurity-magazine.com/news/c-level-provides-biggest-mobile/