martin sorrellOne-third of WPP shareholders voted against CEO Martin Sorrell's $102M compensation package, a symbolic pushback against the marketing conglomerate's founder and chief.

Investors representing 33.5% of WPP voted against the pay package, although the tally was non-binding on the company. Next year the shareholder vote will be binding.

The BBC noted Sorrel's pay for 2015 is one of the largest such packages in UK corporate history.

Reuters notes WPP's annual meeting and the vote come amid a "resurgence of investor activism against excessive boardroom pay."

Sorrell has defended his pay in the past, citing the company's performance atop the ad realm.