ITV's stock price fell by more than 5% on early trading Tuesday as U.K. regulators failed to lift restrictions on how much it can charge advertisers.

The U.K. TV giant posted a 1 percent ad revenue gain for the first nine months of 2013 and 11 percent growth for its ITV Studios content arm.

ITV 2014 Earnings Rise, Production Arm Continues to Grow CEO Adam Crozier touts ad growth and discusses shareholder Liberty Global and potential further acquisitions of production businesses, such ...

The company, led by CEO Adam Crozier, says ITV America revenue dropped 27 percent last year and ad revenue will be down 6 percent in the first four months of 2017 amid "economic uncertainty.