The recent performance of ad tech stock prices underline the key issues in programmatic: viewability and header bidding

Despite revenues rising 22 per cent year-on-year to hit $54.4m in the second quarter, TubeMogul missed its forecast for the period with the video ad tech outfit’s stock price dropping by almost a quarter in the immediate aftermath of the announcement, showing just how tough a time ad tech is having on Wall Street.
Again, one of the key culprits here was mobile, similar to how header bidding was the undoing of fellow ad tech outfit Rubicon Project (more on this later), with TubeMogul subseq