Digital video ad spend in the US grew by 42% over the past year, totaling $7.46 billion in 2015. Within the next four years, that number is expected to nearly double, reaching $13 billion by 2019. According to AOL’s state of the video industry report, 91% of brands and agencies are buying video programmatically and continue to make larger investments in the technology year on year. Some 88% of publishers claim they sell their video inventory programmatically, a noticeable 37% leap from 2014. Furthermore, Advertisers and agencies devote over 30% of their overall video budgets to branded video content. Brands intend to grow these investments 10% in the next year. US satellite radio company SiriusXM has reported yet another record…