As subscriber growth cools, streaming platforms are leaning into ad-supported tiers to lure cost-conscious consumers. Forrester expects that in 2022, over-the-top (OTT) video platform advertising spend will reach over $15 billion in the US, up 38% from 2021. At the same time, OTT advertising offers marketers the ability to reach audiences on premium video content with more targeting capabilities than traditional linear TV. As a result, OTT advertising will more than double in the next four years, reaching $32.4 billion by 2026. This report presents our US OTT video advertising forecast for 2022 to 2027.