US podcasting market size was $314M in 2017

According to an IAB/PwC report, the market size for podcast advertising in the US was $314M in 2017, an incredible 86% yoy increase from $169M in 2016. It predicts the market will reach $659M in 2020.

One stat of note: 38% of podcast ad spend in 2017 was via annual upfront buys (compared to 27% in 2016).