The news: Spotify’s ad revenues jumped 75% year over year (YoY) in Q3 to €323 million ($368.3 million), the company reported in its earnings on Wednesday.

• Ad revenues have typically made up around 10% of Spotify’s total revenues.
• This quarter’s growth brings advertising's share of total revenues to an all-time high of 13%.

Key stats: The audio giant now expects its total 2021 ad revenues to hit €1 billion ($1.16 billion) for the first time.

• That’s in line with our own forecasts, which estimate Spotify will hit $1.25 billion in worldwide ad revenues this year—up 46.6% from 2020.

What this means: Spotify’s massive investments in podcasting are largely responsible for this boom.

• Advertisers’ hunger for podcast ads has grown rapidly—in part due to strong growth in listenership, but also because podcast listeners tend to be highly engaged and more receptive to a brand’s message.
• To meet this growing demand, Spotify has rolled out new streaming ad insertion tech, expanded its self-serve Ad Studio, and launched Spotify Audience Network, an ad marketplace for its original and exclusive content—all in the past year alone.
• That’s in addition to the hundreds of millions it has spent securing exclusive rights to popular podcasts, like "The Joe Rogan Experience," and inking deals with Kim Kardashian and Michelle Obama.
• We expect podcast ad spending in the US to hit $1.31 billion this year, up 51.3% from 2020. Considering Spotify now captures more of the podcast market, and that Apple only allows for baked-in, host-read ads on podcasts, Spotify is responsible for the lion’s share of that growth.

What’s next? Per our forecasts, podcast listeners will keep rising steadily, and Spotify’s share of those listeners will keep pace.

• As those metrics grow, so too will Spotify’s ad revenues: CEO Daniel Ek said he expects ads to make up at least a fifth (20%) of Spotify’s revenues soon, rising to 30% or even 40% over the next 10 years.
• Given the success of its podcasting strategy so far, advertisers can expect Spotify’s investments in new podcast ad products to keep rising. For example, we wrote just last week about Spotify’s expansion into video podcasting, theorizing that video podcast ads will follow very soon.