AI search ads to surge from $301M to 39% of search revenue by 2031: WPP

The advertising landscape is on the brink of its next tectonic shift—and this time, the budget is coming out of paid search and e-commerce. WPP’s new forecast paints a picture that no marketer can ignore: AI search ads, barely a blip on the radar today, will command nearly 40% of all search dollars by 2031. With ChatGPT already selling ads in the U.S. and UK, the race is on to understand this new channel before the early-bird advantage disappears.

WPP, one of the world's largest advertising holding companies, has published its latest ad spend forecasts, and for the first time the report includes a dedicated estimate for AI search advertising. The numbers are striking: AI search ads, driven by the likes of ChatGPT and Google's AI Overviews, will grow from a modest $301 million in 2026—just 1.9% of total search ad revenue—to capture 39.2% of search revenue by 2031. That's a compound annual growth rate that makes AI search the fastest growing channel in advertising, potentially reaching $100 billion in global revenue by the end of this decade. WPP’s projection, while more conservative than OpenAI's own $100 billion by 2030 target, signals that the advertising industry is on the cusp of a seismic shift.

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The numbers are striking: AI search ads, driven by the likes of ChatGPT and Google's AI Overviews, will grow from a modest $301 million in 2026—just 1.9% of total search ad revenue—to capture 39.2% of search revenue by 2031.

The forecast, published on June 16, 2026, comes less than six months after ChatGPT first began running ads, and only two weeks after its UK launch. The rapid embrace of AI search platforms by consumers has outpaced advertiser tools, creating a mix of excitement and uncertainty. Advertisers are eager to reach users who are increasingly turning to generative AI for answers, but the current ad infrastructure is immature. Google, for instance, doesn't allow brands to specifically buy placements adjacent to AI Overviews or exclude them, forcing marketers into a black box of algorithmic delivery. Kate Scott-Dawkins, WPP Media’s global president of business intelligence, acknowledged that the forecast is "an exercise in modelling an abstraction of reality," but stressed it provides a crucial baseline for planning.

The geographic distribution of spend underscores the early lead of the U.S., which accounts for 60% of global AI search ad revenue. As more markets gain access to ad-supported generative search experiences, that concentration should dilute, but the U.S. advantage in tech innovation and advertiser sophistication may persist. The implications for legacy search and commerce budgets are profound. Scott-Dawkins noted that AI search will not only draw from traditional search dollars but also decelerate growth in e-commerce advertising, as consumers might bypass product listing ads in favor of AI-summarized purchase recommendations.