WPP Sees AI Search Advertising Hitting $100 Billion by 2030

WPP’s midyear ad spend forecast, published on June 16, 2026, crowns AI search advertising as the fastest growing investment area in advertising. The agency expects the category to grow from 1.9% of search ad revenue this year to 39.2% by 2031, and to top $100 billion in global revenue by 2030, faster than any other channel in media. WPP also lifted its 2026 forecast for total ad revenue, with generative search ad revenue alone reaching $5.1 billion this year, a sliver of the market that the firm expects to multiply roughly twentyfold before the decade ends.

ChatGPT has been running ads for less than six months. OpenAI’s US pilot launched on February 9, 2026, and the UK went live on June 6, 2026, making Britain the first European market. In that window, the channel has gone from a curiosity to the line item media agencies now plan against, and the forecasts landing this week try to size how far the run can go.

From a 1.9% Sliver to 39.2% of Search Spend

WPP’s midyear report is the first edition of its long running This Year Next Year forecast to break out AI search as a separate line. Generative search ad revenue is projected to reach $5.1 billion globally in 2026, roughly 0.4% of total advertising revenue, and to grow at a compound annual growth rate of nearly 100% over the next five years. By 2030, the firm expects the channel to exceed $100 billion, and by 2031 to account for 39.2% of the search advertising market.

That trajectory is faster than retail media, social, traditional search, streaming TV, or gaming on the path to $100 billion, according to the report. WPP’s projection that generative search tops $100B by 2030 is more conservative than OpenAI’s own forecast, which has the company pulling in $2.5 billion in ad revenue this year and reaching $100 billion by 2030 as well. WPP Media’s global president of business intelligence, Kate Scott-Dawkins, said advertisers are likely to transfer both traditional search spending and e-commerce budgets into generative AI ad options. The category, in her view, could capture a larger share of incremental growth than any other channel, in part because it is new and because some of the spend will come at the expense of commerce budgets, which WPP expects to decelerate as AI agents intercept more buying decisions.

The report flags a more granular risk that brands already know about. There is currently no way for brands to buy only ad space adjacent to AI Overviews on Google, or to exclude the format, so any dollar moved into the channel still flows through Google’s traditional search auction. That is one reason WPP’s $100 billion figure carries a hedge.

The Forecast at a Glance

• 1.9%: AI search’s share of global search ad revenue in 2026
• $301 million: AI search ad revenue in 2026, per WPP
• 39.2%: AI search’s projected share of search ad revenue by 2031
• $5.1 billion: WPP’s 2026 forecast for generative search ad revenue globally
• $100 billion: the figure WPP expects the channel to reach by 2030

What $5.1 Billion Actually Buys in 2026

For all the noise, generative search is still a rounding error on the 2026 books. WPP sizes the 2026 global ad market at well over $1 trillion, which makes $5.1 billion equal to 0.4% of total revenue. The bigger picture is that traditional and generative search combined will reach $139.7 billion this year, up 12.6%, while commerce media reaches $72.2 billion, up 17.7%. The US ad market alone is forecast to hit $483.4 billion, up 11.9% excluding political spending.

Streaming is set to surpass linear for the first time, with streaming ad revenue at $27.6 billion (up 21.5%) and linear contracting by 8.6% to $41 billion. Social and other digital will reach $161.4 billion (up 16.3%), driven by AI-led delivery, short-form video and creator-led distribution. Out of home grows 5.7% to $9.6 billion. The full WPP channel by channel 2026 forecast breakdown shows how the categories stack up against each other, and how much weight the AI search line still has to carry to justify its $100 billion endpoint.

2026 Ad Revenue by Channel

Brands Want the Real Estate

Media agency buyers are not waiting for the forecast to settle. Madison & Wall’s separate June 16 forecast puts total global search revenue at $298 billion this year, with search contributing 9.3% of the growth in global ad revenue and ranking as the third fastest growing channel behind social and commerce.

The US currently accounts for 60% of global AI ad spend, but that share is starting to shift. ChatGPT ads have been live in the UK for a fortnight as of the WPP report, with Zalando and Dentsu client campaigns among the first placements. The Sam Bradley report on the WPP midyear forecast notes that OpenAI and Google are bringing ad-supported AI experiences to more markets, and investment is expected to pick up as consumer adoption follows.

Performance agency Roast sees the demand coming from a land grab as much as a return-on-investment case. John Barham, managing partner at Roast, said advertisers are staking a claim in new digital real estate before rivals do, and finding incremental revenue along the way.

Appetite for paid advertising in the generative search space is certainly there. Brands are as equally keen to stake a claim in new digital real estate before their competitors do as they are to find sources of incremental revenue.

Andy Arnett, head of search at Incubeta, a media agency running live campaign tests on ChatGPT, said the appeal for advertisers is context. AI search can read more than a keyword query, picking up the conversation, the user’s intent, the decision criteria, and over time, broader personal agent signals. That should make each impression more valuable, because ads can be more relevant, more useful, and closer to the point of decision.

A Race Built on Variables WPP Itself Cannot See

WPP’s own forecaster is candid about how much of the model is guesswork. The biggest unknown is Google. There is currently no way for brands to buy only ad space adjacent to AI Overviews, or to exclude the format, so any dollar moved into the channel still flows through Google’s traditional search auction. Scott-Dawkins called the modelling exercise an abstraction of reality, and a good line in the sand.

OpenAI’s projections look more aggressive. The OpenAI $100B by 2030 ad revenue projection, reported by Axios in April, sketched a curve from $2.5 billion in 2026 to $11 billion in 2027, $25 billion in 2028, and $53 billion in 2029. That trajectory assumes OpenAI’s products reach 2.75 billion weekly users by 2030 and capture share from Google, Meta, Amazon, and TikTok. The pilot had crossed $100 million in annual recurring revenue within six weeks of the February 9 US launch, the company told investors.

Madison & Wall Sees a Different Curve

The headline numbers from WPP and Madison & Wall are close. WPP pegs 2026 global ad revenue growth at 8.9%, Madison & Wall at 8.3%. Neither registered a significant downturn tied to geopolitical concerns.

The two diverge sharply on the slope of the rest of the decade. Madison & Wall projects annual growth slowing to 5% by 2028, down from an estimated 10% in 2025. Luke Stillman, managing director at Madison & Wall, said the firm expects the whole market to slow as key channels mature, and that it is still surprising that every marketer is just ignoring all the potential headwinds out there and spending. The consultancy estimates that spending on television, audio, direct mail, and publishing will all decline this year.

TV is already bending to that curve. Madison & Wall’s separate 2026 ad spend forecast has total US TV ad revenue slipping 2.4% this year, with digital TV growth slowing to a 3% increase from 12% in 2025. Linear ad spending is contracting by 8.6% to $41 billion. Generative search is the channel going the other way.

The Model Has Its Limits

WPP’s report frames AI search as the engine financing the transition rather than a beneficiary of it. The companies at the center of the AI race are not, primarily, traditional media owners. They are digital services providers offering search, communication, commerce, entertainment, and increasingly AI-powered assistance to billions of consumers, subsidized in large part by advertising. The advertising industry is not merely observing the AI transition, the report argues, it is financing it.

Arnett, the Incubeta search lead, warned that generative AI search spending is not guaranteed to grow, especially once marketers get used to the new car smell. A major scandal around unsafe AI answers would slow spend quickly, he said. For OpenAI in particular, the challenge is proving that advertisers can track, optimize, and scale performance without compromising brand safety or user trust. The Pacvue Pacvue integration as the first third party route into ChatGPT ads is one attempt to solve that problem, with Kepler running live campaigns for more than ten brands through the same console enterprise teams already use for Amazon and Walmart budgets.

Frequently Asked Questions

What share of search ad revenue will AI search advertising capture by 2031?

WPP forecasts AI search advertising at 39.2% of total search ad revenue by 2031, up from 1.9% in 2026. The category is set to grow at a compound annual growth rate of nearly 100% over the five year window, per the firm’s midyear report.

How much will generative search advertising generate in 2026?

WPP sizes 2026 generative search ad revenue at $5.1 billion globally, equal to roughly 0.4% of total advertising revenue. The channel is small relative to social, search, and commerce media, but growing far faster than any of them.

How do WPP and Madison & Wall 2026 ad growth forecasts differ?

WPP projects 2026 global ad revenue growth at 8.9%, Madison & Wall at 8.3%. The bigger gap is forward. Madison & Wall sees growth slowing to 5% by 2028, down from 10% in 2025, as channels mature.

What could slow AI search advertising growth?

WPP’s forecaster flagged the dependence on Google, where there is no way to buy only ad space adjacent to AI Overviews. Buyers cited brand safety, the absence of mature measurement, and the risk of a high profile scandal around unsafe AI answers as the obvious brakes on spending.