AI Buying Platforms Will Run 27% of US Ad Spend by 2030, Forecast Says
A new Madison & Wall forecast projects that AI-driven buying platforms will control 27% of US ad spend - roughly $158bn - by 2030, up from about $60bn today, as global ad revenue tops $1.3tn in 2026.
The Forecast
Madison & Wall projects that AI buying platforms - Google's Performance Max, Meta's Advantage+ and their peers - will handle around 27% of US ad spend by 2030, roughly $158bn, up from about $60bn today. It also pegs 2026 global ad revenue at $1.3tn, an 11% year-on-year rise, with Q2 2026 up 12.9%.
The report describes the growth as 'unusually rapid' and frames AI as supporting rather than disrupting an already-concentrating market, with spend flowing toward the largest platforms.
Why It Matters
The number to sit with is this: within four years, roughly a quarter of US ad dollars will not be steered by a human media buyer at all. Optimisation, targeting and allocation increasingly happen inside black-box automated systems.
That concentrates power with a handful of platforms and changes the media buyer's job from pulling levers to setting inputs - budgets, goals, creative and data - and then trusting, or auditing, the machine.
Marketing Minute's Take
Automation is not optional, but abdication is a mistake. The advertisers who win with AI buying platforms are the ones who feed them the best inputs: clean first-party data, sharp objectives, and strong, varied creative. Garbage in still means garbage out, only faster.
Our practical checklist: protect and grow your first-party data, keep creative as your biggest controllable lever, and insist on enough transparency to know why the black box is spending your money the way it is. Treat these platforms as powerful employees, not autopilot.
Quick FAQ
How much US ad spend will AI control by 2030?
Madison & Wall forecasts AI buying platforms will handle about 27% of US ad spend - roughly $158bn - by 2030, up from around $60bn today.
How big is the global ad market in 2026?
The forecast pegs 2026 global ad revenue at $1.3tn, up about 11% year on year, with the second quarter of 2026 growing 12.9%.
How should marketers respond to AI ad buying?
Feed the platforms clean first-party data, sharp objectives and strong creative, and demand enough transparency to audit how they spend - automate, but do not abdicate.
Within four years, a quarter of US ad dollars won't pass through a human's hands. That is not a reason to switch off your brain - it is a reason to obsess over your inputs. Clean data and great creative are the levers the machine cannot pull for you. - Daniel Nikolla, Founder of Merx Marketing
By 2030 roughly a quarter of US ad spend will be steered by AI, not humans - win by feeding the machine better inputs, not by abdicating to it.
If a black box spends a quarter of your budget, do you have the data and transparency to know it is spending it well?
If you would like to know more about this topic, please contact us on danieln@merxmarketing.co.uk
Sources: Adweek, Digiday, AdExchanger.
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Written by Daniel Nikolla, Founder of Merx Marketing Ltd and Marketing Minute
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