Semrush, acquired by Adobe this year for $1.874 billion, published the first United Kingdom edition of its 2026 A.I. Visibility Index on Tuesday at a Spotlight event in London, and the headline number buried inside it reframes a year of marketing debate: fewer than half of the top-100 brands mentioned by chatbots also appear among the top-100 domains those same chatbots cite as sources. Being talked about by an A.I. and being linked to by an A.I. are, it turns out, two different businesses.

The study, announced via BusinessWire, draws on monthly pools of 2.5 million British and 25 million American prompts from January through July 2026, across four platforms: ChatGPT, Gemini, Google A.I. Mode, and Google A.I. Overviews. In Britain, the overlap between the top-100 mentioned brands and top-100 cited domains ranged from 36.7 to 45.3 in any given month, across 22 categories. The gap is the point.

Tesco and Asda make the abstraction concrete. Both sit comfortably among ChatGPT’s most-mentioned British brands. In July, Tesco ranked 25th as a cited domain; Asda ranked 606th. On Gemini, the spread narrowed to 29th and 60th. Same brand recognition, radically different referral economics.

That economics is where Adobe’s analytics do real work. Visitors arriving from an A.I. answer convert 60 percent better and generate 53 percent more revenue per visit than other web traffic, according to figures The Next Web attributes to Adobe inside the study. For a small business whose discovery used to run through blue links, the citation layer isn’t a vanity metric. It’s the funnel.

Britain’s A.I. ecosystem also looks more fragmented than America’s. Any two of the four platforms share only 63 to 70 top-100 mentioned brands in the U.K., versus 70 to 78 in the U.S. ChatGPT leans harder on news publishers in Britain too, pulling 29.5 percent of its top-100 source domains from them, against 19.6 percent in the U.S.

The report is careful about its own limits. TECHi notes it measures recurrence rather than growth and can’t prove a visibility change produces a sale. The Index itself concedes it “does not isolate platform changes from collection differences.”

That caveat matters, but it doesn’t rescue the brands sitting at 606. The old SEO playbook assumed being known was the hard part and being clicked would follow. The citation data suggests the sequence has inverted. Mentions are now the easy half.

Sources