Alphabet Stock Tumbles 13% as AI Costs Cannibalise Google Search Revenue

Alphabet, Google's parent company, saw its shares plunge roughly 13 percent — their steepest single-day drop on record — after third-quarter 2026 results badly missed Wall Street expectations. The company reported adjusted earnings per share of $2.67 against a forecast of $3.02, and generated negative free cash flow of $9 billion, three times the deficit analysts had projected. Search revenue, Alphabet's core business, grew only 12 percent year-on-year to $63 billion, the slowest pace in five quarters, despite search queries hitting five-year highs. Analysts warned the results bring search-cannibalization fears back to the forefront, as users increasingly interact with AI assistants rather than performing traditional ad-generating searches. The financial pressure stems from Alphabet's own massive AI infrastructure spending as it races to remain competitive. The one bright spot was Google Cloud, whose revenue more than doubled to nearly $31 billion, with an order backlog of roughly $560 billion reflecting strong enterprise demand for AI computing. Despite the cloud strength, the overall signal spooked markets: if AI agents continue to erode search use, the advertising model underpinning the world's most profitable internet company faces a structural threat. By November 1 the stock had stabilised slightly, falling a further 1.45 percent on the day.