Alphabet Stock Plunges 12% as AI Search Fails to Generate Expected Returns

Alphabet's stock fell more than 12% on Thursday following third-quarter earnings that revealed slowing search revenue growth and disappointing monetization from its AI search mode. The decline marked the company's steepest post-earnings drop since its 2004 initial public offering, with the stock losing approximately $524 billion in market value—the second-largest one-day loss for any US-listed company.

The earnings report disclosed several concerning trends. Alphabet reported quarterly revenue of $127.6 billion, up 25% year-over-year but below analyst expectations of roughly $128 billion. More troubling for investors, Google's core search business—historically a cash-generation engine—showed signs of strain. Search revenue grew just 12% in the third quarter, down from 17% growth in the previous quarter and 19% in the first quarter. Chief Business Officer Philipp Schindler acknowledged that Google's AI Mode search queries generate less revenue per query than traditional search, despite the company's aggressive push to adopt the feature. The company projects search will remain under pressure as users shift to AI-powered alternatives.

Capital expenditure reached $51.4 billion in the quarter, more than double the $24 billion spent a year earlier. Alphabet reported negative free cash flow of $9.1 billion for the quarter—the second consecutive quarter of negative cash flow—as the company invests heavily in AI infrastructure and data centers. The company raised its full-year capital expenditure forecast to $195 billion to $205 billion and signaled further increases in 2027, intensifying investor concerns about whether massive AI spending will ever produce proportional returns. CEO Sundar Pichai characterized the spending as "a long-range planning process, not a short-term allocation exercise."

The selloff rippled across global markets. US stock indices fell on Thursday: the Nasdaq Composite dropped 1.38%, the S&P 500 fell 0.3%, and the Dow Jones Industrial Average declined 0.25%. The decline spread internationally, with Asian markets experiencing sharp losses. South Korea's KOSPI fell 3%, Japan's Nikkei 225 rose modestly, and Taiwan's stock market declined 3.17%, driven partly by disappointing Samsung Electronics earnings. Semiconductor stocks globally tumbled, including Singapore-listed chip manufacturers and the US Philadelphia Semiconductor Index. Amazon and Intel also reported disappointing results after hours, further damping sentiment on AI spending bets. Cloud providers, however, showed mixed results: Google Cloud revenue more than doubled to $30.71 billion and beat expectations, while Amazon Web Services reported strong growth but Amazon's overall results disappointed.

The Alphabet earnings intensified an emerging debate about AI's return on investment. Several analysts noted that the quarter represents the first evidence that AI investment is starting to harm Google's core search business. Research firms and investors expressed concern that tech giants are spending tens of billions on AI infrastructure without clear pathways to profitability. The Federal Reserve's decision to hold rates unchanged Wednesday, paired with signals of fewer policy meetings in 2027, added uncertainty about the economic backdrop for tech spending. Alphabet's Chief Financial Officer indicated the company remains optimistic about AI Mode's long-term potential and plans to introduce more advertising into the feature to improve monetization, though no timeline or targets were provided.