Alphabet Shares Plunge as AI Spending Erases $500 Billion
Alphabet Inc. shares suffered a record one-day drop after third-quarter results revealed massive AI-driven cash burn and slowing search advertising monetization.
Shares of Alphabet Inc. plummeted between 12% and 13% on October 29, 2026, erasing approximately $500 billion in market value in the company's worst single-day decline since its IPO. The sell-off followed a third-quarter report where total revenue of $127.6 billion missed Wall Street estimates, primarily due to a shortfall in core advertising. While Google Cloud revenue surged 103% to $30.7 billion, search revenue growth slowed to 12%, falling below analyst expectations.
Investors reacted sharply to a negative free cash flow of $9.07 billion, the first such deficit in the company's 22-year public history. This cash burn was driven by $51.4 billion in quarterly capital expenditures for AI infrastructure. Alphabet disclosed that its total financial exposure to AI risks exceeds $1 trillion in purchase commitments and leases. Net income also fell 25% to $26.2 billion, impacted by an $8.7 billion loss on equity securities, including a stake in SpaceX.
Chief Business Officer Philipp Schindler acknowledged that the AI Mode search feature has led to lower monetization because users click fewer ads. To counter this, Google is expanding AI Mode advertisements to 10 international markets, including India, Canada, and Australia, and introducing multi-turn ads in the United States. CEO Sundar Pichai defended the spending as a long-range planning process and debuted Carbon, a new frontier AI model with cybersecurity capabilities.
The decline triggered a broader tech sector slide, dragging down the Nasdaq Composite. In contrast, Microsoft shares initially rose after beating estimates and reporting strong Azure growth, though they later dipped as investors questioned the long-term returns on massive AI investments across the industry.
