Google's parent company Alphabet has just lived through the worst trading day in its history. On Thursday, October 29, its Class A shares fell 12.64% to close at $283.82 on Wall Street, wiping out roughly $499.8 billion in market value, according to The Wall Street Journal. Investors punished the company for a quarterly revenue miss, slowing search growth and an artificial intelligence spending bill that keeps getting bigger.
The fall is the second-largest single-day loss of market value for any company in stock market history, behind only Nvidia's drop of about $589 billion in January 2025. Alphabet's previous one-day record loss, about $275 billion, came in July.
What Alphabet reported
The selloff followed Alphabet's third-quarter results, released on Wednesday, October 28. On the surface, the numbers looked strong. Total revenue rose 25% year on year to $127.6 billion, but that was still below what Wall Street had been expecting.
The bigger worry was Google Search, the company's main money machine. Search revenue grew 12%, a clear slowdown from 17% growth in the previous quarter. At a time when AI chatbots are changing how people look for information, any sign of weakness in search is read as a warning.
Cloud boom, but at a cost
Google Cloud was the bright spot. Revenue in the unit more than doubled, up 103% to $30.7 billion, comfortably ahead of analysts' estimate of $29.2 billion. Demand for AI computing is clearly running hot.
Meeting that demand, however, is expensive. Alphabet spent about $51.4 billion on capital expenditure in the quarter alone, mostly on data centres and computing hardware. It expects full-year 2026 capex of $195 billion to $205 billion, and has indicated that spending will rise significantly again in 2027. Chief Financial Officer Anat Ashkenazi also warned that Google Cloud's profit margins could come under near-term pressure because the company is relying on outside computing capacity to keep up with customers.
| Metric | Figure |
|---|---|
| Share fall on October 29 | 12.64% (Class A) |
| Closing price | $283.82 |
| Market value lost | About $499.8 billion |
| Q3 revenue | $127.6 billion, up 25% |
| Search revenue growth | 12% (17% previous quarter) |
| Google Cloud revenue | $30.7 billion, up 103% |
| Q3 capital expenditure | About $51.4 billion |
| 2026 capex guidance | $195–205 billion |
Why markets reacted so sharply
For two years, investors have rewarded big tech companies for pouring money into AI. That patience now appears to be wearing thin. The question being asked on Wall Street is simple: when will these hundreds of billions of dollars produce matching profits? Alphabet's mix of a revenue miss, slower search and higher spending gave sceptics their answer for now.
The mood spread across the sector. Amazon shares fell in premarket trading on Friday after disappointing results, while Intel slid more than 25% before the opening bell after flagging a major supply chain disruption and slowing demand for personal computers.
What it means for India
The drop matters well beyond Wall Street. Google is one of the largest technology employers in India, with major offices in Bengaluru, Hyderabad, Gurugram and Mumbai, and it has been building out AI and cloud infrastructure in the country. A company under pressure to control costs often looks harder at hiring and new projects, even if it keeps spending on core AI capacity.
Many Indian investors also hold Alphabet shares through international investing apps, US-focused mutual funds and Nasdaq index funds, so the fall will show up directly in their portfolios. More broadly, a cooling of enthusiasm for AI stocks in the US can affect sentiment towards Indian IT companies, whose growth story increasingly depends on clients' AI budgets.
For ordinary users of Search, Gmail, YouTube and Android, nothing changes overnight. If anything, the results show Google is doubling down on AI features across its products rather than pulling back.
What happens next
Analysts will now watch whether Alphabet's heavy spending translates into faster cloud profits and whether search growth stabilises in the coming quarters. The company's capex plans for 2027, and any comments from chief executive Sundar Pichai on returns from AI, will be closely studied. Results from other AI-heavy giants will also show whether this was an Alphabet-specific shock or the start of a wider rethink on AI valuations.
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