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Alphabet, the parent of Google, had the worst trading day in its history on Thursday, October 29, as investors reacted badly to a quarter of record spending and negative cash flow. The shares fell about 13 percent, with different outlets reporting 12.6 percent to nearly 13 percent depending on the share class and the close, wiping out roughly $500 billion in market value, according to CNBC, CNN and Yahoo Finance. It was the steepest one-day drop since Google went public in 2004 and surpassed the previous record fall of 11.63 percent set in March 2020, at the height of the pandemic panic.
The dollar figure puts the day in historic company. Estimates of the loss ranged from about $496 billion to roughly $500 billion, which makes it the second-largest one-day market value wipeout in US stock market history. Only Nvidia lost more, about $589 billion to $593 billion on January 27, 2025, the day China’s DeepSeek rattled AI investors, according to CNN and Yahoo Finance. Alphabet, still worth about $3.47 trillion after the fall and America’s fourth-largest company, saw its previous worst day in dollar terms, about $275 billion on July 23, 2026, dwarfed. Yahoo Finance calculated that Alphabet has now lost about $1.4 trillion in value since its record high in May. The sell-off dragged on the broader market: the Nasdaq Composite closed down 1.38 percent, the S&P 500 slipped about 0.3 percent and the Philadelphia semiconductor index fell 1.4 percent.
The trigger was Alphabet’s third-quarter results, released after the market closed on Wednesday, October 28. Revenue was $127.6 billion, slightly below the $128.2 billion analysts expected, according to Startup Fortune’s summary, and the company’s biggest earner, search advertising, grew 12 percent to $63.35 billion but missed forecasts, CNBC reported. The bigger issue was cash. Alphabet reported negative free cash flow of $9.07 billion for the quarter, much worse than the $2.7 billion shortfall analysts had expected, while keeping its full-year capital expenditure guidance at between $195 billion and $205 billion. Free cash flow is the money left after a company pays for its operations and its investments, and a negative figure means the business spent more than it generated.
Spending on artificial intelligence is the heart of the story. Alphabet reported $51.4 billion of capital expenditure in the third quarter alone, compared with $91.4 billion for the whole of 2025, according to CNN’s report, which is more than double the level of a year earlier. The company also raised almost $80 billion in capital in June to fund its AI build-out, Yahoo Finance noted, and it issued 36 million new shares during the quarter, according to The Motley Fool. Net income was $26.2 billion, down 25 percent from the prior-year quarter, and diluted earnings per share were $2.12, down 26 percent, the Fool reported. The Fool also noted that the quarter’s operating income of $40.6 billion was cut by an $8.2 billion net decline from other expenses.
The sell-off came despite parts of the report that were strong. The Fool’s headline pointed to cloud growth of 103 percent, and the article argued that results were not that bad, with revenue and operating income soaring. The disappointment was about the price of growth. Investors have been willing to tolerate heavy AI investment as long as it comes with clear signs of payback, and Alphabet’s combination of slower search growth, negative cash flow and rising spending struck many as a warning. CNN reported that investors grew increasingly concerned about rising AI spending and slowing growth in its search advertising business. Mike O’Rourke, chief market strategist at JonesTrading, told The Wall Street Journal that Google showed vulnerability to AI, a reference to fears that AI chat tools could eat into traditional search. Alphabet’s stock also formed what analysts call a “death cross,” when a short-term average price falls below a long-term average, which some technical traders read as a sign of more weakness, according to the same Yahoo Finance report.
The contrast with Microsoft sharpened the verdict. Microsoft, which also spends heavily on AI infrastructure, reported $18.6 billion in free cash flow in its latest quarter, and its shares ended Thursday largely unchanged after initially rising in after-hours trading, according to CNN and Yahoo Finance. Alphabet, by comparison, fell more than 12 percent. Analysts quoted in the coverage said the difference lay in how convincingly each company showed that AI spending was turning into revenue and cash. One CNBC-quoted commentator described Alphabet’s results as a fairly messy set and the earnings call as poorly handled, a view that is an opinion and not a finding.
Management’s message was that AI is working. According to CNBC, a company executive said Alphabet is scaling advertising within its AI Overviews and AI Mode products, including in international markets, which is its answer to the question of how search will make money in an AI-driven world. Whether that revenue arrives quickly enough to cover a capital budget approaching $200 billion is the question investors are now asking. The reports reviewed do not include a detailed response from the company to the market reaction beyond its earnings statements.
The human side of such a drop is also visible. Startup Fortune, citing Bloomberg’s tracking of insider stakes, said co-founders Larry Page and Sergey Brin saw roughly $60 billion vanish from their combined paper wealth on October 29 alone. Paper losses are not realised, and a share price can recover, but the scale shows how concentrated ownership is in these companies. For ordinary savers, the effect arrives through pension funds and index funds, which hold large positions in the biggest technology stocks, so a fall like this can dent portfolios even if the savers never bought Alphabet directly.
This week’s drop belongs to a broader pattern of doubt about the economics of AI. In recent weeks, Samsung guided to record profit on AI memory demand, SpaceX was reported to be seeking tens of billions of dollars in debt to buy Nvidia chips, the Australian data centre company Firmus weighed cutting its IPO price, and the International Monetary Fund warned that market disappointment over AI earnings could become a far-reaching shock. Alphabet’s results added a major example of a company with a strong core business spending at a pace that markets found hard to justify. It does not prove that AI spending is a mistake, and it does not mean Alphabet’s business is failing; it shows that investors are now pricing in the risk that returns will come later or smaller than hoped.
What to watch next is the follow-through. Analysts will look at whether the stock stabilises or continues to slide, whether other AI spenders such as Amazon and Meta face similar scrutiny when they report, and whether Alphabet changes its spending plans or says more about the payback on AI. The company’s own filings and presentations are published on its Alphabet investor relations site, and CNBC has a detailed account of the results and the stock reaction in its report on the sell-off.
Readers who follow global markets, technology and business stories can find more coverage at BusinessTech Nigeria. For one day, Wall Street asked a simple question of one of its most valuable companies: what exactly are we getting for all this spending? The answer will shape how every big technology company talks about AI in the coming quarters.
