NEW YORK, 29 October 2026 — Alphabet, the parent company of Google, suffered its steepest one-day share fall on record on Thursday as investors punished disappointing third-quarter earnings, renewed worries about the ballooning cost of artificial intelligence, and a slowdown in its core search advertising business.
Shares in the Google parent fell by more than 12% during Thursday's session, according to market reports, wiping roughly $500 billion from its market value and dragging the technology-heavy Nasdaq Composite down by more than 1%. Reuters reported during the session that Alphabet was on track for its steepest one-day fall on record, with a skid of 11.7% at that point accounting for most of the more than $500 billion the Nasdaq-100 was set to erase.
Illustration: A stock market trading screen showing a steep falling chart line.
What Happened
Alphabet reported third-quarter revenue of $127.6 billion on Wednesday, up 25% from a year earlier but short of analysts' expectations of about $128.2 billion, according to LSEG data cited by Reuters and other outlets. Net income fell 25% to $26.2 billion, while earnings per share came in at $2.12, well below forecasts of around $3.00.
Part of the earnings shortfall reflected $8.7 billion in equity investment losses, including its holding in SpaceX, as reported by market coverage of the results. Even allowing for that item, investors focused on two deeper concerns: search advertising grew at its slowest annual pace in five quarters, and the company's cash generation turned sharply negative as AI infrastructure spending accelerated.
Search advertising revenue rose 12% to $63.4 billion, against expectations of $64.9 billion, while YouTube advertising brought in $11.2 billion. Google's chief business officer, Philipp Schindler, told analysts that conversational searches conducted through AI Mode generate less advertising revenue, according to reports of the earnings call — a comment that sharpened questions about how AI search will make money.
The sell-off spread beyond Alphabet. At midday in New York on Thursday, the Dow Jones Industrial Average was down 0.35% at 52,292.29, the S&P 500 was down 0.32% at 7,719.52, and the Nasdaq Composite had shed 1.20% to 26,230.07, according to Reuters. Financials and healthcare showed strength, but that was outweighed by weakness in communications services stocks. Microsoft fell 1.5% following media reports it was planning to raise at least $25 billion through a bond sale, while Amazon dropped 2.9% ahead of its own quarterly earnings after markets closed.
Background
Alphabet's results landed in the middle of a month in which enthusiasm for the AI trade has been tempered by worries that debt-fuelled spending will be harder to justify as borrowing costs climb. Reuters noted that Anthropic's disclosure of its United States IPO filing on Monday had offered a short-lived reprieve before those fears resurfaced.
The numbers illustrate the scale of the build-out. Alphabet spent $51.3 billion on capital expenditures in the quarter, up from $44.9 billion in the previous three months, and free cash flow fell to negative $9.07 billion, compared with negative $5.9 billion in the prior quarter — which had been the first time the company went cash-flow negative in its 22-year history as a public company, according to The Hindu BusinessLine's Reuters report. Chief Financial Officer Anat Ashkenazi said capital expenditures would increase significantly in 2027, while this year's forecast was unchanged, and she warned of near-term margin pressure from the use of third-party cloud capacity.
Operating income still grew 30% to $40.6 billion, also missing projections, and the company reported a $7.66 billion operating income loss in "Alphabet-level activities," which it said primarily reflected expenses related to AI research and development. The cloud business expanded rapidly, according to Reuters, but that was not enough to offset concern about search and cash burn on the day.
Illustration: Rows of glowing servers inside a vast artificial intelligence data centre.
Why It Matters
The reaction matters because Alphabet is one of the largest weights in United States stock indices, and because its earnings are read as a verdict on the whole AI investment boom. When a company of this size loses roughly $500 billion in market value in a single session, pension funds, index trackers and ordinary savers feel it, even if they never bought the shares directly.
More broadly, the sell-off exposes the central tension of the AI boom: investors are worried both about overspending and about falling behind rivals by not spending enough. As Trevor Slaven, global head of asset allocation at Barings, told Reuters, the AI build-out ecosystem is "increasingly debt financed," which "creates more leverage and just creates a bit more risk in the system as well," even though it may grow potential economic profits over time.
That tension is playing out against a backdrop of rising borrowing costs. The Federal Reserve held interest rates steady on 28 October in a 10-2 decision, keeping its benchmark rate in the 3.75% to 4.00% range while saying inflation "remains elevated," and traders were pricing a high chance of a hike in December. Higher rates make debt-funded data centre construction more expensive, and they raise the bar for the returns those investments must eventually deliver.
For Google's core business, the results also raise a strategic question that goes beyond one quarter. If AI-powered answers satisfy users with fewer clicks on traditional adverts, search monetisation may grow more slowly even as search usage grows — a risk Schindler's comments brought into focus. Alphabet's challenge is to prove that AI Mode, cloud growth and new products can replace, and eventually exceed, the advertising revenue that AI search may displace.
What Happens Next
Investors will now watch three things. First, whether other big technology companies reporting this week confirm or contradict Alphabet's pattern of heavy AI spending and softer advertising — Amazon's results, due after Thursday's close, are the next major test. Second, whether Alphabet's fourth-quarter spending, implied by its unchanged 2026 capital expenditure forecast, comes in near the level analysts have calculated, and what guidance management gives for 2027. Third, whether the Federal Reserve's December decision, and the Bank of Japan's decision due on Friday, change the cost of funding the AI build-out.
Market strategists cautioned against reading a single day's fall as a verdict on AI itself. Cloud demand remains strong, and Alphabet's revenue still grew 25% year on year. The question for the coming quarters is narrower and harder: how quickly can AI investment turn into profit, and at what cost to cash flow along the way? Until that answer becomes clearer, sharp swings — in both directions — are likely to remain a feature of the AI trade.
Illustration: A person using a laptop with a search interface and an AI assistant.
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FAQ
Why did Alphabet shares fall so sharply on 29 October 2026?
Alphabet missed Wall Street profit and revenue expectations for the third quarter, search advertising grew more slowly than expected, and AI-related capital spending pushed free cash flow to negative $9.07 billion, rekindling worries about the cost of the AI build-out.
How big was the fall?
Shares fell by more than 12% on Thursday, with Reuters reporting an 11.7% skid during the session that was set to be the steepest one-day fall on record, and later reports putting the decline above 13% at its worst. The move wiped roughly $500 billion from Alphabet's market value.
What were Alphabet's third-quarter results?
Revenue was $127.6 billion, up 25% year on year but below the $128.2 billion expected; net income fell 25% to $26.2 billion; and earnings per share were $2.12, against forecasts of around $3.00, according to LSEG data cited in market reports.
Why is AI spending hurting Alphabet's cash flow?
Alphabet spent $51.3 billion on capital expenditures in the quarter, mainly to expand cloud capacity and fund AI research, and warned spending would rise significantly in 2027. That pushed free cash flow negative for a second consecutive quarter.
Does the fall mean the AI boom is over?
Not on this evidence alone. Revenue still grew 25% and the cloud business expanded rapidly. The sell-off reflects concern about the pace and payoff of AI spending, not a collapse in demand for AI services — but it shows investors now want clearer evidence of returns.
Sources
- Reuters, "Nasdaq falls as Alphabet set for record loss amid AI spending woes," 29 October 2026 (via syndication).
- Reuters via The Hindu BusinessLine, "Alphabet misses earnings estimates as AI spending drives cash burn," 29 October 2026.
- Reuters, "Trading Day: Communication breakdown," 29 October 2026.
- Reuters, "Central banks take a breather, though more hikes are to come," 29 October 2026.
- Reuters, "Federal Reserve holds rates steady," 28 October 2026.
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