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Finance & Markets · North America

Alphabet shares fall 13% as market value drops about $500 billion

Alphabet shares fell roughly 13%, wiping out about $500 billion in market value in one trading session. Startup Fortune attributed the decline to the company’s third-quarter earnings, released the day before, while Moody’s had warned of rapidly rising AI capital spending across major technology companies.

AI-assisted synthesis · Based on 5 outlets' reporting · Article text read from 1 of 5 outletsHow it's made

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5 outlets3 regionsLatest reporting 3 min readNo new reporting in 3 days
Coverage: Mostly CenterL 0 · C 2 · R 1 · 2 unrated
Updat3 graphic: Alphabet
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What happened

Key facts

  • Alphabet shares fell roughly 13% on October 29, wiping out about $500 billion in market value in one session (per startupfortune.com).
  • Alphabet lost $500 billion in market capitalization in one day, the second-largest such loss in Wall Street history (per sbs.co.kr, startupfortune.com, Fox Business).
  • Alphabet released its third-quarter earnings on October 28, a day before its shares fell (per startupfortune.com).
  • Moody’s issued a sector-wide credit warning on July 24, saying six major technology companies’ combined AI capital spending would reach $785 billion in 2026 and approach $1 trillion by 2027 (per startupfortune.com).
  • Alphabet, Microsoft, Meta and Amazon were on pace to spend roughly $700 billion combined on AI capital spending that year (per startupfortune.com).
  • Nvidia lost roughly $593 billion in market value on January 27, 2025, the only larger single-day loss by a U.S. company cited in the account (per startupfortune.com).

The brief

Alphabet shares dropped roughly 13% on October 29, erasing about $500 billion in market value in one session, according to Startup Fortune. The outlet said the fall followed Alphabet’s third-quarter earnings release on October 28.

News24 described the wipeout as $711 billion, while an SBS headline put the one-day loss at $500 billion and called it the second-largest in Wall Street history. Startup Fortune attributed the share decline to the earnings release, but did not provide the results or identify a particular figure within them as the trigger.

Its account placed the market move against concerns about the scale of AI investment among major technology companies. On July 24, Moody’s issued a sector-wide credit warning, according to Startup Fortune. The warning said six major technology companies would spend $785 billion combined on AI in 2026, with total spending approaching $1 trillion by 2027.

Alphabet, Microsoft, Meta and Amazon were on pace to spend roughly $700 billion combined on AI that year, the outlet reported. It also cited some Wall Street forecasts projecting that these four companies’ combined spending would exceed $1 trillion in 2027. Those estimates concern spending across the companies, not Alphabet alone.

The account compared Alphabet’s single-session loss with Nvidia’s roughly $593 billion decline on January 27, 2025. Startup Fortune said that was the only larger one-day market-value loss by a U.S. company. It linked Nvidia’s decline to the arrival of China’s DeepSeek model, which it said unsettled chip investors.

The reporting also described a broader October decline, saying the two market moves together put the combined loss in Alphabet’s market value for the month above $1 trillion. That figure includes the October 29 drop and is distinct from the roughly $500 billion attributed to that session alone.

The headline framing varies: Fox Business and the BBC emphasize AI spending concerns, while the supplied SBS headline stresses the historical scale of the one-day loss. The figures in News24’s headline and Startup Fortune’s account differ; the available reporting does not explain the discrepancy.

The sources identify no specific spending decision, forecast revision or further company action following the share decline.

Why it matters

  • Alphabet shareholders faced a roughly 13% share-price decline and an estimated $500 billion reduction in market value in one session, according to Startup Fortune.
  • The spending figures concern large technology companies: Alphabet, Microsoft, Meta and Amazon were on pace for roughly $700 billion in combined AI investment that year.
  • Moody’s warning put the sector’s projected AI spending at $785 billion for six major technology companies in 2026, approaching $1 trillion by 2027.

What to watch next

  • Whether Alphabet’s shares continue to move after the October 28 third-quarter earnings release.
  • Whether the combined AI spending of Alphabet, Microsoft, Meta and Amazon approaches the reported $700 billion pace.
  • Whether the six technology companies’ projected AI spending approaches the $1 trillion level Moody’s cited for 2027.

How it's being covered

Coverage analysisShow details
5 source articles · 5 unique outlets
Outlet political mix: Mostly Center· 2 Center · 1 Right · 2 unrated
Where the outlets are based: US/Canada 40% · Asia 40% · Other 20%
Outlet political mix
Mostly Center
Left
Center
Right
0 outlets
2 outlets
1 outlet
The marker shows coverage balance: each unique outlet counts once. 2 unrated outlets are not included.
Geography
Where the outlets covering this story are based.
5 unique outletsDominant coverage: US/Canada
How we measure coverage

How outlets' accounts compare

Updat3 does not yet have enough full reports to compare how outlets framed this story.

Timeline

Developments from this story's sources, dated background we compiled and fact-checked, and our earlier coverage. Each row says which.
  1. Larry Page and Sergey Brin founded Google.
    Background · compiled and fact-checked by Updat3
  2. Alphabet itself was created in a corporate restructuring announced on August 10, 2015, with Google becoming its largest subsidiary.
    Background · from our historical context
  3. The current AI investment cycle accelerated after OpenAI released ChatGPT on November 30, 2022, drawing attention to generative AI products and the computing capacity needed to build and run them.
    Background · from our historical context
  4. Google introduced Bard, its conversational AI service.
    Background · compiled and fact-checked by Updat3
  5. Google renamed Bard as Gemini.
    Background · compiled and fact-checked by Updat3
  6. Nvidia lost roughly $593 billion in market value on January 27, 2025, the only larger single-day loss by a U.S. company cited in the account.
    Reported in this story's sourcesSource:startupfortune.com
  7. Alphabet released its third-quarter earnings on October 28, a day before its shares fell.
    Reported in this story's sourcesSource:startupfortune.com
  8. Alphabet shares fell roughly 13% on October 29, wiping out about $500 billion in market value in one session.
    Reported in this story's sourcesSource:startupfortune.com

How we got here

Alphabet released its third-quarter earnings on October 28, 2026, one day before the October 29 share-price decline. A market precedent for an unusually large single-day loss came on January 27, 2025, when Nvidia lost about $593 billion in market value.

On July 24, 2026, Moody’s warned that six major technology companies’ combined AI capital spending could reach $785 billion in 2026 and approach $1 trillion in 2027; Alphabet, Microsoft, Meta and Amazon were on pace to spend about $700 billion combined that year.

Original sources

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