Alphabet Faces Nearly $500 Billion Market-Value Loss in Historic Sell-Off

Alphabet shares plunged after the company's third-quarter results, putting nearly $500 billion in market value at risk in what could become the largest single-day loss in the company's history.

Alphabet shares suffered a historic decline after its third-quarter results raised investor concerns about the cost and returns of its artificial intelligence investments.

The stock fell approximately 12.6% on Thursday, its steepest one-day decline since the company went public in 2004, according to Jared Blikre's report for Yahoo Finance.

The decline threatened to erase approximately $496 billion from Alphabet's market capitalization, potentially making it the second-largest one-day market-value loss ever recorded for a US-listed company.

Only Nvidia has suffered a larger loss. Its market value fell approximately $593 billion on January 27, 2025, when concerns about China's DeepSeek artificial intelligence model rattled technology investors.

Alphabet's projected loss was substantially larger than its previous worst single-day decline of approximately $275 billion on July 23, 2026.

According to Yahoo Finance calculations, Alphabet shares would have needed to fall to approximately $274.75, or roughly 15%, to match Nvidia's record loss.

The company's decline also exceeded the approximately $400 billion loss suffered by SpaceX on June 22, previously the second-largest one-day market-value decline cited in the report.

The sell-off followed Alphabet's release of its third-quarter financial results on October 28.

The company reported revenue of $127.6 billion, up 25% from a year earlier, while net income reached $26.2 billion and earnings per share totaled $2.12.

Google Cloud revenue surged 103% to $30.7 billion, reflecting strong demand for cloud infrastructure and artificial intelligence services.

However, Alphabet's capital expenditures reached $51.4 billion during the quarter, raising questions about whether the company's expanding investments would generate sufficient returns.

The stock's decline was also on track to become its steepest post-earnings drop since its 2004 public listing, according to Bespoke Investment Group.

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The previous record was a decline of nearly 10% in July 2008.

The sell-off underscored investor concerns about the cost of competing in the AI market, even as Alphabet reported strong revenue growth and accelerating demand for its cloud services.