AI Stocks Plunge as Alphabet's Spending Plans Erase $500 Billion in a Single Day

A sharp reversal in sentiment for artificial intelligence stocks wiped out approximately $500 billion in combined market capitalization from Alphabet and Tesla in a single session on July 23, a day analysts are calling a breaking point for the frenzied AI trade.

The sell-off was ignited after Alphabet (NASDAQ: GOOGL) reported its second-quarter results on the evening of July 22 and raised its full-year 2026 capital expenditure outlook to a range of $195 billion to $205 billion. The staggering spending figure sparked investor anxiety over the immense costs and uncertain profitability timeline for AI infrastructure.

Broad Market Rout

The market's reaction on July 23 was severe. Alphabet's shares fell 7.1%, while Tesla (NASDAQ: TSLA) dropped 14.5%. The concern quickly spread beyond equities, with Bloomberg reporting that AI-related bonds were also hit as debt fears permeated the market.

The rout deepened in subsequent sessions. By July 28, the sell-off had gone global, with key market moves including:

• South Korea’s KOSPI index closing down 10.8%, with Samsung and SK Hynix falling 13.4% and 14.7% respectively.
• The Philadelphia Semiconductor Index dropping 4.5% on July 25 alone.
• The Nasdaq-100 falling to within 9.7% of its record high, approaching official correction territory.

A Shift in Sentiment

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The sell-off crystallized weeks of growing unease. Data from Goldman Sachs cited by Reuters showed hedge funds had been reducing their exposure to technology hardware for four consecutive weeks leading into July. The scale of Alphabet's planned spending appeared to exhaust investor patience for funding AI development.

"The fear of missing out is becoming more like a fear of massive overbuilding," Peter Andersen, CEO of Andersen Capital Management, told Reuters. The concern was echoed by credit rating agency Fitch, which on July 28 warned that an AI market correction was emerging as a major global credit risk.

What's Next

The central debate for investors is whether the downturn reflects a fundamental reassessment of AI's value or a temporary panic. As of Tuesday's close, no major tech company had officially announced a pullback in spending plans.

However, the market faces a critical test on Wednesday, July 29, with both Meta Platforms (NASDAQ: META) and Microsoft (NASDAQ: MSFT) scheduled to report earnings after the market close. Any guidance from these companies suggesting a slowdown in infrastructure investment could provide the fundamental confirmation that bears have been looking for, potentially intensifying the sell-off.