• Alphabet shares fell 5%, extending a decline driven by investor unease over rising AI capital expenditures.
  • The sell-off mirrors a broader tech downturn as markets reassess the near-term payoff of massive AI investments.
  • Analysts caution that while Alphabet's ad revenue remains resilient, cloud growth and AI costs will be key to watch.

Alphabet Inc. shares tumbled 5% in trading on Monday, adding to recent losses as investors digested the implications of the company's heavy spending on artificial intelligence infrastructure. The decline came amid a broader tech sell-off, with peers like Microsoft and Amazon also under pressure as markets recalibrate expectations for AI-driven returns.

“The market is asking hard questions about the ROI on AI capex,” said a technology analyst at a major investment bank, who requested anonymity because they are not authorized to speak publicly. Even as Alphabet's core advertising business holds up, the scale of investment in data centers and AI model training has unnerved some shareholders.

The company's capital expenditure in the latest quarter surged to $14 billion, up from $11 billion a year earlier, with executives signaling further increases ahead. According to people familiar with the matter, Alphabet's leadership has been internally debating the pace of spending, but remains committed to maintaining its competitive edge in AI against rivals like OpenAI and Microsoft.

“The long-term opportunity is enormous, but we need to see more tangible revenue from these bets,” said another analyst. “For now, the market is in a show-me phase.”

Google Cloud, a bright spot in recent quarters, has shown strong growth but still lags behind Amazon Web Services and Microsoft Azure in profitability. Some investors worry that Alphabet's AI investments will weigh on margins before delivering the promised growth.

The broader market context has not helped. Rising interest rates and regulatory headwinds, including antitrust probes in the U.S. and Europe, have added layers of uncertainty. Alphabet faces a potential breakup risk from the Department of Justice's antitrust case over its search dominance, though a final ruling remains months away.

Despite the current gloom, several analysts maintain a buy rating on the stock, citing Alphabet's moat in search and its deep AI talent pool. “This is a reset, not a reversal,” said one. “If execution stays on track, the payoff could be significant.”

Correction: A previous version of this article incorrectly stated Alphabet's capex figure. The correct number for the latest quarter is $14 billion. (Updated: 11:45 a.m. ET)