US STOCKS-Wall Street ends sharply down as AI worries weigh

By Noel Randewich

Feb 5 (Reuters) - Wall Street ended sharply lower on Thursday, with the Nasdaq dragged to its lowest since November by losses in Microsoft MSFT.O, Amazon AMZN.O and other tech heavyweights after Alphabet GOOGL.O said it could double capital spending on AI in the race to dominate the emerging technology.

Shares of Alphabet fell after the Google parent said it plans as much as $185 billion in capex in 2026. Together, it and its Big Tech rivals are expected to collectively shell out more than $500 billion on AI this year.

Adding to recent losses, Microsoft, Palantir PLTR.O Oracle ORCL.N declined.

Amazon AMZN.O slid ahead of quarterly results it will release after the closing bell. Investors will focus on the cloud computing heavyweight's plans for additional spending to build AI data centers.

Shares of chipmaker Nvidia NVDA.O, which stands to benefit from increased industry spending on AI, also declined.

Investors in recent months have grown more wary of heavy spending on AI, awaiting stronger signs those investments are actually boosting revenue and profits.

"This is the first time we've seen the large-cap tech companies -- the Microsofts and the Alphabets and the Amazons -- go through a really large capex cycle ... and we're seeing this volatility about whether this investment will translate, ultimately, into results," said Tom Hainlin, an investment strategist at U.S. Bank Wealth Management in Minneapolis.

Investors this week have also worried that rapidly improving AI tools could eat into demand for traditional software, squeezing profit margins across the sector.

Software and data services stocks added to recent losses, with ServiceNow NOW.N and Salesforce CRM.N both losing ground.

The S&P 500 software and services index .SPLRCIS fell for a seventh straight session.

"The AI trade which was the accelerant last year is perhaps the extinguisher this year with people realizing that AI is going to help certain kinds of companies but it is also going to hurt, particularly software, for example," said Melissa Brown, SimCorp's managing director of investment decision research.

Qualcomm QCOM.O slid after forecasting second-quarter revenue and profit below estimates.

The CBOE volatility index .VIX, Wall Street's "fear gauge," briefly hit the highest in over two months.

As traders dialed back exposure to pricey AI stocks, the market's rotation into relatively cheaper stocks gained steam in recent days.

The S&P 500 value index .IVX dipped, but remained in positive territory for the week. The S&P 500 growth index .IGX was down more than 4% for the week.

According to preliminary data, the S&P 500 .SPX lost 82.73 points, or 1.20%, to end at 6,799.99 points, while the Nasdaq Composite .IXIC lost 360.33 points, or 1.57%, to 22,544.25. The Dow Jones Industrial Average .DJI fell 603.79 points, or 1.19%, to 48,897.51.

Snap SNAP.N topped fourth-quarter revenue estimates, but its shares declined.

Estee Lauder EL.N shares fell as the Clinique owner forecast annual results below estimates.

Fashion company Tapestry TPR.N rose after raising its annual profit forecast, while Hershey HSY.N climbed on a better-than-expected annual profit forecast.

The number of Americans filing new applications for unemployment increased more than expected for the week ended January 31, while job openings dropped to the lowest level in more than five years in December.