Trading was choppy in Alphabet, which closed down 1.5%. It will be under scrutiny after a delay in the launch of a model central to its AI ambitions. Texas Instruments TXN.O lost ground in extended trading after finishing the regular session up 1% before it issued its results and forecast current quarter revenue above expectations.
After closing the regular session down 1.3%, Tesla added to losses in late trade, falling 3% after it reported negative free cash flow in the second quarter for the first time in more than two years.
The crowded earnings calendar leaves markets vulnerable to sharper swings this week, while geopolitical tensions added another layer of caution.
Crude oil futures recorded their highest settlement since June 11, up around 3% on the day as Yemen's Iran-backed Houthi militia threatened shipping in the Red Sea, one of the world's most important energy chokepoints along with the Strait of Hormuz.
U.S. President Donald Trump vowed on Wednesday to destroy an Iranian bridge or power plant every time Iran shoots at a ship in the strait.
"Excluding the megacap AI trade, there's an element of what's going on with oil that's driving the market," said Schwab's Gordon, noting that high oil prices are fanning inflation worries. "People are being defensive with utilities, but with energy and materials being higher, that's the inflation component."
Shares in Super Micro Computer SMCI.O rallied 19.8%, making it the S&P 500's biggest percentage gainer on the day, after the server maker said it had secured more than $60 billion in new orders in the fourth quarter. Among its peers, Dell Technologies DELL.N finished up 9.3% while Hewlett Packard Enterprise HPE.N added 3% after Super Micro reported upbeat preliminary results.
Among other movers, AT&T T.N advanced 3.5% after the telecom firm added more wireless subscribers than expected in the second quarter. Philip Morris International PM.N shares rose 3.3% after stronger cigarette demand helped the company beat quarterly results estimates.
Declining issues outnumbered advancers by a 1.26-to-1 ratio on the NYSE where there were 142 new highs and 161 new lows. On the Nasdaq, 1,665 stocks rose and 3,103 fell as declining issues outnumbered advancers by a 1.86-to-1 ratio.
The S&P 500 posted 14 new 52-week highs and 2 new lows while the Nasdaq Composite recorded 45 new highs and 104 new lows.
On U.S. exchanges, trading volume was relatively light with 15.16 billion shares changing hands compared with the 19.05 billion moving average for the last 20 sessions.
Big tech results and AI spending remain in focus
The Philadelphia SE Semiconductor index .SOX ended up 0.4%, recovering from early losses for its third straight session of gains after three days of losses that had confirmed it was in a bear market late last week.
Second-quarter results were due after the bell from Alphabet GOOGL.O and Tesla TSLA.O, the first of the so-called "Magnificent Seven" megacap companies to report. Investors were hoping for fresh evidence that these companies' multibillion-dollar investments in AI are paying off.
"Investors have become a lot more discerning and specific as to where they're choosing to invest in the AI trade," said Kevin Gordon, head of macro research and strategy at Charles Schwab, noting the stark difference in performance between software and chip stocks on the day.
The Dow Jones Industrial Average .DJI fell 6.06 points, or 0.01%, to 52,218.58, the S&P 500 .SPX lost 10.24 points, or 0.14%, to 7,498.96 and the Nasdaq Composite .IXIC lost 146.30 points, or 0.57%, to 25,690.90.
Wall Street edges lower as tech earnings and oil prices weigh
The Nasdaq led Wall Street lower on Wednesday with a mixed performance from technology stocks, as investors waited for key earnings reports to gauge the health of a market rally fed by enthusiasm for artificial intelligence.
The S&P 500 fell slightly and the Dow ended virtually unchanged as traders also monitored the latest Middle East hostilities, which led oil futures to settle at a six-week high, fanning inflation worries.
After months of gains that lifted the major indexes from their March lows, momentum has been wobbling with uneven trading in heavyweight semiconductor stocks and weakness in software companies.
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