(Updates with market moves at the end of the day.)
The Nasdaq Composite and the S&P 500 fell the most in more than four weeks on Thursday as Alphabet (GOOG, GOOGL) and Tesla (TSLA) shares tumbled, while Brent crude rose back above $100 a barrel.
The Nasdaq shed nearly 2.2% to settle at 25,137.69, while the S&P 500 fell 1.2% to 7,408.30 -- marking their biggest one-day declines since June 23. The Dow Jones Industrial Average dipped 1% to 51,711.65. Most sectors were in the red, led by communication services and consumer discretionary, while industrials paced the gainers.
Alphabet's class A shares tumbled 7.1%, the worst performer on the Dow, while its class C shares slumped 6.9%. Tesla slumped nearly 15%, the steepest decline on the S&P 500.
Late Wednesday, the Google parent and Tesla indicated rising artificial intelligence capital spending that analysts said could drive a bigger cash burn than previously projected.
Brent futures were trading 6.3% higher at $100.03 a barrel, crossing the $100 level for the first time since May. West Texas Intermediate crude jumped 5.5% to $91.59.
The Iran-backed Houthi militants in Yemen reportedly claimed attacks on two Saudi Arabian oil tankers in the Red Sea.
US President Donald Trump threatened "major military punishment" against Iran if its Houthi proxy continues attacking ships, according to his social media post on Thursday. The US Central Command said Wednesday it struck Iran for the 12th consecutive night.
Treasury yields jumped, with the two-year rate up 4.9 basis points at 4.35% and the 10-year rate rising 4.2 basis points to 4.7%.
"Rising oil prices have revived talk of a (Federal Reserve) rate hike, with rates markets now beginning to treat next week's (Federal Open Market Committee) meeting as a live decision after the 10-year yield pushed back toward its year-to-date high," Saxo Bank said in a report Thursday.
The probability that the Fed will leave its benchmark lending rate unchanged next week fell to 64% Thursday from 88% a week earlier, according to the CME FedWatch tool. The odds of a quarter-percentage-point increase rose to 36% from 12%.
Elsewhere in the corporate sector, RTX (RTX) and Lockheed Martin (LMT) raised their full-year guidance after both defense contractors reported second-quarter results above Wall Street's expectations. Lockheed jumped nearly 11%, the biggest gain on the S&P 500, while RTX advanced 7.3%.
Gold fell 2.5% to $4,047.90 per troy ounce, while silver lost 4.2% to $57.75 per ounce.



