NEW YORK — Drops for computer chipmakers and other winners of the artificial-intelligence boom dragged down stock markets worldwide on Thursday.

The S&P 500 fell 0.5 per cent, even though more stocks rose within the index than fell. The Dow Jones Industrial Average dipped 105 points, or 0.2 per cent, and the Nasdaq composite sank 1.5 per cent.

Nearly three out of every four stocks rose within the S&P 500 after more of the country’s biggest companies reported better earnings for the latest quarter than analysts expected.

Abbott jumped 10.7 per cent after the healthcare company delivered a fatter…