Steep tech drop pulls US stock indexes mostly lower; Dow up

A steep slide in big technology companies pulled the major U.S. stock indexes mostly lower Wednesday, offsetting strength in banks and health care and erasing some of the gains the market made a day earlier.

The tech-heavy Nasdaq composite, which is the best-performing index this year, had its biggest single-day drop since August as investors cashed in some of their winnings and bid up shares in h...