Buy-the-Dip Investors Rescue Market From a Dismal Week

A selloff that thrashed U.S. stocks and extended into international markets ran headlong Friday into one of the most powerful forces in the U.S’s multiyear rally.

- By DAVID UBERTI

After the opening bell rang in New York on Friday, shares in Nvidia, Oracle and other companies at the heart of the artificial-intelligence boom careened low enough to flash a green light for dip-buyers. Stocks quickly pared much of their losses,