NEW YORK (AP) — Stocks rebounded Friday, clawing back some of the week's steep losses, but the turbulent trading of the last few days left no doubt that the relative calm the markets enjoyed all summer had been shattered.

Major U.S. indexes ended the week down about 4 percent, their worst weekly loss in six months. An index measuring the performance of small-company stocks had its worst week since early 2016.

Big technology and consumer-focused companies led the recovery Friday. Longtime favorites of many investors, they had plunged in the last few days.

A major factor cited by market watchers...