STOCKHOLM—Ericsson AB returned to profit in the fourth quarter but concerns about higher costs associated with new fifth-generation mobile networks and a slowdown in North America sent its shares down more than 7%. The Swedish telecom-equipment maker, emerging from years of costly restructuring, has bet big on the growing 5G market, where it is battling Finland’s Nokia Corp. and China’s Huawei Technologies Co. That effort, and cost cuts elsewhere, have started to bear fruit in recent quarters.

Source: Wall Street Journal January 24, 2020 12:16 UTC