Federal Trade Commission Files Antitrust Lawsuit Against Qualcomm

WASHINGTON—The Federal Trade Commission on Tuesday sued Qualcomm Inc., alleging the semiconductor company engaged in unlawful tactics to maintain a monopoly on a type of chip used in cellphones.

The FTC, in a suit filed in a California federal court, alleged that Qualcomm used its position as the dominant provider of baseband processors, devices that enable cellular communications, to impose onerous terms on phone manufacturers and...