Longman Dictionary of Contemporary English
Wiktionary
n. (context legal English) A company that owns or controls another company.
Wikipedia
A parent company is a company that owns enough voting stock in another firm to control management and operation by doing and influencing or electing its board of directors. The second company is deemed a subsidiary of the parent company.
Usage examples of "parent company".
The worn carpet was sea-blue, the parent company's corporate color.
The niche had been created by a Microsoft employee whose favorite uncle had died over North Vietnam while flying an F-105 fighter-bomber, and who did his patriotic work entirely without the knowledge of his parent company.
That, coupled with the responsibilities of being a platoon leader and attached out with his platoon from his parent company to a mechanized infantry company, made for an almost overwhelming combination.
Both killed the subject in anywhere from 24 hours to a week, but Robert had liked them, even though they'd never be mentioned in Threshold's quarterly report to its parent company.