This is a corporate action in which a company buys most, if not all, of the target company's ownership stakes in order to assume control of the target firm. This is known as :

Merger Acquisition Consolidation Absorption

Acquisition

Acquisition: A corporate action in which a company buys most, if not all, of the target company's ownership stakes in order to assume control of the target firm. Acquisitions are often made as part of a company's growth strategy whereby it is more beneficial to take over an existing firm's operations and niche compared to expanding on its own. Acquisitions are often paid in cash, the acquiring company's stock or a combination of both. An acquisition, also known as a takeover, is the buying of one company (the target) by another.