noun
wholly-owned subsidiary
A company whose shares are entirely owned by a parent company. Common in business and legal contexts.
その会社は大手メーカーの完全子会社です。
That company is a wholly-owned subsidiary of a major manufacturer.
子会社 is a general subsidiary, while 完全子会社 specifically means a wholly-owned subsidiary with 100% ownership.
Compound of 完全 (complete) and 子会社 (subsidiary).