noun
joint owner; co-owner
Refers to a person who shares ownership of something with others, such as property, a business, or a digital account.
この土地の共有者は三人います。
There are three joint owners of this land.
アカウントの共有者を追加するには設定から行えます。
You can add a co-owner to the account from the settings.
所有者 is a general owner, not necessarily sharing with others. 共有者 emphasizes joint ownership.
Compound of 共有 (きょうゆう, 'joint ownership') + 者 (しゃ, 'person').