SQL Server Audit Action Group:
DATABASE_OWNERSHIP_CHANGE_GROUP
This group tracks ownership changes on the actual database. If you enable this group in a server audit specification that will track ownership changes on all databases within that SQL Server instance. If you enable this group in a database audit specification it will track ownership changes to that database only.
Since ownership is important to the database and information with it, this is an important group to audit.
LOGbinder for SQL Server
events generated under this
Audit Action Group: