The Braves have been somewhat unique for a while in that the team itself owned and operated most of its minor league affiliates. In many cases, minor league teams have individual owners and then enter into agreements with teams to be their affiliate for a period of time.
The Braves did have some teams that fit into that latter category including the Carolina Mudcats, Florida FireFrogs, and Augusta GreenJackets, but other than those, their affiliates were Braves properties.
However, it had been recently reported that a company called Endeavor was looking to form a holding company that would then begin purchasing minor league teams in bulk to try to operate at a scale that could make them more profitable and to add some level of uniformity to how the business side of minor league teams operate.