The dust has settled, and the numbers are in. Since June 10, when the summer transfer window opened, Chelsea has spent more than €600 million on new signings ($650m): 14 permanent signings and two on loan. In that time frame, covering the past two transfer windows, they released players to other clubs for a total of just over €65m ($70m), putting their net spend for 2022-23 at a number approaching $600m. During that time, they also changed owners, manager, chairman, scouting director and recruitment staff.
There may be other examples, but what springs to my mind was what happened at Real Madrid in the summer of 2009.