1. Make it possible to change the location of a holding (without companies) for a fee. Maybe 10% of what the last holding did cost.
2. Make a list of the Holdings of a region with their name and owner. This way you can easier find a buyer for your companies etc.
3. List the Holdings of a player on this profile page. With name and place of the Holding.
Maybe with the number of companies as well, maybe even with a detailed list of the companies when clicking on the holding.