John Malone – Sampson Cay, Amount Undisclosed
John Malone deserves credit for acquiring one of the biggest private islands the real estate market has ever seen. He is the owner of Sampson Cay, which pretty much screams luxury from the moment you arrive. After all, you will be greeted by a number of luxury yachts from the get-go! It used to be open to the public but is now strictly used for family holidays. Malone has amassed a fortune of $7.1 billion.