Alumina Limitedの内部者の所有権は19.39%です。
管理の所有権(Insider Ownership)は、発行済株式総数で除したインサイダー（5％超を所有する株主または取締役または役員) が所有する株式総数によって計算されます。
A high value of insider ownership means that those working for the company have a large stake in the success of the company. This is sometimes seen as a sign that those running the company will work hard to ensure its success or believe the company's stock price will rise.
A change in insider ownership may come from exercise of option, stock grant and buying or selling of company shares. A purchase of company share signifies a confidence in the company's future performance by people who know the company best. Therefore, Net Insider buying is also an important indicator for investors.
Alumina Limited, through its 40% interest in Alcoa World Alumina and Chemicals, engages in bauxite mining, alumina refining, and aluminum smelting businesses. The company has a network of bauxite mines and alumina refineries in Australia, Guinea, Brazil, and Spain, and Saudi Arabia; and a 55% interest in the Portland aluminium smelter in Victoria, Australia. It is also involved in shipping operations. The company was formerly known as WMC Limited and changed its name to Alumina Limited in December 2002 as part of the demerger of the WMC Group. Alumina Limited was incorporated in 1970 and is headquartered in Southbank, Australia.