Investing Your Way onto the Rich List 2011

Most of the multi millionaires and billionaires on the Rich List 2011 made their money through successful businesses in a variety of different industries.
Is it possible, however, to get onto the list by being an investor?
Warren Buffett, who has often been the richest man in the world, is often considered to be the world's greatest investor too. He made a majority of his wealth via investing in the stock market and investing in whole companies. For the UK Rich List, there's also a range of billionaires and multi millionaires who made their money from investments. The Duke of Westminster, Gerald Cavendish Grosvenor, made his wealth from a number of property investments in the United Kingdom and the world. He also manages properties worldwide through his property group, Grosvenor. He even had unique investments, including a 100 year old yacht, which he spent seven years and 6 million pounds for restoration, before selling it for a profit.