Bill Gates is currently estimated to be worth approximated $40 billion, that is $40,000,000,000. His investments include Microsoft (of course), Corbis, bgC3 and Cascade Investments LLC.
Bill Gates estimated wealth in 2009 was fifty six billion dollars. He invests his money in many companies including- obviously- Microsoft. His investments are managed through his private investment firm Cascade Investment LLC. Also, a vast portion of his wealth goes to the Bill and Melinda Gates Foundation, which donates to start-ups and charitable causes around the world.