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ImageLawrence Ellison

The second richest techie in the list is Lawrence Joseph Ellison, co-founder and CEO of the leading software company, Oracle Corporation. Ellison ranks at no. four on the list with a net worth of $22.5 billion. His shares are still worth $300 million.

Sixty-four-year-old Ellison started Oracle Corp in 1977. Two years younger to arch rival Microsoft corp, Oracle went public a day before Microsoft in 1986.

In the past four years, Oracle has racked up 49 acquisitions, including BEA Systems (bought for $8.5 billion in 2008). The company also invested $125 million in Web software outfit Netsuite.

A licensed pilot, Ellison is said to own several unusual aircrafts. Known for his flamboyant lifestyle, Ellison has got a leisure boat built for himself. Chicago native studied physics at University of Chicago, but didn't complete his graduation.