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ImagePaul Allen

At no. 32 is Paul Gardner Allen who co-founded Microsoft Corp with Bill Gates in 1975. His net worth is estimated at $10.5 billion.

Allen left Microsoft in 1983 after he being diagnosed by Hodgkin's disease. Microsoft now makes up 25% of his net worth. Among the biggest billionaire losers in the list, Allen has seen his fortune erode by almost 65% in the last 12 months. Allen also lost big on investments in Charter Communications, a US-based cable company, which is expected to file for bankruptcy.

Allen's investment portfolio includes large stakes in DreamWorks Animation SKG, Digeo, Oxygen Media, real estate holdings and more than 40 other technology, media and content companies.

Fifty-six-year old Allen also owns two professional sports teams: The Seattle Seahawks of the National Football League and the Portland Trail Blazers of the National Basketball Association.