2012 net worth: $11.9 billion
2011 net worth: $10.1 billion
The Russian-American industrialist had a fantastic 2011, buying Warner Music for $3.3 billion this summer—an asset that has already appreciated based on the sale price of EMI for $4.1 billion months later. Stakes in other companies, including chemical maker LyondellBasell and Russian oil company TNK-BP, continued to pad his fortune.
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