According to Jewish Billionaires Worth $812 Billion, Forbes Israel Reports Haaretz 2013
> The 165 Jewish billionaires around the world have $812 billion in joint wealth, Forbes Israel reported on Thursday.
So, according to Forbes, who made the list of 1,426, billionaires, 165 are Jewish.
165/1426 = 11.6%
A more-primary source is from Forbes Israel itself דירוג המיליארדרים של פורבס: היהודים העשירים בעולם. This article gives a specific list of who particularly they consider to be the 165 Jewish billionaires of the 1426.
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