RIM Chiefs Lose Billionaire Status as Stock Drops on Lower Sales

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Jim Balsillie and Mike Lazaridis, Research In Motion Ltd.’s largest shareholders and co-chief executive officers, have lost their status as billionaires from the stock this year as it has shed more than half its value.

The executives, who each own about 5 percent of the BlackBerry maker, had the value of their stakes drop to about $640 million yesterday from about $1.9 billion in February.