Bear Stearns (NYSE:BSC) shares rose marginally after a British billionaire disclosed a 9.57 percent stake in the firm even as shares continue to fall. Joseph Lewis, the 486th richest person in the world, has acquired almost two million more shares of the investment bank as a part of an option strategy that appears to be backfiring. Shareholders are hoping that the billionaire investor will hold on to the stock and take some action to unlock value in the company’s shares.

Lewis became the Bear Stearn’s largest shareholder in September after the firm’s two hedge fund collapsed due to bad bets on mortgage-backed securities. The billionaire spent nearly $860 million to buy 7% of the company when the stock was trading at more than $100 a share, which means he was already sitting on a paper-loss of more than $100 million. Now, Lewis appears to have been forced to acquire $1.19 billion in additional shares at an average price of $107.31 a piece, which will likely further extend his losses.

Bear Stearns has been hit particularly hard by the mortgage downturn with a fourth quarter net loss of $854 million on write-downs of $1.9 billion on its portfolio of residential mortgages and related assets. Meanwhile, many analysts are not even sure that the pain is over in the mortgage markets. Many prime mortgages are due to reset to higher rates and default rates among those borrowers are also expected to rise. The economy is also on uncertain ground, and any general slowdown could affect investment banking business.

In the end, shareholders are hoping that the billionaire will do something to help the company turn itself around. Bear Stearns is in a world of hurt now and it appears that this billionaire is too. Combined, these factors make BSC a stock worth watching closely!

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