Increasing sentiment in what may turn out to be RIM's Alamo is definitely notable; however, a $600 million swing in market cap...? That seems to be pushing it.
A more likely explanation for the sharp move higher: a short percentage which has been near 20% and bored traders looking for a liquid stock on Thursday while the U.S. stock market was closed. Also consider that RIM shares have nearly doubled since marking a 52-week low at $6.22 in September.
As is wise advice for any bargain shopper on Black Friday: buyer beware.
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