Miller Tabak upgraded the stock Monday and Gabelli also reiterated its bullish view on the shares.

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David Joyce, an analyst at Miller Tabak, said XM's sales were better than he had expected because of the decline in family plan subscribers.

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Miller Tabak analyst Les Funtleyder isn't surprised by Bristol-Myers' response, but he dislikes that ImClone revealed the masked suitor's offer without first discussing it with Bristol-Myers privately.

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Miller Tabak analyst Les Funtleyder said it would be more likely for a newly cancer-centric Pfizer to be the bidder, but for now, Lilly is in the spotlight.

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"This has really shaken up many people's attitudes toward the Bank of Japan and the new government, " said Andrew Wilkinson, chief economic strategist at Miller Tabak and Co in New York.

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"Japanese investors returned from Golden Week national holidays in buoyant mood, bidding stocks in the Nikkei 225 average to their highest since mid-2008, " said Andrew Wilkinson, chief economic strategist at Miller Tabak.

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Les Funtleyder, a fund manager at Miller, Tabak, says that the the stock, which his fund holds, could perform well partly because Lipitor sales may decline more slowly than investors expect, allowing Pfizer to beat earnings expectations.

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