Monday's Winners & Losers: Biosite

Shares of Biosite(BSTE Quote) were among the Nasdaq's winners Monday, soaring 52% after the medical-diagnostics company agreed to be acquired by Beckman Coulter(BEC Quote) for about $1.55 billion in cash.

Biosite holders will receive $85 a share, a 53% premium to the stock's closing price of $55.38 Friday. The deal, projected to close in the second quarter, is expected to be accretive to Beckman Coulter's 2008 earnings. Shares of Biosite were up $28.62 to $84, while shares of Beckman Coulter were falling $4.22, or 6%, to $62.86.

Tiffany(TIF Quote) fell modestly even after the specialty retailer posted better-than-expected fourth-quarter results. For the period ended Jan. 31, the company earned $140.5 million, or $1.02 a share, on revenue of $986.4 million. Excluding an impairment charge, earnings were $1.07 a share. Analysts polled by Thomson Financial expected earnings of $1.05 a share, with revenue of $979.1 million. During the year-earlier period, Tiffany earned $140.3 million, or 97 cents a share, on revenue of $858.4 million.

Looking ahead, Tiffany expects earnings per share for the current year to rise 15%, with revenue growth of 11% to 12%. For the current first quarter, Tiffany said that earnings are "on track" to meet the company's expectations. Shares were trading down 24 cents to $45.26.

Walgreen(WAG Quote) shares traded actively after the drugstore chain's second-quarter results topped estimates. For the quarter ended Feb. 28, the company earned $651.9 million, or 65 cents a share, on revenue of $13.93 billion. Analysts expected earnings of 61 cents a share and revenue of $13.89 billion. A year earlier, Walgreen earned $523.5 million, or 51 cents a share, on revenue of $12.16 billion. Shares were down 9 cents to $47.68.