NEW YORK ( TheStreet) -- Drugstore chain Walgreen ( WAG) reported third-quarter profit of 65 cents a share vs. the average analyst estimate of 63 cents a share. The company also announced that its contract renewal negotiations with pharmacy benefit manager Express Scripts ( ESRX) were unsuccessful. Shares were tumbling 4.4% to $43.20 in premarket trading Tuesday.

Bookstore Barnes & Noble ( BKS) is expected to report a fourth-quarter loss of 91 cents a share before the markets open on Tuesday. Shares were popping 7.3% to $21.60.

Natural gas producer EnCana ( ECA) saw its shares tumble 3.7% to $29 after announcing that it and PetroChina ( PTR) ended talks for a proposed joint venture regarding Encana's Cutbank Ridge assets after being unable to reach an agreement.

Nokia ( NOK), the Finnish mobile phone maker, said Tuesday it plans to launch its first Windows-based smartphones later in 2011. Shares were rising 2.1% to $5.97.

Conglomerate General Electric ( GE) and Chinese battery and automobile maker BYD are benefiting from Japan's nuclear crisis, which has increased demand for the types of energy-efficient LED and power packs these companies can produce, Bloomberg reported. The report says GE and BYD are now going up against Japan-based electric companies such as Toshiba and Panasonic ( PC) to gain market share in the country's $120 billion electric appliance market. GE shares were up 0.5% to $18.58.

Drug company AstraZeneca ( AZN) is close to selling its Swedish health care and dental unit Astra Tech to dental products company Dentsply International ( XRAY) in a deal worth about $1.8 billion, according to reports. AstraZeneca shares were unchanged at $49.27.

Cruise company Carnival ( CCL) is expected to report second-quarter profit of 23 cents a share Tuesday. Shares were trading sideways at $35.72.

Software maker Adobe ( ADBE) is expected to post second-quarter earnings of 51 cents a share.

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-- Written by Andrea Tse in New York.

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