Premarket roundup: Research in Motion, Navistar

Among the premarket stories for Friday, April 3, from AP Financial News:

NEW YORK (AP) _ Shares of Research In Motion Ltd. jumped in premarket trading Friday after the company reported healthy sales of its BlackBerry smart phones fueled fiscal fourth-quarter earnings growth, beating analysts' estimates.

HARTFORD, Conn. (AP) _ Navistar International Corp.'s protest over a contract evaluation process suggests that it is unlikely the company will win a $3 billion military pact, an analyst said Friday as he downgraded the stock.

NEW YORK (AP) _ Whole Foods Market Inc. shares are fairly valued after a surge, an analyst said Friday, as the natural-foods retailer faces sluggish sales, high rents and other challenges.

NEW YORK (AP) _ Allscripts-Misys Healthcare Solutions Inc. cut its revenue forecasts for its current fiscal year, and analyst said Friday that the medical software maker could get less revenue because more of its customers are ordering software with subscriptions.

NEW YORK (AP) _ Some analysts remained fairly positive on Micron Technology Inc. Friday after the chip maker reported that its fiscal second-quarter loss narrowed slightly and said results were pinched by a decline in selling prices.

NEW YORK (AP) _ An analyst downgraded shares of auto dealership chain CarMax Inc. on Friday, saying the company faces numerous challenges following its better-than-expected fourth-quarter earnings statement.

NEW YORK (AP) _ Toy and children's product retailers being cautious about their inventory levels will likely hurt RC2 Corp.'s sales in the first quarter, an analyst said Friday as she downgraded the stock.