Premarket Roundup: CarMax, Blue Coat

Among the premarket stories for Thursday, May 28, from AP Financial News:

NEW YORK (AP) — Shares of CarMax Inc. rose Thursday in premarket trading after an analyst upgraded the company and raised his earnings estimates, saying the used car dealer's financing division is looking healthier, and the stock is well-priced for buying.

NEW YORK (AP) — Shares of Blue Coat Systems Inc. tumbled ahead of Thursday's market open after the maker of security hardware and software delayed its fiscal fourth-quarter report.

HARTFORD, Conn. (AP) — An analyst cut his profit estimates for Monsanto Co. Thursday, a day after the agricultural products company said it expects to meet the low end of its fiscal 2009 earnings guidance range.

NEW YORK (AP) — A Goldman Sachs analyst downgraded slot-machine maker Bally Technologies Inc. Thursday, saying there are other companies that provide "better relative value."

HARTFORD, Conn. (AP) — The purchase by Bristow Group Inc. of a stake in a Brazilian helicopter and aviation company will help it expand its base in Brazil, an analyst said Thursday as he raised his profit estimates for the helicopter airlift services company.

NEW YORK (AP) — After a recent rally, shares of Carrizo Oil & Gas Inc. have climbed high enough, said an analyst as he downgraded the stock.

NEW YORK (AP) — China Sunergy Co. Ltd.'s lack of vertical integration will constrain the solar cell maker's margins, said an analyst as he downgraded the company's stock on Thursday.