Premarket Roundup: Quidel, AnnTaylor

Among the premarket stories for Friday, Sept. 11, from AP Financial News:

NEW YORK (AP) — Shares of Quidel Corp., which makes flu tests, jumped in premarket trading Friday following the company's announcement that operating income and revenue in the third-quarter will beat analyst expectations.

NEW YORK (AP) — AnnTaylor Stores Corp.'s customers are starting to shop again, merchandise is improving and cost controls are boosting profit margins, an FBR Capital Markets analyst said, boosting her investment opinion on the women's retailer to the firm's top rating.

NEW YORK (AP) — A Craig-Hallum Capital analyst upgraded shares of Edwards Lifesciences Corp. saying the heart device maker's core surgical franchise will continue making progress.

NEW YORK (AP) — Electronics retailer Best Buy's shares are trading near the top of their 52-week range, an Oppenheimer analyst said Friday, and downgraded the company based on valuation and the potential for continued weak sales.

NEW YORK (AP) — Nokia Corp.'s new phones look good, but world's No. 1 cell phone maker is still likely to lose market share in the view of an analyst at Robert W. Baird & Co., who downgraded the company's stock Friday morning.

NEW YORK (AP) — Avery Dennison Corp. is cutting costs, reducing debt and improving cash flow, an analyst said Friday as he upgraded shares of the adhesive label maker and office supplies provider.