Among the companies with shares expected to actively trade in Friday's session are Gap Inc. (GPS), Pain Therapeutics Inc. (PTIE) and Air Lease Corp (AL).

Gap issued fiscal first-quarter projections that beat consensus estimates, while reporting same-store sales for April that were stronger than expected. Shares rose 4.5% to $40.56 in premarket trading.

Pain Therapeutics said Pfizer Inc. (PFE) is evaluating its continued participation in the development of the pain-medicine candidate Remoxy and doesn't know when a final decision will be made. Shares of Pain Therapeutics dropped 50% to $2.82 premarket as the developed of novel drugs released a letter from Pfizer in which the drug maker said it is reassessing its endorsement of the Remoxy program due to the "years of delay, additional cost incurred to bring the program to this point and development work left in the program."

A public stock offering by 3D Systems Corp. (DDD) priced at a discount to Thursday's close. The 7.5 million offering priced at a 7% discount, at $40 a share. The three-dimensional-printer maker's shares fell 6.5% to $40.20 premarket.

Air Lease's first-quarter earnings rose 49% as the jet-leasing company recorded higher revenue from the rental of flight equipment. Shares fell 8% premarket to $28.15 as the company's earnings met analyst expectations but revenue fell short.

Ubiquiti Networks Inc.'s (UBNT) fiscal third-quarter earnings fell 26% as the Internet-gear manufacturer reported weaker systems revenue that was further pressured by higher operating expenses. Shares jumped 20% to $19.28 premarket as the company issued upbeat guidance for the current period.

 
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Air Methods Corp. (AIRM) swung to a first-quarter loss as the provider of emergency medical transport services was hurt in part by bad weather.

Allscripts Healthcare Solutions Inc. (MDRX) swung to a surprise first-quarter loss amid restructuring-related charges, acquisition-related impacts and other items while the electronic health-records company also reported weaker revenue. Adjusted earnings and revenue missed expectations.

Apollo Global Management LLC (APO) said its public offering of about 21.1 million Class A shares owned by two co-founders and some key investors will price at $25 a share.

Erickson Air-Crane Inc.'s (EAC) first-quarter loss narrowed as the company posted stronger sales in its larger segment, and the year-ago period saw a large dividend payout. However, adjusted earnings significantly topped consensus estimates.

Molycorp Inc.'s (MCP) first-quarter loss widened sharply as languid prices for the mining company's rare-earth products and the high cost of production weighed on results, but revenue jumped, exceeding Street expectations.

Priceline.com Inc.'s (PCLN) earnings grew 34% as the online-travel agent delivered a typically better-than-predicted quarter, supported by a new way of booking at its namesake brand and expansion in emerging markets. But the market was unsettled by Priceline's outlook, which predicted stable growth but still fell short of expectations.

ServiceSource International Inc.'s (SREV) first-quarter loss expanded on higher costs and expenses, as well as income-tax provisions, but adjusted results topped consensus estimates.

Write to Anna Prior at anna.prior@dowjones.com

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