Among the companies with shares expected to actively trade in Friday's session are Forest Oil Corp. (FST), Discovery Laboratories Inc. (DSCO) and Xyratex Ltd. (XRTX).

Forest Oil disclosed it agreed to sell its Texas Panhandle assets for $1 billion. The stock climbed 9.5% to $6.95 in premarket trading as the oil and gas producer said it expects to use proceeds from the sale to primarily reduce debt and bolster financial flexibility.

Discovery Labs surged premarket as the Food & Drug Administration approved a specification update for Surfaxin, clearing the way for the product's sale after delays in getting to market a drug to prevent respiratory-distress syndrome in premature infants. In April, the FDA wanted clarifications and gave recommendations to Discovery. Surfaxin, which received FDA approval in March 2012, was slated to first become available this past spring. Production has now begun and Discovery expects sales to start before year's end. Shares soared 61% to $3.18.

Xyratex's fiscal third-quarter earnings fell 70% on a double-digit revenue decline mostly related to a continued reduction in revenue from NetApp Inc. (NTAP). Shares were down 7.4% at $11.11 in light premarket trading as the company also gave a mostly downbeat outlook for the current quarter.

Union Pacific Corp. (UNP) issued third-quarter earnings and revenue targets that fell short of Wall Street's expectations, as the railroad operator said mild weather and an uncertain economic environment led to flat volumes. Shares of Union Pacific fell 1.2% to $153.50 premarket. Peers CSX Corp. (CSX) and Norfolk Southern Corp. (NSC) were also trading lower.

Lannett Co. (LCI) said an offering of 5.87 million of its shares priced at a 14% discount to Thursday's close. The offering includes 4.25 million shares offered by the company and 1.62 million on behalf of selling shareholders. The generic pharmaceutical maker intends to use proceeds for general corporate purposes. Lannett recently had about 28.7 million shares outstanding, according to FactSet. Shares fell 13% to $18.19 in premarket trading.

NeoStem Inc. (NBS) said its offering of five million shares priced at an 11% discount to Thursday's close. The company intends to use the proceeds for working capital, including research and development of cell therapeutic product candidates, expansion of business units, strategic transaction and other general corporate purposes. NeoStem recently had about 20.3 million shares outstanding, according to FactSet. Shares fell 11% to $7 premarket.

Delcath Systems Inc. (DCTH) said it has cut about one-third of its workforce to cut costs, just three weeks after the pharmaceutical and medical-device company fired its chief executive and created a committee to explore strategic options. Shares dropped 15% to 44 cents in premarket trading.

 
   Watch List: 
 

Comtech Telecommunications Corp.'s (CMTL) fiscal fourth-quarter earnings fell 35% as the maker of advanced communication systems posted sales declines throughout its operations. However, per-share earnings beat analyst expectations and the company recorded its highest quarterly bookings number for the year.

Pfizer Inc. (PFE) said the Food and Drug Administration approved its Duavee treatment for moderate to severe hot flashes and to prevent post-menopausal osteoporosis in women. The drug was developed by Pfizer's Wyeth Pharmaceuticals unit as part of a broader collaboration with Ligand Pharmaceuticals Inc. (LGND).

Fabless semiconductor company Silicon Motion Technology Corp. (SIMO) said revenue for the third quarter will be at the lower end of its prior expectations, though adjusted margins are expected to be within the upper half of its guidance.

Write to Lauren Pollock at lauren.pollock@wsj.com

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