Among the companies with shares expected to actively trade in Tuesday's session are Impax Laboratories Inc. (IPXL), Ascena Retail Group Inc. (ASNA) and Santarus Inc. (SNTS).

Impax said Food and Drug Administration inspectors have found continuing problems at its Hayward, Calif., manufacturing facility that may affect new and pending drug applications. Shares tumbled 20% to $16 in premarket trading.

Ascena's fiscal second-quarter earnings fell less than analysts expected and the women's apparel retailer also stood pat on its full-year guidance. "Between core businesses finally stabilizing and accretion from the new divisions, [Ascena] could be one of the more compelling stories in our space," FBR said, raising per-share earnings estimates. Shares rose 13% in premarket trading.

Santarus's fourth-quarter earnings nearly tripled as the specialty biopharmaceutical company reported double-digit revenue growth and also provided upbeat earnings guidance for the current year. Shares climbed 8.7% to $15 premarket.

Vornado Realty Trust (VNO) moved to dump more than 40% of its holdings in department store chain J.C. Penney Co.(JCP), cutting its losses on a drastic and failing turnaround that the activist investor helped spark. J.C. Penney shares were off 2.9% to $16.25 premarket.

Energy company Williams Partners L.P. (WPZ) plans to offer 10 million units representing limited-partner interests. At the same time, the company will sell three million units to affiliate Williams Cos. (WMB) in a private placement. Williams Partners expects to have 411 million units outstanding after the offering, and plans to use the proceeds to pay down debt. Units dropped 3.3% to $48.88 premarket.

Quinpario Partners LLC reported a 10% stake in Zoltek Cos. (ZOLT) and is seeking to remove all of the company's directors, saying the carbon fibers manufacturer has significantly underperformed both commercially and financially. Shares were up 9.7% to $10.15 premarket.

 
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ABM Industries Inc.'s (ABM) fiscal first-quarter earnings climbed 26% as recent acquisitions helped boost the facility-services contractor's revenue and as it recorded a smaller tax provision. Results topped analyst expectations.

Electrical-product maker AZZ Inc. (AZZ) said Chief Executive David H. Dingus has been diagnosed with pancreatic cancer and will undergo aggressive treatment starting this week.

Casella Waste Systems Inc.'s (CWST) fiscal third-quarter loss narrowed as charges related to an investment weighed on the waste-management company's year-ago results, although revenue was relatively flat in the latest period.

Coinstar Inc. (CSTR) said it plans to privately offer $300 million in senior unsecured notes due 2019 and will use proceeds for general corporate purposes.

K12 Inc. (LRN) has agreed to a $6.75 million payment by its insurance carriers to settle allegations that the online education company didn't properly disclose student enrollment and retention data.

Leggett & Platt Inc. (LEG) said its Chief Operating Officer Karl Glassman will take on the additional title of president and said it expects Chief Executive David Haffner to be elected chairman at the diversified manufacturer's board meeting in May.

MRC Global Inc. (MRC) said its biggest stockholder, PVF Holdings LLC, has launched an offering of 17 million shares. The company, which distributes pipes, valves and fittings to the energy and industrial sectors, had 101.6 million shares outstanding as of Feb. 27.

Fitch Ratings upgraded Pioneer Natural Resources Co. (PXD) a notch to investment grade, noting the energy company's production growth and strong reserves.

Moody's Investors Service lowered its rating on RadioShack Corp. (RSH) one notch further into junk territory, pointing to the consumer-electronics retailer's steep decline in operating performance and profitability.

SHFL Entertainment Inc.'s (SHFL) fiscal first-quarter profit fell 7.6% as the casino-games company reported higher costs related to growth and litigation, masking revenue growth.

Write to Mia Lamar at mia.lamar@dowjones.com

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