Among the companies with shares expected to actively trade in Thursday's session are PVR Partners L.P. (PVR), Teva Pharmaceutical Industries Ltd. (TEVA) and Citrix Systems Inc. (CTXS).

Regency Energy Partners L.P. (RGP) agreed to acquire PVR Partners for about $3.8 billion, creating a significant gas-gathering and processing company focused on unconventional energy plays across the U.S. Regency said its offer is valued at $28.68 per PVR unit, a 26% premium over Wednesday's close. The units surged 18% to $27 premarket.

Teva Pharmaceutical is cutting its workforce by about 10%, accelerating its cost-reduction efforts and joining a wave of downsizing in the drug industry. The cuts will affect about 5,000 employees and will be mostly completed by the end of 2014. American depositary shares edged up 2.9% to $40.35 premarket.

Citrix Systems cut the enterprise software maker's third-quarter sales and profit estimates, which sent shares sharply lower in after-hours trading. The stock slumped 12% to $58.80 in premarket trading. Shares of peer VMware Inc. (VMW) were off 1.4% to $77.85.

IGate Corp.'s (IGTE) third-quarter earnings rose 13% as revenue and margins improved. The provider of outsourcing services saw its results beat expectations, sending shares up 6.4% to $29.36 premarket.

Acura Pharmaceuticals Inc. (ACUR) reached settlement agreements with Par Pharmaceutical and Impax Laboratories to settle the specialty-pharmaceutical company's patent-infringement actions pending against them tied to painkiller Oxecta. Shares surged 24% to $2.09 premarket.

Ruby Tuesday Inc. (RT) reported a surprisingly wide loss in its fiscal first quarter, saying competition and economic headwinds hurt the restaurant operator as it tries to execute a turnaround plan. Shares fell 16% at $6.34 in premarket trading as the results missed expectations and sales at restaurants open more than a year fell sharply.

 
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Alkermes PLC'S (ALKS) investigational treatment for major depressive disorder received fast-track designation from the U.S. Food and Drug Administration. The biopharmaceutical company's once daily treatment--known as ALKS-5461--is earmarked for use for hard-to-treat cases.

Chevron Corp. (CVX) said its third-quarter global oil-and-gas production are expected to rise slightly from the year-ago quarter, though downstream earnings are expected to be "significantly lower."

Crestwood Midstream Partners LP (CMLP) has agreed to acquire privately held Arrow Midstream Holdings LLC for about $750 million, expanding its footprint in the oil-rich Bakken Shale. The deal is expected to close in the fourth quarter and be immediately accretive to Crestwood's distributable cash flow next year.

Destination Maternity Corp. (DEST) raised its earnings expectations for the year, helped by stronger sales in stores open for more than a year. Specialty retailer Cato Corp. (CATO) also said it expects its fiscal third-quarter earnings to come in at the higher end of its prior guidance.

Gilead Sciences Inc. (GILD) said it will stop its Phase 3 study of a treatment for chronic lymphocytic leukemia as interim results have demonstrated significant efficacy for its primary endpoint. The treatment, which is called idelalisib, was being tested for patients not fit for chemotherapy.

Helen of Troy Corp.'s (HELE) fiscal second-quarter earnings rose 1.5% as the personal-care and household-products maker posted an increase in revenue that was offset somewhat by a bigger rise in input costs.

IntercontinentalExchange Inc. (ICE) plans to close its acquisition of NYSE Euronext (NYX) on Nov. 4, completing a roughly $10 billion tie-up of two mega-exchanges. The closing date is predicated on some remaining approvals from European regulators and may be extended.

Private-equity firm KKR & Co. LP (KKR) has agreed to pay about $1 billion to Melrose Industries PLC (MLSPY, MRO.LN) to acquire lifting-equipment companies Crosby Group LLC and Acco Material Handling Solutions.

Men's Wearhouse (MW) has adopted a shareholder-rights plan to prevent new investors from gaining sizable control of the apparel retailer, a move that comes on the day it rejected a $2.3 billion takeover bid by Jos. A. Bank Clothiers Inc. (JOSB).

OmniAmerican Bancorp Inc. (OABC) plans to trim its work force by 8%, job cuts stemming from the bank's plan to discontinue the purchase of auto loans originated through auto dealerships. OmniAmerican also disclosed it eliminated the position of chief operating officer to reduce costs and bolster earnings.

Quest Diagnostics Inc. (DGX) forecast weaker-than-expected results in its third quarter, citing softness in its diagnostic information services business. "Later in the quarter, revenues deteriorated, leading to results that did not meet our expectations," said Chief Executive Steve Rusckowski.

Sirius XM Radio Inc. (SIRI) has increased its share-repurchase program by $2 billion and plans to buy back $500 million of stock from Liberty Media Corp. (LMCA, LMCB), a move to boost returns for the satellite radio company's shareholders. Liberty Media expects to continue to own more than 52% of Sirius's shares after the repurchase.

Vonage Holdings Corp. (VG) has agreed to acquire voice-over-internet-protocol company Vocalocity for $130 million, in a deal aimed at strengthening Vonage's position in the small- and medium-sized business sector. Vonage will pay $105 million in cash and $25 million in stock for a purchase that it sees as "transformative," Chief Executive Marc Lefar said in an interview.

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

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