Among the companies with shares expected to actively trade in Thursday's session are Men's Wearhouse Inc.'s (MW), Pandora Media Inc. (P), Lululemon Athletica inc. (LULU) and Weatherford International Ltd. (WFT).

Men's Wearhouse's fiscal second-quarter earnings fell 28% as the apparel retailer's results were hurt by several one-time charges and a shift in quarterly tuxedo rental revenue. Results missed analyst expectations and the company lowered its full-year guidance. Shares fell 14% to $33.50 premarket.

Lululemon Athletica Inc.'s (LULU) fiscal second-quarter profit edged down 1.3% as the maker of high-end yoga gear grappled with higher input costs, outweighing a solid jump in revenue. The company cut its guidance for the fiscal year and offered a weak view for the current quarter. Shares were down 7.1% at 64.12.

Weatherford International Ltd.'s (WFT) Chief Financial Officer John H. Briscoe resigned effective Thursday, just 19 months after being promoted to the post and barely two years after joining the oil-field services company. After talking with company officials, Sterne Agee said it appears Weatherford, "is seeking an individual with a different skill set...including expertise in asset divestitures and corporate strategy. Interestingly, it appears [Weatherford] is moving past the 'fixing' stage of its turnaround and to a stage with more strategic maneuvers." Shares fell 5.7% to $14.85 premarket.

Sterling Financial Corp. (STSA) announced it will merge with Oregon lender Umpqua Holdings Corp. (UMPQ) in a deal valued at about $2 billion, one of the largest bank transactions announced this year. The deal will form one of the largest community banks on the West Coast, with $22 billion in assets and nearly 400 branches in five states. Sterling Financial shares were up 12% at $29.86 premarket.

Extreme Networks Inc. (EXTR) said it agreed to buy privately held Enterasys Networks Inc. for $180 million in cash as the company looks to expand the capabilities of its network operating systems. The deal is also expected to result in revenue double that of either company alone, as well as in increased investment in greater research and development. Shares were up 13% to $4.55.

Halcon Resources Corp. (HK) entered into three separate deals to divest itself of some noncore assets throughout the U.S. for about $302 million, giving the oil and natural gas producer additional liquidity. Shares were up 3% at $5.08.

Glu Mobile Inc. (GLUU), a developer and publisher of games for smartphones and tablets, unveiled a plan to offer stock to raise proceeds for working capital and general corporate purposes. Shares were down 7.9% at $2.22 premarket.

Linn Energy LLC (LINE) and LinnCo LLC (LNCO) said they have reached a deal to buy oil and natural gas properties in the Permian Basin for $525 million. Line Energy shares were up 3.2% to $28.80.

Oclaro Inc. (OCLR) sold its Switzerland-based semiconductor laser business and related assets to II-VI Inc. (IIVI) for $115 million, allowing the optical-components maker to move forward with its restructuring plans. II-VI, a maker of engineered materials and optoelectronic components, also paid $5 million for an exclusive option, which expires in 30 days, to buy Oclaro's optical amplifier and micro-optics business for $88 million. Oclaro shares rose 42% to $1.50 premarket.

Pandora Media Inc. (P) named Brian McAndrews, a former aQuantive and Microsoft Corp. (MSFT) executive, as its chief executive and chairman, a move that comes six months after Joe Kennedy said he would be stepping down from the Internet-radio firm's helm. Shares rose 7.2% to $22.91 premarket.

SeaWorld Entertainment Inc. (SEAS) said revenue and admissions through August in the current fiscal year have risen from year-earlier levels, growing during the critical summer season despite some challenging weather conditions. Shares rose 5.9% to $30.33 premarket.

Vera Bradley Inc. (VRA) reported its fiscal second-quarter earnings rose 12% as the handbag designer's revenue was boosted by recent store openings, but same-store sales sank and the company sharply cut its full-year outlook. Shares fell 11% to $17.35 premarket.

 
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Activist investment firm Engaged Capital LLC has withdrawn its nomination for a director to AeroVironment Inc.'s (AVAV) board and plans to withhold its votes for all three of the company's board nominees. In a letter to AeroVironment's board, Engaged Capital said it is "extremely disappointed" with the way its interactions with the company--a maker of pilotless drones for the military and rechargeable-battery technology for electric vehicles--have progressed over the past several months.

Bristol-Myers Squibb Co. (BMY) on Thursday said its test to determine if its Yervoy skin-cancer drug can be used to treat prostate cancer didn't achieve its primary endpoint in a late-stage trial.

Dunkin' Brands Group Inc. (DNKN) has signed a deal to take its eponymous donut restaurants to London, as the company continues its push to expand internationally.

Encana Corp. (ECA), North America's third largest natural-gas producer, said a review of its assets has identified a number of areas "where significant changes are required to be successful." Calgary, Alberta-based Encana, which tasked internal and external advisers earlier this year to review its operations, has been grappling with slumping natural-gas prices which have hurt profits.

Qualcomm Inc.'s (QCOM) board authorized a new $5 billion share-buyback program, replacing a prior program valued at same amount that the chip maker unveiled in March but didn't fully complete.

Vertex Pharmaceuticals Inc. (VRTX) and Ametek Inc. (AME) will join the S&P 500 index, replacing Advanced Micro Devices Inc. (AMD) and SAIC Inc. (SAI), said S&P Dow Jones Indices. The changes will occur after the close of trading on Sept. 20.

Write to Tess Stynes at tess.stynes@wsj.com

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