Among the companies with shares expected to actively trade in Wednesday's session are DSW Inc. (DSW), Toll Brothers Inc. (TOL) and Workday Inc. (WDAY).

Discount shoe retailer DSW slashed its earnings guidance for the year and posted underwhelming results for its fiscal first quarter. The company said rough weather and competitive discounting weighed on its sales for the most recent period. DSW's stock fell 21% to $25.78 in premarket trading.

Propylene maker PetroLogistics L.P. (PDH) agreed to be acquired by a Koch Industries Inc. unit for about $2.1 billion in cash. Flint Hills Resources LLC, the Koch subsidiary, will acquire PetroLogistics common units for $14 each in cash, an 8.3% premium over Tuesday's close. The units climbed 11% to $14.30 premarket.

Toll Brothers said its fiscal second-quarter profit more than doubled as the homebuilder continued to benefit from higher home prices and more deliveries. Shares edged up 3.5% to $36.90 premarket.

Wet Seal Inc. (WSTL) swung to a fiscal first-quarter loss as the women's apparel retailer struggled with a sharp drop in sales. The company had said last month it planned to wind down its Arden B brand as it sought to shore up its namesake brand amid falling sales. Shares dropped 12% to 89 cents premarket.

Workday's first-quarter loss widened as a surge in costs masked higher revenues. The Pleasanton, Calif., enterprise-software company raised its revenue outlook for the year and gave a strong top-line view for the current quarter, sending shares up 4.7% to $85.96 premarket.

 
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Valeant Pharmaceuticals International Inc. (VRX) on Wednesday said it raised its offer to buy Botox maker Allergan Inc. (AGN), increasing the cash portion of its bid and lifting its overall value to more than $49 billion.

Brown Shoe Co. (BWS) swung to a fiscal first-quarter profit as its Famous Footwear chain and wholesale business both posted improved sales. The bottom line slightly beat expectations.

Chico's FAS Inc. (CHS) said its fiscal first-quarter profit declined 22% as the women's apparel retailer reported higher costs and expenses, which offset a slight increase in sales. Earnings missed expectations.

Cliffs Natural Resources Inc. (CLF) said it is further cutting its expected capital spending range for the year by 25% as the mining company continues reining in costs.

Cracker Barrel Old Country Store Inc. (CBRL) said its fiscal third-quarter earnings grew 17% as the restaurant operator lowered costs and posted a slight increase in revenue. Earnings came in at the high end of the company's reduced range.

FormFactor Inc. (FORM) raised its revenue guidance for the second quarter, pointing to strong demand across its system-on-chip and dynamic random access memory segments.

GlaxoSmithKline PLC (GSK) is being investigated by the U.K.'s Serious Fraud Office for possible criminal violations in its commercial practices, the pharmaceutical company said. The company said it is cooperating with investigators.

MasterCard (MA) on Wednesday said it has taken steps to boost security for its cardholders, a move that comes amid several recent data breaches at high-profile companies. MasterCard said all of its credit, debit, prepaid and small-business cards issued in the U.S. will now come with the company's identity theft resolution assistance.

Michael Kors Holdings Ltd. (KORS) said its fiscal fourth-quarter profit surged 59% as the retailer posted a robust rise in sales across regions. Results easily topped the company's own expectations.

Nasdaq OMX Group Inc. (NDAQ) said its private-market unit formed a six-member board of advisers and expects to appoint additional members over the next few months. Nasdaq Private Market is the company's latest attempt to break into pre-IPO trading.

Spectranetics Corp. (SPNC) agreed to acquire privately held AngioScore Inc. for $230 million in cash and stock, as well as potential milestone payments. The combined entity will focus on cardiovascular challenges in the peripheral and coronary markets.

Volcano Corp. (VOLC) agreed to acquire AtheroMed Inc. for an initial $115 million cash payment, gaining access to the privately held company's Phoenix Atherectomy System to treat peripheral artery disease. AtheroMed could also receive milestone payments related to a Phoenix device being considered by the Food and Drug Administration.

Westlake Chemical Corp. (WLK) said Wednesday that it will acquire Germany-based Vinnolit Holdings GmbH for 490 million euros (about $667 million) from private equity firm Advent International. Vinnolit, which produces specialty polyvinyl chloride, or PVC, resins, has six production facilities in Germany and the U.K.

Write to Maria Armental at maria.armental@wsj.com

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