Among the companies with shares expected to actively trade in Thursday's session are Potbelly Corp. (PBPB), Tractor Supply (TSCO) and Zumiez Inc. (ZUMZ).

Axiall Corp. (AXLL) said it expects to post a sharp drop in income for the second quarter after a manufacturing facility in Louisiana was damaged in a fire in December. Shares of the chemicals and building products company declined 5.4% to $45 premarket.

Kosmos Energy Ltd. (KOS) said funds affiliated with Blackstone Group L.P. (BX) and Warburg Pincus LLC have agreed to sell an 17 million shares of the oil and gas exploration company. Shares dropped 8.9% to $9.68 premarket.

Liquidity Services Inc. (LQDT) said it would cease the sale of some assets under its contract with the U.S. defense department while the contract is under review. The online auctioneer said the move will soften its third-quarter earnings outlook, pushing its shares down about 5% in recent premarket trading.

Lumber Liquidators Holdings Inc. (LL) warned customer traffic in the second quarter was significantly weaker than expected and lowered its financial guidance for the year. Shares declined 4.6% to $14 in light premarket trading.

Potbelly warned of weaker-than-expected sales in its second quarter as the sandwich chain lowered its outlook for the year and said it will test a number of new marketing, menu and operational tactics in the second half. Shares dropped 17% to $12.20 premarket.

Regado Biosciences Inc. (RGDO) said it was notified that the U.S. Food and Drug Administration placed a clinical hold on a phase III trial of its Revolixys system. Shares dropped 2.6% to $2.63 premarket.

Tractor Supply, the largest U.S. chain of farm and ranch stores, warned that its results for the year will probably be at the lower end of its projections, based on weaker results for the second quarter. Shares fell 4.6% to $58.55 premarket.

Zumiez raised its fiscal second-quarter guidance on its better-than-anticipated June sales results. Shares rose 8.9% to $30.48 premarket.

 
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Allergan Inc. (AGN) Chief Executive David Pyott says he is looking at potential sizable acquisitions, at the urging of his shareholders, as he seeks to fight off a $53 billion hostile offer from Valeant Pharmaceuticals International Inc. (VRX) and activist investor William Ackman.

Cal-Maine Foods Inc. (CALM) said its fresh egg sales totaled about 1.014 billion dozen eggs in its recently completed fiscal year, calling it a record for any supplier.

Family Dollar Stores Inc. (FDO) said it will take additional steps to improve its profits, after its fiscal-third quarter profit slid 33%. "Our results continue to reflect the economic challenges facing our core customer and an intense competitive environment," said Chief Executive Howard Levine, adding sales have remained below expectations.

General Cable Corp. (BGC), which makes copper, aluminum and fiver optic wire, said it will cut about 7% of its workforce and close down some plants as part of a restructuring, and it lowered its outlook for operating income for the year.

Helen of Troy Corp. (HELE) said its fiscal first-quarter earnings rose 14% on sales growth in the company's housewares and healthcare/home environment businesses.

Republic Airways Holdings Inc. (RJET) raised its second-quarter earnings guidance and pretax margin view as the regional carrier reported that passenger traffic rose 16% from a year earlier.

Health-care real-estate investment trust Ventas Inc. (VTR) said its chief accounting officer, Robert Brehl, had separated from the company and that it had dismissed Ernst & Young as the company's auditor "as a result of an inappropriate personal relationship" between an Ernst & Young partner and the chief accounting officer.

WD-40 Co. (WDFC) reported a smaller-than-expected increase in third-quarter sales, hurt by a decline in its Americas segment.

Write to Maria Armental and Lauren Pollock at maria.armental@wsj.com

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