Among the companies with shares expected to actively trade in Thursday's session are Wal-Mart Stores Inc. (WMT), NetApp Inc. (NTAP) and Diamond Foods Inc. (DMND).

Wal-Mart reported a mixed fiscal third quarter, with earnings that were at the high end of its forecast but revenue growth below expectations. Same-store sales at the world's largest retailer were well short of estimates, sending shares down 3% to $69.20 in premarket trade.

NetApp posted a smaller-than-feared drop in quarterly earnings as revenue improved even in hard-hit Europe, suggesting the data-storage maker's top line may be poised to re-accelerate. Its current-quarter projections also came in better than expected. Shares jumped 12% to $30.24 premarket.

Diamond Foods said it closed the book on the walnut-accounting scandal that dogged the maker of snack foods during the past year, but opened a new chapter of struggles related to securing enough walnuts for its business and righting some of its other businesses. Diamond late Wednesday disclosed restated financial results tied to the accounting scandal and showed that it swung to a loss during the first three quarters of 2012 as it took significant charges related to its investigation. Shares slumped 22% to $15.20 premarket.

Tranzyme Inc. (TZYM) reported negative preliminary results from the first of two trials assessing its treatment for diabetic patients with a common stomach complication. Shares tumbled 47% to $2.10 premarket.

PetSmart Inc.'s (PETM) fiscal third-quarter profit grew a better-than-expected 47%, as the specialty pet store's same-store sales and margins continued to improve. Shares rose 4.9% to $68.01 premarket after the company again raised its earnings guidance for the year.

Shares of AK Steel Holding Corp. (AKS) fell 4.5% to $3.84 premarket amid pending stock-and-bond sales that include boosting the amount of stock outstanding by more than 20%. Wells Fargo analysts, however, noted the sales will give the steelmaker roughly $1.2 billion of liquidity, "adequate enough to ride out a choppy macro and fund forays into iron-ore/coal mining to improve the cost structure."

AspenBio Pharma Inc.'s (APPY) offering of 1.5 million shares priced at $2.10 each, a 15% discount to its Wednesday closing price. The diagnostic-product developer had 7.7 million shares outstanding as of Nov. 6. Shares fell 15% to $2.09 premarket.

DryShips Inc. (DRYS) swung to a worse-than-expected third-quarter loss as the dry bulk shipper saw sharply higher drilling rigs operating expenses, masking modest revenue growth. Shares sank 5.3% to $1.97 premarket.

Velti PLC (VELT) swung to a third-quarter loss on heavy one-off expenses and operating costs, masking an increase in revenue. Shares plummeted 27% to $4.92 as the bottom-line results sharply missed Street expectations.

 
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Agilent Technologies Inc. (A) named Chief Operating Officer Ron Nersesian as its new president, effective immediately, as Chief Executive William Sullivan relinquishes the president title.

Groupon (GRPN) named a new chief operating officer for the daily coupon service Wednesday, elevating Kal Raman to the position as the company seeks to reshape itself and regain investor confidence.

Hot Topic Inc.'s (HOTT) fiscal third-quarter earnings rose 38% as the teen-apparel retailer reported stronger sales and margins.

Limited Brands Inc.'s (LTD) fiscal third-quarter profit fell 22% on lower sales and as a tax benefit boosted year-earlier results. The retailer raised its earnings projection for the full year.

Defense contractor Lockheed Martin Corp. (LMT) is offering up to $3.4 billion of outstanding debt in exchange for notes due 2042 and an additional cash amount.

NetEase Inc.'s (NTES, K3MD.SG) third-quarter earnings edged down 1.7% as the Internet company's revenue from online games slipped and it boosted promotional activities.

Moody's Investors Service has lowered its long-term debt ratings of mail and document services company Pitney Bowes Inc. (PBI) one notch closer to junk territory, citing concerns for its North American and international mailing businesses and a weak macroeconomic environment.

RLI Corp. (RLI) is paying a special dividend of $5 a share as the specialty insurer seeks to boost shareholder returns. The company also said it expects losses from superstorm Sandy to reach $15 million to $20 million, before taxes.

Spectrum Brands Holdings Inc. (SPB) swung to a fiscal fourth-quarter profit as an impairment charge weighed on the consumer-products company's year-earlier results, though sales in its largest segment slipped. Adjusted earnings were above analyst expectations.

Texas Instruments Inc. (TXN) said it will cut about 4.8% of its global workforce in a cost-reduction effort as it shifts away from the mobile market.

Williams-Sonoma Inc.'s (WSM) fiscal third-quarter profit rose 13% as the houseware and furniture retailer posted same-store sales increases across its brands.

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

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