Among the companies with shares expected to actively trade in Wednesday's session are Garmin Ltd. (GRMN), DreamWorks Animation SKG Inc. (DWA) and Laboratory Corp. of America Holdings (LH).

Shares of Garmin traded higher premarket after second-quarter earnings surged 70% as the personal-navigation-devices maker saw strong revenue growth and lower costs of goods sold. Results comfortably exceeded Wall Street expectations. The company also raised its full-year per-share earnings view. Shares rose 6.2% to $40.99.

DreamWorks Animation SKG's second-quarter earnings slumped 63% as the computer-animation studio struggled to match year-earlier results boosted by its popular "Kung Fu Panda 2" film. Shares fell 8.3% to $17.60 premarket.

LabCorp shares jumped 15% to $96.50 premarket on reports that the lab-testing company is the target of a private equity buyout. Mergermarket mentioned TPG Capital, Bain Capital, Blackstone Group, Kohlberg Kravis Roberts and Madison Dearborn as potential bidders. In a note to clients, Wells Fargo says the report "does not surprise us considering we have long thought that LabCorp might be a target because of its strong free cash flow generation and relatively stable business." LabCorp representatives didn't immediately respond to requests for comment.

Digital River Inc.'s (DRIV) second-quarter earnings dropped 31% after a tax benefit boosted the provider of e-commerce outsourcing's prior-year results and as revenue slipped slightly, missing the company's revenue estimates. Shares sank 19% to $14.40 premarket as the company lowered its expectations for the year, noting weaker personal-computer sales and macroeconomic uncertainty.

Silicon Image Inc.'s (SIMG) second-quarter loss narrowed as the provider of wireless and wired connectivity products' revenue grew more than it expected. Shares surged 27% to $4.98 in premarket trading as the company offered upbeat revenue guidance for the current quarter.

Genworth Financial Inc. (GNW) swung to a profit in the second quarter as results at its troubled mortgage-insurance unit improved. Shares climbed 6.8% to $5.38 in premarket trading.

Frontier Communications Corp.'s (FTR) second-quarter earnings fell 44% as the regional telecommunications company reported heavy one-time costs and fewer residential and business customers. Still, revenue and adjusted earnings beat Street expectations and the company's operating margin improved. Shares rose 5.4% to $4.13 premarket.

Career Education Corp. (CECO) swung to a second-quarter loss as goodwill and asset-impairment charges weighed on the for-profit education company's bottom-line results and as student enrollment continued to decline. The results were weaker-than-expected. Shares fell 19% to $3.80 premarket.

Shire PLC (SHPG, SHP.LN) posted a strong rise in second-quarter profit, boosted by a solid performance in its attention deficit hyperactivity disorder treatments in the U.S. and by new patient demand for its enzyme replacement therapies. The U.K. drug company says it is on track to deliver double-digit full-year earnings growth this year. Shares rose 5.9% to $91.24 premarket.

Radian Group Inc. (RDN) swung to a fiscal second-quarter loss as the mortgage insurer recorded weak revenue driven by lower net premiums earned, losses from derivatives and other financial instruments, and lower investment gains. Shares fell 8.6% to $2.56 in premarket trading.

True Religion Apparel Inc.'s (TRLG) second-quarter profit rose 3.6% as the jeans maker reported continued increases in direct consumer sales in the U.S. But revenue growth slowed from previous quarters, and the company cut its full-year outlook. Shares slipped 16% to $22.05in premarket trading.

 
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Allstate Corp. (ALL), the largest publicly traded home-and-auto insurer in the U.S., swung to a second-quarter profit as the company raised rates and natural disasters proved far less costly.

Arthur J. Gallagher & Co.'s (AJG) second-quarter earnings rose 72% as the insurance broker and consulting firm continued to report growth at its brokerage and risk-management segments.

BMC Software Inc.'s (BMC) fiscal first-quarter earnings fell 43% as higher costs, soft demand and foreign-exchange headwinds drove weaker-than-expected results.

BRE Properties Inc.'s (BRE) second-quarter earnings more than doubled as same-store revenue continued to improve.

Cabot Corp.'s (CBT) fiscal third-quarter profit rose 10% as the chemicals and specialty materials company posted stronger income from its core business, as prices increased.

CBOE Holdings Inc. (CBOE) boosted its quarterly dividend by 25% and raised its stock-buyback program by $100 million, looking to bolster shareholder value.

CBRE Group Inc.'s (CBG) second-quarter income surged 24% as its Americas region, its largest top-line contributor, posted strong revenue growth.

DDR Corp.'s (DDR) second-quarter loss widened as the real-estate investment trust reported heavy write-downs, masking revenue growth.

Edison International's (EIX) second-quarter earnings fell 46% as the utility company saw losses at its wholesale-power unit as well as a delay in a planned rate increase continue to drag down results.

Electronic Arts Inc. (EA) said it will make a key videogame free for players following struggles to gain traction with a subscription model. It reported its fiscal first-quarter earnings fell 9% as core revenue slipped.

Idenix Pharmaceuticals Inc. (IDIX) said it has commenced a public offering of $150 million of its shares.

Jones Lang LaSalle Inc.'s (JLL) second-quarter profit fell 15% as higher costs masked stronger revenue.

Kimco Realty Corp.'s (KIM) second-quarter profit jumped 79% as the real-estate investment trust reported improved revenue from rental properties and a boost from property sales.

MAP Pharmaceuticals Inc. (MAPP) intends to offer and sell an undisclosed number of shares, as it raises funds for general corporate purposes and to bring its investigational migraine drug Levadex to market.

Nabi Biopharmaceuticals (NABI) said its modified Dutch auction self-tender offer was oversubscribed as of its deadline Monday.

Oneok Inc.'s (OKE) second-quarter profit rose 18%, helped by strong results from its Oneok Partners LP (OKS) unit, which saw earnings improve 21%.

Papa John's International Inc.'s (PZZA) second-quarter earnings jumped 22% as the pizza-delivery company continued to see higher sales in North America and abroad. Results topped analyst expectations and the company again raised its full-year outlook.

Pioneer Natural Resources Co. (PXD) swung to a second-quarter loss amid $280.3 million in asset write-downs amid weaker commodities prices.

Polypore International Inc.'s (PPO) second-quarter income fell 31%, as the company saw lower sales of its lithium-battery separators and higher expenses.

QEP Resources Inc. (QEP) swung to a second-quarter loss as the exploration-and-production company saw prices for natural gas, oil and natural-gas liquids all drop substantially and weaken overall revenue.

Regency Centers Corp.'s (REG) second-quarter earnings fell 56%, though the shopping-center owner saw a key gauge of its profitability beat market estimates.

RenaissanceRe Holdings Ltd.'s (RNR) second-quarter earnings surged as the insurer saw far fewer expenses related to insured catastrophic events.

Scripps Networks Interactive Inc. (SNI) has authorized an additional $1 billion in share repurchases, as the cable-network operator looks to boost shareholder return.

Spirit Airlines Inc. (SAVE) said that shareholders tied to Oaktree Capital Management L.P. are offering to sell all their shares of the company, amounting to roughly 9.39 million.

Take-Two Interactive Software Inc. (TTWO) reported a much wider first-quarter loss on a 32% drop in revenue, as two high-profile videogame titles failed to gain traction with consumers.

Taubman Centers Inc. (TCO) plans to sell 2.5 million shares, intending to use the proceeds in part to pay down debt.

TTM Technologies Inc. (TTMI) swung to a second-quarter profit as impairment charges weighed on the printed circuit board manufacturer's year-ago results, but core earnings missed the company's expectations.

Uni-Pixel Inc. (UNXL) said the company and two of its shareholders will offer a total of 3 million shares.

WebMD Health Corp.'s (WBMD) swung to second-quarter loss as the health-information provider reported that its advertising and sponsorship revenue dropped 23%.

Write to Anna Prior at anna.prior@dowjones.com

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