Among the companies with shares expected to actively trade in Friday's session are LinkedIn Corp. (LNKD), American International Group Inc. (AIG) and Weight Watchers International Inc. (WTW).

LinkedIn's second-quarter earnings increased 33% as the professional social network continued to record increased membership rolls and revenue growth across its businesses. Shares rose 9.9% to $234.02 premarket as results were better than expected and the company again raised its full-year revenue targets.

AIG will resume paying a common-stock dividend for the first time since the depths of the financial crisis, a clear sign of the giant insurer's turnaround. Shares were up 4.8% to $49.35 premarket.

Weight Watchers' second-quarter earnings fell 16% on a $20 million debt-refinancing related charge, while its weight-loss meetings business continued to be hurt by weak revenue. The company said Chief Executive David Kirchhoff resigned. Shares tumbled 14% to $40.26 in premarket trading as Weight Watchers cut its 2013 per-share earnings guidance.

Alpha Natural Resources Inc.'s (ANR) second-quarter loss narrowed following large write-downs and restructuring charges a year earlier, though coal revenue dropped amid continued weak demand for the fuel. Shares fell 4.6% to $5.19 premarket after the company lowered the high end of its coal shipment guidance for the year.

Audience Inc.'s (ADNC) second-quarter earnings fell 38% as the audio-processing firm recorded weaker margins and increased tax expense. Shares, which had been halted ahead of the release, plummeted 21% to $10 premarket as the company said it expects an adjusted loss for the third quarter, when analysts were expecting a profit. Audience also forecast third-quarter revenue below Wall Street estimates.

Brinker International Inc.'s (EAT) fiscal fourth-quarter earnings fell 1.4% as the operator of the Chili's Grill & Bar and Maggiano's Little Italy chains posted flat systemwide same-restaurant sales and a slight increase in costs. Shares rose 3.2% to $42.25 premarket after the company reported adjusted earnings ahead of expectations.

Boyd Gaming Corp. (BYD) said its offering of 16.5 million shares priced at a 6.3% discount to Thursday's closing price. The casino operator, which has about 87 million shares outstanding, said the offering priced at $12. Shares were off 6.3% to $12 premarket.

MercadoLibre Inc.'s (MELI) second-quarter profit rose 18% as the online marketplace posted growth in the number of users and items sold. Shares jumped 12% premarket to $136.02.

ValueClick Inc.'s (VCLK) second-quarter profit fell 42% as an impairment charge weighed on the Internet advertising company's results. Shares slid 17% to $20.85 premarket as results fell short of ValueClick's expectations and the company provided weak current-quarter guidance.

Westport Innovations Inc.'s (WPRT) second-quarter loss widened from a year earlier as revenue fell and costs increased. Shares of Westport, which makes natural gas engines and vehicles, were down 9% to $29 in premarket trading as results fell short of analyst expectations and the company lowered its full-year revenue outlook.

Alaska Communications Systems Group Inc. (ALSK) shares jumped 51% to $3.86 premarket as the integrated telecommunications provider recorded second-quarter results that beat Wall Street estimates.

Gas pipeline owner Williams Partners L.P. (WPZ) and 3D human-issue developer Organovo Holdings Inc. (ONVO) on Thursday disclosed plans to sell units and shares, respectively, of their companies. Units of Williams Partners fell 5% to $49.50 in premarket trading, while Organovo fell 7.7% to $4.94.

 
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Activision Blizzard Inc. (ATVI) raised its financial outlook for the year, following second-quarter results that fulfilled a pre-announcement last week as the videogame maker prepares for the holiday shopping season.

AVG Technologies NV's (AVG) second-quarter earnings surged as the Internet and mobile security provider posted double-digit revenue growth and stronger operating margins.

CC Media Holdings Inc. (CCMO) swung to a second-quarter profit as it recorded a gain related to the sale of an investment in Sirius XM Radio Inc., while sister company Clear Channel Outdoor Holdings Inc. (CCO) also posted a profit as interest expense fell.

Consolidated Edison Inc.'s (ED) second-quarter earnings slid 20% as the utility company reported weaker revenue from its electric business and higher operating expenses.

Edison International's (EIX) swung to a loss in its second quarter as the company booked an impairment charge related to the early retirement of the San Onofre nuclear plant in California.

Ellie Mae Inc.'s (ELLI) second-quarter earnings fell 26% as the maker of mortgage-origination software logged higher expenses, masking revenue growth.

Home Properties Inc.'s (HME) second-quarter profit soared 97% as the apartment real-estate investment trust reported higher rental rates and slightly lower expenses, while a key profitability metric rose from a year ago.

Intuit Inc. (INTU) lowered its current-quarter and full-year outlook as the financial software provider said it has completed the divestiture of its financial services business.

Kraft Foods Group Inc.'s (KRFT) second-quarter profit climbed 37% as the foods company recorded a $604 million gain related to pensions, masking falling revenue as demand slid for dressings and Jell-O.

Leap Wireless International Inc.'s (LEAP) second-quarter loss sharply widened as the pay-as-you-go wireless provider recorded a steep loss tied to a debt payment and lower revenue due to fewer subscribers.

Liberty Global PLC (LBTYA, LBTYB) swung to a second-quarter loss on higher costs and fewer gains, though its revenue jumped due to its Virgin Media acquisition.

Mohawk Industries Inc.'s (MHK) second-quarter earnings rose 16% as the carpet and flooring supplier posted stronger ceramic, laminate and wood sales following several acquisitions, though margins slipped. The company beat estimates for the quarter and forecast stronger-than-expected third-quarter earnings.

ON Semiconductor Corp.'s (ONNN) second-quarter profit soared from the prior-year period on smaller impairments and lower costs. The chipmaker's third-quarter guidance came in lower than analysts' expectations.

OpenTable Inc.'s (OPEN) second-quarter profit jumped 45% as the online restaurant reservation provider reported balanced growth in North America and markets abroad, though shares fell on the company's muted outlook commentary. The company gave a third-quarter profit outlook that missed Wall Street's expectations and a more muted view for full-year profitability.

Pacira Pharmaceuticals Inc.'s (PCRX) Exparel drug didn't meet it primary goals as an intercostal nerve block for a certain type of surgery when compared with a placebo in a second Phase 3 clinical trial.

PerkinElmer Inc.'s (PKI) second-quarter profit fell 17% as the manufacturer of health-testing equipment reported higher restructuring and contract termination costs.

Public Storage's (PSA) second-quarter profit rose 31% as the real-estate investment trust benefited from higher rents and occupancy.

Standard & Poor's Ratings Services downgraded RadioShack Corp.'s (RSH) junk-rated debt another notch, adding pressure on the struggling electronics retailer to shore up its finances.

Skullcandy Inc. (SKUL) swung to a second-quarter loss as the maker of headphones continued to report steep sales declines. Revenue fell short of analyst expectations.

Southwestern Energy Co. (SWN) swung to a second-quarter profit as the oil and gas company increased production and got help from higher natural gas prices.

Tenaris SA's (TS, TEN.MI) second-quarter earnings fell 5.6% as the producer of steel casings and pipes for the energy industry reported weaker tube sales in North America and Europe.

Tesoro Corp.'s (TSO) second-quarter earnings were down 41% as an increase in operating expenses and lower oil prices masked the independent refiner's increase in revenue and production.

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

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