Among the companies with shares expected to actively trade in Friday's session are Zipcar Inc. (ZIP), LinkedIn Corp. (LNKD) and OpenTable Inc. (OPEN).

Zipcar's second-quarter loss narrowed as the car-sharing operator reported higher sales, though the company conceded it is facing some challenges as new-member gains were under expectations and growth in the U.K. was tempered due to a weak local economy. Shares slipped 16% to $8.88 after hours and hit the lowest level since the company went public in April 2011, as Zipcar trimmed its revenue outlook for the year and said it brought in fewer new members than anticipated.

LinkedIn's second-quarter income fell 38% as higher expenses masked better-than-expected revenue growth. However, shares rose 7.3% after hours to $100.35 after the company again raised its revenue estimates for the year.

OpenTable's second-quarter earnings fell 9% as the restaurant reservations manager spent more on sales and marketing amid a relaunch of its toptable site in the U.K. Shares climbed 14% to $39 after hours as adjusted earnings topped the OpenTable's expectations and as the company raised its full-year guidance

Blue Nile Inc.'s (NILE) second-quarter earnings fell 44% as higher input costs pressured the online jeweler's margins and overhead expenses rose, though results topped the company's expectations. Shares surged 22% to $29 after hours as the company also offered an upbeat review view for the current quarter.

Women's clothing retailer Body Central Corp.'s (BODY) second-quarter earnings slumped 35%, as same-store sales and margins slid lower. Shares were knocked down 17% after hours to $7.94, as the company again lowered its full-year guidance.

ComScore Inc.'s (SCOR) second-quarter loss narrowed, but the market-research firm's revenue grew less than expected due to weakness in its TV copy testing business and foreign currency headwinds. Shares slumped 11% to $13.74 after hours, as revenue missed comScore's own expectations and as the company lowered its full-year guidance.

EOG Resources Inc.'s (EOG) second-quarter income rose 34% as the natural-gas-and-oil producer posted sharply higher oil output-benefit results, though prices for oil, natural gas and natural-gas liquids all fell. Shares rose 3% to $99 after hours as results beat expectations.

Exide Technologies (XIDE) posted a fiscal first-quarter loss that widened on a substantial valuation-allowance charge and lighter revenue. Shares sank 17% after hours to $2.40 after hours as Wall Street expected a quarterly profit and higher revenue.

Glu Mobile Inc.'s (GLUU) second-quarter loss widened as operating expenses rose, but the game maker projected third-quarter results below analyst expectations. Shares were off 6.9% to $4.34 after hours

MasTec Inc.'s (MTZ) second-quarter profit fell 32% compared with a prior-year quarter that included a one-time gain, even as revenue climbed. The results beat the company's expectations, and the company raised its full-year outlook. Shares jumped 9.5% to $17.50 after hours.

MercadoLibre Inc.'s (MELI) second-quarter profit jumped 71% as the online marketplace reported an increase in users and items sold. The results beat Street expectations, and shares climbed 13% to $75.49 after hours.

Molycorp Inc. (MCP) swung to a steep second-quarter loss as the rare-earth mining company's expenses soared, masking a small increase in sales as volume jumped higher though average selling prices declined. Shares slid 10% to $14.40 in after-hours trading as Molycorp reported a surprise adjusted loss.

Southwestern Energy Co. (SWN) swung to a second-quarter loss as impairment charges resulting from lower natural gas prices weighed on the energy producer's bottom-line results, and revenue fell more than analysts expected. Shares were off 4.2% to $30.79 after hours.

TheStreet Inc. (TST) said it will suspend its third-quarter dividend as the online financial-news company looks to cut costs and also reported its second-quarter loss widened slightly as revenue fell. Shares sank 11% to $1.33 after hours.

   Watchlist: 

Activision Blizzard Inc. (ATVI) said its net income fell nearly 45% in the second quarter, but the videogame maker increased its full-year outlook based on strong expected sales of its coming titles for the holiday-shopping season.

Profit at American International Group Inc. rose 27% to $2.3 billion in the second quarter, driven by improved results at the insurance operations the company has touted as essential to its post-bailout future.

American Water Works Co.'s (AWK) second-quarter income rose a better-than-expected 32% as the utility company saw higher water use boost revenue, helping the company significantly raise its margins.

CBS Corp.'s (CBS, CBSA) second-quarter earnings rose 8.1% as the media company recorded stronger results from its cable-networks business and margins improved, though overall revenue fell more than analysts expected.

Consolidated Edison Inc.'s (ED) second-quarter profit rose 27% as expenses from purchased power, fuel and gas decreased, masking a decline in revenue.

Dresser-Rand Group Inc.'s (DRC) second-quarter profit more than tripled as the equipment maker reported growing revenue from aftermarket services, and fewer charges.

Fluor Corp.'s (FLR) second-quarter earnings fell 2.6% as increased costs outpaced better-than-expected revenue, which was aided by strong growth in its industrial-and-infrastructure business.

Home Properties Inc.'s (HME) second-quarter earnings rose 68% as the apartment real-estate investment trust's revenue was lifted by higher average rents and occupancy rates.

Kraft Foods Inc. (KFT) is headed for splitsville a bit sooner than expected, with attention quickly shifting from its final quarterly earnings report as a whole company to the food giant's prospects as two stand-alone companies. Kraft reported a 5.4% increase in second-quarter earnings, with margins improving from tight cost controls and Europe sales proving resilient despite a darkening macroeconomic picture. But net sales posted a surprise drop.

Liberty Global Inc. (LBTYA, LBTYB) swung to a second-quarter profit as the broadband and cable operator recorded a hefty gain from the sale of its stake in an Australian pay television company.

MarkWest Energy Partners L.P.'s (MWE) second-quarter profit more than doubled as the natural-gas processor posted a surge in gains from derivatives, masking a decline in other revenue.

Mohawk Industries Inc. (MHK) second-quarter earnings rose 20% as the carpeting and flooring company benefited from factors including improved margins, higher prices and lower interest costs. However, negative currency impacts weighed on revenue.

PerkinElmer Inc.'s (PKI) second-quarter earnings rose 13% as the company reported double-digit revenue growth at its health business and stronger margins.

Pitney Bowes Inc.'s (PBI) second-quarter profit edged down 1.3% as the mail and document services company continued to see lower revenue in both of its major business segments. It lowered its full-year outlook, citing uncertainty in Europe.

Public Storage's (PSA) second-quarter profit was roughly flat from a year ago as rental revenue improved, offset by currency exchange impacts.

Sprint Nextel Corp. (S) said it received a subpoena from the U.S. Securities and Exchange Commission in connection with its probe over the wireless carrier's state and local tax collection.

Sunoco Inc. (SUN) swung to a second-quarter profit amid inventory-related gains and as the company also reported profit growth at its pipelines and retailing businesses and its refining segment returned to the black.

Thor Industries Inc. (THO) reported preliminary fourth-quarter revenue that beat analyst expectations and said it achieved record annual and fourth-quarter sales.

Vantiv Inc. (VNTV) priced its shareholders' offering of 12.2 million shares at a discount of 0.4% to the payment processor's Thursday closing price.

-Write to Nathalie Tadena at nathalie.tadena@dowjones.com

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