Among the companies with shares expected to actively trade in Friday's session are Priceline.com Inc. (PCLN), Monster Beverage Corp. (MNST) and Rackspace Hosting Inc. (RAX).

Priceline's second-quarter earnings increased 24% as the online-travel agent recorded stronger margins and continued international bookings growth. Shares were up 5.5% at $985 after hours as results topped the company's expectations.

Monster Beverage's second-quarter earnings fell 2.7% amid expenses related to litigation and regulatory issues regarding alleged health risks posed by energy drinks. Shares were down 4.3% at $60.75 in after-hours trading as revenue growth fell into the single digits on a percentage basis and also missed analysts' expectations.

Rackspace's second-quarter profit slid 11% as marketing, research and other costs jumped, masking a double-digit increase in the data-center provider's sales. Still, shares jumped 11% to $49 in after-hours trading, as the results exceeded Wall Street expectations.

Allscripts Healthcare Solutions Inc. (MDRX) swung to a second-quarter loss amid acquisition- and restructuring-related charges and other items as the electronic health-records company also recorded weaker revenue. Shares were down 6.4% at $15.10 in after-hours trading as adjusted earnings and revenue missed analysts' expectations.

Brooks Automation Inc.'s (BRKS) fiscal third-quarter profit plunged 81% as the technology-products company posted lower revenue and income from joint ventures. Shares were down 13% to $8.50 after hours as the company issued weaker-than-expected guidance for the current quarter.

Dendreon Corp.'s (DNDN) second-quarter loss narrowed as the pharmaceutical company cut operating expenses, though revenue continued to decline. Results were weaker than analysts had expected, and the company said that based on current enrollment trends in July and August, it doesn't expect enough of a sales increase in the second half of the year to meet its goal of increasing sales of its prostate-cancer drug Provenge year-over-year. Shares slumped 13% to $3.98 after hours.

Molycorp Inc.'s (MCP) second-quarter loss widened on higher costs and as prior-year results benefited from a higher income-tax benefit, though the rare-earth mining company's revenue jumped due to rising volume. Results for Molycorp, which manufacturers and sells rare-earth products used in high-tech gadgets, missed Wall Street expectations. Shares were down 14% to $6.41 after hours.

Chinese money manager Noah Holdings Ltd. (NOAH) lifted its full-year earnings outlook, saying business has grown faster than expected. Noah's American depositary shares jumped 15% to $15 in after-hours trading.

Tableau Software (DATA) swung to a second-quarter loss as the data-analysis software maker posted higher costs that masked a double-digit revenue gain. Still, shares of the company were up 13% to $69 after hours as the results beat analysts' expectations.

Ubiquiti Networks Inc.'s (UBNT) fiscal fourth-quarter profit rose 1.3% as the company said it was gaining traction in the discount networking market. Shares surged 25% to $26.50 after-hours Thursday as results easily surpassed the company's own estimates and it offered a rosy view of the fiscal first quarter.

Universal Display Corp.'s (OLED) shares jumped in after-hours trading Thursday, after the light and electronics flat-panel display developer reported a 40% jump in second-quarter profit, topping Wall Street expectations. Sales growth was also impressive, led by strong demand for materials. Shares climbed 21% to $35.60 after hours.

The U.S. Food and Drug Administration doesn't believe it can approve Wright Medical Group Inc.'s (WMGI) bioengineered bone graft for foot and ankle fusion surgery, noting problems with the clinical study, the company said. Shares fell 11% to $24.10 in after-hours trading.

 
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Assured Guaranty Ltd.'s (AGO) second-quarter earnings fell 42% as the bond insurer reported a lower fair-value gain and a decrease in net earned premiums.

CareFusion Corp.'s (CFN) fiscal fourth-quarter earnings increased 14% as the medical-equipment company's margins improved and overhead expenses decreased, though medial-systems sales weakened.

DeVry Inc. (DV) swung to a fiscal fourth-quarter loss as the for-profit education company again posted weaker enrollment, along with higher restructuring expenses and write-downs.

Dish Network Corp. (DISH) called on Congress to update local TV carriage rules, saying outdated retransmission rules have resulted in a historic number of blackouts.

Gap Inc. (GPS) projected fiscal second-quarter earnings ahead of Wall Street's estimates, while also reporting same-store sales for July that were slightly weaker-than-expected.

Gleacher & Co.'s (GLCH) second-quarter loss widened as the boutique firm incurred a restructuring charge related to its exits from its investment-banking and fixed-income businesses.

Great Plains Energy Inc.'s (GXP) second-quarter profit rose 9.5% as the utility was buoyed by a positive effect from rates that masked a slight decline in revenue.

J.C. Penney Co. (JCP) Chairman Thomas Engibous affirmed his support for Chief Executive Myron Ullman, saying Mr. Ullman has led "significant actions to correct the errors of previous management" since he retook the helm of the struggling department-store retailer four months ago.

Lions Gate Entertainment Corp. (LGF) swung to a fiscal first-quarter profit as fans continued to watch the last of the "Twilight" series and other Lions Gate movies and TV shows from the comfort of their sofas.

Expenses tied to Noodles & Co.'s (NDLS) initial public offering weighed on the fast-casual dining chain's second-quarter profit, though the company's first results since debuting on the market exceeded Wall Street's expectations.

Activist investor Carl Icahn has bought more shares of speech-recognition technology maker Nuance Communications Inc. (NUAN), lifting his stake to 16%.

Nvidia Corp.'s (NVDA) fiscal second-quarter profit fell 19% as the chip maker's revenue fell.

Onyx Pharmaceuticals Inc.'s (ONXX) second-quarter loss narrowed as the cancer-drug maker's sales more than doubled from a year ago, helping results modestly exceed Wall Street expectations.

Stifel Financial Corp.'s (SF) second-quarter earnings rose 13% as the regional broker posted stronger revenue, led by strong growth in its investment-banking business.

Drug developer Synergy Pharmaceuticals Inc. (SGYP) plans to spin off the part of its business working on a shingles treatment as a separate publicly traded company.

Write to Nathalie Tadena at nathalie.tadena@wsj.com

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