Among the companies with shares expected to actively trade in Wednesday's session are Facebook Inc. (FB), Netflix Inc. (NFLX) and InvenSense Inc. (INVN).

Facebook posted a quarterly loss Tuesday as costs mounted, but the social site also issued some encouraging data on its progress in making money from mobile phone use. The company said that 14% of its advertising sales in the period came from mobile devices. Shares rose 13% after hours to $22.01.

Netflix reported an 88% decline in third-quarter net income and signaled the expense of its international expansion would weigh on profits as the year closes out. The company said it expected overseas markets to report as much as a $119 million loss in the fourth quarter, effectively wiping out the gains it will pull in from its U.S. streaming customers. Shares slumped 16% to $57.09 after hours.

InvenSense said Chairman and Chief Executive, Steven Nasiri, is stepping down from the company he founded and will be succeeded by board member Behrooz Abdi. Shares sank 18% to $10.28 after hours.

Buffalo Wild Wings Inc.'s (BWLD) third-quarter profit fell 5%, as healthy sales trends were overshadowed by stubbornly high chicken-wing prices, causing the company to lower its earnings expectations for the year. Shares slid 11% to $74 after hours.

Donaldson Co. (DCI) cut its fiscal-year guidance, citing weakened conditions in its markets as engine original-equipment manufacturers and disk drive customers have lowered their production levels. Shares were off 5.2% to $30.97 after hours.

IRobot Corp. (IRBT) reported its third-quarter profit rose 8.2% as the robot company saw revenue growth on the back of stronger home-robots sales, but shares dropped 15% to $19.33 after hours as the company warned its outlook has deteriorated.

Panera Bread Co.'s (PNRA) third-quarter earnings jumped 27% as same-store sales continued to improve for the bakery-cafe chain. Shares rose 5.6% after hours to $169.25 on the company's better-than-expected results and as Panera increased full-year guidance.

Polycom Inc. (PLCM) swung to a third-quarter loss as the video-conferencing company posted weaker revenue and was weighed down by acquisition-related and restructuring costs. Shares were up 3.7% after hours to $9.60, however, as results were better than expected.

RF Micro Devices Inc. (RFMD) swung to a second-quarter loss as the chip maker continued to battle sluggish global demand for semiconductors. But the profit and revenue results beat the company's expectations, and shares rose 11% in after-hours trading to $4.40.

STMicroelectronics N.V. (STM, STM.MI, STM.FR) swung to a third-quarter loss as the company faced continued sluggishness in the global semiconductor business, and recorded a large write-down on its wireless business. Shares were down 5.5% to $5.70 after hours.

Tempur-Pedic International Inc. (TPX) swung to a loss in the third quarter as increased competition continued to take a toll on the mattress maker, pushing sales below expectations. Shares plunged 18% to $25.99 after hours as the company also cut its outlook for the year.

The Food and Drug Administration has declined to approve United Therapeutics Corp.'s (UTHR) new drug application for an oral formulation of a drug to treat high blood pressure, the biotechnology company said. Shares tumbled 8.2% to $48.89 after hours.

XOMA Corp. (XOMA) unveiled plans to offer common stock, but didn't specify the number of shares. The drug maker plans to use proceeds for the continued development and testing of its diabetes treatments gevokizumab and XMet platform, as well as for other corporate purposes. The company had about 68.2 million shares outstanding as of Aug. 3. Shares slid 8.1% to $2.96 after hours.

Zynga Inc. (ZNGA) is cutting staff for the first time in the social game firm's brief history, by parting ways with about 5% of its workforce. Shares fell 5.5% to $5.70 after hours.

 
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Ace Ltd. (ACE) swung to a third-quarter profit as the insurer booked lower realized losses and benefited from growth in premiums written.

Aflac Inc.'s (AFL) third-quarter earnings rose 38% as the life insurer benefited from double-digit revenue growth and net investment gains.

Altera Corp.'s (ALTR) third-quarter profit fell 15% as the chip maker continued to record declining sales.

Amgen Inc.'s (AMGN) third-quarter earnings more than doubled as newer products contributed to revenue growth and the biopharmaceutical company's year-earlier results were hurt by litigation-related charges.

Boston Properties Inc.'s (BXP) third-quarter earnings slipped 18% as the office landlord's results were hurt by higher interest expense and losses on early extinguishments of debt, though rental revenue improved.

Broadcom Corp.'s (BRCM) third-quarter profit fell 19% as rising costs offset the chip maker's growing revenue.

Buckeye Technologies Inc.'s (BKI) fiscal first-quarter profit slipped 28% as revenue was hurt by a facility outage and weaker demand in some markets.

Logistics company C.H. Robinson Worldwide Inc.'s (CHRW) third-quarter earnings rose 1.7% as sales in its key trucking segment improved, as did those in its sourcing and payment services divisions.

C.R. Bard Inc.'s (BCR) third-quarter profit was roughly flat from a year earlier as sales rose less than expected at the medical-device firm.

Chicago Bridge & Iron Co.'s (CBI) third-quarter earnings rose 11% as the engineering and construction company recorded stronger results in two of its three segments, masking lower new awards.

Dow Chemical Co. (DOW) unveiled plans to cut 5% of its workforce and shut down 20 manufacturing facilities, as the chemicals giant looks to further cut costs as it faces a weak macroeconomic environment.

Gilead Sciences Inc.'s (GILD) revenue jumped 14% in the third quarter on the strength of its blockbuster HIV drug franchise, but research and development costs ate into profit, which fell 8.9% from a year earlier.

Fortune Brands Home & Security Inc.'s (FBHS) income jumped in the third quarter, as new construction spurred cabinet sales and its steady hand on profitability helped the bottom line.

Hanesbrands Inc.'s (HBI) third-quarter profit rose 21% as the apparel maker saw higher sales and some relief from elevated cotton costs.

Telecommunications company IDT Corp. (IDT) has suspended its regular quarterly dividend for the 2013 fiscal year, citing uncertainty surrounding federal tax rates, but will pay out the total planned amount for the year upfront in the form of a special dividend.

Juniper Networks Inc.'s (JNPR) third-quarter earnings dropped 80% as restructuring charges offset modest revenue growth from the network-gear maker's service business lines, though its chief executive warned of more demand challenges ahead. The company's estimate of earnings this quarter remained cautious.

Millennial Media Inc. (MM) said an offering of 10 million of its shares priced at a 0.7% discount to Tuesday's close.

Monster Beverage Corp. (MNST) defended the safety of its products, a day after the Food and Drug Administration said it is investigating reports that five people may have died after drinking the company's caffeine-packed drinks.

Nabors Industries Ltd.'s (NBR) third-quarter earnings rose 1.9% as the oil-and-gas drilling contractor reported revenue growth, led by its international business and the year-earlier period was hit by asset write-downs.

Norfolk Southern Corp.'s (NSC) third-quarter profit fell 27% as the railroad reported lower revenue from its two biggest segments.

VMware Inc.'s (VMW) third-quarter earnings slipped 12% as the software maker reported higher operating expenses and lower-than-expected bookings, though it posted double-digit revenue gains from both services and licenses.

Willis Group Holdings PLC's (WSH) third-quarter profit fell 57% on lower fees and commissions, higher costs and fewer one-time benefits.

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

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