Among the companies with shares expected to actively trade in Friday's session are Facebook Inc. (FB), Starbucks Corp. (SBUX) and AuthenTec Inc. (AUTH).

Facebook Inc. (FB) posted a second-quarter loss--due largely to heavy employee-compensation costs and other rising expenses--and offered little insight into its progress in making money through mobile devices. Shares slumped 13% to $23.41 in premarket trading.

Starbucks Corp.'s (SBUX) fiscal third-quarter earnings rose 19%, but the coffee giant said it saw slowing same-store sales growth in June and lowered its earnings guidance going forward. Earnings missed the company's own and analysts' estimates, marking the first time since the quarter ended December 2008 that Starbucks has fallen short of analysts' expectations. Shares fell 10% to $47.10 premarket. Shares of competitor Caribou Coffee Co. Inc. (CBOU) also fell 6.4% to $11.20.

IT-security firm AuthenTec Inc. (AUTH) shares surged premarket on news that Apple Inc. (AAPL) has agreed to buy the fingerprint authentication sensor maker for about $350 million. AuthenTec holders will receive $8 a share in cash, a 58% premium over Thursday's close. Shares are up 61% to $8.15.

Expedia Inc.'s (EXPE) robust hotel revenue growth offset pressure from continued heavy technology spending, keeping the second quarter's profit decline unexpectedly shallow. Since online travel agencies have posted mixed results, the better-than-expected results from Expedia were welcome news for investors uncertain about how the industry is faring. Shares jumped 16% to $53.00 in premarket trading, with shares of competitor Priceline.com Inc. (PCLN) also up 2.2% to $642.32.

Better-than-feared second-quarter results at Arch Coal Inc. (ACI) gave the coal company a boost premarket, with shares up 12% to $5.90. Despite logging $624 million of write-downs and cutting its 2012 sales forecast, Arch Coal anticipates second-half volumes to be "slightly higher" overall. Also, CFO John Drexler notes the company now has no debt maturing for four years, giving the company financial flexibility to deal with a prolonged and sustained downturn.

Although Coinstar Inc.'s (CSTR) second-quarter earnings jumped 38% as the company again saw growth in its Redbox DVD-rental business results, shares fell 14% to $50.95 premarket as revenue grew less than analysts expected.

Deckers Outdoor Corp.'s (DECK) second-quarter loss widened as the footwear maker's expenses continued to offset sales gains. But the company's earnings and revenue, helped by an acquisition, beat Wall Street estimates, and shares jumped 14% to $47.87 in premarket trading.

Shares of OCZ Technology Group Inc. (OCZ) surged 19% to $6.50 Friday amid media reports that Seagate Technology Inc. (STX) is weighing an acquisition of the data-storage company. Representatives for both companies were not immediately available for comment.

Green Dot Corp.'s (GDOT) second-quarter earnings slipped 1.5% as the provider of prepaid financial services' margins weakened. Shares dropped 46% to $12.71 premarket as results missed analyst expectations and as the company also lowered its full-year outlook, citing a greater level of uncertainty in the prepaid market.

Netgear Inc.'s (NTGR) second-quarter earnings rose 4.5% as the networking company's revenue improved, though adjusted profits missed analyst expectations. Shares declined 17% to $29.00 in premarket trading as the company also offered a downbeat outlook for the current quarter.

Amgen Inc.'s (AMGN) second-quarter earnings rose 8.2% as weaker sales of the biopharmaceutical company's anemia drugs were offset by growth of other treatments. Shares rose 3.4% to $82.00 premarket.

Acme Packet Inc. (APKT) swung to a slight loss in its second-quarter as the data-delivery company's revenue and margins weakened. Shares slid 16% to $13.53 premarket as the company sharply lowered its full-year guidance.

 
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Amarin Corp. PLC (AMRN) said the U.S. Food and Drug Administration has approved its Vascepa fish-oil heart pill for patients with high triglycerides, but it is still awaiting a decision on whether the capsules will be granted new chemical entity status that would give the drug a five-year period of exclusivity.

AptarGroup Inc.'s (ATR) second-quarter earnings fell 19% as the dispenser maker was hurt by a recent acquisition and saw sales slide in its beauty-and-home business, its biggest segment. It predicted third-quarter earnings below analyst expectations.

Blucora Inc. (BCOR) swung to a second-quarter profit--and forecast strong growth in the current quarter--as the company's web search business saw substantial improvement and its year-ago period was weighed down by the sale of an underperforming business.

CA Inc.'s (CA) fiscal first-quarter earnings edged down 0.4% after the business-computing company sold less new software than expected, prompting CA to scale back revenue goals for the rest of its fiscal year.

Cerner Corp.'s (CERN) second-quarter earnings rose a better-than-expected 36% as the hospital-information technology vendor saw revenue jump in both its main segments, led by system sales. However, the company predicted mostly downbeat third-quarter results.

Clearwire Corp.'s (CLWR) second-quarter loss narrowed as the wireless-data company continues its talks for a network partnership or possible asset sales.

Chubb Corp.'s (CB) second-quarter profit fell 3.6% as the property-and-casualty insurer reported heavy catastrophe losses from U.S. storms and lower investment income.

Fortune Brands Home & Security Inc.'s (FBHS) second-quarter profit climbed 9.4% as the company saw revenue growth, particularly in its plumbing and accessories segment.

Gilead Sciences Inc.'s (GILD) second-quarter earnings slid 4.6% as the biopharmaceutical company reported a double-digit rise in costs that offset strong revenue growth.

Global Payments Inc.'s (GPN) fiscal fourth-quarter earnings sank 91% as the payment-processing company booked an $84.4 million charge related to a security breach, though it reported better-than-expected adjusted earnings and revenue.

Hancock Holding Co.'s (HBHC) second-quarter earnings soared as the regional lender's net interest income increased.

HealthSouth Corp.'s (HLS) second-quarter earnings more than doubled amid improved revenue and year-earlier charges related to debt extinguishment. It raised its full-year earnings view.

Ingram Micro Inc.'s (IM) second-quarter earnings improved a better-than-expected 2.6% as the computer-equipment distributor and supply-chain-logistics company saw the strong sales growth in Latin America and the Asia-Pacific region outpace the continued weakness in Europe.

KLA-Tencor Corp.'s (KLAC) fiscal fourth-quarter earnings edged up 1.2% as the company saw a lower provision for income taxes that offset higher costs and flat revenue.

Leggett & Platt Inc.'s (LEG) second-quarter earnings rose a better-than-expected 19% after the diversified manufacturer saw expenses shrink as the company appeared to benefit from restructuring efforts, though revenue edged down.

McKesson Corp.'s (MCK) fiscal first-quarter earnings rose 33% on improved sales and a boost from a $51 million aftertax gain related to the drug wholesaler's acquisition of the remaining 50% ownership interest in its headquarters building.

Montpelier Re Holdings Ltd.'s (MRH) second-quarter profit surged as the reinsurer reported growth in premiums and fewer underwriting expenses.

Newmont Mining Corp.'s (NEM) second-quarter earnings fell 28% as the gold mining company reported lower gold and copper output, and lowered its full-year production view.

Principal Financial Group Inc.'s (PFG) second-quarter profit fell 20% as the asset manager and insurer recorded capital losses on mortgages and mortgage-backed securities.

Power-One Inc.'s (PWER) second-quarter earnings rose a better-than-expected 47% as the renewable energy products company's revenue growth easily surpassed its own estimates. The company also offered upbeat guidance for the current quarter.

Reinsurance Group of America Inc.'s (RGA) second-quarter profit rose 14% as the life reinsurer continued to see rising revenue from premiums, though claims costs also increased.

Republic Services Inc.'s (RSG) second-quarter profit more than tripled as the trash hauler recorded a lower provision for income taxes and also smaller debt-related losses from a year ago.

Taubman Centers Inc.'s (TCO) second-quarter earnings jumped 55% as the luxury-mall owner continued to see rents and occupancy strengthen. The company again raised its full-year guidance.

Universal Health Services Inc.'s (UHS) second-quarter earnings rose 3.8% as the company continued to benefit from its behavioral-health hospitals' contributions, though it saw weakness in its acute-care facilities. The company lowered its adjusted earnings guidance for the year, citing the sluggish recovery.

VCA Antech Inc.'s (WOOF) second-quarter earnings fell 13% as the animal hospital operator booked higher expenses in its core business, pressuring its profit margins. The company expects full-year results to be closer to the bottom end of its issued guidance.

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

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