Among the companies whose shares are expected to actively trade in Friday's session are Starbucks Corp. (SBUX), Riverbed Technology Inc. (RVBD) and Juniper Networks Inc. (JNPR).

Starbucks's fiscal first-quarter earnings rose 10% to a record high on solid comparable sales gains in its Americas stronghold, as well as robust growth in its smaller Asian operations and the burgeoning consumer products segment. Shares in the coffee giant were down 2.1% at $47.31 after hours as the company's guidance boost was more conservative than expected.

Riverbed's fourth-quarter earnings rose 60% as revenue jumped across each of its regions, though margins slipped. Shares declined 14% to $25.80 in recent after-hours trading.

Juniper Networks Inc.'s (JNPR) fourth-quarter profit fell 49% as the network-gear maker's router sales continued to weaken. Shares dropped 8.1% to $20.56 in recent after hours trading as the company forecast a grim first-quarter adjusted profit that missed analysts' expectations.

Chubb Corp.'s (CB) fourth-quarter earnings fell 27% on higher losses and loss expenses, as the property-and-casualty insurer's core profit also dropped despite more written premium growth. Separately Thursday, Chubb said its board authorized a new share buyback program of up to $1.2 billion in shares. Shares were down 1.9% to $69 after hours.

DeVry Inc. (DV) fiscal second-quarter earnings plunged 90% on a write-down at its health-care college and another revenue decline. Shares in the for-profit educator were down 8.7% at $36.25 after hours as earnings and revenue both fell more than expected.

Robert Half International Inc.'s (RHI) fourth-quarter profit rose 72% as the company said it saw strong demand for staffing in the technology and accounting sectors. Shares fell 3.9% to $28.60 after hours.

Freescale Semiconductor Holdings I Ltd.'s (FSL) fourth-quarter loss narrowed sharply even as its top line shrank on weaker sales. Core earnings, meanwhile, notched a slightly weaker-than-expected improvement driven by stronger margins. Shares were down 4.4% at $15 after hours.

KLA-Tencor Corp.'s (KLAC) fiscal second-quarter earnings fell 40% amid lower-than-expected revenue and weaker margins. Shares gained 3.8% to $20.55 after hours.

Seagate Technology PLC (STX) added $1 billion to its stock buyback plan and raised its quarterly dividend by 39%, joining a long list of companies putting their cash holdings to work and returning value to shareholders. Shares were up 3.8% to $20.55 in recent after-hours trading.

Amgen Inc.'s (AMGN) fourth-quarter earnings fell 8.6% on tax impacts and charges as the biopharmaceutical company reported stronger revenue and margins. The company gave full-year guidance mostly in line with expectations. The shares were up 1% at $68.75 in recent after-hours trading.

J.B. Hunt Transport Services Inc.'s (JBHT) fourth-quarter earnings rose 25% as the trucking company again reported revenue gains across its segments, led by its intermodal unit. Shares were off 1.3% at $48.64 after hours.

Cepheid (CPHD) swung to a fourth-quarter loss as a one-time patent-expiration charge masked a higher core profit lifted by rising clinical sales. Shares in the maker of biological testing systems jumped 21% to $41.50 after hours Thursday on stronger-than-expected results and upbeat guidance.

Informatica Corp.'s (INFA) fourth-quarter earnings rose 22% on higher sales, but the company predicted full-year profit below expectations because of an expected loss of a tax benefit. Shares fell 6.7% to $40.83 after hours.

Emulex Corp. (ELX) swung to a fiscal second-quarter profit following a year-earlier write-down, while sales of its data-storage products surged. Shares rose 5.9% to $9.82 after hours as the company also predicted an optimistic adjusted third-quarter profit.

Delek US Holdings Inc. (DK) predicted it would report a loss in the fourth quarter because of high oil costs and a decline in asphalt prices. Shares in the oil refiner and retailer were down 6% at $12 after hours.

 
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Cliffs Natural Resources Inc. (CLF) predicted 2011 per-ton revenue in its biggest segment would be at the low end of its target range, with volumes and average revenue coming in below or at the low ends of outlooks in other segments as well.

Eastman Chemical Co.'s (EMN) fourth-quarter earnings soared as the company reported broad revenue growth, led by its performance chemicals and intermediates segment, and as charges weighed on year-ago results.

Micron Technology Inc. (MU) said President and Chief Operating Officer D. Mark Durcan will be retiring at the end of August and Mark W. Adams, vice president of worldwide sales, will succeed him.

Hancock Holding Co.'s (HBHC) fourth-quarter earnings rose 11%, and the regional lender's core earnings jumped on takeover-boosted interest income.

Leap Wireless International Inc. (LEAP) said its Chief Financial Officer Walter Z. Berger will leave the company for another job in the technology sector shortly after the company reports its full-year results.

Motorola Mobility Holdings Inc. (MMI) swung to the red in the fourth quarter as costs tied to its pending acquisition by Google Inc. (GOOG) offset higher revenue from handsets.

Nstar's (NST) fourth-quarter profit rose 16% as the higher retransmission revenue offset the effect of lower gas sales.

Republic Airways Holdings Inc. (RJET) on Thursday named David Siegel as chief executive, president and interim chief operating officer of its Frontier Airlines unit as it prepares to dispose of the loss-making Frontier business.

Ryland Group Inc. (RYL) swung to a modest profit in the fourth quarter--its second quarter in the black in recent years--as an increase in closings and average prices boosted revenue.

ScanSource Inc.'s (SCSC) fiscal second-quarter earnings slipped 1.2% as expenses increased and as proceeds from a legal settlement boosted year-ago results.

Timken Co.'s (TKR) fourth-quarter profit rose a stronger-than-expected 21% as the parts maker's industrial supply business reported stronger sales.

Werner Enterprises Inc.'s (WERN) fourth-quarter earnings rose 22% as the trucking company said it saw stronger freight demand from a year earlier.

-Edited by Maya Pope-Chappell and Ian Thomson; write to maya.pope-chappell@dowjones.com and ian.thomson@dowjones.com