By Nathalie Tadena 
 

Among the companies with shares expected to actively trade in Friday's session are Advanced Micro Devices Inc. (AMD), Aeterna Zentaris Inc. (AEZS, AEZ.T) and J.B. Hunt Transport Services Inc. (JBHT).

AMD sharply lowered its estimate of quarterly sales and profitability a week before its scheduled earnings report, joining a long list of peers wrestling with eroding personal-computer demand. The chipmaker blamed a challenging global economy for sales hurt by weaker-than-expected demand across all its major product lines. Shares fell 9.1% to $2.91 after hours.

Aeterna Zentaris has commenced an offering of units, consisting of shares and warrants to purchase shares. In May, the drug development company filed plans to offer up to $100 million of its shares or warrants to raise funds for general corporate purposes. It recently had a market capitalization of $58 million, according to FactSet. Shares slid 13% to $2.73 after hours.

J.B. Hunt's third-quarter earnings rose 14% as the trucking company's intermodal division posted stronger results and margins edged higher. Shares jumped 5.7% after hours to $57.90 as revenue outpaced analysts' estimates.

 
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Energy services company AGL Resources Inc. (GAS) cut its full-year earnings estimates, saying "unprecedented warm weather" in the first half of 2012 hurt results.

Bank of the Ozarks Inc.'s (OZRK) third-quarter profit rose 2% as the regional bank's interest income improved slightly and credit quality improved on a year-over-year basis.

Canadian Pacific Railway Ltd. (CP, CP.T) named Brian Grassby as its new chief financial officer, effective Nov. 1, replacing Kathryn McQuade, who plans to retire.

ExactTarget Inc. (ET) has acquired two privately held companies, Pardot LLC and iGoDigital, in separate cash-and stock deals for a combined $116.5 million as it also projected a more-upbeat view for the third quarter.

Moody's Investors Service lowered its outlook on Ferro Corp. (FOE) to negative from stable, a day after the specialty materials and chemical company lowered its full-year earnings guidance and said it is exploring strategic options for its solar pastes business.

Genesee & Wyoming Inc.'s (GWR) traffic fell 5.2% in September as the railroad operator reported a steep decline in shipments of farm and food products, as well as fewer carloads of coal and minerals. RailAmerica Inc., which Genesee & Wyoming recently acquired, said its freight carloads last month rose 2.4%.

Heartland Express Inc.'s (HTLD) third-quarter earnings fell 19% as the trucking company's revenue growth was again outpaced by higher operating costs. Results fell short of analyst expectations.

PartnerRe Ltd. (PRE) expects to record a $63 million net after-tax charge in the third quarter related to severe drought conditions in the U.S. during 2012.

Standard & Poor's Ratings Services placed Sprint Nextel Corp.'s (S) rating on review for a potential upgrade, saying the wireless-services company's rating could gain support from the higher-rated Softbank Corp. (9984.TO).

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

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