Among the companies whose shares are expected to actively trade in Wednesday's session are Apple Inc. (AAPL), Yahoo Inc. (YHOO) and CA Inc. (CA).

Apple's fiscal first-quarter earnings more than doubled, as both profit and revenue hit record highs, led by strong sales of the iPhone and iPad. Shares jumped 7.3% at $451.18 in recent after-hours trading as the results blew past analyst expectations.

Yahoo's fourth-quarter earnings fell 5.3% on a bigger tax provision, while the Internet company's operating income improved thanks to lower operating and revenue costs despite weaker revenue. Shares rose 0.9% to $15.55 in recent after-hours trading.

CA's fiscal third-quarter earnings rose 32% as the business-software maker saw revenue growth in each of its three segments. Shares surged 15% to $26.25 in after-hours trading as the company also unveiled a capital allocation program that targets the return of up to $2.5 billion to shareholders through fiscal year 2014.

Advanced Micro Devices Inc. (AMD) swung to a fourth-quarter loss as write-downs tied to the chip maker's investment in its spun-off foundry business offset stronger personal-computer processor sales. Shares slipped 2.9% to $6.34 after hours as AMD's soft revenue overshadowed its stronger-than-expected core earnings. The stock had fallen 15% over the past year through Tuesday's close.

Norfolk Southern Corp.'s (NSC) fourth-quarter earnings rose 19% as the railroad company recorded revenue growth across its segments, with particular strength in its coal business. However, shares declined 2.6% to $73.50 in recent after-hours trading as revenue missed analyst expectations.

Kinder Morgan Energy Partners LP (KMP) said it plans to spend roughly $140 million to further expand coal export operations along the Gulf Coast and reached a long-term throughput agreement with Arch Coal Inc. (ACI). Kinder Morgan Energy said the companies are in final discussions to include port space for coal shipments at Kinder's facilities on the East Coast. Shares declined fractionally to $88.47 after hours.

Fusion-io Inc.'s (FIO) fiscal second-quarter earnings loss narrowed as the data-efficiency specialist more than doubled its top line, but its costs took up a bigger proportion of the revenue than in the year prior. Share were down 13% at $26.27 after hours.

Tempur-Pedic International Inc.'s (TPX) fourth-quarter earnings rose 22% as the mattress company reported stronger sales of mattresses and pillows. Shares rose 4.7% to $65.20 in recent after-hours trading as the company projected 2012 results that exceeded expectations.

Mercury Computer Systems Inc. (MRCY) reported its fiscal second-quarter earnings rose 75% as sales to defense customers increased. However, shares dropped 10% to $13.45 after-hours as the company lowered its full-year earnings forecast.

Radian Group Inc. (RDN) said it entered a three-pronged transaction with units of fellow insurer Assured Guaranty Ltd. (AGO) that it said would significantly increase its capital position and preserve liquidity. Shares in mortgage insurer Radian were up 6.1% at $3.13 in after-hours trading. Assured shares were down 4 cents at $15.52.

Williams Partners LP (WPZ) unveiled plans Tuesday to offer 6.5 million common units as the company looks to raise money to fund capital expenditures and for other general partnership purposes. Units slipped 3.4% to $62.65 after hours.

 
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Altera Corp. (ALTR) fourth-quarter earnings fell 37% on weak sales, as the semiconductor maker reported sequential revenue drops in all its markets.

Buckeye Technologies Inc. (BKI) swung to a fiscal second-quarter loss on a significant write-down, but adjusted earnings rose as the fiber maker improved margin and specialty-fiber sales. The company also increased its quarterly dividend by a penny to 7 cents a share.

Ethan Allen Interiors Inc.'s (ETH) fiscal second-quarter profit slumped 45% after a tax benefit in the year-earlier period, but the home-furnishings company's adjusted earnings rose on higher sales and margin.

Everest Re Group Ltd. (RE) said it expects to incur net catastrophe losses of about $245 million, after reinstatement premiums and taxes, for the fourth quarter as losses from the flooding in Thailand topped prior estimates.

A federal appeals court upheld a ruling against General Electric Co.'s (GE) financing arm that charged the conglomerate with understating some of its taxable income.

Martin Marietta Materials Inc. (MLM) unveiled the names of five candidates it plans to push for election onto Vulcan Materials Co.'s (VMC) board, prompting the takeover target to again rebuke its hostile suitor.

Stryker Corp.'s (SYK) fourth-quarter earnings rose 36% as the medical-device maker reported revenue growth despite a soft market for orthopedic joint replacements.

Total System Services Inc.'s (TSS) fourth-quarter profit rose 27% as the payment-services provider's top line grew in every major region.

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

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