Among the companies whose shares are expected to actively trade in Thursday's session are Sirius XM Radio Inc. (SIRI), Zumiez Inc. (ZUMZ) and Seagate Technology PLC (STX).

Sirius said it added about 1.7 million net new subscribers in 2011, exceeding the company's expectations. Shares rose 3.3% to $1.89 in after-hours trading as the satellite-radio operator said it ended the year with nearly 21.9 million subscribers. The company had expected 1.6 million subscriber additions for the year.

Zumiez raised its fourth-quarter guidance as December same-store sales beat analyst expectations. Shares surged 11% to $29.16 in after-hours trading.

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Seagate lifted its revenue outlook for its fiscal second and third quarters as the impact from Thailand flooding wasn't as bad as expected and the company benefited from higher pricing. Seagate shares jumped 7.4% to $18.07 in after-hours trading.

American Greetings Corp. (AM) unveiled plans to buy back up to $75 million of its Class A shares in an apparent effort to reassure investors following the company's December stock plunge. Shares rose 3% to $12.87 after hours following the shareholder-friendly move. The stock was off 28% over the past month through Wednesday's close.

Sonic Corp.'s (SONC) fiscal first-quarter earnings fell 24% as its top line dropped again and its margin weakened, although the drive-in restaurant chain's comparable sales crept higher after an unexpected drop last quarter. Shares slipped 2.2% to $6.70 in after-hours trading.

Oclaro Inc. (OCLR) said revenues in its just-ended fiscal quarter were better than expected and predicted all but one of its product lines hindered by Thai flooding would be restarted by the end of the month. Shares in the optical components company jumped 12% to $3.30 in after-hours trade.

 
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Billionaire activist investor Carl Icahn indicated he could be willing to raise his $15-a-share bid for Commercial Metals Co. (CMC) and he encouraged shareholders to accept his unsolicited $1.73 billion tender offer for the scrap-metal processor.

Macy's Inc. (M) said its expects to post fourth-quarter charges of $25 million to $30 million for expenses related to a series of store openings and closings, part of its continuing steps to focus on locations with growth opportunities.

Mosaic Co.'s (MOS) fiscal second-quarter earnings fell 39% as the sale of an equity investment boosted year-ago results, though phosphate and potash sales increased in the latest period.

Resources Connection Inc.'s (RECN) fiscal second-quarter earnings rose 45% as the outsourcing and advisory company continued to see revenue growth and benefited from a favorable accounting adjustment.

Texas Industries Inc.'s (TXI) fiscal second-quarter loss widened as the construction-materials company's margins slumped despite recent cost-cutting efforts.

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

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