Among the companies whose shares are expected to actively trade in Wednesday's session are Avago Technologies Ltd. (AVGO), Dycom Industries Inc. (DY) and La-Z-Boy Inc. (LZB).

Avago Technologies' fiscal third-quarter profit rose 17% as stronger wired-infrastructure sales and wider margins boosted the semiconductor designer's bottom line. Shares gained 8.2% to $31.65 after-hours on the better-than-expected results.

Dycom Industries' fiscal fourth-quarter earnings more than doubled as the telecommunications contractor's sales acceleration continued and it improved margin. Shares were up 9.9% at $15.20 after hours, as the results beat expectations.

La-Z-Boy swung to a fiscal first-quarter profit on higher revenue and a tax benefit, as the furniture maker reported stronger same-store sales and margin. For the quarter La-Z-Boy posted a profit of $45.5 million, or 85 cents a share. Shares fell 10% to $6.86 in after-hours trading as profit excluding a favorable tax-asset valuation change was short of estimates.

Pacific Sunwear of California Inc.'s (PSUN) fiscal second-quarter loss narrowed as the company saw same-store sales growth for the second straight quarter. But the company forecast a steeper-than-expected loss per share for the current quarter. Shares slipped 17% to $1.80 after hours.

Shanda Games Ltd.'s (GAME) second-quarter earnings inched up 0.3% as the Chinese online-game developer's higher operating costs and tax expenses nearly overwhelmed a top-line increase. Shanda Games's American Depositary shares were up 6.2% at $5.18 after hours.

Semiconductor company Inphi Corp. (IPHI) reduced its guidance for the current quarter and predicted little sales improvement in the following one because of new-product shipment delays and skittish customers holding off on bookings. Shares in the company, which went public in November, fell 25% to $7.90 in after-hours trading.

 
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Calpine Corp. (CPN) authorized a new share-buyback plan of up to $300 million and said Tuesday it secured a $373 million credit facility to upgrade a natural-gas plant in California.

Standard & Poor's Ratings Services on Tuesday slashed Horizon Lines Inc.'s (HRZ) junk-level credit status, saying the shipping company's debt-restructuring plan as written constitutes a selective default.

Roadrunner Transportation Systems Inc. (RRTS) agreed to buy a privately held logistics and freight-consolidation company in a cash-and-stock deal it valued at $97.5 million.

SurModics Inc. (SRDX) said it will layoff about 9% of its workforce, including its chief financial officer, as part of a broad restructuring plan.

-Edited by Caitlin Nish and Corrie Driebusch; write to caitlin.nish@dowjones.com and corrie.driebusch@dowjones.com

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