Among the companies with shares expected to actively trade in Thursday's session are Clearwire Corp. (CLWR), NV Energy Inc. (NVE) and Avago Technologies Ltd. (AVGO).

Dish Network Corp. (DISH) has increased its bid for mobile-broadband operator Clearwire, topping the offer Sprint Nextel Corp. (S) raised last week. Late Wednesday, Dish offered to acquire Clearwire for $4.40 a share in cash, a 29% premium over Sprint's offer of $3.40 a share. Clearwire shares jumped 22% to $4.23 after hours.

Berkshire Hathaway Inc.'s (BRKA, BRKB) power-and-gas company plans to buy Nevada utility NV Energy for about $5.6 billion in cash, a sign that Warren Buffett's corporate empire is betting on the recovery of a state hard-hit by the recent recession. MidAmerican Energy Holdings Co. has agreed to acquire NV Energy for $23.75 a share, a premium of about 23% to the Nevada utility's Wednesday closing price. NV Energy shares climbed to $23.73 after hours.

Avago's fiscal second-quarter earnings fell 16% as the chip maker continued to be hurt by tepid demand. However, shares rose 4.2% after hours to $35.87 as results beat analysts' expectations, helped by improved resales in the industrial business.

Boardwalk Pipeline Partners LP (BWP) said it plans to offer 11 million common units representing limited partner interests. It had 207.7 million common units outstanding as of April 29. Units were off 4.3% to $29.94 after hours.

Vanguard Natural Resources LLC (VNR) has commenced an offering of seven million units representing limited liability company interests. The oil-and-gas exploration company had 68.4 million units outstanding as of April 30. Units slipped 3.7% to $28.53 after hours.

 
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AFC Enterprises Inc.'s (AFCE) fiscal first-quarter earnings jumped 16% as the restaurant operator's same-store sales continued to strengthen.

Moody's Investors Service downgraded aluminum giant Alcoa Inc. (AA) into junk territory, saying weakness in its industry will continue to challenge the company's ability to trim its debt levels.

Boston Private Financial Holdings Inc. (BPFH) said B.P. Holdco L.P., an affiliate of its largest shareholder Carlyle Group LP (CG), has agreed to sell 3.9 million shares. Boston Private had 79.1 million shares outstanding as of May 3.

Fitch Ratings upgraded Calpine Corp. (CPN) by a notch, saying the wholesale power company's cleaner fuel profile and its geographic diversity help its position in the sector.

Edwards Lifesciences Corp. (EW) said a U.S. Food and Drug Administration inspection has identified a series of problems at the medical-device maker's Utah facility.

U.S. regulators have approved two new GlaxoSmithKline PLC (GSK, GSK.LN) treatments for an aggressive form of skin cancer.

O'Reilly Automotive Inc.'s (ORLY) board has authorized an extra $500 million in share buybacks.

PMC-Sierra Inc. (PMCS) has agreed to buy Integrated Device Technology Inc.'s (IDTI) enterprise flash controller business for $100 million, a move the chip maker said accelerates its entrance in the rapidly growing enterprise solid-state drive market.

Priceline.com Inc. (PCLN) plans to offer up to $1 billion of debt and said its board also has approved the repurchase of up to an additional $1 billion of stock, to return value to shareholders.

Royal Caribbean Cruises Ltd. (RCL) estimated the financial impact of fire on its Grandeur of the Seas vessel, saying that net of insurance it will hurt results by 10 cents a share.

Tilly's Inc.'s (TLYS) first-quarter earnings fell 61% as higher costs and expenses offset stronger sales at the West Coast-inspired clothing retailer, which also was hurt by larger income-tax expenses. The company also said Chief Financial Officer Bill Langsdorf intends to retire later this year.

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

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