Among the companies with shares expected to actively trade in Thursday's session are Clearwire Corp. (CLWR), NV Energy Inc. (NVE) and Big Lots Inc. (BIG).

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 19% to $4.14 premarket.

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 premarket.

Big Lots' fiscal first-quarter earnings fell 21% as litigation charges and weaker same-store sales more than offset the closeout retailer's slightly improved sales. The company also lowered its full-year adjusted earnings estimate and provided below-consensus earnings guidance for the current quarter. Shares fell 7.5% to $35.51 premarket.

Express Inc.'s (EXPR) fiscal first-quarter earnings fell 23% as the youth-focused clothing retailer posted flat same-store sales growth and higher expenses. Still, the company raised its outlook for the year and offered a current-quarter forecast above analysts' estimates. Shares rose 9.7% to $20.60 premarket.

Hanwha SolarOne Co. (HSOL) narrowed its fiscal first-quarter loss as the Chinese solar-products maker logged strong revenue growth amid higher shipments, and also reported positive gross profit. The company also said prices improved from the fourth quarter and appear to have stabilized. American depositary shares jumped 13% to $2.14 premarket. Fellow solar stocks also rose, including Real Goods Solar Inc. (RSOL) adding 6% to $3.19.

Yingli Green Energy Holding Co. (YGE) sharply widened its fiscal first-quarter loss as the Chinese solar-products maker reported lower revenue and narrower margins, while also naming a new financial head. The company reported higher-than-expected shipment volumes during the quarter, primarily supported by the strong European and the U.S. markets and the growth of demand in new markets such as Japan. American depositary shares rose 4.9% to $3.43 premarket.

Frontline Ltd. (FRO, FRO.LN) swung to a first-quarter loss as the oil-tanker company reported a double-digit percentage fall in revenue, while offering a grim outlook on the current quarter. Shares tumbled 5.1% to $2.04 in premarket trading as revenue missed Street views.

Avago Technologies Ltd.'s (AVGO) fiscal second-quarter earnings fell 16% as the chip maker continued to be hurt by tepid demand. However, shares rose 4.6% premarket to $36.00 as results beat analysts' expectations, helped by improved resales in the industrial business.

Boardwalk Pipeline Partners L.P. (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 5.1% to $29.70 premarket.

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 4.9% to $28.20 premarket.

Boston Private Financial Holdings Inc. (BPFH) said B.P. Holdco L.P., an affiliate of its largest shareholder Carlyle Group L.P. (CG), has agreed to sell 3.9 million shares. Boston Private had 79.1 million shares outstanding as of May 3. Shares fell 3.6% to $9.85 premarket.

 
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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.

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 Anna Prior at anna.prior@dowjones.com

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