Among the companies with shares expected to actively trade in Monday's session are Power-One Inc. (PWER), Met-Pro Corp. (MPR) and Halliburton Co. (HAL).

Swiss power and automation technology company ABB Ltd. (ABB, ABBN.VX) Monday said it and Power-One, a maker of power-supply products, have agreed to a transaction in which ABB will acquire Power-One for $6.35 per share in cash, or $1.03 billion equity value. ABB will pay roughly $6.35 a share for Power-One. Power-One shares rose 56% to $6.30 premarket.

Pollution-control company Met-Pro agreed to be acquired by peer CECO Environmental Corp. (CECE) in a $210 million cash-and-stock deal. The deal works out to about $13.75 a share for Met-Pro, $7.25 a share in cash and $6.50 a share in stock. Met-Pro shares rose 48% to $14.16 premarket.

Halliburton swung to a first-quarter loss on a $637 million increase in reserves to litigation involving the Deepwater Horizon disaster, while elsewhere growth in the oilfield-services company's international activity again helped offset weakness in North America. Shares rose 4.1% to $38.74 premarket as adjusted earnings and revenue topped expectations and the company predicted margins would strengthen as the year progresses.

 
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B/E Aerospace Inc.'s (BEAV) first-quarter earnings rose 31% and topped consensus estimates as the aircraft-products maker continued to benefit from the delivery of new aircraft.

Caterpillar Inc.'s (CAT) first-quarter earnings fell 45% amid a broad-based revenue decline as the heavy-equipment maker was hurt by falling demand for its mining equipment. Results missed expectations.

Check Point Software Technologies Ltd.'s (CHKP) first-quarter earnings rose 3% as increased software-update revenue continued to help offset the Internet-security company's weaker product-and-licenses revenue.

A large shareholder of Donegal Group Inc. (DGICB, DGICA) has amended the terms of a recent tender offer for some of the company's Class B shares after receiving a weak response from shareholders.

Hasbro Inc.'s (HAS) first-quarter loss widened, partly due to more restructuring charges, while the toy maker posted improved revenue from three of its four product categories.

Office Depot Inc.'s (ODP) largest shareholder, Starboard Value LP, is planning to take its bid to seat its own candidates on the office-products retailer's board to shareholders through a consent solicitation, continuing a months-long fight at the company.

Sprint Nextel Corp. (S) confirmed its board has formed a special committee to evaluate a $25.5 billion acquisition offer from DISH Network Corp. (DISH).

Stillwater Mining Co. (SWC) said it disagrees with two proxy firms' backing of dissident shareholder Clinton Group Inc.'s board slate and again urged shareholders to support its director nominees.

Write to Anna Prior at anna.prior@dowjones.com

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