Priceline.com Inc. plans to buy online travel research company Kayak for cash and stock worth $1.8 billion or $40 per share. Kayak allows users to compare hundreds of travel sites when looking for flights, hotels and rental cars. The deal is expected to expand Priceline’s travel business and build Kayak’s brand. The deal needs the approval of Kayak’s shareholders and of regulators. It is expected to close in the first quarter of next year.
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