Packaging Corp of America said it would acquire smaller rival Boise Inc for about $1.28 billion to increase its container board capacity.
Packaging Corp's offer of $12.55 per share represents a premium of 26 percent to Boise's Friday close.
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Boise shares were trading at $12.75 in premarket trading on the New York Stock Exchange.
Including debt, the deal is valued at about $2 billion.
(Reporting by Rohit T. K. in Bangalore; Editing by Saumyadeb Chakrabarty)