Alleghany buying Transatlantic – Property and casualty insurer Alleghany Corp. has agreed to buy the reinsurer Transatlantic Holdings Inc. in a cash-and-stock deal valued at about $3.4 billion.

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    NEW YORK (AP) -- Property and casualty insurer Alleghany Corp. has agreed to buy the reinsurer Transatlantic Holdings Inc. in a cash-and-stock deal valued at about $3.4 billion. The companies said …


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