Comerica Stock Soars. Fifth Third to Buy Peer for $10.9 Billion as Bank Mergers Heat Up.

1. Fifth Third will buy Comerica for $10.9 billion, forming the 9th largest U.S. bank. 2. Comerica shareholders get a 17% premium in the all-stock deal. 3. Mergers and acquisitions at a four-year high; 118 deals totaling $23.3 billion announced. 4. Easing regulations under current administration enhance M&A prospects. 5. Anticipated lower interest rates may further catalyze acquisition activity.