Paul Davis

A rush of bank M&A is welcome news to activist investors, who typically make money when banks make improvements and sell to bigger institutions. Here is a look at six firms that have stood out in recent years for pressuring management teams and boards to enhance value for shareholders.

Pinnacle Financial Partners in Nashville, Tenn., has agreed to buy Avenue Financial Holdings in Nashville.

C.K. Hong used his resignation letter to issue a scathing rebuke of the Los Angeles company's $1 billion acquisition, while claiming that he had been on a "dysfunctional board … characterized by factionalism and a lack of transparency." BBCN strongly disagreed, claiming that Hong was upset that plans were already in place to remove him from the board.

Centrue Financial in Ottawa, Ill., has agreed to sell three branches in Illinois.

ServisFirst Bancshares in Birmingham, Ala., has entered the Florida’s Tampa Bay area after hiring the former chief executive of Bay Cities Bank.

CVB Financial in Ontario, Calif., has agreed to sell a branch Sierra Bancorp in Porterville, Calif.

Chemical Financial in Midland, Mich., has agreed to buy Talmer Bancorp in Troy, Mich.

Huntington Bancshares in Columbus, Ohio, has agreed to buy FirstMerit in Akron, Ohio.

United Community Financial in Youngstown, Ohio, has agreed to buy James & Sons Insurance.

Opus Bank in Irvine, Calif., has agreed to buy Pensco Trust Co. in San Francisco from Pensco Services.