Houston’s HCC Insurance Holdings said Pioneer General Insurance Co. will merge into American Contractors Indemnity Co., both of which are wholly owned subsidiaries of HCC.

Shareholders of Willis Group Holdings Ltd., a global insurance broker, approved changing the place of incorporation of the parent company of the Willis Group from Bermuda to Ireland at a special meeting.

Willis Group Holdings Ltd., the global insurance broker, plans to change its incorporation from Bermuda to Ireland, a move it says will benefit it economically and competitively.