Headwaters MB LLC, a Denver-based investment banking firm, has been acquired by another investment bank based in Boston. Headwaters -- based at 1225 17th St. in Denver -- and Boston-based Capstone Partners LLC announced "a strategic transaction whereby Capstone has acquired Headwaters to form Capstone Headwaters LLC." Both companies are middle-market investment banks focused on mergers and acquisitions. The combined firm will have 150 professionals across 20 offices in the United States, the United...