Houston-based Simmons & Co. International, an independent investment bank specializing in the energy industry, was scooped up by Minneapolis-based Piper Jaffray for a cool $139 million. Piper Jaffray will pay $91 million in cash and $48 million in restricted stock for the company. The transition should be relatively seamless, said Fredrick Charlton, a managing director at Simmons & Co in Houston. One of Simmons & Co. biggest objectives was keeping its team intact, and the company was able to achieve...