Merrill Lynch, New York, (NYSE: MER) plans to acquire Petrie Parkman & Co., Denver and Houston, for an undisclosed amount. Petrie Parkman is an award-winning investment bank that provides M&A services, asset and private company divestitures, corporate finance, and equity research for the North American oil and gas industry. It was founded in 1989. Co-founder Tom Petrie will become a vice chairman of Merrill Lynch and member of the executive client coverage group. Petrie Parkman chief executive Tom Petrie says, "When these resources are aligned with our shared emphasis on long-term relationships, it will enable us to provide expanded, world-class services to energy companies and investors."