SEF Energy is a private holding company with a portfolio of U.S.-based oilfield manufacturing and service assets. We’re in th ... e business of delivering returns through methodical capital allocation, asset management and leadership. Our strong financial backing, conservative investment strategies and hands-on approach provide stability and durable, long-term growth for our subsidiary companies. We are headquartered in Oklahoma City, OK and are proud to serve market-leading E&P companies in the major producing basins and unconventional shale plays across the United States. read more