Houston American Energy Corporation
Houston American Energy Corp (NYSE MKT: HUSA) is an oil and gas exploration and production company focused on properties in the U.S. onshore Gulf Coast Region.

Ring Energy, Inc.
Ring Energy, Inc. (NYSE MKT: REI) is a Texas-based oil and gas exploration, development and production company with current operations in Texas and Kansas.

Diversified Resources Inc.
Gama Alta Energy LLC
Mewbourne Oil Company
Texas American Resources