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.

1st NRG Corp.
3d Oil Limited
88 Energy Limited
A-cap Resources Limited
Abilene Oil And Gas Limited
Abraxas Petroleum Corporation
Acacia Coal Limited
Adams Resources & Energy, Inc.
Adavale Resources Limited
Advantage Oil & Gas Ltd
Adx Energy Ltd
Aegean Marine Petroleum Network Inc.
Africa Oil Corp.
African Energy Resources Limited
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