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.

Akita Drilling Ltd.
Algae.tec Limited
Alice Queen Limited
Allegiance Coal Limited
Alliance Holdings GP, L.P.
Alliance Resource Partners, L.P.
Alligator Energy Limited
Alon USA Energy, Inc.
Alon USA Partners, LP
AltaGas Ltd.
Alto Metals Limited
American Electric Technologies, Inc.
American Patriot Oil & Gas Limited
Anadarko Petroleum
Anadarko Petroleum Corporation
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