Gulfport Energy Corp.
Bristow Group, Inc.
TC Pipelines LP
Gran Tierra Energy, Inc.
Imperial Oil Ltd.
Exxon Mobil Corp.
Superior Drilling Products, Inc.
GeoPark Ltd.
Sabine Royalty Trust
Chevron Corp.
Penn Virginia Corp.
SemGroup Corp.
SRC Energy, Inc.
Ecopetrol SA
MPLX LP
Targa Resources Partners LP
Antero Midstream Corp.
QEP Resources, Inc.
Hess Corp.
Talos Energy, Inc.
Southwest Gas Holdings, Inc.
WPX Energy, Inc.
Superior Energy Services, Inc.
Valero Energy Corp.
Crescent Point Energy Corp.
USA Compression Partners LP
Legacy Reserves, Inc.
PermRock Royalty Trust
Apache Corp.
North American Construction Group Ltd.
Contango Oil & Gas Co.
Exterran Corp.
Unit Corp.
BlueKnight Energy Partners LP
Hornbeck Offshore Services, Inc. (Louisiana)
Core Laboratories NV
Centennial Resource Development, Inc.
Liberty Oilfield Services, Inc.
Mitcham Industries, Inc.
McDermott International, Inc.
