|U.S. Silica Holdings, Inc.
||U.S. Silica Holdings, Inc. produces and sells commercial silica in the U.S.
||Halliburton Company provides various products and services to the energy industry for the exploration, development, and production of oil and gas properties worldwide.
||Schlumberger Limited operates as an oilfield services company in the United States and internationally.
|Continental Resources, Inc.
||Continental Resources, Inc. is an independent crude oil and natural gas exploration and production company with operations in the North, South and East regions of the United States.
|Pioneer Natural Resources Co.
||Pioneer Natural Resources Company (Pioneer) is an independent oil and gas exploration and production company with operations in the United States and South Africa.
|EOG Resources, Inc.
||EOG Resources, Inc., explores, develops, produces and markets natural gas and crude oil primarily in producing basins in the United States, Canada, The Republic of Trinidad and Tobago, the United Kingdom, and The People's Republic of China.
|Parsley Energy, Inc., Class A
||Parsley Energy is an independent oil and natural gas company with operations in the Permian Basin that develops unconventional oil and natural gas reserves.
|Superior Energy Services, Inc.
|Anadarko Petroleum Corp.
||Anadarko Petroleum Corporation is an independent oil/gas exploration/production company, with 2.3 billion barrels of oil equivalent of proved reserves as of 12.31.09, utilizing 3 operating segments: Oil/gas exploration/production, Midstream and Marketing.
|Baker Hughes, Inc.
||Baker Hughes Incorporated is engaged in the oilfield services industry.
Total Portfolio Holdings
(as of 12/31/2016)
updated quarterly, upon availability