Energy companies

ANDV - Andeavor

ANR - Alpha Natural Resources, Inc.

APA - Apache Corporation

APC - Anadarko Petroleum Corporation

APU - AmeriGas Partners, L.P.

BHI - Baker Hughes Incorporated

BJS - BJ Services Company

CHK - Chesapeake Energy Corporation

CNX - CONSOL Energy Inc

COG - Cabot Oil & Gas Corporation

COP - ConocoPhillips

CPN - Calpine Corporation

CVX - Chevron Corporation

CXO - Concho Resources Inc.

D - Dominion Energy, Inc.

DNR - Denbury Resources Inc.

DO - Diamond Offshore Drilling, Inc.

DTE - DTE Energy Company

DUK - Duke Energy Corporation

DVN - Devon Energy Corporation

DYN - Dynegy Inc.

EOG - EOG Resources, Inc.

EP - El Paso Corporation

EQT - EQT Corporation

ESV - Ensco Rowan plc

ETR - Entergy Corporation

FSLR - First Solar, Inc.

FTI - FMC Technologies, Inc.

HAL - Halliburton Company

HES - Hess Corporation

HP - Helmerich & Payne, Inc.

KMI - Kinder Morgan, Inc.

L - Loews Corporation

MPC - Marathon Petroleum Corporation

MRO - Marathon Oil Corporation

MUR - Murphy Oil Corporation

NBL - Noble Energy, Inc.

NBR - Nabors Industries Ltd.

NE - Noble Corporation

NFX - Newfield Exploration Company

NOV - National Oilwell Varco, Inc.

NRG - NRG Energy, Inc.

OKE - ONEOK, Inc.

OXY - Occidental Petroleum Corporation

PEG - Public Service Enterprise Group Incorporated

PSX - Phillips 66

PWR - Quanta Services, Inc.

PXD - Pioneer Natural Resources Company

RDC - Rowan Companies plc

RIG - Transocean Ltd.

ROP - Roper Technologies, Inc.

RRC - Range Resources Corporation

SCG - SCANA Corporation

SE - Spectra Energy Corp

SII - Smith International, Inc.

SLB - Schlumberger Limited

STR - Questar Corporation

SUN - Sunoco Inc

SWN - Southwestern Energy Company

VLO - Valero Energy Corporation

WFT - Weatherford International public limited company

WMB - The Williams Companies, Inc.

WPX - WPX Energy, Inc.

XEC - Cimarex Energy Co.

XOM - Exxon Mobil Corporation

XTO - XTO Energy Inc