|
NRT
|
North European Oil Royality Trust
|
US
|
NYSE
|
|
OII
|
Oceaneering International, Inc.
|
US
|
NYSE
|
|
OIS
|
Oil States International, Inc.
|
US
|
NYSE
|
|
PBT
|
Permian Basin Royalty Trust
|
US
|
NYSE
|
|
PDS
|
Precision Drilling Corporation
|
US
|
NYSE
|
|
PTEN
|
Patterson-UTI Energy, Inc.
|
US
|
NASDAQ
|
|
RCON
|
Recon Technology, Ltd.
|
US
|
NASDAQ
|
|
RES
|
RPC, Inc.
|
US
|
NYSE
|
|
SDPI
|
Superior Drilling Products, Inc.
|
US
|
AMEX
|
|
SLB
|
Schlumberger N.V.
|
US
|
NYSE
|
|
SOI
|
Solaris Oilfield Infrastructure, Inc.
|
US
|
NYSE
|
|
TS
|
Tenaris S.A.
|
US
|
NYSE
|
|
TTI
|
Tetra Technologies, Inc.
|
US
|
NYSE
|
|
TUSK
|
Mammoth Energy Services, Inc.
|
US
|
NASDAQ
|
|
WFRD
|
Weatherford International plc
|
US
|
NASDAQ
|
|
WHD
|
Cactus, Inc.
|
US
|
NYSE
|
|
WTTR
|
Select Energy Services, Inc.
|
US
|
NYSE
|
|
XPRO
|
Expro Group Holdings N.V.
|
US
|
NYSE
|
|
ZEST
|
Ecoark Holdings, Inc.
|
US
|
NASDAQ
|
|
ALTX
|
Altex Industries Inc
|
US
|
OTC
|