|
AAON
|
AAON Inc
|
|
|
AHGP
|
Alliance Holdings GP LP
|
|
|
ARLP
|
Alliance Resource Partners LP
|
|
|
BKEP
|
Blueknight Energy Partners LP
|
|
|
BOKF
|
BOK Financial Corp
|
|
|
CELP
|
Cypress Energy Partners LP
|
|
|
EDUC
|
Educational Development Corp
|
|
|
HP
|
Helmerich and Payne Inc
|
|
|
MCEP
|
Mid-Con Energy Partners LP
|
|
|
MMP
|
Magellan Midstream Partners LP
|
|
|
MTRX
|
Matrix Service Co
|
|
|
NGL
|
NGL Energy Partners LP
|
|
|
OKE
|
ONEOK Inc
|
|
|
OKS
|
ONEOK Partners LP
|
|
|
REI
|
Ring Energy Inc
|
|
|
RRMS
|
Rose Rock Midstream LP
|
|
|
SEMG
|
SemGroup Corp
|
|
|
UNT
|
Unit Corp
|
|
|
WPZ
|
Williams Partners LP
|
|
