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