| RIVERSTONE HOLDINGS LLC | 55,266,669 | $771,522,699 | 39.32% |
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| PICKERING ENERGY PARTNERS LP | 114,300 | $1,595,628 | 20.02% |
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| Post Oak Energy Holdings, LLC | 4,900,841 | $68,415,740 | 17.24% |
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| Palo Duro Investment Partners, LP | 3,962,428 | $55,315,495 | 15.23% |
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| Webs Creek Capital Management LP | 2,260,000 | $31,549,600 | 14.06% |
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| Sagefield Capital LP | 3,364,761 | $46,972,064 | 6.61% |
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| Aventail Capital Group, LP | 6,085,973 | $84,960,183 | 5.91% |
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| Covalent Partners LLC | 100,000 | $1,396,000 | 4.47% |
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| Ranger Investment Management | 3,733,246 | $52,116,114 | 3.46% |
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| Monashee Investment Management LLC | 501,100 | $6,995,356 | 2.92% |
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| Yaupon Capital Management LP | 2,038,856 | $28,462,430 | 2.64% |
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| Merewether Investment Management, LP | 2,599,478 | $36,288,713 | 2.20% |
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| Tributary Capital Management, LLC | 1,546,782 | $21,593,077 | 2.04% |
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| MOODY ALDRICH PARTNERS LLC | 678,511 | $9,472,014 | 1.80% |
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| First Dallas Securities Inc. | 532,923 | $7,440 | 1.70% |
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| Leeward Investments, LLC - MA | 2,187,485 | $30,537,291 | 1.56% |
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| River Road Asset Management, LLC | 7,647,410 | $106,757,844 | 1.52% |
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| Ghisallo Capital Management LLC | 1,000,000 | $13,960,000 | 1.43% |
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| Mesirow Institutional Investment Management, Inc. | 993,523 | $13,869,581 | 1.41% |
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| Woodline Partners LP | 8,570,557 | $119,644,976 | 1.40% |
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