| Yorktown Energy Partners XI, L.P. | 1,265,591 | $10.8m | 10.0% |
| YORKTOWN ENERGY PARTNERS IX, L.P. | 1,248,736 | $10.7m | 29.6% |
| First Eagle Investment Management, LLC | 1,224,116 | $10.5m | 0.0% |
| Yorktown Energy Partners X, L.P. | 836,511 | $7.2m | 15.0% |
| BlackRock, Inc. | 492,327 | $4.2m | 0.0% |
| VANGUARD CAPITAL MANAGEMENT LLC | 361,310 | $3.1m | 0.0% |
| MORGAN STANLEY | 333,063 | $2.8m | 0.0% |
| Simcoe Capital LLC | 171,062 | $1.5m | 0.9% |
| GEODE CAPITAL MANAGEMENT, LLC | 164,119 | $1.4m | 0.0% |
| DISCOVERY CAPITAL MANAGEMENT, LLC / CT | 128,930 | $1.1m | 0.0% |
| AMERICAN CENTURY COMPANIES INC | 116,000 | $991,800 | 0.0% |
| RENAISSANCE TECHNOLOGIES LLC | 113,810 | $973,075 | 0.0% |
| South Dakota Investment Council | 88,318 | $755,000 | 0.0% |
| UBS Group AG | 73,416 | $627,707 | 0.0% |
| D. E. Shaw & Co., Inc. | 71,158 | $608,401 | 0.0% |
| DIMENSIONAL FUND ADVISORS LP | 67,592 | $577,942 | 0.0% |
| Samalin Investment Counsel, LLC | 62,278 | $532,478 | 0.2% |
| STATE STREET CORP | 60,270 | $515,309 | 0.0% |
| WEDGE CAPITAL MANAGEMENT L L P/NC | 59,896 | $512,111 | 0.0% |
| NORTHERN TRUST CORP | 54,142 | $462,914 | 0.0% |
| VANGUARD PORTFOLIO MANAGEMENT LLC | 41,265 | $352,816 | 0.0% |
| VANGUARD FIDUCIARY TRUST CO | 36,171 | $309,262 | 0.0% |
| Nuveen, LLC | 20,642 | $176,489 | 0.0% |
| Pingora Partners LLC | 20,172 | $172,471 | 0.1% |
| Keystone Financial Group | 14,962 | $127,927 | 0.0% |