| Yorktown Energy Partners XI, L.P. | 1,252,527 | $14,717 |
| Yorktown Energy Partners IX, L.P. | 1,235,359 | $14,515 |
| Yorktown Energy Partners X, L.P. | 827,876 | $9,728 |
| First Eagle Investment Management, LLC | 467,126 | $5,489 |
| VANGUARD GROUP INC | 363,516 | $4,271 |
| MORGAN STANLEY | 199,083 | $2,339 |
| Simcoe Capital LLC | 160,995 | $1,892 |
| RENAISSANCE TECHNOLOGIES LLC | 157,643 | $1,852 |
| GEODE CAPITAL MANAGEMENT, LLC | 157,471 | $1,851 |
| AMERICAN CENTURY COMPANIES INC | 146,421 | $1,720 |
| DISCOVERY CAPITAL MANAGEMENT, LLC / CT | 125,612 | $1,476 |
| CITADEL ADVISORS LLC | 108,055 | $1,270 |
| BlackRock, Inc. | 97,755 | $1,149 |
| JANE STREET GROUP, LLC | 94,288 | $1,108 |
| South Dakota Investment Council | 86,696 | $1 |
| WEDGE CAPITAL MANAGEMENT L L P/NC | 76,203 | $895 |
| D. E. Shaw & Co., Inc. | 71,022 | $835 |
| UBS Group AG | 67,891 | $798 |
| DIMENSIONAL FUND ADVISORS LP | 61,406 | $722 |
| Samalin Investment Counsel, LLC | 54,236 | $637 |
| GOLDMAN SACHS GROUP INC | 32,154 | $378 |
| MARSHALL WACE, LLP | 31,932 | $375 |
| STATE STREET CORP | 30,637 | $360 |
| OMERS ADMINISTRATION Corp | 29,637 | $348 |
| Byrne Asset Management LLC | 27,100 | $318 |
| J. Derek Lewis & Associates Inc. | 23,287 | $274 |
| MILLENNIUM MANAGEMENT LLC | 20,608 | $242 |
| Quantinno Capital Management LP | 18,799 | $221 |
| FRANKLIN RESOURCES INC | 17,724 | $208 |
| NORTHERN TRUST CORP | 16,175 | $190 |
| COMERICA BANK | 15,696 | $184 |
| Pingora Partners LLC | 15,191 | $178 |
| Keystone Financial Group | 14,585 | $171 |
| Point72 Asset Management, L.P. | 13,224 | $155 |
| Lunt Capital Management, Inc. | 12,580 | $148 |
| Global Trust Asset Management, LLC | 12,108 | $142 |
| XTX Topco Ltd | 11,021 | $129 |
| Qube Research & Technologies Ltd | 1,517 | $18 |
| Tower Research Capital LLC (TRC) | 1,263 | $15 |
| OSAIC HOLDINGS, INC. | 774 | $9 |
| FMR LLC | 657 | $8 |
| Bogart Wealth, LLC | 629 | $7 |
| AlphaQuest LLC | 547 | $6 |
| GAMMA Investing LLC | 520 | $6 |
| WELLS FARGO & COMPANY/MN | 461 | $5 |
| BANK OF AMERICA CORP /DE/ | 424 | $5 |
| Avalon Trust Co | 368 | $4 |
| RHUMBLINE ADVISERS | 319 | $4 |
| Farther Finance Advisors, LLC | 287 | $3 |
| HUNTINGTON NATIONAL BANK | 247 | $3 |
| GROUP ONE TRADING, L.P. | 200 | $2 |
| UBS ASSET MANAGEMENT AMERICAS INC | 187 | $2 |
| FIFTH THIRD BANCORP | 138 | $2 |
| CITIGROUP INC | 138 | $2 |
| Sunbelt Securities, Inc. | 121 | $1 |
| Quarry LP | 97 | $1 |
| PNC Financial Services Group, Inc. | 83 | $1 |
| ROYAL BANK OF CANADA | 82 | $1 |
| Costello Asset Management, INC | 80 | $1 |
| JPMORGAN CHASE & CO | 68 | $1 |
| NISA INVESTMENT ADVISORS, LLC | 68 | $1 |
| BNP PARIBAS ARBITRAGE, SA | 60 | $1 |
| JONES FINANCIAL COMPANIES LLLP | 47 | $1 |
| KERR FINANCIAL PLANNING Corp | 37 | $0 |
| EverSource Wealth Advisors, LLC | 25 | $0 |
| Federation des caisses Desjardins du Quebec | 19 | $0 |
| Center for Financial Planning, Inc. | 17 | $0 |
| BARCLAYS PLC | 17 | $0 |
| CWM, LLC | 12 | $0 |
| SIGNATUREFD, LLC | 10 | $0 |
| Parallel Advisors, LLC | 9 | $0 |
| Optiver Holding B.V. | 8 | $0 |
| Covestor Ltd | 8 | $0 |
| LOS ANGELES CAPITAL MANAGEMENT LLC | 6 | $0 |
| Rockefeller Capital Management L.P. | 5 | $0 |
| OPTIMA CAPITAL LLC | 4 | $0 |
| FNY Investment Advisers, LLC | 3 | $0 |
| Russell Investments Group, Ltd. | 2 | $0 |
| NVWM, LLC | 2 | $0 |
| DANSKE BANK A/S | 2 | $0 |
| Larson Financial Group LLC | 1 | $0 |
| SBI Securities Co., Ltd. | 1 | $0 |