| 1 | George Kaiser Family Foundation | $298.4M | 7.9M | Hold |
| 2 | WELLINGTON MANAGEMENT GROUP LLP | $126.9M | 3.3M | Added |
| 3 | VANGUARD GROUP INC | $91.9M | 2.4M | Trimmed |
| 4 | BlackRock, Inc. | $76.5M | 2.0M | Added |
| 5 | Copeland Capital Management, LLC | $75.0M | 2.0M | Added |
| 6 | TORTOISE CAPITAL ADVISORS, L.L.C. | $44.3M | 1.2M | Trimmed |
| 7 | TimesSquare Capital Management, LLC | $36.1M | 950,222 | Added |
| 8 | Ranger Investment Management, L.P. | $34.7M | 912,300 | Added |
| 9 | KAYNE ANDERSON CAPITAL ADVISORS LP | $25.2M | 664,577 | Added |
| 10 | CUSHING ASSET MANAGEMENT, LP dba NXG INVESTMENT MANAGEMENT | $24.7M | 650,000 | Added |
| 11 | GEODE CAPITAL MANAGEMENT, LLC | $23.4M | 616,604 | Added |
| 12 | STATE STREET CORP | $21.7M | 572,420 | Added |
| 13 | DIMENSIONAL FUND ADVISORS LP | $19.5M | 514,252 | Added |
| 14 | EMERALD ADVISERS, LLC | $18.4M | 485,260 | Added |
| 15 | FMR LLC | $18.2M | 480,346 | Trimmed |
| 16 | D. E. Shaw & Co., Inc. | $14.9M | 392,792 | Added |
| 17 | Yaupon Capital Management LP | $14.8M | 390,353 | Added |
| 18 | NEUBERGER BERMAN GROUP LLC | $14.2M | 374,392 | Trimmed |
| 19 | Russell Investments Group, Ltd. | $13.0M | 343,449 | Added |
| 20 | NORTHERN TRUST CORP | $12.8M | 337,703 | Added |
| 21 | MORGAN STANLEY | $12.8M | 337,348 | Trimmed |
| 22 | MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. | $12.8M | 336,084 | Trimmed |
| 23 | EMERALD MUTUAL FUND ADVISERS TRUST | $11.4M | 299,991 | Added |
| 24 | GOLDMAN SACHS GROUP INC | $11.0M | 289,600 | Added |
| 25 | HOTCHKIS & WILEY CAPITAL MANAGEMENT LLC | $10.7M | 281,037 | Added |