| Salas Peter E +1 co-filerDirector, 10% owner, 10% owner · 1 transaction | — | 15.46Mas of Oct 2014 | — | — | — |
| Bluescape Energy Partners III GP LLC +6 co-filers10% owner · 1 transaction | — | 11.08M†as of Apr 2021 | — | — | — |
| Dolphin Offshore Partners LP +1 co-filer10% owner, Director, 10% owner · 29 transactions | — | 5.30M†as of Jan 2021 | — | 43.6K | 15.72M |
| Lawrence Bryan H.Director · 7 transactions | — | 4.68M† | — | — | — |
| Bluescape Energy Partners III GP LLC +4 co-filers10% owner · 1 transaction | — | 4.52Mas of Apr 2024 | — | — | 700.0K |
| 2624063 Alberta Ltd. +2 co-filers10% owner · 3 transactions | — | 4.46M†as of Jul 2025 | — | 42.0K | — |
| Lawrence Bryan HDirector · 60 transactions | — | 4.17M†as of May 2025 | — | — | 1.18M |
| Bird John T +8 co-filersMember of 13G Group (1) · 12 transactions | — | 3.18Mas of Mar 2006 | — | — | 734.6K |
| Balmon Investments Ltd. +1 co-filer10% owner · 15 transactions | — | 2.19Mas of Apr 2024 | — | 267.3K | — |
| Balmon Investments Ltd. +2 co-filers10% owner · 12 transactions | — | 2.12M†as of Sep 2023 | — | 158.9K | — |
| Bluescape Energy Partners III GP LLC +5 co-filers10% owner · 37 transactions | — | 2.07M | — | — | 2.45M |
| Estate of Antonie VandenBrink10% owner · 5 transactions | — | 1.97M†as of Sep 2021 | — | 138.0K | — |
| Estate of Antonie VandenBrink +1 co-filer10% owner · 10 transactions | — | 1.84Mas of Aug 2021 | — | 32.5K | — |
| Boomer Petroleum LLC +4 co-filers10% owner · 2 transactions | — | 1.77Mas of Mar 2021 | — | — | — |
| Harding NealFormer Director Resign 4/24/06 · 3 transactions | — | 722.7Kas of Jun 2006 | 80.0K | — | — |
| Riley BobbyCEO, Director · 52 transactions | — | 495.5K | 608.2K | 650 | 278.5K |
| Clendening John ADirector · 12 transactions | — | 406.5Kas of Apr 2012 | 80.0K | 75.0K | — |
| Yorktown IX Associates LLC +4 co-filers10% owner · 11 transactions | — | 390.9Kas of Apr 2024 | — | — | 283.2K |
| Yorktown Energy Partners IV LP +9 co-filers10% owner · 6 transactions | — | 390.9Kas of Oct 2021 | — | — | — |
| Yorktown IX Associates LLC +5 co-filers10% owner · 6 transactions | — | 390.9Kas of Oct 2021 | — | — | — |
| Bailey Jeffrey RCEO, Director · 3 transactions | — | 249.5Kas of Dec 2012 | 673.2K | — | 500.0K |
| Sorensen Cary VVice President · 4 transactions | — | 236.2Kas of Apr 2014 | 236.2K | 200.0K | 200.0K |
| Riley Corey NeilCIO & CCO · 37 transactions | — | 213.6K | 278.6K | — | 48.7K |
| Riley KevinPRESIDENT · 23 transactions | — | 202.7Kas of Dec 2023 | 161.1K | — | 30.5K |
| Riley Philip ACFO & EVP STRATEGY · 26 transactions | — | 201.9K | 293.0K | 2.0K | 19.2K |
| Bailey Clarke HFormer Director · 7 transactions | — | 119.8Kas of Apr 2007 | 80.0K | — | 80.0K |
| Suter John PatrickChief Operating Officer · 6 transactions | — | 102.4K | 125.5K | — | — |
| Bonney AmberChief Accounting Officer · 10 transactions | — | 75.6Kas of Jun 2024 | 99.2K | — | — |
| Gutman JeffreyCAO & EVP Commercial Risk · 6 transactions | — | 69.8K | 91.7K | — | — |
| Behrent Matthew KDirector · 40 transactions | — | 64.4Kas of Oct 2020 | — | 20.0K | — |
| Salas Carlos PDirector · 3 transactions | — | 64.0Kas of Apr 2011 | 50.0K | — | — |
| di Santo Beth ASecretary & General Counsel, Director · 5 transactions | — | 61.1K | 61.1K | — | — |
| Ruth Mark AChief Financial Officer · 1 transaction | — | 60.1Kas of Feb 2007 | 60.0K | — | — |
| Thon Richard MDirector · 21 transactions | — | 32.5Kas of Oct 2020 | — | — | — |
| Bayless Rebecca LDirector · 4 transactions | — | 31.7K | 26.3K | — | — |
| Nordberg E WayneDirector · 6 transactions | — | 31.7K | 31.7K | — | — |
| Arriaga Brent AlexanderDirector · 9 transactions | — | 23.8K | 31.7K | — | 7.9K |
| Palmer Michael HEVP CORPORATE LAND · 7 transactions | — | 23.4Kas of Feb 2023 | 8.4K | — | — |
| Rugen Michael J.CHIEF FINANCIAL OFFICER, Director · 22 transactions | — | 17.6Kas of Apr 2021 | 10.8K | — | — |
| Saadati BobbyDirector · 2 transactions | — | 9.0K | 9.0K | — | — |
| Carter Robert MPres. Tengasco Pipeline Corp. · 2 transactions | — | 7.7Kas of Jan 2007 | 6.0K | — | — |
| Brooks Hughree FennonFormer Director · 12 transactions | — | 6.9Kas of Jan 2018 | — | — | — |
| Balmon Investments Ltd. +5 co-filers10% owner · 2 transactions | — | 0as of Dec 2021 | — | — | — |