| West Hasting Unit O-3-19054 | Denbury Onshore, LLC | Hastings, West | 566 | 45M | 14.1M | Jan 1993 – Jul 2026 |
| Abrams, W. H. O-3-4505 | Sue-Ann Operating, L.C. | West Columbia New | 89 | 1.63M | 134K | Jan 1993 – Jul 2026 |
| Belcher, W. T. "B" O-3-10386 | Denbury Onshore, LLC | Manvel (F.B. I, Oligocene) | 37 | 1.6M | 4.04M | Jan 1993 – Jul 2026 |
| Welch O-3-23167 | Jay Management Company, LLC | Esperson Dome (Vicksburg) | 3 | 1.08M | 459K | Feb 1997 – Jul 2026 |
| Colby, E. H. O-3-8768 | Denbury Onshore, LLC | Manvel (4970) | 4 | 913K | 1.52M | Jan 1993 – Jul 2026 |
| Turner, B. L. O-3-5623 | Denbury Onshore, LLC | Hastings, East | 28 | 899K | 944K | Jan 1993 – Jul 2026 |
| Hogg, W. C. NCT-2 O-3-4494 | Sue-Ann Operating, L.C. | West Columbia | 70 | 843K | 53.7K | Jan 1993 – Jul 2026 |
| Texasgulf, Inc. Fee Unit O-3-23450 | Texas Independent Explor Ltd. | Old Ocean North (10150) | 1 | 743K | 415K | Dec 1997 – Jul 2026 |
| H. O. F. A. O-3-10399 | Denbury Onshore, LLC | Manvel (F.B. II, Oligocene) | 18 | 707K | 1.46M | Jan 1993 – Jul 2026 |
| Halls Bayou ''A'' O-3-27355 | Kaler Energy Corp. | Rattlesnake Mound (Big Gas Sand) | 1 | 682K | 561K | Feb 2018 – Jul 2026 |
| Surface, R. O. O-3-5622 | Denbury Onshore, LLC | Hastings, East | 2 | 678K | 612K | Jan 1993 – Jul 2026 |
| HCL O-3-26729 | Denbury Onshore, LLC | Hastings, West | 3 | 675K | 0 | Apr 2014 – Jul 2026 |
| I.P. Farms O-3-23415 | Messy Oil and Gas, LLC | Danbury Dome (5655 Sand) | 4 | 664K | 2.31M | Oct 1997 – Jul 2026 |
| Baker, Carrie O-3-2793 | Cerberus Engineering, LLC | Lochridge | 5 | 648K | 1.08M | Jan 1993 – Jul 2026 |
| Old O-3-652 | Elliott Oil & Gas Operating Co. | Chocolate Bayou ( Alibel) | 2 | 617K | 750K | Jan 1993 – Jul 2026 |
| Lemmer, J. O-3-23233 | Denbury Onshore, LLC | Manvel (F.B. II, Oligocene) | 2 | 532K | 1.31M | Feb 1997 – Jun 2020 |
| Bennett Estate O-3-22845 | HG Operating LLC | Danbury Dome | 19 | 492K | 1.12M | Dec 1995 – Jul 2026 |
| Lemmer, J. L. O-3-7852 | Denbury Onshore, LLC | Manvel, E. (Oakville #3) | 3 | 437K | 301K | Jan 1993 – Jul 2026 |
| Price, J. E. O-3-17855 | STS Petroleum LLC | Rowan, N. (Frio, Upper 9600) | 1 | 433K | 297K | Jan 1993 – Jul 2026 |
| Phillips, J. G. O/A O-3-4508 | Sue-Ann Operating, L.C. | West Columbia New | 43 | 422K | 258K | Jan 1993 – Jul 2026 |
| Ramsey State Prison Farm "A" O-3-23518 | McGowan Working Partners, Inc. | Lochridge | 3 | 410K | 286K | Jul 1998 – Jul 2026 |
| Mound Co. Lse. NCT-1 O-3-9728 | Linc Gulf Coast Petroleum, Inc. | Hoskins Mound | 38 | 410K | 96.1K | Jan 1993 – Mar 2013 |
| Jamison, Thos. O-3-1129 | Orangefield East Corp | Danbury Dome | 15 | 398K | 21 | Jan 1993 – Jul 2026 |
| Force, E.J. Unit O-3-19559 | Goldking Minerals Mgmt, L.L.C. | Alvin, North (8100) | 1 | 371K | 475K | Jan 1993 – Jul 2026 |
| Wieting O-3-25393 | White Marlin Operating Co, LLC | Chocolate Bayou (Alibel Stray) | 1 | 347K | 322K | Jul 2009 – Jul 2026 |
| Wieting, A. M. O-3-679 | White Marlin Operating Co, LLC | Chocolate Bayou ( Frio Upper) | 9 | 342K | 1.84M | Jan 1993 – Jul 2026 |
| Williams, MM O-3-22523 | Goldking Minerals Mgmt, L.L.C. | Alvin, North (7900) | 2 | 334K | 378K | Sep 1994 – Jul 2026 |
| Helton O-3-22667 | Goldking Minerals Mgmt, L.L.C. | Alvin, North (7900) | 1 | 329K | 187K | Mar 1995 – Jul 2026 |
| Buller O-3-24252 | MBX Operating LLC | Algoa, West (Frio A) | 1 | 309K | 141K | Aug 2002 – Jul 2026 |
| Ramsey State Farm O-3-2799 | Cerberus Engineering, LLC | Lochridge | 8 | 300K | 30K | Jan 1993 – Jul 2026 |
| Welch Foundation O-3-23680 | Linc Gulf Coast Petroleum, Inc. | Hoskins Mound | 4 | 299K | 163K | Jun 1999 – Mar 2013 |
| McFarland, Robert et AL O-3-12539 | Texas Petroleum Investment Co. | Pledger (Frio 7040) | 4 | 264K | 384K | Jan 1993 – Jul 2026 |
| Ramsey State Prison Farm -B- O-3-2800 | McGowan Working Partners, Inc. | Lochridge | 3 | 260K | 279K | Jan 1993 – Jul 2026 |
| Belcher, W. T., "A" O-3-10259 | Denbury Onshore, LLC | Manvel (FB-III, Oligocene) | 7 | 256K | 586K | Jan 1993 – Jul 2026 |
| E. J. Force Unit O-3-23594 | Goldking Minerals Mgmt, L.L.C. | Alvin, North (8550) | 1 | 256K | 448K | Nov 1998 – Jul 2026 |
| Welch Foundation O-3-25045 | Sandpoint Texas LLC | Hoskins Mound | 19 | 256K | 100K | Jun 2006 – Jul 2026 |
| Colby, O. C. O-3-8426 | Josey Oil Company, Ltd. | Manvel (4970) | 3 | 253K | 28.7K | Jan 1993 – Jul 2026 |
| Sebesta-Cloud O-3-24319 | JH Contract Field Services | Angleton, NE. (Frio 9900) | 1 | 244K | 2.54K | Oct 2002 – Jul 2026 |
| Gibson "B" O-3-23837 | Cerberus Engineering, LLC | Lochridge | 4 | 237K | 1.09M | May 2000 – Jul 2026 |
| Belcher B60 Unit O-3-23587 | Texcal Energy (GP) LLC | Manvel (Oligocene, Frio D) | 1 | 233K | 136K | Aug 1998 – Feb 2010 |
| Houston "M" O-3-23056 | Elliott Oil & Gas Operating Co. | Chocolate Bayou, N. (Schenck) | 1 | 232K | 460K | Jun 1996 – Jul 2026 |
| Lockhart Bank Oil Unit #3 O-3-16117 | Hockley Energy, Inc. | Alvin, South (#39) | 2 | 230K | 338K | Jan 1993 – Jul 2026 |
| Locke O-3-24201 | Pine Ridge Operating, L.P. | Algoa, West (Frio A) | 1 | 226K | 229K | Mar 2002 – Jul 2026 |
| Smith, T. L. O-3-1124 | Deguello Operating LLC | Damon Mound, East (FLT BLK 1) | 20 | 218K | 76 | Jan 1993 – Jul 2026 |
| Plummer O-3-23181 | Atlas Operating LLC | Chocolate Bayou | 1 | 204K | 215K | Jan 1997 – Jul 2026 |
| IP Farms "PG" O-3-22879 | Kiawah Resources, LLC | Pegasus Gulf Coast (Alibel) | 1 | 194K | 1.03M | Aug 1995 – Jun 2015 |
| Colby, E.H. et AL O-3-18825 | Denbury Onshore, LLC | Manvel (Oligocene) | 1 | 194K | 423K | Jan 1993 – Jul 2026 |
| Miller, Wm. J., Estate O-3-5616 | Denbury Onshore, LLC | Hastings, East | 3 | 193K | 362K | Jan 1993 – Jul 2026 |
| Belcher B57 Unit O-3-23589 | Denbury Onshore, LLC | Manvel (Oligocene, Frio D) | 1 | 191K | 131K | Aug 1998 – Jul 2026 |
| Finger O-3-15173 | STS Petroleum LLC | Pleasant Bayou (Finger SD) | 1 | 191K | 179K | Jan 1993 – Jul 2026 |