| Webster Field Unit O-3-10496 | P.o.&g. Operating, LLC | Webster | 385 | 26.4M | 262M | by Jan 1993 – Aug 2026 |
| Beaumont Petroleum Co. - State O-3-1771 | Gaither Petroleum Corporation | Goose Creek | 22 | 1.47M | 59.1K | by Jan 1993 – Aug 2026 |
| Simms-Sweet O-3-1800 | Trek Resources, Inc. | Goose Creek | 28 | 1.25M | 279 | by Jan 1993 – Aug 2026 |
| State of Texas Deep Unit O-3-24007 | Etoco, L.P. | Sralla Road (Yegua) | 1 | 1.22M | 3.02M | Apr 2001 – Aug 2026 |
| Stateland Oil Company O-3-1777 | Gaither Petroleum Corporation | Goose Creek | 11 | 944K | 35.4K | by Jan 1993 – Aug 2026 |
| Gaillard Peninsula O-3-1794 | Trek Resources, Inc. | Goose Creek | 9 | 918K | 53 | by Jan 1993 – Aug 2026 |
| Taylor Heirs O-3-24948 | Morgan Enterprises, Inc. | Pierce Junction | 15 | 887K | 268K | Oct 2006 – Aug 2026 |
| Brewer Unit No. 1V O-3-21273 | CH4 Energy II, LLC | Sralla Road (Vicksburg) | 1 | 870K | 644K | by Jan 1993 – Jun 2009 |
| Stone O-3-1301 | Americo Energy Resources, LLC | Durkee (Fairbanks Sand) | 6 | 831K | 1.58M | by Jan 1993 – Aug 2026 |
| Simms-Schilling O-3-1799 | Trek Resources, Inc. | Goose Creek | 18 | 796K | 196 | by Jan 1993 – Aug 2026 |
| Stevenson Fee O-3-2400 | Chevron U. S. A. Inc. | Humble | 95 | 739K | 191K | by Jan 1993 – Jun 2018 |
| Gaillard, J. 25-Acre O-3-1792 | Trek Resources, Inc. | Goose Creek | 14 | 695K | 164 | by Jan 1993 – Aug 2026 |
| Milo, E. F. O-3-8383 | Tandem Energy Corporation | Tomball (Schultz SE.) | 7 | 505K | 970K | by Jan 1993 – Aug 2026 |
| Davis "B" Unit O-3-21196 | Columbus Energy Corp. | Sralla Road (Vicksburg) | 2 | 497K | 220K | by Jan 1993 – Mar 2003 |
| Holmes-Elliott Unit O-3-21333 | U. D. Man, Inc. | Sralla Road (Vicksburg) | 2 | 436K | 247K | by Jan 1993 – Aug 2020 |
| Smith, Ashbel #2 O-3-1809 | Trek Resources, Inc. | Goose Creek | 23 | 385K | 59.6K | by Jan 1993 – Aug 2026 |
| Theis, Fritz, a/C #1 O-3-8389 | Tandem Energy Corporation | Tomball (Schultz SE.) | 4 | 378K | 756K | by Jan 1993 – Aug 2026 |
| Koehler, F. E. Fee NCT-1 O-3-2398 | Chevron U. S. A. Inc. | Humble | 56 | 370K | 158K | by Jan 1993 – Jun 2018 |
| Laird, O. L. O-3-8380 | Tandem Energy Corporation | Tomball (Schultz SE.) | 2 | 352K | 529K | by Jan 1993 – Aug 2026 |
| Jones, L. Unit O-3-24050 | Etoco, L.P. | Sralla Road (Yegua) | 1 | 332K | 1.03M | Aug 2001 – Oct 2008 |
| Wheeler & Pickens Fee O-3-2401 | Chevron U. S. A. Inc. | Humble | 16 | 302K | 111K | by Jan 1993 – Jun 2018 |
| Rucker-Schilling O-3-1758 | Trek Resources, Inc. | Goose Creek | 7 | 298K | 27 | by Jan 1993 – Aug 2026 |
| Jones Unit O-3-23577 | Etoco, L.P. | Sralla Road (Jackson, W.) | 2 | 291K | 1.98M | Jun 1998 – May 2013 |
| Michel, A. H. O-3-8381 | Tandem Energy Corporation | Tomball (Schultz SE.) | 2 | 284K | 473K | by Jan 1993 – Aug 2026 |
| Smith-Mopac Unit O-3-22130 | Morgan Enterprises, Inc. | Pierce Junction | 2 | 275K | 38.4K | Aug 1993 – Sep 2015 |
| Jesse Bishop Unit O-3-23966 | Etoco, L.P. | Sralla Road (Jackson, SW) | 1 | 261K | 423K | Mar 2001 – Aug 2026 |
| Tomball Outlot Oil Unit O-3-23095 | Americo Energy Resources, LLC | Tomball (Schultz Lo. N.E.) | 1 | 254K | 91.8K | Oct 1996 – Aug 2026 |
| Josey, L. O-3-12020 | Hamman Oil & Refining Company | Josey Ranch (6450) | 4 | 251K | 524K | by Jan 1993 – Nov 2016 |
| Tabb "B" O-3-20069 | Gaither Petroleum Corporation | Goose Creek | 4 | 241K | 21 | by Jan 1993 – Mar 2021 |
| Liddell, F. Est. O-3-7916 | DCM Resources, LLC | Taylor Lake (7950) | 3 | 231K | 82K | by Jan 1993 – Jul 2002 |
| Schultz, E. -A- O-3-9415 | Tandem Energy Corporation | Tomball (Schultz Central) | 1 | 228K | 340K | by Jan 1993 – Aug 2026 |
| Longenbaugh, A. G. O-3-12320 | Hamman Oil & Refining Company | Cypress (Y-9) | 3 | 227K | 173K | by Jan 1993 – Jul 2014 |
| C. O. & G. Co. Fee O-3-2395 | Chevron U. S. A. Inc. | Humble | 31 | 223K | 147K | by Jan 1993 – Jun 2018 |
| Kendall O-3-1296 | Americo Energy Resources, LLC | Durkee (Fairbanks Sand) | 2 | 219K | 214K | by Jan 1993 – Aug 2026 |
| Josey, L.M. "A" O-3-19090 | Josey Oil Company, Ltd. | Joyce Richardson | 3 | 208K | 103K | by Jan 1993 – Aug 2026 |
| Lewis, Sam O-3-8397 | Tortuga Operating Company | Tomball (Schultz SE.) | 6 | 206K | 68.7K | by Jan 1993 – Aug 2026 |
| Taylor, E. R., Etal O-3-3363 | Chevron U. S. A. Inc. | Pierce Junction | 13 | 204K | 90.6K | by Jan 1993 – May 2003 |
| Josey, Mari O-3-25129 | Josey Oil Company, Ltd. | Josey Ranch (Yegua 7200) | 2 | 200K | 117K | Sep 2007 – Apr 2018 |
| Tomball Gas Unit #18 O-3-23647 | Galloway Lone Star, L.L.C. | Tomball (Kobs) | 1 | 192K | 627K | Mar 1999 – Aug 2026 |
| Gaillard Fee, Tr. 1 O-3-5569 | Gaither Petroleum Corporation | Goose Creek | 11 | 189K | 8.92K | by Jan 1993 – Aug 2026 |
| Wright, A. -E- O-3-1766 | Trek Resources, Inc. | Goose Creek | 14 | 185K | 27 | by Jan 1993 – Aug 2026 |
| Holderrieth, C. B. O-3-8371 | Tandem Energy Corporation | Tomball (Schultz SE.) | 1 | 183K | 299K | by Jan 1993 – Aug 2026 |
| Reid, John D. O-3-8388 | Tandem Energy Corporation | Tomball (Schultz SE.) | 5 | 181K | 275K | by Jan 1993 – Aug 2026 |
| Theis, Fritz, a/C #1 O-3-6895 | Tandem Energy Corporation | Tomball (Lewis 5930) | 4 | 180K | 266K | by Jan 1993 – Aug 2026 |
| Rorick, David, Jr. "A" O-3-15440 | Mse Operating Corp. | Delhi, North | 1 | 177K | 9.96K | by Jan 1993 – Jul 2026 |
| Michel, M. F. O-3-8382 | Tandem Energy Corporation | Tomball (Schultz SE.) | 2 | 174K | 245K | by Jan 1993 – Aug 2026 |
| Marshall, A. B., Fee O-3-9870 | WRD Operating LLC | Dyersdale, N. (Y-5) | 5 | 168K | 344K | Sep 1994 – Jan 2022 |
| R J S Unit O-3-11101 | WRD Operating LLC | Dyersdale, N. (Y-5) | 6 | 165K | 147K | Jun 1993 – Aug 2026 |
| Pine Village Unit O-3-13699 | WRD Operating LLC | Dyersdale, N. (Y-5) | 2 | 162K | 27K | by Jan 1993 – Aug 2026 |
| Smith, A. -C- O-3-1761 | Trek Resources, Inc. | Goose Creek | 12 | 159K | 27 | by Jan 1993 – Aug 2026 |