| Midland AX Fee Unit O-10-46591 | Chevron U. S. A. Inc. only | Spraberry (Trend Area) | Midland | 12 | 1.52M | 6.9M | Oct 2015 – Apr 2026 |
| Texasgulf, Inc. Fee Unit O-3-23450 | Texas Independent Explor Ltd. only | Old Ocean North (10150) | Brazoria | 1 | 743K | 415K | Dec 1997 – Apr 2026 |
| Ector Fee Unit II O-10-21673 | Formentera Operations LLC only | Harper (Ellenburger) | Ector | 3 | 726K | 733K | Jan 1993 – Apr 2026 |
| Fee Unit O-11-66703 | Unitex Oil & Gas, L.L.C. only | Sharon Ridge (1700) | Mitchell | 40 | 428K | 41 | Jan 1993 – Apr 2026 |
| Broughton-McAfee Unit O-3-23401 | Wildfire Energy Operating LLC only | Giddings (Buda) | Robertson | 1 | 237K | 43.1K | Dec 1997 – Mar 2026 |
| Texaco Fee Unit 3 O-6-13152 | HK Energy Operating, LLC only | Brookeland (Austin Chalk, 8800) | Newton | 1 | 182K | 4.18M | Jan 1993 – Nov 2013 |
| Arco Fee Unit A-917 O-6-13343 | Enervest Operating, L.L.C. only | Brookeland (Austin Chalk, 8800) | Jasper | 1 | 175K | 570K | Aug 1994 – Nov 2005 |
| Ector Fee Unit O-10-34363 | Aghorn Operating, Inc. only | Harper (Fusselman) | Ector | 1 | 165K | 242K | Dec 1994 – Feb 2026 |
| Arco Fee Unit A-897 O-6-13336 | BP America Production Company only | Brookeland (Austin Chalk, 8800) | Jasper | 1 | 155K | 1.53M | May 1994 – May 2015 |
| Mobil Fee Unit O-3-20067 | Foundation Energy Management LLC only | Sour Lake | Hardin | 2 | 153K | 51.4K | Jan 1993 – Apr 2026 |
| Arco Fee Unit A-1001 O-6-13517 | Enervest Operating, L.L.C. only | Brookeland (Austin Chalk, 8800) | Jasper | 1 | 149K | 607K | Mar 1995 – Nov 2005 |
| Arco Fee Unit #4 O-6-13479 | Radius Operating, LLC only | Brookeland (Austin Chalk, 8800) | San Augustine | 2 | 132K | 610K | Jun 1995 – Sep 2012 |
| Murfee Unit O-8-27743 | Star Production, Inc. only | Murfee (Canyon Reef) | Jones | 1 | 131K | 275K | Nov 1995 – Aug 2016 |
| Texaco Fee Unit 4 O-6-13154 | Texaco E & P Inc. only | Brookeland (Austin Chalk, 8800) | Newton | 1 | 104K | 1.21M | Feb 1993 – Jan 1995 |
| Lampe-McAfee Unit O-3-21378 | Redbud E & P, Inc. only | Giddings (Austin Chalk-3) | Fayette | 1 | 90K | 1.27M | Jan 1993 – Apr 2026 |
| Ector Fee Unit O-10-36622 | Aghorn Operating, Inc. only | Harper, SE. (Ellen.) | Ector | 1 | 77.5K | 52K | Dec 2000 – Feb 2026 |
| Texaco Fee Unit 5 O-6-13186 | Prize Exploration & Prod, LLC only | Brookeland (Austin Chalk, 8800) | Newton | 2 | 76.8K | 751K | Jun 1993 – Mar 2015 |
| Texaco Fee Unit 2 O-6-13098 | Anadarko E&P Company LP only | Brookeland (Austin Chalk, 8800) | Newton | 3 | 73.7K | 1.2M | Jan 1993 – Aug 2000 |
| Arco Fee Unit 3 O-6-13360 | Radius Operating, LLC only | Brookeland (Austin Chalk, 8800) | San Augustine | 1 | 48.4K | 249K | Nov 1994 – Sep 2012 |
| Vastar Fee Unit A-229 O-6-14149 | Enervest Operating, L.L.C. only | Brookeland (Austin Chalk, 8800) | Jasper | 1 | 27.2K | 328K | Mar 2002 – Nov 2004 |
| Arco Fee Unit A-989 O-6-13808 | Kidd Production Co. only | Brookeland (Austin Chalk, 8800) | Jasper | 1 | 17.7K | 285K | Aug 1997 – Dec 1998 |
| Midland Fee Unit O-10-28490 | Texaco E & P Inc. only | Azalea (Devonian) | Midland | 1 | 16.2K | 193K | Jan 1993 – Aug 1998 |
| Texasgulf, Inc. Fee Unit O-3-23007 | Texas Independent Explor Ltd. only | Old Ocean North (10600) | Brazoria | 2 | 14.8K | 6.5K | Feb 1996 – Jul 1996 |
| Arco Fee Unit O-6-13196 | Union Pacific Resources Company only | Brookeland (Austin Chalk, 8800) | Newton | 2 | 11.8K | 150K | Aug 1993 – Sep 1993 |
| Ector Fee Unit O-10-36827 | Aghorn Operating, Inc. only | Harper (Strawn) | Ector | 1 | 11.2K | 10.1K | Mar 2002 – Aug 2016 |
| Stewart-Menefee Unit III O-1-13317 | Caltex Energy Co. only | Pearsall (Austin Chalk) | Frio | 1 | 8.52K | 27 | Jan 1993 – Apr 2002 |
| Ector Fee Unit O-10-19819 | Gilliam's Aghorn Energy only | Harper, SE. (Ellen.) | Ector | 2 | 8.38K | 20K | Jan 1993 – Jan 1995 |
| Midland Fee Unit O-10-27165 | Texaco E & P Inc. only | Azalea (Strawn) | Midland | 1 | 7.19K | 105K | Jan 1993 – Aug 1998 |
| Mobil Fee Unit O-10-35051 | Southwest Royalties, Inc. only | GMH (Bone Spring) | Ward | 1 | 6.18K | 28.3K | May 1996 – May 1998 |
| Christian,etal/GPC Fee Unit-C-/ O-14-1525 | New-Tex Operating, LLC only | Panhandle Hutchinson County Fld. | Hutchinson | 1 | 3.96K | 7.35K | Jan 1993 – Sep 2002 |
| Glasscock -K- Fee Unit O-10-33069 | H & O Operating Co. Inc. only | Powell (8300) | Glasscock | 1 | 2.57K | 21.3K | Jan 1993 – Oct 1996 |
| Stewart-Menefee Unit IV O-1-12638 | Caltex Energy Co. only | Pearsall (Austin Chalk) | Frio | 1 | 1.92K | 22 | Jan 1993 – Apr 2002 |
| Christian,etal/GPC Fee Unit-A-/ O-14-1528 | Quest-Tex Energy Operating, LLC only | Panhandle Hutchinson County Fld. | Hutchinson | 1 | 1.84K | 3.45K | Jan 1993 – Jul 2003 |
| Reeves TXL Fee Unit O-10-35778 | McDonnold Operating, Inc. only | Cable (Wolfcamp) | Reeves | 1 | 1.51K | 0 | Jan 1997 – Sep 1998 |
| TXL Reagan Fee Unit O-9-4908 | Endeavor Energy Resources L.P. only | Spraberry (Trend Area) | Reagan | 1 | 1.35K | 26.5K | Jan 1993 – Jan 1998 |
| Christian,etal/GPC Fee Unit-E-/ O-14-1712 | Quest-Tex Energy Operating, LLC only | Panhandle Hutchinson County Fld. | Hutchinson | 1 | 499 | 1.43K | Jan 1993 – Sep 1995 |
| Christian, Etal /GPC Fee Unit B/ O-14-1542 | Quest-Tex Energy Operating, LLC only | Panhandle Hutchinson County Fld. | Hutchinson | 1 | 446 | 630 | Jan 1993 – Sep 2002 |
| Stewart-Menefee Unit I O-1-12406 | JB Oil & Gas Well Service only | Pearsall (Austin Chalk) | Frio | 1 | 304 | 19 | Feb 1993 – Aug 2003 |
| Arco Fee Unit A-990 O-6-13854 | Kidd Production Co. only | Brookeland (Austin Chalk, 8800) | Jasper | 2 | 285 | 8.2K | Sep 1998 – Dec 2000 |
| Christian,etal/GPC Fee Unit-D-/ O-14-1647 | New-Tex Operating, LLC only | Panhandle Hutchinson County Fld. | Hutchinson | 1 | 256 | 297 | Jan 1993 – Sep 2002 |
| Arco Fee Unit A-241 O-6-15884 | Atlas Operating LLC only | Brookeland (Austin Chalk, 8800) | Jasper | 1 | 171 | 0 | Apr 2022 – Mar 2025 |
| Mobil Fee Unit O-10-39563 | Jetta Operating Company, Inc. only | Collie (Delaware) | Ward | 1 | 2 | 0 | Nov 2020 – Nov 2020 |
| Arco Fee Unit O-5-3251 | Texaco E & P Inc. only | Cheneyboro (Cotton Valley) | Freestone | 1 | 0 | 0 | — |
| Vastar Fee Unit A-251 O-6-13967 | Rme Petroleum Company only | Brookeland (Austin Chalk, 8800) | Jasper | 1 | 0 | 0 | — |
| Ector Fee Unit O-10-36826 | Energen Resources Corporation only | Harper (Strawn) | Ector | 1 | 0 | 0 | — |
| Ector Fee Unit O-10-19940 | Gilliam's Aghorn Energy only | Harper, SE. (Cisco) | Ector | 1 | 0 | 0 | — |
| Reeves TXL Fee Unit O-10-40740 | McDonnold Operating, Inc. only | Wolfbone (Trend Area) | Reeves | 1 | 0 | 0 | — |
| Burns, F. H Fee Unit O-2-5908 | Wood HI Co., Inc. only | Wood High (Raven) | Victoria | 1 | 0 | 0 | — |