| 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 |
| Arco Fee Unit A-216 G-6-161032 | Atlas Operating LLC only | Brookeland (Austin Chalk, 8800) | Jasper | 1 | 74.9K | 2.98M | Jul 1996 – Aug 2023 |
| 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 A-580 G-6-245707 | Arcadia Energy Resources, LLC only | Brookeland (Austin Chalk, 8800) | Jasper | 1 | 73.3K | 2.37M | Oct 2008 – Apr 2026 |
| Vastar Fee Unit A-109 G-6-189592 | Atlas Operating LLC only | Brookeland (Austin Chalk, 8800) | Jasper | 1 | 72.6K | 1.81M | Dec 2001 – Mar 2026 |
| Arco Fee Unit G-6-151014 | L.C.S. Production Company only | Brookeland (Austin Chalk, 8800) | San Augustine | 1 | 72.6K | 1.93M | Jun 1994 – Sep 2000 |
| Arco Fee Unit A-253 G-6-164325 | Atlas Operating LLC only | Brookeland (Austin Chalk, 8800) | Jasper | 1 | 71.7K | 2.02M | Oct 1996 – Aug 2025 |
| Arco Fee Unit A-920 G-6-153986 | Bonfire Operating LLC only | Brookeland (Austin Chalk, 8800) | Jasper | 1 | 67K | 1.69M | Jul 1994 – Apr 2015 |
| Texasgulf, Inc. Fee Unit G-3-159406 | Texas Independent Explor., Inc. only | Old Ocean North (10150) | Brazoria | 1 | 59.3K | 321K | Mar 1996 – Dec 1997 |
| Donerail 8 Fee Unit G-10-299151 | Coterra Energy Operating Co. only | Derby (Bone Spring) | Culberson | 1 | 57.6K | 378K | Dec 2024 – Apr 2026 |
| Arco Fee Unit A-252 G-6-156391 | Atlas Operating LLC only | Brookeland (Austin Chalk, 8800) | Jasper | 1 | 56.9K | 3.87M | Jun 1995 – Mar 2026 |
| Donerail 8 Fee Unit G-10-299265 | Coterra Energy Operating Co. only | Derby (Bone Spring) | Culberson | 1 | 55.6K | 274K | Dec 2024 – Mar 2026 |
| Arco Fee Unit A-250 G-6-156987 | Rme Petroleum Company only | Brookeland (Austin Chalk, 8800) | Jasper | 1 | 51.1K | 1.33M | Sep 1995 – Apr 2001 |
| Vastar Fee Unit A-215 G-6-175042 | Bonfire Operating LLC only | Brookeland (Austin Chalk, 8800) | Jasper | 1 | 50.2K | 2.37M | Aug 1999 – Jul 2005 |
| Vastar Fee Unit A-311 G-6-188760 | Bonfire Operating LLC only | Brookeland (Austin Chalk, 8800) | Jasper | 1 | 50.1K | 900K | Feb 2002 – Mar 2015 |
| Vastar Fee Unit A-15 G-6-184869 | Atlas Operating LLC only | Brookeland (Austin Chalk, 8800) | Jasper | 1 | 49.7K | 2.8M | Jul 2001 – Mar 2026 |
| 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 G-6-182865 | Rme Petroleum Company only | Brookeland (Austin Chalk, 8800) | Jasper | 1 | 47K | 563K | Mar 2001 – Feb 2002 |
| Vastar Fee Unit A-910 G-6-177403 | Atlas Operating LLC only | Brookeland (Austin Chalk, 8800) | Jasper | 1 | 43.8K | 3.56M | Mar 2000 – Mar 2026 |
| Arco Fee Unit A-214 G-6-163003 | Bonfire Operating LLC only | Brookeland (Austin Chalk, 8800) | Jasper | 1 | 39.4K | 1.33M | Jan 1997 – Sep 2004 |
| Arco Fee Unit A-222 G-6-246168 | Arcadia Energy Resources, LLC only | Brookeland (Austin Chalk, 8800) | Jasper | 1 | 38.5K | 772K | Feb 2009 – Apr 2026 |
| Donerail 8 Fee Unit G-10-299897 | Coterra Energy Operating Co. only | Derby (Bone Spring) | Culberson | 1 | 38.3K | 261K | Dec 2024 – Apr 2026 |
| Arco Fee Unit A-240 G-6-163347 | Atlas Operating LLC only | Brookeland (Austin Chalk, 8800) | Jasper | 1 | 36.2K | 2.81M | Apr 1997 – Mar 2026 |
| Vastar Fee Unit A-913 G-6-189764 | Bonfire Operating LLC only | Brookeland (Austin Chalk, 8800) | Jasper | 1 | 34.8K | 917K | Mar 2002 – Apr 2015 |
| Arco Fee Unit A-908 G-6-149072 | Hereford, J. A. Industries, Inc. only | Brookeland (Austin Chalk, 8800) | Jasper | 1 | 33.3K | 1.11M | Nov 1993 – May 2015 |
| Arco Fee Unit A-15 G-6-163658 | Union Pacific Resources Company only | Brookeland (Austin Chalk, 8800) | Jasper | 1 | 31.5K | 1.34M | Mar 1997 – Jul 1999 |
| 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 |
| Texaco Fee Unit 2 G-6-149931 | Bonfire Operating LLC only | Brookeland (Austin Chalk, 8800) | Newton | 1 | 25.9K | 868K | May 1994 – Apr 2015 |
| Arco Fee Unit A-920 G-6-245692 | Atlas Operating LLC only | Brookeland (Austin Chalk, 8800) | Jasper | 1 | 21.2K | 602K | Dec 2008 – Mar 2026 |
| Arco Fee Unit A-988 G-6-163345 | Bonfire Operating LLC only | Brookeland (Austin Chalk, 8800) | Jasper | 1 | 19.3K | 1.84M | Oct 1996 – May 2015 |
| 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 |
| Reeves TXL Fee Unit G-10-163203 | Chevron U. S. A. Inc. only | Wolfbone (Trend Area) | Reeves | 1 | 16.6K | 94K | Nov 1996 – Mar 2026 |
| 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 |
| Texasgulf, Inc. Fee Unit G-3-92114 | Texas Independent Explor., Inc. only | Old Ocean North (9750) | Brazoria | 1 | 14.5K | 516K | Jan 1993 – Jul 1995 |
| 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 |
| Vastar Fee Unit G-3-171366 | Tri-C Resources, Inc. only | Rat's Nest (Nodosaria) | Orange | 1 | 5.82K | 347K | Aug 1998 – Aug 1999 |
| Arco Fee Unit A-231 G-6-168080 | Anadarko E&P Company LP only | Brookeland (Austin Chalk, 8800) | Newton | 1 | 5.03K | 40.3K | Nov 1997 – Jul 2000 |
| 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 |
| Ncoc Fee Unit G-4-228712 | Merit Energy Company only | Cisco-Benavides (Lobo Cons.) | Zapata | 1 | 3.54K | 1.84M | May 2007 – Apr 2026 |
| 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 |