| Howell, J. J. G-4-72387 | Shell Western E&P Inc. only | Lacopita (Vicksburg Z 2) | Starr | 1 | 2.15K | 117K | Jan 1993 – Jul 1994 |
| Rochester G-6-278870 | Howell Oil & Gas, Inc. only | Rodessa (Jefferson-Dujie) | Marion | 1 | 2.02K | 113K | May 2014 – Dec 2018 |
| Howell G-8-283057 | Gannett Operating LLC only | Howell (Congl 3900) | Palo Pinto | 1 | 2K | 555K | Aug 2017 – Apr 2026 |
| Howell, Vernon C. O-13-25915 | Howco Energy, Inc. only | Delaware Bend, North (Handy) | Grayson | 1 | 1.96K | 36.4K | Jan 1993 – Oct 1998 |
| Land G-6-144088 | Howell & Sandlin, Inc. only | Rodessa (Hill North) | Cass | 1 | 1.95K | 393K | Jan 1993 – Oct 1998 |
| Beckham, Alvin Gas Unit G-6-205698 | Howell Oil & Gas, Inc. only | Woodlawn (Cotton Valley) | Harrison | 1 | 1.91K | 196K | Sep 2004 – Apr 2018 |
| Roper Howell O-11-69478 | Taylor Oil & Gas Serv only | Spur Lake (Tannehill) | Dickens | 1 | 1.82K | 0 | Feb 2010 – Apr 2026 |
| Howell O-1-17590 | Petrosaurus, Inc. only | La Vernia | Guadalupe | 2 | 1.8K | 0 | Mar 2014 – Aug 2021 |
| Howell O-8-14906 | Gannett Operating LLC only | Set Ranch (Congl) | Palo Pinto | 1 | 1.78K | 107K | Jan 1993 – Apr 2026 |
| Duson G-3-119986 | Howell Petroleum Corporation only | Shanghai (D-1) | Wharton | 1 | 1.66K | 22.4K | Jan 1993 – Oct 1995 |
| Henderson, Garrett G-1-92615 | Howell, David only | Fashing (Edwards Lime -A-) | Atascosa | 1 | 1.65K | 83.3K | Jan 1993 – Jun 1996 |
| Howell G-6-282226 | Diversified Production LLC only | Waskom (Travis Peak 6150) | Harrison | 1 | 1.51K | 389K | Sep 2016 – Apr 2026 |
| Hurley, Eugene O-1-843 | Howell Crane & Rigging, Inc. only | La Vernia | Guadalupe | 3 | 1.5K | 87 | Jan 1993 – Feb 2026 |
| Simmons G-6-159813 | Howell & Sandlin, Inc. only | Woodlawn, N. (Nugent) | Harrison | 1 | 1.39K | 200K | Oct 1996 – Aug 1999 |
| Kubela O-3-20584 | Howell Petroleum Corporation only | Hutchins-Kubela (Frio 4380) | Wharton | 1 | 1.18K | 44 | Jan 1993 – Sep 1993 |
| Hall Unit G-6-145755 | Howell & Sandlin, Inc. only | Rodessa (Hill 5800) | Cass | 1 | 1.12K | 18.7K | May 1993 – Feb 1995 |
| Varisco, A. Estate O-3-18959 | Howell Petroleum Corporation only | Giddings (Austin Chalk-3) | Brazos | 1 | 1.06K | 743 | Jan 1993 – Jun 1993 |
| Alldredge G-6-158994 | Howell & Sandlin, Inc. only | Blocker (Travis Peak) | Harrison | 1 | 1.03K | 222K | May 1996 – Dec 1997 |
| Hurley, Eugene O-1-883 | Howell Crane & Rigging, Inc. only | La Vernia | Guadalupe | 1 | 1.01K | 50 | May 1993 – Feb 2026 |
| Howell G-6-153571 | Diversified Production LLC only | Waskom (Cotton Valley) | Harrison | 1 | 898 | 1.13M | Jan 1995 – Apr 2026 |
| McLeod G-6-145874 | Howell & Sandlin, Inc. only | Rodessa (Hill North) | Cass | 1 | 870 | 64.1K | Jun 1993 – Mar 1997 |
| Howell G-6-172033 | Ocean Energy, Inc. only | Waskom (Travis Peak X-Sand) | Harrison | 1 | 869 | 233K | Jul 1998 – Nov 2000 |
| Coker, Howell E. O-6-11717 | Southwest Operating, Inc.-Tyler only | Toolan (Pettit, Lower) | Nacogdoches | 1 | 844 | 3.77K | Jan 1993 – Apr 2000 |
| Wm. Howell 'B' O-13-32921 | Bend Petroleum Corp. only | Sivells Bend (Ellenberger) | Cooke | 1 | 781 | 0 | Jun 2014 – Aug 2016 |
| Howell G-6-172339 | Sheridan Production Co III, LLC only | Waskom, (Travis Peak, Upper) | Harrison | 1 | 735 | 931K | Jun 1998 – Mar 2022 |
| Howell, A.W. O-13-28711 | Taylor, G. E. only | Alvord (Atoka Conglomerate) | Wise | 1 | 693 | 1.85K | Nov 1993 – Mar 1995 |
| Howell, R. E. L., -G- O-6-2781 | Trident Production, L.L.C. only | Longwood (Goodland Lime) | Harrison | 7 | 674 | 32 | Jan 1993 – Apr 1996 |
| Howell G-13-237375 | Aruba Petroleum, Inc. only | Newark, East (Barnett Shale) | Wise | 1 | 592 | 15.6K | Jan 2008 – Jan 2010 |
| McLeod G-6-146420 | Howell & Sandlin, Inc. only | Rodessa (Hill North) | Cass | 1 | 539 | 43.5K | Jul 1993 – Mar 1996 |
| Howell G-6-168177 | Devon Energy Production Co, L.P. only | Waskom (Cotton Valley) | Harrison | 1 | 506 | 136K | Mar 1997 – Jan 2001 |
| McCreary O-6-14028 | Howell Oil & Gas, Inc. only | Waskom (Tucker Sand) | Harrison | 1 | 433 | 0 | Jul 2000 – Nov 2000 |
| Chapman Ranch "B" G-4-138872 | Apache Corporation only | Mobil-David (Howell Hight) | Nueces | 1 | 376 | 56.7K | Jan 1993 – Sep 1993 |
| Duson G-3-146835 | Howell Petroleum Corporation only | Shanghai (D-5) | Wharton | 1 | 304 | 53.7K | Jul 1993 – Mar 1994 |
| Glenn, J. M. G-8-143869 | Howell, Ray only | Breckenridge,se (Congl) | Stephens | 1 | 278 | 2.06K | Apr 1993 – Apr 1995 |
| Duson, W. W. -D- O-3-2459 | Howell Petroleum Corporation only | Hutchins-Kubela (Gilcrease Sd.) | Wharton | 10 | 215 | 1 | Aug 1993 – Aug 1993 |
| Howell G-14-192367 | Mmgl Txph, LLC only | Mendota, S. E. (Morrow Upper) | Hemphill | 1 | 207 | 63.8K | Nov 2002 – May 2003 |
| Howell, A. W. G-13-47494 | Taylor, G. E. only | Alvord (Atoka Conglomerate) | Wise | 1 | 206 | 1.09K | Jan 1993 – Oct 1993 |
| Kubela Mineral Trust G-3-143122 | Howell Petroleum Corporation only | Hutchins-Kubela (5520) | Wharton | 1 | 197 | 25.2K | Jan 1993 – Feb 1994 |
| Howell G-6-179745 | Diversified Production LLC only | Waskom (Travis Peak 1) | Harrison | 1 | 167 | 77K | Oct 2000 – Nov 2006 |
| Arco Etal Humble Fee Gas Unit G-4-101266 | Columbus Energy, LLC only | Seven Sisters, E. (Howell Sand) | Duval | 1 | 164 | 19M | Jan 1993 – Apr 2026 |
| Howell G-6-183028 | Devon Energy Production Co, L.P. only | Waskom (Travis Peak 1) | Harrison | 1 | 163 | 89.9K | Jan 2001 – Aug 2005 |
| Howell, Ruth G-6-121791 | SDG Operating Company, Inc only | Joaquin (Pettit, Lower) | Shelby | 1 | 138 | 168K | Jan 1993 – May 2011 |
| Howell G-6-152326 | Seagull Energy E&P Inc. only | Waskom (Travis Peak 7) | Harrison | 1 | 126 | 460K | Nov 1994 – Jun 1998 |
| Hazlewood Gas Unit G-4-106182 | Columbus Energy, LLC only | Seven Sisters, E. (Howell Sand) | Duval | 1 | 115 | 11M | Jan 1993 – Apr 2026 |
| Holt G-6-144958 | Howell & Sandlin, Inc. only | Rodessa (Hill North) | Cass | 1 | 104 | 35.6K | Jan 1993 – Mar 1997 |
| Howell G-6-124448 | Diversified Production LLC only | Waskom (Travis Peak X-Sand) | Harrison | 1 | 86 | 47.3K | Jan 1993 – Feb 2000 |
| Duson -B- O-3-2457 | Howell Petroleum Corporation only | Hutchins-Kubela (Gilcrease Sd.) | Wharton | 3 | 55 | 1 | Jan 1994 – Jan 1994 |
| Howell G-2-158777 | American Coastal Energy, Inc. only | Francitas, North (7480) | Jackson | 1 | 54 | 3.95K | Feb 1996 – Nov 1997 |
| Brazos Bottom O-3-19575 | Howell Petroleum Corporation only | Kurten (Buda) | Brazos | 1 | 52 | 2 | Jan 1993 – Feb 1993 |
| Glenn Melvin G-8-64080 | Howell, Virginia C. Estate Of only | Stephens County Regular (Gas) | Stephens | 1 | 48 | 419K | Jan 1993 – Jul 2024 |