| McAllen, A. A. G-4-177389 | Merit Energy Company only | McAllen Ranch (Vksbg P-V,s Cons) | Hidalgo | 1 | 6.32K | 305K | May 2000 – May 2017 |
| McAllen Fieldwide Unit G-4-177916 | Totalfinaelf E&P USA Inc only | McAllen (Hackney Lake North) | Hidalgo | 1 | 6.24K | 281K | Mar 2000 – Dec 2001 |
| Jackson -C- O-8-9753 | Sequoia Fossil Fuels, Inc. only | Callahan County Regular | Callahan | 15 | 6.23K | 21 | by Jan 1993 – Apr 1996 |
| Pharr Fieldwide Unit G-4-259373 | Merit Energy Company only | McAllen-Pharr (Consolidated) | Hidalgo | 1 | 6.21K | 457K | Nov 2010 – Aug 2026 |
| Lareata O-8-31694 | Hess, Jerry Operating Co. only | Callahan County Regular | Callahan | 2 | 6.08K | 55K | Oct 2014 – Aug 2016 |
| Pharr Fieldwide Unit G-4-199682 | Merit Energy Company only | McAllen-Pharr (Consolidated) | Hidalgo | 1 | 6.08K | 821K | Aug 2003 – Aug 2026 |
| Foster, Nathan O-8-26048 | Reo Operating LLC only | Callahan County Regular | Callahan | 3 | 6.05K | 54 | by Jan 1993 – Feb 2024 |
| McAllen, A. A. "Slot" G-4-191630 | Merit Energy Company only | McAllen Ranch (Vksbg P-V,s Cons) | Hidalgo | 1 | 6.05K | 168K | Jun 2002 – Aug 2026 |
| McCollum O-8-30238 | US. Fuels, Inc. only | Callahan County Regular | Callahan | 2 | 6.02K | 23.8K | Dec 2008 – Aug 2017 |
| Guerra, A. E. G-4-289944 | Hilcorp Energy Company only | McAllen Ranch (Vksbg P-V,s Cons) | Hidalgo | 1 | 6.01K | 389K | Jul 2016 – Sep 2025 |
| Burnam, M.G., "A" O-8-17354 | 1836 Energy LLC only | Callahan County Regular | Callahan | 6 | 5.97K | 21 | by Jan 1993 – Dec 2022 |
| Baum O-8-27372 | TK Operating only | Callahan County Regular | Callahan | 4 | 5.95K | 28 | Dec 1994 – Dec 2013 |
| McAllen, A. A. G-4-246982 | Hilcorp Energy Company only | McAllen Ranch (Vksbg P-V,s Cons) | Hidalgo | 1 | 5.92K | 771K | Dec 2008 – Aug 2026 |
| South Callaghan Ranch G-4-241986 | Aldine Oil and Gas, LP only | Beccero Creek (Lobo Cons.) | Webb | 1 | 5.91K | 818K | Aug 2008 – Sep 2023 |
| Henderson, E. E. -B- O-8-469 | Wilson Well Service Inc. only | Callahan County Regular | Callahan | 3 | 5.91K | 21 | by Jan 1993 – Aug 2026 |
| McAllen Fieldwide Unit G-4-235324 | Merit Energy Company only | McAllen-Pharr (Consolidated) | Hidalgo | 1 | 5.9K | 1.33M | Feb 2008 – Oct 2021 |
| South Callaghan Ranch G-4-229009 | Aldine Oil and Gas, LP only | Beccero Creek (Lobo Cons.) | Webb | 1 | 5.84K | 1.34M | Jul 2007 – Aug 2026 |
| Cozad C.M. et Al G-4-248015 | Hilcorp Energy Company only | McAllen Ranch (Guerra) | Hidalgo | 1 | 5.83K | 238K | Nov 2008 – Apr 2020 |
| Pharr Fieldwide Unit G-4-152207 | Merit Energy Company only | McAllen-Pharr (Consolidated) | Hidalgo | 1 | 5.8K | 745K | Nov 1994 – Apr 2000 |
| Ross A O-8-9761 | Dara Explorations, LLC only | Callahan County Regular | Callahan | 3 | 5.8K | 113 | by Jan 1993 – Feb 2025 |
| Swoli G-4-200333 | Dewbre Petroleum Corporation only | McAllen Ranch (Guerra, E.) | Hidalgo | 1 | 5.77K | 622K | Oct 2003 – Dec 2016 |
| Millham, Wm., et al -C- O-13-2275 | WLH Production LLC only | Callisburg, SW. (Strawn 3100) | Cooke | 1 | 5.74K | 21 | by Jan 1993 – Jul 2026 |
| Baum O-8-28347 | D.J.F. Services, Inc. only | Callahan County Regular | Callahan | 1 | 5.72K | 0 | Nov 1997 – Jan 2019 |
| South Callaghan Ranch G-4-143917 | Aldine Oil and Gas, LP only | Benavides (Lobo Cons.) | Webb | 1 | 5.69K | 4.66M | by Jan 1993 – Aug 2026 |
| South Callaghan Ranch G-4-236450 | Aldine Oil and Gas, LP only | Beccero Creek (Lobo Cons.) | Webb | 1 | 5.64K | 928K | Feb 2008 – Aug 2026 |
| South Callaghan Ranch G-4-252798 | Aldine Oil and Gas, LP only | Beccero Creek (Lobo Cons.) | Webb | 1 | 5.64K | 907K | Oct 2009 – Aug 2026 |
| South Callaghan Ranch G-4-220735 | Aldine Oil and Gas, LP only | Contempo (Lobo 1) | Webb | 1 | 5.6K | 996K | Mar 2006 – Aug 2026 |
| Guerra, E.E. "A" G-4-125667 | Dewbre Petroleum Corporation only | McAllen Ranch (Guerra) | Hidalgo | 1 | 5.59K | 733K | by Jan 1993 – Aug 2026 |
| Schwartz TG O-9-17513 | Callon Petroleum Operating Co only | Spraberry (Trend Area) | Reagan | 1 | 5.54K | 8.09K | Dec 2011 – Apr 2014 |
| McAllen Fieldwide Unit G-4-172400 | Shell Western E&P only | McAllen, West (Biedenharn, Up.) | Hidalgo | 1 | 5.52K | 581K | Feb 1999 – Sep 2001 |
| McAllen Fieldwide Unit G-4-188005 | Totalfinaelf E&P USA Inc only | McAllen (Consolidated FB-B) | Hidalgo | 1 | 5.51K | 455K | Nov 2001 – Apr 2002 |
| Callow-Beasley-Rogers-Ashton G-6-284969 | Diversified Production LLC only | Carthage (Cotton Valley) | Panola | 1 | 5.5K | 1.58M | Jun 2018 – Aug 2026 |
| McAllen, A. A. G-4-45725 | Shell Western E&P only | McAllen Ranch (Vicksburg S, S.) | Hidalgo | 1 | 5.48K | 329K | by Jan 1993 – Jul 1995 |
| Millham, Wm. O-13-2273 | WLH Production LLC only | Callisburg, SW. (Strawn 2800) | Cooke | 1 | 5.46K | 20 | Feb 1993 – Jul 2026 |
| McAllen, A. A. G-4-267742 | Merit Energy Company only | McAllen Ranch (Vksbg P-V,s Cons) | Hidalgo | 1 | 5.46K | 297K | May 2012 – Aug 2026 |
| Guerra, A. E. G-4-175878 | Hilcorp Energy Company only | McAllen Ranch (Guerra) | Hidalgo | 1 | 5.45K | 1.97M | Jan 2000 – Jun 2011 |
| Pruet, G.S. O-8-342 | Sweet Texas T Energy LLC only | Callahan County Regular | Callahan | 7 | 5.44K | 20 | by Jan 1993 – Jan 2018 |
| Chapman O-8-30070 | Probe Exploration Company only | Callahan County Regular | Callahan | 2 | 5.44K | 9.74K | May 2008 – Apr 2020 |
| Odom, Blan O-8-10702 | Momentum Operating Co., Inc. only | Callahan County Regular | Callahan | 6 | 5.43K | 46 | by Jan 1993 – May 2011 |
| Pharr Fieldwide Unit G-4-189687 | Merit Energy Company only | McAllen-Pharr (Consolidated) | Hidalgo | 1 | 5.43K | 402K | May 2002 – May 2006 |
| Guerra, A. E. G-4-199591 | Hilcorp Energy Company only | McAllen Ranch (Vksbg P-V,s Cons) | Hidalgo | 1 | 5.42K | 612K | Dec 2003 – Feb 2007 |
| Plaster O-13-27410 | 3-R Production, Inc. only | Callendar (Weir) | Jack | 3 | 5.39K | 105 | by Jan 1993 – Feb 1999 |
| South Callaghan Ranch G-4-244719 | Aldine Oil and Gas, LP only | Beccero Creek (Lobo Cons.) | Webb | 1 | 5.39K | 1.3M | Dec 2008 – Aug 2026 |
| Edington, R. E. O-8-362 | K & W Vanpelt Company only | Callahan County Regular | Callahan | 10 | 5.36K | 136 | by Jan 1993 – Oct 2005 |
| Watts, Callie G-13-221276 | Upp Operating, LLC only | Newark, East (Barnett Shale) | Wise | 1 | 5.33K | 940K | Aug 2006 – Jun 2026 |
| Abrams -A- O-8-434 | Hap Oil and Gas LLC only | Callahan County Regular | Callahan | 4 | 5.32K | 194 | by Jan 1993 – Aug 2026 |
| Franke, Wm. O-8-311 | Turner, Greg only | Callahan County Regular | Callahan | 18 | 5.25K | 25 | by Jan 1993 – Feb 2002 |
| McCallum, J.A. Unit I O-3-16953 | Patterson Petroleum LLC only | Kurten (Buda) | Brazos | 1 | 5.23K | 8.32K | by Jan 1993 – Jul 1996 |
| Callaghan Ranch G-4-207604 | Chesapeake Operating, Inc. only | Finley-Webb (Upper Cons) | Webb | 1 | 5.23K | 468K | Feb 2005 – Jan 2010 |
| Beaurline, A. W. G-4-169317 | Gn&j LLC only | McAllen Ranch (Vksbg L-V, N Cons | Hidalgo | 1 | 5.19K | 1.49M | Nov 1997 – Jul 2020 |