| Mansker-Shell Unit G-2-183339 | Hughes, Dan A. Company only | Causey (7870) | Bee | 1 | 34.3K | 1.46M | Jan 2001 – May 2005 |
| Shell Fee 13 G-14-186897 | Presidio Petroleum LLC only | Hemphill (Douglas) | Hemphill | 1 | 34.1K | 568K | Jan 2002 – Jul 2023 |
| Slick, T. B. Estate G-4-191405 | Shell Western E&P only | El Ebanito (LWR Vicksburg Cons) | Starr | 1 | 34K | 1.55M | Apr 2002 – Jun 2003 |
| Southwest Farm & Ranch-State G-4-168572 | Shell Western E&P only | Hinde, West (Marker III Sd.) | Starr | 1 | 33.8K | 2.29M | Dec 1997 – Aug 2005 |
| Christian, Woods G-4-11970 | Shell Western E&P Inc. only | McAllen Ranch (Vicksburg P, Q) | Hidalgo | 1 | 33.5K | 1.65M | Jan 1993 – Nov 1996 |
| McAllen, A. A. "A" G-4-150919 | Shell Western E&P Inc. only | McAllen Ranch (Vicksburg K Cons) | Hidalgo | 1 | 31.4K | 1.54M | Aug 1994 – Nov 1995 |
| McAllen, A.A. G-4-81976 | Shell Western E&P only | McAllen Ranch (Vksbg P-V,s Cons) | Hidalgo | 1 | 30.8K | 2.08M | Jan 1993 – Sep 2003 |
| Shell Fee 17 G-14-266371 | Bracken Operating, L.L.C. only | Hemphill (Granite Wash.) | Hemphill | 1 | 30.4K | 2.19M | Mar 2012 – Mar 2026 |
| Shell Fee 25 G-14-158574 | Chesapeake Operating, Inc. only | Antero (Upper Morrow D) | Hemphill | 1 | 30.4K | 2.26M | Jun 1996 – Jun 2008 |
| Shell G-8-158047 | Interstate Explorations LLC only | Gorman, NW. (Miss.) | Eastland | 1 | 29.5K | 456K | Mar 1996 – Apr 2026 |
| Beaurline, A.W. G-4-163873 | Shell Western E&P only | McAllen Ranch (Vicksburg y, E.) | Hidalgo | 1 | 29.3K | 1.61M | Jul 1997 – May 2000 |
| McAllen, A. A. G-4-60121 | Shell Western E&P only | McAllen Ranch (Vicksburg S, SE.) | Hidalgo | 1 | 28.6K | 1.53M | Jan 1993 – Mar 1998 |
| Hoskinson, Gladys R. Gas Unit 1 G-4-73808 | EOG Resources, Inc. only | Midway, South (Shell Deep) | San Patricio | 1 | 27.2K | 978K | Jan 1993 – Nov 1998 |
| McAllen, A.A. G-4-158636 | Shell Western E&P only | McAllen Ranch (Vksbg P-V,s Cons) | Hidalgo | 1 | 26.6K | 1.92M | Feb 1996 – Sep 2000 |
| Lips, Barbaa "C" G-4-145429 | Shell Western E&P Inc. only | Lopez Ranch (Vksbg 11400) | Brooks | 1 | 26.5K | 529K | Apr 1993 – Aug 1993 |
| Shell Fee 19 G-14-261039 | Mmgl Txph, LLC only | Hemphill (Granite Wash.) | Hemphill | 1 | 26.1K | 1.99M | Feb 2010 – Apr 2026 |
| Slick, T. B. Estate G-4-205382 | Shell Western E&P only | El Ebanito (Yegua) | Starr | 1 | 25.9K | 1.68M | Sep 2004 – Sep 2010 |
| Davis, W.J. G-4-88723 | Shell Western E&P only | Javelina (Vicksburg Cons.) | Hidalgo | 1 | 25K | 1.14M | Mar 1993 – Mar 2005 |
| Palmer State 348 G-4-172385 | Brigham Oil & Gas, L.P. only | Hall-SHELLY(NO.2 Sand) | Brooks | 1 | 24.3K | 106K | Dec 1998 – Oct 2001 |
| Shell Fee 13 G-14-279099 | Presidio Petroleum LLC only | Hemphill (Douglas) | Hemphill | 1 | 23.9K | 1.06M | Nov 2015 – Apr 2026 |
| McAllen Fieldwide Unit G-4-148678 | Shell Western E&P only | McAllen (9400) | Hidalgo | 1 | 23.5K | 932K | Nov 1993 – Nov 2009 |
| Woods Christian G-4-155246 | Shell Western E&P Inc. only | McAllen Ranch (Vicksburg L) | Hidalgo | 1 | 23.4K | 1.22M | Aug 1995 – Jan 1996 |
| Wood Christian G-4-174531 | Shell Western E&P only | McAllen Ranch (Vicksburg N) | Hidalgo | 1 | 22.8K | 544K | Oct 1999 – Apr 2002 |
| McAllen, A. A. G-4-54803 | Shell Western E&P only | McAllen Ranch (Vksbg P-V,s Cons) | Hidalgo | 1 | 22.7K | 712K | Jan 1993 – Dec 2003 |
| Christian, Woods G-4-96191 | Shell Western E&P only | McAllen Ranch (Vicksburg S) | Hidalgo | 1 | 22.2K | 428K | Jan 1993 – Dec 1998 |
| Johnson 54-2-24 Lov G-10-277188 | Shell Western E&P only | Sandbar (Bone Spring) | Loving | 1 | 22.1K | 155K | Apr 2013 – Jun 2015 |
| McAllen, A. A. G-4-110673 | Shell Western E&P only | McAllen Ranch (Vksbg P-V,s Cons) | Hidalgo | 1 | 21.8K | 1.17M | Jan 1993 – Mar 2000 |
| Christian, Woods G-4-166503 | Shell Western E&P only | McAllen Ranch (Vksbg P-V,s Cons) | Hidalgo | 1 | 21.3K | 1.72M | Nov 1997 – Nov 2001 |
| Esparza, Pablo, et al Unit G-4-31290 | Shell Western E&P only | McAllen, South (J-8) | Hidalgo | 1 | 21.1K | 2.38M | Jan 1993 – Oct 2007 |
| Mansker-Shell Unit G-2-183334 | Hughes, Dan A. Company only | Causey (7750) | Bee | 1 | 21K | 611K | Feb 2001 – Jul 2003 |
| McAllen, A. A. G-4-44579 | Shell Western E&P only | McAllen Ranch (Vicksburg S) | Hidalgo | 1 | 20.9K | 880K | Jan 1993 – Oct 2000 |
| Shell E G-4-268961 | Proline Energy Resources Inc only | Midway, South (Consolidated) | San Patricio | 1 | 20.9K | 293K | Oct 2012 – Apr 2026 |
| Shell Fee 57 G-14-262686 | Presidio Petroleum LLC only | Buffalo Wallow (Granite Wash) | Hemphill | 1 | 20.9K | 625K | Feb 2011 – Apr 2026 |
| Christian, Woods G-4-85735 | Shell Western E&P only | McAllen Ranch (Vicksburg S) | Hidalgo | 1 | 20.9K | 1.06M | Jan 1993 – Jan 2000 |
| Shell Fee 57 G-14-262889 | Presidio Petroleum LLC only | Buffalo Wallow (Granite Wash) | Hemphill | 1 | 20.8K | 1.83M | Jun 2011 – Apr 2026 |
| Shell G-4-243618 | Proline Energy Resources Inc only | Midway, South (Consolidated) | San Patricio | 1 | 20.7K | 602K | Aug 2008 – Dec 2025 |
| Shell Fee 13 G-14-268480 | Bracken Operating, L.L.C. only | Buffalo Wallow (Granite Wash) | Hemphill | 1 | 20.3K | 1.5M | Dec 2012 – Mar 2026 |
| Mc Allen,a.a. G-4-57030 | Shell Western E&P only | McAllen Ranch (Vksbg P-V,s Cons) | Hidalgo | 1 | 20.3K | 852K | Dec 1994 – Jan 2007 |
| Pharr Fieldwide Unit G-4-178499 | Shell Western E&P only | Pharr (Hensley) | Hidalgo | 1 | 20.2K | 3.02M | Jun 2000 – May 2010 |
| McAllen, A. A. G-4-158393 | Shell Western E&P only | McAllen Ranch (Vksbg P-V,s Cons) | Hidalgo | 1 | 19.8K | 506K | Apr 1996 – Nov 1996 |
| Mustang Island State Park Tr. 2 G-4-124926 | Lamay Corporation only | Shell Point (Mid. H) | Nueces | 1 | 18.7K | 1.42M | Jan 1993 – Dec 2015 |
| Hanging H 55-1-32 Lov G-10-275867 | Shell Western E&P only | Sandbar (Bone Spring) | Loving | 1 | 17.7K | 229K | Sep 2013 – Jun 2014 |
| State Slick "D" G-4-163624 | Shell Western E&P only | Borosa, S. (T-4) | Starr | 1 | 17.4K | 850K | Jun 1996 – Nov 1997 |
| Lips, Barbara "C" (Ecr) G-4-153647 | Shell Western E&P Inc. only | El Coyote (Vicksburg E-F Cons.) | Brooks | 1 | 16.5K | 581K | Oct 1994 – Apr 1996 |
| McAllen,a.a. G-4-57433 | Shell Western E&P only | McAllen Ranch (Vicksburg S, S.) | Hidalgo | 1 | 16.3K | 617K | Jan 1993 – Apr 1996 |
| Beaurline, A. W. G-4-121251 | Shell Western E&P Inc. only | McAllen Ranch (Guerra) | Hidalgo | 1 | 16.2K | 582K | Jan 1993 – Apr 1996 |
| Pharr Fieldwide Unit G-4-151646 | Shell Western E&P only | McAllen (Hansen) | Hidalgo | 1 | 16.2K | 1.47M | May 1994 – Dec 2009 |
| Woods Christian G-4-135979 | Shell Western E&P only | McAllen Ranch (Vicksburg K Cons) | Hidalgo | 1 | 15.9K | 321K | Jan 1993 – Jan 2000 |
| Boston Texas Land & Trust G-4-159248 | Shell Western E&P only | Javelina (Vicksburg Cons.) | Hidalgo | 1 | 15.5K | 420K | May 1996 – Aug 2003 |
| Beaurline, A. W. G-4-110796 | Shell Western E&P Inc. only | McAllen Ranch(vicksburg-U-V-,se) | Hidalgo | 1 | 15.5K | 430K | Jan 1993 – Nov 1994 |