| Armendaiz et Al G-4-164666 | Mueller Engineering Corp. | Arroyo Colorado (B-4) | 1 | 19 | 20K | Aug 1997 – May 1998 |
| Willamar West Miocene Unit G-4-149253 | Citation Oil & Gas Corp. | Willamar, West (Miocene 4500) | 1 | 13 | 295K | May 1994 – Nov 2001 |
| Gas Unit a Zone 4 G-4-142833 | MW Petroleum Corporation | La Sal Vieja (4) | 1 | 10 | 1.88K | by Jan 1993 – May 1993 |
| Gas Unit a Zone 1 G-4-157670 | Apache Corporation | La Sal Vieja (1 7688-7827) | 1 | 9 | 4.13K | Apr 1996 – Jul 1996 |
| Armendaiz G-4-177652 | Modern Exploration, Inc. | Arroyo Colorado (F-9) | 1 | 7 | 112K | May 2000 – Apr 2002 |
| EP Garcia Ranch G-4-268053 | XTO Energy Inc. | I. Y. Garcia (M-30) | 1 | 6 | 14.5K | Jun 2012 – Sep 2014 |
| Bell, S. H. Sr. Estate G-4-68004 | Citation Oil & Gas Corp. | Willamar, West | 1 | 3 | 208K | by Jan 1993 – Jun 1997 |
| Armendiaz, et al "B" G-4-142587 | Mueller Engineering Corp. | Arroyo Colorado (C-2) | 1 | 3 | 84.7K | by Jan 1993 – Oct 1995 |
| Raymond, Lenora C. G-4-193086 | Citation Oil & Gas Corp. | Willamar, West (Miocene 4500) | 1 | 3 | 41.5K | Feb 2003 – Sep 2003 |
| Armendaiz et Al G-4-150886 | Mueller Engineering Corp. | Arroyo Colorado (B-7) | 1 | 3 | 232K | Jul 1994 – Jun 1997 |
| Bucy G-4-197026 | Citation Oil & Gas Corp. | Willamar, West (Miocene 3890) | 1 | 2 | 1.17M | Sep 2003 – May 2007 |
| Kleberg, R J Jr TR Stillman G-4-150964 | EOG Resources, Inc. | Tordilla (Deep Cons.) | 1 | 2 | 35.7M | Jun 1994 – Jun 2025 |
| Thomas, M.G. et Al G-4-134952 | Exxon Mobil Corporation | Tordilla (M-50,E) | 1 | 0 | 3.26M | by Jan 1993 – Mar 2006 |
| Kleberg, R. J. Jr. Tr. Stillman G-4-243754 | Exxon Mobil Corporation | Tordilla, SW. (J-03) | 1 | 0 | 0 | — |
| Kleberg, R J Jr TR Stillman Past G-4-227876 | Exxon Mobil Corporation | Tordilla (L-43) | 1 | 0 | 50K | May 2007 – May 2008 |
| Yturria G-4-243879 | Texas Oil and Gas Operating, LLC | La Sara (No. 6-A) | 1 | 0 | 219K | Sep 2007 – Mar 2015 |
| Cavazos, Rogerio G-4-138998 | API Operating Co. | Willamar (Rumboogie) | 1 | 0 | 0 | — |
| Yturria, H. G-4-244461 | Apollo Petro Fuels LLC | Raymondville (Consolidated) | 1 | 0 | 1.21K | Aug 2017 – Jan 2018 |
| Kleberg, R.j.jr.tr.stillman G-4-244663 | Exxon Mobil Corporation | Tordilla-NC (L-90E) | 1 | 0 | 423K | Jan 2009 – Mar 2010 |
| Kleberg, R. J. Jr. Tr. Stillman G-4-226766 | Exxon Mobil Corporation | Tordilla (I-47,S) | 1 | 0 | 14K | Mar 2007 – Feb 2008 |
| La Sal Vieja G-4-126029 | Apache Corporation | La Sal Vieja | 1 | 0 | 0 | — |
| Willamar West Miocene Unit G-4-139102 | Citation Oil & Gas Corp. | Willamar, West (Miocene 6300) | 1 | 0 | 0 | — |
| Kleberg, R. J. Jr. Tr. Stillman G-4-140625 | Exxon Mobil Corporation | Tordilla (M-10) | 1 | 0 | 11.9M | by Jan 1993 – Oct 2005 |
| Kleberg, R.J., Stillman Jr.tr. G-4-140638 | Exxon Mobil Corporation | Tordilla (M-10) | 1 | 0 | 19.9M | by Jan 1993 – Jun 2008 |
| Yturria Cattle Co. G-4-120375 | Petroleum Management, Inc. | Lacal (7990) | 1 | 0 | 0 | — |
| Kleberg, R J Jr TR Stillman Past G-4-221470 | Exxon Mobil Corporation | Tordilla-NC (L-90E) | 1 | 0 | 4.34K | Jul 2006 – Aug 2006 |
| Willamar Community "B" G-4-119678 | Citation Oil & Gas Corp. | Willamar (Graben B-3 6040 Sand) | 1 | 0 | 0 | — |
| Kleberg, R J Jr TR Stillman G-4-247972 | EOG Resources, Inc. | Tordilla-NC (K-45, E) | 1 | 0 | 115K | Feb 2009 – May 2012 |
| Kleberg, R J Jr TR Stillman Past G-4-221332 | Exxon Mobil Corporation | Tordilla (L-71) | 1 | 0 | 1.34M | Jun 2006 – May 2008 |
| Kleberg, R.J. Jr TR Stillman G-4-119677 | Exxon Mobil Corporation | Tordilla (M-50) | 1 | 0 | 3.7M | by Jan 1993 – Dec 2000 |
| Stone Westside G-4-221204 | Dewbre Petroleum Corporation | Arroyo Colorado (E-5) | 1 | 0 | 0 | — |
| Willamar Community "E" G-4-119494 | Citation Oil & Gas Corp. | Willamar (E-5 6000 Sand) | 1 | 0 | 0 | — |
| Willamar Community "E" G-4-119248 | Citation Oil & Gas Corp. | Willamar (E-7 6200 Sand) | 1 | 0 | 0 | — |
| Willamar Community "E" G-4-119247 | Citation Oil & Gas Corp. | Willamar (E-7 6300 Sand) | 1 | 0 | 0 | — |
| Kleberg, R. J. Jr. Tr. Stillman G-4-249337 | Exxon Mobil Corporation | Tordilla (I-95) | 1 | 0 | 0 | — |
| Kleberg, R J Jr TR Stillman G-4-250264 | EOG Resources, Inc. | Tordilla-NC (L-90E) | 1 | 0 | 307K | May 2009 – Dec 2010 |
| Willamar West Miocine Unit G-4-116827 | Citation Oil & Gas Corp. | Willamar, West (Miocene 6350) | 1 | 0 | 0 | — |
| Bell, S.H. 'B' G-4-141412 | Exxon Corp. | Willamar (Miocene) | 1 | 0 | 771 | by Jan 1993 – Feb 1993 |
| Yturria L&C Co. NCT-2 G-4-116344 | Texaco E & P Inc. | Raymondville (F-4-C) | 1 | 0 | 0 | — |
| Yturria G-4-218605 | Blakenergy Operating, LLC | La Sara (5500) | 1 | 0 | 69 | Mar 2006 – Apr 2006 |
| Kleberg, R.J. Jr TR Stillman G-4-115147 | Exxon Corp. | Tordilla (J-27) | 1 | 0 | 0 | — |
| Kleberg, R.J. Jr TR Stillman G-4-113790 | Exxon Corp. | Tordilla (J-58) | 1 | 0 | 0 | — |
| Cox, B.F. G-4-251997 | Wagner Oil Company | Wildcat | 1 | 0 | 0 | — |
| Yturria G-4-252098 | Texas Oil and Gas Operating, LLC | Wildcat | 1 | 0 | 0 | — |
| Gas Unit a Zone 8 G-4-112251 | MW Petroleum Corporation | La Sal Vieja (8 9680-9935) | 1 | 0 | 0 | — |
| Kleberg,r.j. Jr TR Stillman G-4-112008 | Exxon Corp. | Tordilla (J-55) | 1 | 0 | 0 | — |
| Henderson, J.W. et al Gas Unit G-4-216711 | Dewbre Petroleum Corporation | Wildcat | 1 | 0 | 0 | — |
| Yturria G-4-253452 | Texas Oil and Gas Operating, LLC | La Sara, E. (8430) | 1 | 0 | 0 | — |
| Gas Unit "a" Zone 6 G-4-110128 | Apache Corporation | La Sal Vieja (6 8774-9165) | 1 | 0 | 0 | — |
| Swanberg G-4-214146 | Kaler Energy Corp. | Wildcat | 1 | 0 | 0 | — |