| McLean, Marrs O-4-9832 | Cooper Operating LLC only | Lockhart (Cockfield #2) | Starr | 3 | 112K | 557K | by Jan 1993 – Aug 2026 |
| Zarsky G-4-48645 | L & B Oil and Gas Equipment, LLC only | Lockhart (Cockfield 4, FB A) | Starr | 1 | 6.35K | 450K | by Jan 1993 – Mar 2015 |
| Zarsky O-4-14012 | Texas Valley Oil & Gas, LLC only | Lockhart (Cockfield 4, FB A) | Starr | 1 | 3.52K | 0 | Jan 2015 – Nov 2024 |
| Wardner, G. P., Trustee -E- O-4-5121 | Poor Boy Oilfield Service only | Gregg Wood (1420 Sand) | Starr | 1 | 2.74K | 40 | by Jan 1993 – Apr 1997 |
| Marrs McLean G-4-172985 | Opex Energy, LLC only | Lockhart (Cockfield 4) | Starr | 1 | 2.54K | 373K | May 1999 – Dec 2003 |
| Wardner, G.P. "E" O-4-10364 | Poor Boy Oilfield Service only | El Tanque (1500 Sand) | Starr | 1 | 2.26K | 38 | by Jan 1993 – Apr 1997 |
| Guerra "D" G-4-211582 | Newfield Exploration Company only | La Reforma Deep | Starr | 1 | 2.07K | 154K | Jul 2005 – Nov 2010 |
| Austin, Carlos A. O-4-14023 | L & B Oil and Gas Equipment, LLC only | Lockhart (Cockfield #2) | Starr | 1 | 1.43K | 0 | Mar 2014 – Dec 2019 |
| Wardner O-4-9463 | Poor Boy Oilfield Service only | El Tanque | Starr | 3 | 1.38K | 38 | by Jan 1993 – Apr 1997 |
| Wardner, G. P. Trustee -A- O-4-8489 | Poor Boy Oilfield Service only | El Tanque | Starr | 1 | 1.21K | 37 | by Jan 1993 – Aug 1996 |
| Wardner, G. P., Tse. -F- O-4-6731 | Poor Boy Oilfield Service only | El Tanque | Starr | 2 | 1.21K | 36 | by Jan 1993 – Jan 1996 |
| Wardner, G. P., Trustee O-4-3971 | Poor Boy Oilfield Service only | El Tanque (1500 Sand) | Starr | 1 | 901 | 37 | by Jan 1993 – Jul 1996 |
| Wardner, G. P. -F- O-4-8357 | Poor Boy Oilfield Service only | El Tanque (1580 Sand) | Starr | 1 | 825 | 37 | by Jan 1993 – Jan 1996 |
| Wardner, G. P., Trustee O-4-4013 | Poor Boy Oilfield Service only | El Tanque (1550) | Starr | 1 | 728 | 37 | by Jan 1993 – Jul 1996 |
| Wardner, G. P., Trustee O-4-3833 | Poor Boy Oilfield Service only | El Tanque (1580 Sand) | Starr | 3 | 677 | 37 | by Jan 1993 – Jul 1996 |
| Wardner, G. P. -A- O-4-8490 | Poor Boy Oilfield Service only | El Tanque (1580 Sand) | Starr | 1 | 586 | 37 | by Jan 1993 – Jul 1996 |
| Wardner Trustee O-4-6442 | Poor Boy Oilfield Service only | El Tanque, N. (Frio 1880) | Starr | 1 | 338 | 36 | by Jan 1993 – May 1996 |
| Wardner, G. P. Trustee -C- O-4-4089 | Poor Boy Oilfield Service only | Gregg Wood (1450 Sand) | Starr | 1 | 320 | 36 | by Jan 1993 – May 1996 |
| Wardner, G. P., Trustee -C- O-4-4114 | Poor Boy Oilfield Service only | Gregg Wood (1420 Sand) | Starr | 1 | 318 | 36 | by Jan 1993 – May 1996 |
| Wood, D. G., Sr. -C- O-4-4038 | Poor Boy Oilfield Service only | Gregg Wood (1450 Sand) | Starr | 1 | 312 | 35 | by Jan 1993 – May 1996 |
| Wardner, G. P., Trustee -C- O-4-4176 | Poor Boy Oilfield Service only | Gregg Wood (1280 Sand) | Starr | 1 | 309 | 36 | by Jan 1993 – Jan 1996 |
| Wood, D. G., Sr. -A- O-4-3973 | Poor Boy Oilfield Service only | El Tanque (1500 Sand) | Starr | 2 | 306 | 36 | by Jan 1993 – Jun 1996 |
| Wood, D. G., Sr. O-4-1504 | Poor Boy Oilfield Service only | Leary-Wood (1650 Sand) | Starr | 1 | 297 | 34 | by Jan 1993 – May 1996 |
| Guerra, H. D., Etal O-4-7350 | Poor Boy Oilfield Service only | Lockhart (4400) | Starr | 1 | 290 | 15 | by Jan 1993 – Apr 1994 |
| Wood, D. G., Sr., -C- O-4-4177 | Poor Boy Oilfield Service only | Gregg Wood (1550 Sand) | Starr | 3 | 283 | 36 | by Jan 1993 – May 1996 |
| Wood, D. G., Sr. -A- O-4-3964 | Poor Boy Oilfield Service only | El Tanque | Starr | 3 | 281 | 36 | by Jan 1993 – May 1996 |
| Wood, D. G. -C- O-4-8488 | Poor Boy Oilfield Service only | El Tanque | Starr | 1 | 270 | 35 | by Jan 1993 – May 1996 |
| Wardner Trustee O-4-6513 | Poor Boy Oilfield Service only | El Tanque, N. (1700) | Starr | 2 | 255 | 36 | by Jan 1993 – Jan 1996 |
| Wood, D. G. Sr. O-4-10165 | Poor Boy Oilfield Service only | El Tanque (1580 Sand) | Starr | 1 | 249 | 32 | by Jan 1993 – May 1996 |
| Rodriquez, T. O-4-9533 | Poor Boy Oilfield Service only | Remco (2070 Sand) | Starr | 1 | 213 | 35 | by Jan 1993 – Jan 1996 |
| La Brisa Land & Cattle Co. O-4-8009 | Poor Boy Oilfield Service only | Estralita (3000) | Starr | 1 | 183 | 12 | by Jan 1993 – Dec 1993 |
| Garza, D. L. "A" O-4-7585 | Jilpetco, Inc. only | Lockhart (Cockfield 4) | Starr | 1 | 67 | 7 | Sep 2003 – Mar 2004 |
| Marrs-McLean G-4-44528 | Continental Operating Co. only | Lockhart (Cockfield #2) | Starr | 1 | 33 | 77.8K | by Jan 1993 – Feb 2003 |
| Zarsky, Frank O-4-8909 | Jilpetco, Inc. only | Lockhart (Cockfield 7) | Starr | 1 | 0 | 0 | — |
| Chapa de Vela, Virginia O-4-8415 | Poor Boy Oilfield Service only | Wildcat | Starr | 1 | 0 | 0 | — |
| Wood, D. G., Sr., -C- O-4-4180 | Poor Boy Oilfield Service only | Gregg Wood (1420 Sand) | Starr | 2 | 0 | 3 | Sep 1994 – Nov 1995 |
| Wardner, G. P. Trustee -B- O-4-4091 | Poor Boy Oilfield Service only | El Tanque (1580 Sand) | Starr | 1 | 0 | 0 | — |
| Wardner, G. P., Trustee -B- O-4-4031 | Poor Boy Oilfield Service only | El Tanque (1820) | Starr | 1 | 0 | 0 | — |
| Wood, D. G., Sr. -B- O-4-3963 | Poor Boy Oilfield Service only | El Tanque (1500 Sand) | Starr | 2 | 0 | 6 | Jan 1994 – Jan 1996 |
| Ricaby Estate O-4-3681 | Poor Boy Oilfield Service only | Ricaby, North (2000 Sand) | Starr | 1 | 0 | 0 | — |
| Slick, T. B. O-4-10965 | Poor Boy Oilfield Service only | Rincon, East | Starr | 1 | 0 | 0 | — |
| Coffield, H. H. O-4-3258 | Trinity Energy Corp. only | Ware (Ohern) | Starr | 2 | 0 | 0 | — |
| Wardner, G. P., Trustee -B- O-4-695 | Poor Boy Oilfield Service only | El Tanque | Starr | 1 | 0 | 0 | — |
| Austin, Carlos A. G-4-218687 | L & B Oil and Gas Equipment, LLC only | Lockhart (Cockfield #2) | Starr | 1 | 0 | 9.26K | Mar 2006 – Dec 2006 |
| Davenport G-4-128749 | Poor Boy Oilfield Service only | Hinde, West (Frio 18) | Starr | 1 | 0 | 0 | — |
| Marrs-McLean G-4-126895 | Ceniza Petroleum, Inc. only | Lockhart (Cockfield 4, UP) | Starr | 1 | 0 | 0 | — |
| Wardner D G-4-103962 | Poor Boy Oilfield Service only | El Tanque (500) | Starr | 1 | 0 | 3.87K | Feb 1993 – Apr 1994 |
| Wardner 1-C G-4-102290 | Poor Boy Oilfield Service only | El Tanque (500) | Starr | 1 | 0 | 6.07K | by Jan 1993 – Apr 1994 |
| Thompson, E. A. G-4-42496 | Poor Boy Oilfield Service only | Ricaby ( 800) | Starr | 1 | 0 | 0 | — |
| Thompson, E. A. G-4-42495 | Poor Boy Oilfield Service only | Ricaby ( 800) | Starr | 1 | 0 | 0 | — |