| Webb County School Board G-4-87366 | Proline Energy Resources Inc only | Mancho Prado (L-1) | Webb | 1 | 22.9K | 1.41M | by Jan 1993 – Dec 2024 |
| Olmitos Ranch G-4-109373 | Proline Energy Resources Inc only | Vaquillas Ranch (Lobo Cons.) | Webb | 1 | 20.9K | 800K | by Jan 1993 – Dec 2025 |
| Garcia, F. G. O-4-1408 | Outline Oil Company LLC only | Killam | Webb | 3 | 15.4K | 16 | by Jan 1993 – Apr 2024 |
| Garcia-Villarreal O-4-1409 | Outline Oil Company LLC only | Killam | Webb | 2 | 14.5K | 18 | by Jan 1993 – May 2024 |
| Webb County School Board G-4-91576 | Proline Energy Resources Inc only | Mancho Prado (L-1) | Webb | 1 | 11.4K | 1.5M | by Jan 1993 – Jan 1999 |
| Olmitos Ranch G-4-111122 | Proline Energy Resources Inc only | Vaquillas Ranch (Lobo Cons.) | Webb | 1 | 10.4K | 1.43M | by Jan 1993 – Feb 2025 |
| Webb County School Board G-4-151412 | Proline Energy Resources Inc only | Big Cowboy (Lobo) | Webb | 1 | 8.22K | 1.37M | Oct 1994 – Jul 2025 |
| Olmitos Ranch G-4-98213 | Proline Energy Resources Inc only | Vaquillas Ranch (Lobo Cons.) | Webb | 1 | 4.71K | 723K | by Jan 1993 – Feb 2025 |
| Olmitos Ranch G-4-96962 | Proline Energy Resources Inc only | Vaquillas Ranch (Lobo Cons.) | Webb | 1 | 3.2K | 890K | by Jan 1993 – Dec 2025 |
| Webb County School Board G-4-172532 | Proline Energy Resources Inc only | Big Cowboy (Lobo) | Webb | 1 | 2.9K | 738K | Feb 1999 – Dec 2024 |
| Brask State 1846 G-4-195086 | Proline Energy Resources Inc only | Gold River, North (Olmos) | Webb | 1 | 2.35K | 944K | Feb 2003 – Dec 2024 |
| Frost Trust G-4-154749 | Proline Energy Resources Inc only | Shockacon (Wilcox 6700) | Webb | 1 | 1.94K | 495K | May 1995 – Aug 2026 |
| Webb County School Board G-4-173370 | Proline Energy Resources Inc only | Mancho Prado (Wilcox, Lo. 7050) | Webb | 1 | 1.44K | 112K | Jun 1999 – Nov 1999 |
| Olmitos Ranch G-4-125362 | Proline Energy Resources Inc only | Vaquillas Ranch (Lobo Cons.) | Webb | 1 | 1.36K | 652K | by Jan 1993 – Feb 2025 |
| Brask State 1846 G-4-202384 | Proline Energy Resources Inc only | Gold River, North (Olmos) | Webb | 1 | 1.12K | 147K | Jul 2004 – Jun 2026 |
| Despain, E. A. G-4-160334 | Proline Energy Resources Inc only | Shockacon (Wilcox 6700) | Webb | 1 | 979 | 554K | Sep 1996 – Aug 2026 |
| Brask Ranch G-4-191412 | Proline Energy Resources Inc only | Gold River, North (Olmos) | Webb | 1 | 964 | 550K | Sep 2002 – Aug 2026 |
| Frost Trust G-4-153706 | Proline Energy Resources Inc only | Shockacon (Wilcox 6700) | Webb | 1 | 800 | 205K | Oct 1994 – Aug 2026 |
| Rachal G-4-218625 | Proline Energy Resources Inc only | Owen (Olmos) | Webb | 1 | 688 | 235K | Mar 2006 – Aug 2026 |
| Davis & Hall O-4-4486 | Coastal Shoreline Corp. only | Que Sera (Mirando) | Webb | 5 | 512 | 20 | by Jan 1993 – Oct 1994 |
| Webb County School Board G-4-194534 | Proline Energy Resources Inc only | Mancho Prado (L-1) | Webb | 1 | 492 | 171K | Apr 2003 – Jun 2026 |
| Rachal G-4-222826 | Proline Energy Resources Inc only | Owen (Olmos) | Webb | 1 | 415 | 129K | Sep 2006 – Aug 2026 |
| Brask Ranch G-4-224965 | Proline Energy Resources Inc only | Gold River, North (Olmos) | Webb | 1 | 361 | 275K | Jan 2007 – Aug 2026 |
| Briscoe-Nunley "A" G-1-268487 | Proline Energy Resources Inc only | Hawkville (Eagleford Shale) | Webb | 1 | 316 | 1.82M | Apr 2011 – Aug 2026 |
| Rachal G-4-208802 | Proline Energy Resources Inc only | Owen (Olmos) | Webb | 1 | 261 | 121K | Mar 2005 – Aug 2026 |
| Brask State 1840 G-4-191894 | Proline Energy Resources Inc only | Gold River, North (Olmos) | Webb | 1 | 218 | 421K | Nov 2002 – Aug 2026 |
| Brask State Unit G-4-194036 | Proline Energy Resources Inc only | Gold River, North (Olmos) | Webb | 1 | 210 | 230K | Mar 2003 – Aug 2026 |
| Brask Ranch G-4-242281 | Proline Energy Resources Inc only | Gold River, North (Olmos) | Webb | 1 | 207 | 146K | Sep 2007 – Aug 2026 |
| Brask State 1846 G-4-190574 | Proline Energy Resources Inc only | Gold River, North (Olmos) | Webb | 1 | 198 | 109K | Aug 2002 – Aug 2026 |
| Brask Ranch G-4-191388 | Proline Energy Resources Inc only | Gold River, North (Olmos) | Webb | 1 | 194 | 44.9K | Sep 2002 – Aug 2005 |
| Rachal G-4-223358 | Proline Energy Resources Inc only | Owen (Olmos) | Webb | 1 | 191 | 194K | Sep 2006 – Aug 2026 |
| Rachal G-4-218588 | Proline Energy Resources Inc only | Owen (Olmos) | Webb | 1 | 156 | 187K | Mar 2006 – Aug 2026 |
| Brask Ranch G-4-195149 | Proline Energy Resources Inc only | Gold River, North (Olmos) | Webb | 1 | 122 | 271K | May 2003 – Aug 2026 |
| Brask Ranch G-4-209649 | Proline Energy Resources Inc only | Gold River, North (Olmos) | Webb | 1 | 108 | 141K | Apr 2005 – Dec 2025 |
| Killam & Hurd, Ltd G-4-62679 | Black Marlin Pipeline Company only | Pescadito SE. (Wilcox Upper) | Webb | 1 | 95 | 0 | Jan 1996 – Jan 1996 |
| Brask Ranch G-4-192473 | Proline Energy Resources Inc only | Gold River, North (Olmos) | Webb | 1 | 86 | 266K | Dec 2002 – Aug 2026 |
| Brask Ranch G-4-205564 | Proline Energy Resources Inc only | Gold River, North (Olmos) | Webb | 1 | 68 | 110K | Sep 2004 – Aug 2026 |
| Frost Trust -17- G-4-208834 | Proline Energy Resources Inc only | Shockacon (Wilcox 6700) | Webb | 1 | 52 | 233K | Jan 2005 – Aug 2026 |
| Frost Trust 29 G-4-203510 | Proline Energy Resources Inc only | Shockacon (Wilcox 6700) | Webb | 1 | 45 | 232K | Jul 2004 – Aug 2026 |
| Brask Ranch G-4-191119 | Proline Energy Resources Inc only | Gold River, North (Olmos) | Webb | 1 | 43 | 258K | Sep 2002 – Aug 2026 |
| Brask State 1846 G-4-191759 | Proline Energy Resources Inc only | Gold River, North (Olmos) | Webb | 1 | 31 | 154K | Nov 2002 – Jul 2006 |
| Brask State 1846 G-4-195074 | Proline Energy Resources Inc only | Gold River, North (Olmos) | Webb | 1 | 30 | 132K | Apr 2003 – Aug 2026 |
| Brask Ranch G-4-196351 | Proline Energy Resources Inc only | Gold River, North (Olmos) | Webb | 1 | 28 | 66K | Aug 2003 – Aug 2026 |
| Brask State 1840 G-4-215800 | Proline Energy Resources Inc only | Gold River, North (Olmos) | Webb | 1 | 21 | 214K | Dec 2005 – Dec 2025 |
| Brask State 1840 G-4-194028 | Proline Energy Resources Inc only | Gold River, North (Olmos) | Webb | 1 | 20 | 248K | Mar 2003 – Aug 2026 |
| Brask Ranch G-4-195944 | Proline Energy Resources Inc only | Gold River, North (Olmos) | Webb | 1 | 17 | 132K | Jun 2003 – Aug 2026 |
| Brask State 1840 G-4-215847 | Proline Energy Resources Inc only | Gold River, North (Olmos) | Webb | 1 | 15 | 142K | Dec 2005 – Feb 2022 |
| Brask State 1846 G-4-223370 | Proline Energy Resources Inc only | Gold River, North (Olmos) | Webb | 1 | 11 | 117K | Nov 2006 – Aug 2026 |
| Brask Ranch G-4-209798 | Proline Energy Resources Inc only | Gold River, North (Olmos) | Webb | 1 | 9 | 56.1K | Apr 2005 – Aug 2026 |
| Brask Ranch G-4-215446 | Proline Energy Resources Inc only | Gold River, North (Olmos) | Webb | 1 | 9 | 23.6K | Dec 2005 – Feb 2017 |