| Heard, Fannie V. W., Mrs. O-2-2586 | Hilcorp Energy Company only | Tom Oconnor (5500 Sand) | Refugio | 60 | 2.28M | 1.64M | Jan 1993 – Jul 2026 |
| Heard, Fannie V. W., Mrs. O-2-2546 | Hilcorp Energy Company only | Tom Oconnor (4500 Greta Mass.) | Refugio | 46 | 2.17M | 929K | Jan 1993 – Jul 2026 |
| Heard, Fannie, V. W., Mrs. O-2-2874 | Hilcorp Energy Company only | Tom Oconnor (5900 Sand) | Refugio | 43 | 1.63M | 1.67M | Jan 1993 – Jul 2026 |
| Heard, Clement O-2-2585 | Hilcorp Energy Company only | Tom Oconnor (5500 Sand) | Refugio | 20 | 1.34M | 986K | Jan 1993 – Jul 2026 |
| Heard Bower West Unit O-1-15760 | Marathon Oil EF LLC only | Eagleville (Eagle Ford-1) | Atascosa | 9 | 1.26M | 1.48M | Sep 2011 – Jul 2026 |
| Heard, Clement O-2-2873 | Hilcorp Energy Company only | Tom Oconnor (5900 Sand) | Refugio | 22 | 1.22M | 1.07M | Jan 1993 – Jul 2026 |
| Heard Bower Central Unit O-1-15822 | Marathon Oil EF LLC only | Eagleville (Eagle Ford-1) | Atascosa | 7 | 998K | 1.36M | Sep 2011 – Jul 2026 |
| Heard, Fannie V. W. O-2-3977 | Dorchester Operating Company LLC only | Greta (4400) | Refugio | 11 | 887K | 965K | Jan 1993 – Jul 2026 |
| Heard, J. F. B. O-2-3978 | Dorchester Operating Company LLC only | Greta (4400) | Refugio | 17 | 869K | 1.83M | Jan 1993 – Jul 2026 |
| Heard, Claude E. et Al O-2-1798 | Hilcorp Energy Company only | Tom Oconnor (4400) | Refugio | 19 | 760K | 407K | Jan 1993 – Jul 2026 |
| Heard Bower East Unit O-1-15799 | Marathon Oil EF LLC only | Eagleville (Eagle Ford-1) | Atascosa | 6 | 743K | 895K | Nov 2011 – Jul 2026 |
| Heard, Clement O-2-2523 | Hilcorp Energy Company only | Tom Oconnor (4500 Greta Mass.) | Refugio | 16 | 539K | 277K | Jan 1993 – Jul 2026 |
| Heard, J. F. B.- Tex O-2-3996 | Greta Operating Company LLC only | Greta (4400) | Refugio | 15 | 403K | 219K | Jan 1993 – Jul 2026 |
| Heard, Fannie V.W. Mrs. O-2-7813 | Hilcorp Energy Company only | Tom Oconnor (5200, East) | Refugio | 17 | 312K | 705K | Jan 1993 – Jul 2026 |
| Heard, F. V. W. O-2-3994 | Greta Operating Company LLC only | Greta (4400) | Refugio | 3 | 310K | 160K | Jan 1993 – Jul 2026 |
| Heard, F. V. W. O-2-8810 | Dorchester Operating Company LLC only | Greta (F-3 West) | Refugio | 2 | 262K | 207K | Jul 2003 – Jul 2026 |
| Hughes, J.W. FLP O-2-8412 | C & E Operating, Inc. only | Heard Ranch (4800) | Bee | 1 | 252K | 381 | Oct 1998 – May 2014 |
| Heard, Claude E., Etal O-2-2584 | Hilcorp Energy Company only | Tom Oconnor (5500 Sand) | Refugio | 7 | 196K | 433K | Jan 1993 – Jun 2015 |
| Heard, Claude E., et Al O-2-1539 | Hilcorp Energy Company only | Tom Oconnor | Refugio | 12 | 163K | 369K | Jan 1993 – Jul 2026 |
| Heard, Clement O-2-4791 | Hilcorp Energy Company only | Tom Oconnor (7500) | Refugio | 4 | 105K | 332K | Jan 1993 – Oct 2010 |
| Heard, Fannie V.W. Mrs. O-2-6949 | Hilcorp Energy Company only | Tom Oconnor (5625 Sand) | Refugio | 3 | 101K | 157K | Jan 1993 – Mar 2016 |
| Heard Fannie V.W. Mrs O-2-6800 | Hilcorp Energy Company only | Tom O'Connor (4150) | Refugio | 7 | 101K | 892K | Jan 1993 – Sep 2004 |
| Heard, Clement O-2-8936 | Hilcorp Energy Company only | Tom Oconnor (4600) | Refugio | 2 | 95.3K | 56.2K | Nov 2004 – Mar 2018 |
| J.P. Heard-Bower D O-1-15820 | Aurora USA Development, LLC only | Eagleville (Eagle Ford-1) | Atascosa | 1 | 94K | 221K | Feb 2011 – Jul 2014 |
| Heard O-8-24604 | L.C.S. Production Company only | Schick (Bend Conglomerate) | Stonewall | 1 | 88.7K | 4.3K | Jan 1993 – Jun 2015 |
| Heard, S. W., Unit O-13-12537 | Bah-Pepper Operating, LLC only | Hildreth | — | 5 | 86.8K | 21 | Jan 1993 – Jul 2026 |
| Heard, A. W. J. O-2-1349 | Paleo Oil Company LLC only | Refugio Heard (Area) | — | 3 | 85.4K | 89.7K | Jan 1993 – Jul 2026 |
| Heard Bower Central West O-2-11545 | Marathon Oil EF LLC only | Sugarkane (Austin Chalk) | Atascosa | 1 | 83.7K | 240K | Apr 2018 – Jul 2026 |
| Heard, Claude E. et Al O-2-9330 | Hilcorp Energy Company only | Tom Oconnor, N. (5150) | Refugio | 3 | 83.3K | 21.8K | Jun 2009 – Jul 2026 |
| Walthall Estate-Heard Unit O-13-15549 | Ipr Energy Partners, LLC only | Caravan (Caddo -B-) | — | 4 | 80.8K | 1.78K | Jan 1993 – Jul 2026 |
| Heard, J. F. B. O-2-3958 | Acock/Anaqua Operating Co., LP only | Greta (4400) | — | 1 | 77.2K | 142 | Jan 1993 – Sep 2008 |
| Heard-Bower a Unit O-1-15783 | Aurora USA Development, LLC only | Eagleville (Eagle Ford-1) | Atascosa | 1 | 70.8K | 164K | Nov 2011 – Jul 2014 |
| Clement Heard 42 O-2-11813 | Hilcorp Energy Company only | Tom Oconnor (4500 Greta Mass.) | Refugio | 1 | 69.1K | 7.93K | Aug 2019 – Jul 2026 |
| Heard, Mrs. Fannie V. W. O-2-8418 | Hilcorp Energy Company only | Tom Oconnor (5250) | Refugio | 3 | 69K | 106K | Dec 1998 – Jul 2026 |
| Heard, F. V. W. O-2-8731 | Greta Operating Company LLC only | Greta, Deep (5400) | Refugio | 1 | 66.8K | 264K | Aug 2002 – Jul 2026 |
| Heard, Fannie V. W., Mrs. O-2-1541 | Hilcorp Energy Company only | Tom Oconnor | Refugio | 14 | 59.8K | 120K | Jan 1993 – Jul 2026 |
| Heard, C. E. "B" O-2-9220 | Lakeshore Operating, LLC only | Heard Ranch (4300) | Bee | 1 | 45.9K | 416K | May 2008 – Jul 2026 |
| J.F.B. Heard-Arco O-2-11011 | Greta Operating Company LLC only | Greta (4400) | Refugio | 1 | 42.4K | 25K | Oct 2014 – Jul 2026 |
| Gordon O-13-30216 | Lane Operating Company only | Heard (Caddo) | Clay | 3 | 41.5K | 186K | Oct 2003 – Jul 2026 |
| Heard, F.V.W. "B" O-2-8226 | CTR Petroleum, Inc. only | Refugio Heard (5350) | Refugio | 1 | 40.1K | 68.8K | Jan 1997 – Jul 2009 |
| Heard, Jas. M. O-2-1035 | Drachen Oil Company only | Mayo | — | 1 | 35.6K | 338 | Jan 1993 – Jul 2026 |
| Clement Heard 41 O-2-11811 | Hilcorp Energy Company only | Tom Oconnor (4500 Greta Mass.) | Refugio | 1 | 34K | 2.08K | Jul 2019 – Mar 2024 |
| Heard O-13-31794 | Just Oil & Gas, Inc. only | Y-B (Gunsight, Upper) | Young | 6 | 33.7K | 0 | Jan 2011 – Jul 2026 |
| Brand Heirs O-13-14503 | Canyon Oil & Gas LLC only | Heard, S. (Ellenburger -C-) | — | 2 | 32.4K | 21.9K | Jan 1993 – Jul 2026 |
| Garrett Trust O-6-12366 | Valence Operating Company only | Yantis (Heard Zone) | Wood | 1 | 31.1K | 355K | Jan 1993 – Jun 2016 |
| Heard B-1, S. W. O-13-19888 | Cary Oil & Gas, Inc only | Stoneburg | Montague | 1 | 30.6K | 79.5K | Jan 1993 – Jul 2026 |
| Heard, Fannie V. W. O-2-5382 | Primrose Operating Company only | Greta, Deep (5850) | Refugio | 1 | 26.4K | 40.4K | Jan 1993 – Nov 2003 |
| Heard, Ira "B" O-2-9238 | Hilcorp Energy Company only | Tom Oconnor (4400) | Refugio | 1 | 25.3K | 58.1K | Jul 2008 – Jul 2026 |
| Heard, F. V. W. O-2-8920 | Dorchester Operating Company LLC only | Greta, West (F-5) | Refugio | 1 | 22.1K | 26.3K | Oct 2004 – Oct 2024 |
| Wilson Heard 'B' O-2-10161 | Hilcorp Energy Company only | Tom Oconnor | Refugio | 1 | 20.8K | 8.43K | Mar 2012 – Jul 2026 |