| Armstrong Unit B O-2-9758 | Burlington Resources O & G Co LP only | Eagleville (Eagle Ford-2) | Karnes | 5 | 1.44M | 3.76M | Jun 2011 – Jul 2026 |
| Armstrong Unit A O-2-9736 | Burlington Resources O & G Co LP only | Eagleville (Eagle Ford-2) | Karnes | 4 | 1.2M | 3.09M | Aug 2011 – Jul 2026 |
| State Armstrong 9-4 Unit O-10-52567 | Blue Arrow Operating, LLC only | Hoefs T-K (Wolfcamp) | Reeves | 7 | 1.09M | 1.27M | Jun 2019 – Jul 2026 |
| Armstrong Horizontal Unit O-1-18812 | EOG Resources, Inc. only | Eagleville (Eagle Ford-1) | McMullen | 4 | 798K | 409K | Oct 2015 – Jul 2026 |
| Armstrong, Elizabeth M., et AL O-10-18912 | Citation Oil & Gas Corp. only | Block a-34 (Glorieta) | Andrews | 2 | 555K | 29K | Jan 1993 – Jul 2026 |
| Armstrong, Annie "B" O-11-66157 | Apache Corporation only | Emerald (Silurian) | Yoakum | 1 | 510K | 11K | Jan 1993 – May 2010 |
| Buscha-Armstrong Unit O-3-21964 | Magnolia Oil & Gas Operating LLC only | Giddings (Austin Chalk-3) | Fayette | 2 | 497K | 3.85M | Feb 1993 – Jul 2026 |
| Armstrong-Munson Unit O-3-21511 | Magnolia Oil & Gas Operating LLC only | Giddings (Austin Chalk-3) | Fayette | 1 | 492K | 3.69M | Jan 1993 – Jul 2026 |
| Armstrong "48" O-10-35272 | Apache Corporation only | Spraberry (Trend Area) | Midland | 10 | 467K | 818K | Mar 1997 – Jul 2026 |
| Armstrong, Elizabeth O-10-8521 | Shinnery Oil Company, Inc. only | Shafter Lake (San Andres) | Andrews | 9 | 361K | 293K | Jan 1993 – Jul 2026 |
| Armstrong Unit O-5-3552 | Sage Energy Company only | Ici (Georgetown) | Robertson | 1 | 353K | 55.8K | May 1997 – Aug 2000 |
| Schulz-Armstrong Unit O-3-21865 | Magnolia Oil & Gas Operating LLC only | Giddings (Austin Chalk-3) | Fayette | 1 | 342K | 2.35M | Jan 1993 – Jul 2026 |
| Armstrong 149 O-10-46892 | Primexx Operating Corporation only | Wolfbone (Trend Area) | Reeves | 2 | 341K | 497K | Feb 2015 – Aug 2021 |
| Armstrong 36 O-10-43442 | Diamondback E&P LLC only | Spraberry (Trend Area) | Midland | 4 | 292K | 964K | May 2012 – Jul 2026 |
| Armstrong State 4 O-10-46543 | Blue Arrow Operating, LLC only | Hoefs T-K (Wolfcamp) | Reeves | 1 | 282K | 382K | Dec 2014 – Jul 2026 |
| Armstrong "12" O-10-39527 | Petroplex Energy Inc. only | Spraberry (Trend Area) | Martin | 2 | 281K | 800K | May 2009 – Jul 2026 |
| Armstrong, Annie O-11-65765 | XTO Energy Inc. only | Wasson 72 | Yoakum | 2 | 271K | 104K | Jan 1993 – Mar 2024 |
| LW Armstrong O-3-26824 | Wildfire Energy Operating LLC only | Madisonville, W. (Woodbine -A-) | Robertson | 1 | 267K | 62.9K | May 2015 – Jul 2026 |
| State Armstrong 9-4 B O-10-56242 | Blue Arrow Operating, LLC only | Hoefs T-K (Wolfcamp) | Reeves | 1 | 247K | 371K | Mar 2020 – Jul 2026 |
| Armstrong Unit #2H O-5-3583 | Sage Energy Company only | Ici (Georgetown) | Robertson | 1 | 244K | 52.6K | Jul 1997 – Mar 2007 |
| Armstrong, Elizabeth O-10-9945 | Hilcorp Energy Company only | Means, South (Wolfcamp) | Andrews | 7 | 244K | 247K | Jan 1993 – Jul 2026 |
| State Armstrong 9-4 A O-10-56174 | Blue Arrow Operating, LLC only | Hoefs T-K (Wolfcamp) | Reeves | 1 | 240K | 302K | Mar 2020 – Jul 2026 |
| Armstrong, Elizabeth -D- O-10-30022 | Hilcorp Energy Company only | Means, South (Wolfcamp) | Andrews | 3 | 235K | 254K | Jan 1993 – Jul 2026 |
| State Armstrong 9-4 D O-10-60285 | Blue Arrow Operating, LLC only | Hoefs T-K (Wolfcamp) | Reeves | 1 | 209K | 424K | Apr 2020 – Jul 2026 |
| Yeager & Armstrong O-10-9527 | Crescent Energy Operating, LLC only | Fuhrman-Mascho | Andrews | 10 | 180K | 243K | Jan 1993 – Jul 2026 |
| Armstrong, Elizabeth O-10-269 | Coda Energy, Inc. only | Andrews (Wolfcamp) | Andrews | 13 | 174K | 554K | Jan 1993 – Dec 1995 |
| Armstrong, Elizabeth M. et AL O-10-44924 | Citation Oil & Gas Corp. only | Block a-34 (San Andres) | Andrews | 3 | 174K | 58.5K | May 2014 – Jul 2026 |
| Armstrong, Elizabeth O-10-26431 | Extex Operating Company only | Shafter Lake (San Andres) | Andrews | 6 | 136K | 23.3K | Jan 1993 – Jul 2026 |
| Armstrong 12 O-10-43716 | Oxyrock Operating, LLC only | Spraberry (Trend Area) | Midland | 2 | 136K | 377K | Nov 2012 – Jul 2026 |
| Armstrong, Elizabeth -C- O-10-18408 | Hilcorp Energy Company only | Means | Andrews | 3 | 122K | 10.3K | Jan 1993 – Jul 2026 |
| Armstrong-TXL O-10-23721 | Q Natural Resources, LLC only | Ken Regan (Delaware) | — | 3 | 122K | 123K | Jan 1993 – Jul 2026 |
| Armstrong, Elizabeth -D- O-10-27889 | Hilcorp Energy Company only | Means | Andrews | 2 | 121K | 16.7K | Jan 1993 – Jul 2026 |
| Armstrong, Elizabeth -D- O-10-8864 | Ring Energy, Inc. only | Shafter Lake (San Andres) | Andrews | 5 | 120K | 125K | Jan 1993 – Jul 2026 |
| Armstrong, T. M. O-7-6911 | Long Trusts, The only | East Texas | — | 4 | 117K | 1.11K | Jan 1993 – Jul 2026 |
| Armstrong, Eliz. O-10-17908 | Reverence Operating LLC only | Parker (Grayburg, San Andres) | — | 3 | 115K | 20 | Jan 1993 – Jul 2026 |
| Armstrong, M.B. O-14-4411 | Lera only | Panhandle Hutchinson County Fld. | Hutchinson | 17 | 103K | 92K | Jan 1993 – Jul 2026 |
| Armstrong, Charles M. O-4-13273 | Headington Energy Partners, LLC only | Candelaria (Consolidated) | Kenedy | 3 | 94.3K | 673K | Dec 2004 – Jul 2026 |
| Armstrong, Elizabeth -C- O-10-29679 | Hilcorp Energy Company only | Means, South (Wolfcamp) | Andrews | 4 | 93.2K | 192K | Jan 1993 – Jul 2026 |
| Yeager & Armstrong Caruth FM O-10-38936 | Crescent Energy Operating, LLC only | Fuhrman-Mascho | Andrews | 4 | 91.5K | 173K | Aug 2008 – Jul 2026 |
| Armstrong O-10-31403 | Parallel Petroleum LLC only | Means, N. (Queen Sand) | Gaines | 1 | 77.6K | 79.7K | Jan 1993 – Jul 2026 |
| Armstrong, B. F. O-13-14100 | R2Q Operating LLC only | Denison, S. (Woodlake) | — | 1 | 76.8K | 1.95M | Jan 1993 – Jul 2026 |
| Armstrong, Fannie O-3-7695 | McA Petroleum Corporation only | Elm Grove (Arnim -A-) | Fayette | 2 | 73.1K | 21 | Jan 1993 – Jul 2026 |
| Armstrong, Elizabeth M. Etal O-10-26493 | Citation Oil & Gas Corp. only | Block a-34 (Devonian) | Andrews | 1 | 62.4K | 4.67K | Jan 1993 – Jul 2026 |
| Armstrong, Annie "B" O-11-69526 | Hilcorp Energy Company only | Wasson (Wolfcamp) | Yoakum | 1 | 62K | 48.4K | Mar 2010 – Jul 2026 |
| Armstrong Unit O-3-23962 | Baytex Energy USA, Inc. only | Giddings (Buda) | Brazos | 1 | 61.9K | 1.21M | Feb 2001 – Mar 2024 |
| Armstrong O-8-26446 | Clear Water Inc. only | Nolan County Regular | Nolan | 1 | 61.3K | 56 | Jan 1993 – Mar 2021 |
| Armstrong, Charles M. O-4-13139 | Headington Oil Company, L.P. only | Candelaria (G-11) | Kenedy | 1 | 57.8K | 238K | Apr 2002 – Feb 2005 |
| Armstrong O-13-29322 | D L Operating only | Bryson, East | Jack | 1 | 57.7K | 4.44K | Apr 1997 – Jul 2026 |
| Armstrong O-13-23970 | D L Operating only | Dearing (Caddo) | Jack | 1 | 56.2K | 5.8K | Jan 1993 – Jul 2026 |
| Armstrong, Elizabeth -A- O-10-32593 | Coda Energy, Inc. only | Andrews (Pennsylvanian) | Andrews | 1 | 47.1K | 90.8K | Jan 1993 – Dec 1995 |