| Npu ( Riddle -1 ) G-2-142189 | Devon Energy Production Co, L.P. only | Tulsita-Wilcox (8000) | Goliad | 1 | 35.5K | 1.91M | Jan 1993 – Aug 2000 |
| Mayer State GU G-4-11318 | Riddle Engineering Corp. only | Loma Novia, NE. (Wilcox) | Duval | 1 | 10.6K | 771K | Jan 1993 – Aug 2007 |
| Stovall G-2-173256 | Riddle Engineering Corp. only | Speaks, SW. (Yegua 5413) | Lavaca | 1 | 5.66K | 788K | Mar 1999 – Sep 2004 |
| Puig Gas Unit #2 G-4-36441 | Riddle Engineering Corp. only | Davis (Puig) | Webb | 1 | 2.88K | 163K | Jan 1993 – Sep 2002 |
| Riddle G-13-222900 | BKV North Texas, LLC only | Newark, East (Barnett Shale) | Johnson | 1 | 2.52K | 1.11M | Jul 2006 – Apr 2026 |
| Riddle G-13-265619 | BKV North Texas, LLC only | Newark, East (Barnett Shale) | Johnson | 1 | 2.51K | 3.25M | Oct 2012 – Apr 2026 |
| Westphal G-2-104740 | Riddle Engineering Corp. only | Dornburg (Reklaw 1E) | Goliad | 1 | 2.21K | 338K | Jan 1993 – Feb 2001 |
| Puig Gas Unit 2 G-4-152908 | Riddle Engineering Corp. only | Davis,s. (8000) | Webb | 1 | 2.06K | 208K | Jun 1994 – Sep 2002 |
| Garcia, J. A. et Al G-4-179605 | Riddle Engineering Corp. only | Bloomberg, West (4200) | Hidalgo | 1 | 1.69K | 67.9K | Oct 2000 – Dec 2005 |
| Riddle Tract 6 G-8-193343 | Bayou Operating Company, Inc. only | Morenco (Marble Falls) | Eastland | 1 | 1.57K | 82.6K | Jan 2003 – Apr 2026 |
| Mayer State GU G-4-45983 | Riddle Engineering Corp. only | Loma Novia, NE. (Wilcox) | Duval | 1 | 1.52K | 98.4K | Mar 1994 – Sep 2007 |
| Welder Heirs B-3 G-4-84913 | Riddle Engineering Corp. only | Loma Novia, NE. (Wilcox) | Duval | 1 | 1.13K | 168K | Jan 1993 – Jul 2002 |
| Riddles G-13-225984 | XTO Energy Inc. only | Newark, East (Barnett Shale) | Johnson | 1 | 871 | 812K | Oct 2006 – Dec 2016 |
| Carrl G-4-124201 | Riddle Engineering Corp. only | Los Rubios, E. (Bandera) | Duval | 1 | 838 | 277K | Jan 1993 – Jan 2004 |
| Riddles G-13-267061 | XTO Energy Inc. only | Newark, East (Barnett Shale) | Johnson | 1 | 702 | 583K | Oct 2012 – Apr 2017 |
| V. L. Puig Gas Unit 2 G-4-181032 | Riddle Engineering Corp. only | Davis (Hinnant 1ST, North) | Webb | 1 | 621 | 29.3K | Nov 2000 – Oct 2002 |
| Sabine Gas Unit G-2-198093 | Riddle Engineering Corp. only | Clayton (Derrough) | Live Oak | 1 | 535 | 57.7K | Aug 2003 – Nov 2004 |
| Riddle Tract 6 G-8-129045 | Bayou Operating Company, Inc. only | Morenco (Marble Falls) | Eastland | 1 | 517 | 232K | Jan 1993 – Apr 2026 |
| Garcia Morse Unit G-4-215196 | Riddle Engineering Corp. only | Bloomberg (Frio 5100) | Hidalgo | 1 | 493 | 67.5K | Dec 2005 – Feb 2009 |
| Riddle G-13-265614 | BKV North Texas, LLC only | Newark, East (Barnett Shale) | Johnson | 1 | 117 | 1.45M | Oct 2012 – Apr 2026 |
| Riddle Unit 1 G-8-108794 | Comyn Natural Gas, Inc. only | Marsan (Congl.) | Eastland | 1 | 53 | 92.2K | Jan 1993 – Mar 2026 |
| Garcia, J. A. et Al G-4-217035 | Riddle Engineering Corp. only | Bloomberg (Frio 5100) | Hidalgo | 1 | 51 | 30.7K | Feb 2006 – Sep 2008 |
| Riddle Unit 3 G-8-112983 | Comyn Natural Gas, Inc. only | Marsan (Congl.) | Eastland | 1 | 49 | 346K | Jan 1993 – Mar 2026 |
| Matthew Estate G-2-192712 | Riddle Engineering Corp. only | Brushy Creek, S. (Wilcox 13900) | De Witt | 1 | 46 | 213K | Oct 2001 – Aug 2009 |
| Riddle Unit 2 G-8-108951 | Comyn Natural Gas, Inc. only | Marsan (Congl.) | Eastland | 1 | 33 | 147K | Jan 1993 – Mar 2026 |
| Kalmus G-2-187986 | Riddle Engineering Corp. only | Tiger Bend (Frio 2720) | Lavaca | 1 | 11 | 131K | Jul 2001 – Jul 2003 |
| Riddle G-13-237703 | BKV North Texas, LLC only | Newark, East (Barnett Shale) | Johnson | 1 | 3 | 822K | Jan 2008 – Apr 2026 |
| Riddle G-13-137245 | Ryder Scott Management, LLC only | Boonsville (Bend Congl., Gas) | Wise | 1 | 2 | 150K | Jan 1993 – Jul 2012 |
| Knebel G-2-188137 | Riddle Engineering Corp. only | Ezzell, S. (Frio 2800) | Lavaca | 1 | 1 | 49.7K | Sep 2001 – Jul 2002 |
| Klimitchek, Carl G-2-172644 | Riddle Engineering Corp. only | Ezzell, S. (Frio 2800) | Lavaca | 1 | 1 | 356K | Dec 1998 – Jul 2003 |
| Riddle G-13-48761 | PRC Operating, Inc. only | Jack County Regular (Gas) | Jack | 1 | 0 | 12.9K | Oct 2014 – Mar 2026 |
| Block 71 G-2-136413 | Riddle Engineering Corp. only | Clayton (Block 72 Sd.) | Live Oak | 1 | 0 | 0 | — |
| Sabine G-2-148698 | Riddle Engineering Corp. only | Clayton (Block 72 Sd.) | Live Oak | 1 | 0 | 0 | — |
| Renger, Harvey G-2-169312 | Riddle Engineering Corp. only | Ezzell, S. (Frio 2800) | Lavaca | 1 | 0 | 670K | Apr 1998 – Jun 2006 |
| Klimitchek, Alton G-2-172079 | Riddle Engineering Corp. only | Speaks, N. (2800 SD) | Lavaca | 1 | 0 | 299K | Oct 1998 – Jun 2002 |
| Klimitchek, Alton G-2-191239 | Riddle Engineering Corp. only | Speaks ( 1800) | Lavaca | 1 | 0 | 58.2K | Aug 2002 – Oct 2003 |
| Block 71 G-2-191825 | Riddle Engineering Corp. only | Clayton (Wilcox 7360) | Live Oak | 1 | 0 | 15.9K | Jun 2003 – Oct 2004 |
| Matthew Estate G-2-254044 | Riddle Engineering Corp. only | Helen Gohlke, W. (Yegua) | De Witt | 1 | 0 | 4.52K | Oct 2009 – Jan 2010 |
| Sevier, Clara G-4-9907 | Riddle & Gottlieb only | Clara Driscoll (2100) | Nueces | 1 | 0 | 0 | — |
| Puig Gas Unit #2 G-4-36607 | Riddle Engineering Corp. only | Davis (Hinnant 4TH) | Webb | 1 | 0 | 0 | — |
| Puig Gas Unit 2 G-4-111906 | Riddle Engineering Corp. only | George Buck (4TH Hinnant) | Webb | 1 | 0 | 0 | — |
| Puig Gas Unit 2 G-4-114516 | Riddle Engineering Corp. only | Davis (Hinnant 1ST) | Webb | 1 | 0 | 0 | — |
| Garcia, J.A. Etal G-4-120044 | Riddle Engineering Corp. only | Bloomberg (Sullivan 4000) | Hidalgo | 1 | 0 | 0 | — |
| Garcia, J. A. G-4-166195 | Riddle Engineering Corp. only | Bloomberg (Frio 3900) | Hidalgo | 1 | 0 | 359 | Dec 1997 – Jan 1998 |
| Garcia, J. A. et Al G-4-179606 | Riddle Engineering Corp. only | Wildcat | Hidalgo | 1 | 0 | 0 | — |
| Garcia, J. A. et Al G-4-179607 | Riddle Engineering Corp. only | Wildcat | Hidalgo | 1 | 0 | 0 | — |
| TCGU1 (Riddlesperger "B" -1) G-5-38730 | Enserch Exploration, Inc only | Tri-Cities (Travis Peak Lower) | Henderson | 1 | 0 | 470K | Jan 1993 – May 1997 |
| TCGU1 (Riddlesperger "B" -2) G-5-112193 | Urban Oil & Gas Group, LLC only | Tri-Cities (Travis Peak Lower) | Henderson | 1 | 0 | 1.38M | Jan 1993 – Apr 2026 |
| Riddlesperger, L. R. B G-5-112197 | Urban Oil & Gas Group, LLC only | Tri-Cities (Pettit) | Henderson | 1 | 0 | 0 | — |
| Riddle G-8-81814 | Sterling Oil and Gas only | Lake Mineral Wells (4000 Congl.) | Parker | 1 | 0 | 41.1K | Apr 1995 – Jul 2014 |