| 1 | S & J Operating Company | Wichita Falls, TX 76301 | Oil & Gas Operator | Mar 2015 |
| 2 | S R W Oil | Laverne, OK 73848 | Oil & Gas Operator | Sep 2025 |
| 3 | Sabre Operating, Inc. | Wichita Falls, TX 76308 | Oil & Gas Operator | Apr 2026 |
| 4 | Sage Drilling Co Inc | Wichita, KS 67202 | Oil & Gas Operator | Nov 1998 |
| 5 | Samedan Oil Corporation | Houston, TX 77067 | Oil & Gas Operator | Dec 2019 |
| 6 | Samis Oil Company, Inc. | Oklahoma City, OK 73156 | Oil & Gas Operator | Sep 2000 |
| 7 | Samson Gas Producing Company | Tulsa, OK 74103 | Oil & Gas Operator | May 2001 |
| 8 | Samson Hydrocarbons Company | Tulsa, OK 74103 | Oil & Gas Operator | Nov 2016 |
| 9 | Samson Resources Company | Tulsa, OK 74103 | Oil & Gas Operator | Jan 2026 |
| 10 | Sand Point Production Inc | Oklahoma City, OK 73172 | Oil & Gas Operator | Jan 2026 |
| 11 | Sandlot Oil & Gas LLC | Gruver, TX 79040 | Oil & Gas Operator | Apr 2026 |
| 12 | Sandridge Exploration And Production LLC | Oklahoma City, OK 73104 | Oil & Gas Operator | Apr 2026 |
| 13 | Sanford Casondra | Ada, OK 74820-4460 | Oil & Gas Operator | May 2013 |
| 14 | Santa Fe Minerals, Inc. | Dallas, TX 75240 | Oil & Gas Operator | Sep 2013 |
| 15 | Saqus Oil Co | Oklahoma City, OK 73107 | Oil & Gas Operator | May 2001 |
| 16 | Scana Exploration Company | Houston, TX 77002 | Oil & Gas Operator | Dec 1999 |
| 17 | Scana Petroleum Resources Inc | Houston, TX 77002 | Oil & Gas Operator | Jun 2013 |
| 18 | Scana Production Company | Houston, TX 77002 | Oil & Gas Operator | Mar 2005 |
| 19 | Scarth Oil & Gas Co | Amarillo, TX 79101 | Oil & Gas Operator | Feb 1999 |
| 20 | Schmid Properties, Inc. | Hico, TX 76457 | Oil & Gas Operator | Apr 2026 |
| 21 | Scout Energy Management LLC | Dallas, TX 75240 | Oil & Gas Operator | Apr 2026 |
| 22 | SCS Newton Oil LLC | Perryton, TX 79070 | Oil & Gas Operator | Apr 2026 |
| 23 | Seagull Energy E & P Inc | Houston, TX 77002 | Oil & Gas Operator | Jan 2015 |
| 24 | Seagull Mid-South Inc | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 25 | Seagull Midcon Inc. | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 26 | Search Drilling Company | Houston, TX 77010 | Oil & Gas Operator | Feb 2001 |
| 27 | Sec Production Inc | Edmond, OK 73013-3709 | Oil & Gas Operator | Feb 2026 |
| 28 | Seneca Oil Company | Tulsa, OK 74121-1518 | Oil & Gas Operator | Jan 2015 |
| 29 | Sensor Oil & Gas, Inc. | Duncan, OK 73534 | Oil & Gas Operator | May 2013 |
| 30 | Service Drilling Co. | Tulsa, OK 74119 | Oil & Gas Operator | Oct 1998 |
| 31 | Service Drilling Co., L.L.C. | Tulsa, OK 74119 | Oil & Gas Operator | Oct 2003 |
| 32 | SGP Management LLC | Dallas, TX 75206 | Oil Operator | Jan 2026 |
| 33 | Shannon Petroleum Inc | Tulsa, OK 74136-4603 | Oil & Gas Operator | Oct 2016 |
| 34 | Shar Alan Oil Company | | Oil & Gas Operator | Oct 2005 |
| 35 | Shell Oil Company | Houston, TX 77210 | Oil & Gas Operator | Apr 2015 |
| 36 | Shell Western Expl & Prod Inc | Houston, TX 77251 | Oil & Gas Operator | Mar 2015 |
| 37 | Sheridan Production Company, LLC | Houston, TX 77056 | Oil & Gas Operator | Jan 2026 |
| 38 | Sho-Bar Energy Inc | Harper, KS 67058 | Oil & Gas Operator | Jan 2026 |
| 39 | Shortgrass Petroleum Inc | Laverne, OK 73848-0139 | Oil & Gas Operator | Jan 2026 |
| 40 | Sidwell Oil & Gas, Inc. | Amarillo, TX 79105 | Oil & Gas Operator | Sep 2014 |
| 41 | Singer-Fleischaker Oil Op Co | Oklahoma City, OK 73102 | Oil & Gas Operator | Apr 2002 |
| 42 | Slawson Donald C | Wichita, KS 67202 | Oil & Gas Operator | Oct 2025 |
| 43 | Slawson Exploration Company Inc | Oklahoma City, OK 73102 | Oil & Gas Operator | Apr 2026 |
| 44 | SM Energy Company | Midland, TX 79707 | Oil & Gas Operator | Apr 2026 |
| 45 | Smokey Trail LLC | Thornton, CO 80241 | Oil & Gas Operator | Feb 2026 |
| 46 | Snelgrooes Oil Company Inc | Maysville, OK 73057-0631 | Oil & Gas Operator | Nov 2014 |
| 47 | Snyder Oil Company | Fort Worth, TX 76102 | Oil & Gas Operator | Mar 2015 |
| 48 | Snyder Oil Corporation | Houston, TX 77024 | Oil & Gas Operator | Mar 2008 |
| 49 | Snyder Partners | Cody, WY 82414 | Oil & Gas Operator | Jan 2026 |
| 50 | Sooner Exploration & Development Co Inc | Enid, OK 73702-3525 | Oil & Gas Operator | Oct 2023 |
| 51 | Sorrels J R Dba Cheyenne Oil Properties | Ponca City, OK 74601 | Oil & Gas Operator | Jul 2022 |
| 52 | South Forty Inc (The) | Laverne, OK 73848 | Oil & Gas Operator | Mar 2015 |
| 53 | Southern Star Central Gas Pipeline Inc | Owensboro, KY 42301 | Oil & Gas Operator | Jan 2026 |
| 54 | Southport Exploration Inc | Tulsa, OK 74103-4015 | Oil & Gas Operator | Nov 1998 |
| 55 | Southwest Royalties, Inc. | Midland, TX 79710 | Oil & Gas Operator | Apr 2026 |
| 56 | Sparks Petroleum Company | Oklahoma City, OK 73128 | Oil & Gas Operator | Mar 1998 |
| 57 | Special Energy Corp. | Stillwater, OK 74076 | Oil & Gas Operator | Apr 2026 |
| 58 | Speller Oil Corporation | Oklahoma City, OK 73112 | Oil & Gas Operator | Feb 2026 |
| 59 | Spencer Oil Company LLC | Bartlesville, OK 74006 | Oil Operator | Jan 2015 |
| 60 | Spess Oil Company Inc | Cleveland, OK 74020-4617 | Oil & Gas Operator | Feb 2026 |
| 61 | St Johns Operating #1 LP | Houston, TX 77060 | Oil & Gas Operator | Aug 2023 |
| 62 | St. Mary Operating Company | Denver, CO 80203 | Oil & Gas Operator | Mar 2019 |
| 63 | Staab Alan R | Tulsa, OK 74114-4213 | Oil & Gas Operator | Sep 2010 |
| 64 | Staghorn Energy, LLC | Tulsa, OK 74103 | Oil & Gas Operator | Jan 2026 |
| 65 | Staghorn Petroleum LLC | Tulsa, OK 74103-3500 | Oil & Gas Operator | Jan 2026 |
| 66 | Staghorn Resources, LLC | Tulsa, OK 74103 | Oil & Gas Operator | Apr 2015 |
| 67 | Stallion Energy, Inc. | Houston, TX 77060 | Oil & Gas Operator | Oct 2017 |
| 68 | Statex Operating, LLC | Dallas, TX 75229 | Oil & Gas Operator | Mar 2007 |
| 69 | Statex Petroleum Inc | Dallas, TX 75229 | Oil & Gas Operator | Dec 2000 |
| 70 | Stephens & Johnson Operating Co. | Wichita Falls, TX 76307 | Oil & Gas Operator | Apr 2026 |
| 71 | Stephens Exploration, Inc. | Dallas, TX 75367 | Oil & Gas Operator | Feb 2026 |
| 72 | Stephens Production Company | The Woodlands, TX 77381 | Oil & Gas Operator | Feb 2026 |
| 73 | Stewart K Petroleum Corp | Edmond, OK 73013 | Oil & Gas Operator | Mar 2015 |
| 74 | Stone Oak Operating LLC | Oklahoma City, OK 73120 | Oil & Gas Operator | Feb 2026 |
| 75 | Strat Land Exploration Company | Tulsa, OK 74103 | Oil & Gas Operator | Jan 2026 |
| 76 | Sullivan & Co. | Tulsa, OK 74114 | Oil & Gas Operator | May 2022 |
| 77 | Sullivan And Company LLC | Tulsa, OK 74119 | Oil & Gas Operator | Jan 2026 |
| 78 | Sundown Energy LP | Dallas, TX 75248 | Oil & Gas Operator | Apr 2026 |
| 79 | Sundown Energy, Inc. | Dallas, TX 75240 | Oil & Gas Operator | May 2025 |
| 80 | Sunterra Energy Corporation | Tulsa, OK 74103 | Oil & Gas Operator | Dec 2009 |
| 81 | Suoco Oil Corporation | Pampa, TX 79066 | Oil & Gas Operator | Apr 2026 |
| 82 | Sweetwater Exploration LLC | Norman, OK 73069-5636 | Oil & Gas Operator | Jan 2026 |
| 83 | SWN Production LLC | Spring, TX 77389-4954 | Oil & Gas Operator | Feb 2022 |
| 84 | Synergex Inc | Oklahoma City, OK 73134 | Oil & Gas Operator | Jan 2026 |