| 26001 | Serio Operating Co. | | Oil & Gas Operator | Mar 2007 |
| 26002 | Serio-Punches Oil Co | | Oil Operator | Jan 2008 |
| 26003 | Serna Inc. | Austin, TX 78733 | Oil Operator | Sep 2026 |
| 26004 | Serra Energy, Inc. | Hailey, ID 83333 | Oil & Gas Operator | May 2011 |
| 26005 | Servco Productio | | Oil Operator | Dec 1992 |
| 26006 | Service Clearing Corp | Dallas, TX 75229 | Oil & Gas Operator | Sep 2026 |
| 26007 | Service Drilling Co. | Tulsa, OK 74119 | Oil & Gas Operator | Oct 1998 |
| 26008 | Service Drilling Co., L.L.C. | Tulsa, OK 74119 | Oil & Gas Operator | Oct 2003 |
| 26009 | Service Production Company, Inc. | Santa Fe, TX 77510 | Oil & Gas Operator | May 1999 |
| 26010 | Ses Oil | | Oil Operator | Jun 2004 |
| 26011 | Ses Production | | Oil & Gas Operator | Oct 2023 |
| 26012 | Sescil, Douglas W. | Akron, NY 14001 | Gas Operator | Dec 2025 |
| 26013 | Sessions Billy C | Muskogee, OK 74401-5323 | Oil Operator | Apr 2007 |
| 26014 | Setex Oil And Gas Company | Houston, TX 77002 | Oil & Gas Operator | Feb 2012 |
| 26015 | Setex Oil Company, L.P. | Houston, TX 77060 | Oil & Gas Operator | Jan 2000 |
| 26016 | Settco Oil & Gas | | Oil & Gas Operator | May 1994 |
| 26017 | Settlers Corporation | Oklahoma City, OK 73116 | Oil & Gas Operator | Nov 2000 |
| 26018 | Settlers Energy Corporation | Oklahoma City, OK 73113 | Oil & Gas Operator | Apr 1998 |
| 26019 | Sev Texas Operating, LLC | Long Beach, CA 90755 | Oil & Gas Operator | Sep 2026 |
| 26020 | Sevarg Company, Inc. | | Oil & Gas Operator | Feb 2016 |
| 26021 | Seven Cross Operating, LLC | Santa Anna, TX 76878 | Oil & Gas Operator | Sep 2026 |
| 26022 | Seven F Operating Inc. | New Braunfels, TX 78131 | Gas Operator | Sep 2026 |
| 26023 | Seven Falls Company | Dallas, TX 75201 | Oil & Gas Operator | May 2008 |
| 26024 | Seven Horses LLC | Alva, OK 73717-5004 | Oil & Gas Operator | Jul 2026 |
| 26025 | Seven J Oil Inc | Jenning, OK 74038-9729 | Oil & Gas Operator | Feb 2026 |
| 26026 | Seven Lakes Operating LLC | Austin, TX 78746 | Oil Operator | Sep 2026 |
| 26027 | Seven Loaves Energy LLC | Conroe, TX 77304 | Oil & Gas Operator | Sep 2026 |
| 26028 | Seven Sisters Oil & Gas LLC | Casper, WY 82602 | Oil & Gas Operator | Jan 2022 |
| 26029 | Seven To One Oil & Gas LLC | Magnolia, OH 44643 | Oil & Gas Operator | Dec 2025 |
| 26030 | Seven Wells Oil & Gas Expl. | Abilene, TX 79601 | Oil & Gas Operator | Jun 2014 |
| 26031 | Seventh Corporation The | Oklahoma City, OK 73107 | Oil & Gas Operator | May 2006 |
| 26032 | Seventy Oil Co. | Freer, TX 78357 | Oil & Gas Operator | Mar 2002 |
| 26033 | Sevenx, LLC | Iowa Park, TX 76367 | Oil Operator | Sep 2026 |
| 26034 | Severtson, James C. | Allegany, NY 14706 | Oil & Gas Operator | Dec 2025 |
| 26035 | Sevitski & Associates Inc | Pryor, OK 74361 | Oil & Gas Operator | Dec 2000 |
| 26036 | Sexton Oil Company | Camden, AR 71701 | Oil Operator | Jan 2025 |
| 26037 | Seydell, E. Morris | Wichita Falls, TX 76307 | Oil Operator | Feb 1993 |
| 26038 | Seymour Oil Co Inc | Edmond, OK 73025 | Oil & Gas Operator | Jul 2011 |
| 26039 | Seymour, James & Lorraine | Cut Bank, MT 59427 | Oil Operator | Jul 2022 |
| 26040 | Sfeop | Midland, TX 79701 | Oil & Gas Operator | Mar 1994 |
| 26041 | SFJV Enterprises, Inc. | Berclair, TX 78107 | Gas Operator | Aug 1998 |
| 26042 | SFM Holdings, Inc. | Dallas, TX 75240 | Oil & Gas Operator | Jul 1995 |
| 26043 | SG Interests I LTD | Houston, TX 77007 | Oil & Gas Operator | May 2026 |
| 26044 | SG Interests, Inc. | Houston, TX 77010 | Oil & Gas Operator | Jun 2007 |
| 26045 | SGB Oil LLC | Luling, TX 78648 | Oil Operator | Sep 2026 |
| 26046 | Sgcu GP LLC | Casper, WY 82602 | Oil Operator | Jul 2026 |
| 26047 | SGP Management LLC | Dallas, TX 75206 | Oil Operator | Jun 2026 |
| 26048 | SGP Operating LLC | Dallas, TX 75205 | Oil & Gas Operator | Sep 2026 |
| 26049 | SH Oil Operations LLC | Wichita, KS 67277 | Oil & Gas Operator | Mar 2026 |
| 26050 | Sha Stephens, Incorporated | Weatherford, TX 76087 | Oil & Gas Operator | Apr 2006 |
| 26051 | Sha-Jam Operating Corp. | Midland, TX 79701 | Oil & Gas Operator | Jul 2026 |
| 26052 | Shack, Bill | Albany, TX 76430 | Oil & Gas Operator | Apr 2006 |
| 26053 | Shackelford Oil Co | Midland, TX 79707 | Oil & Gas Operator | Jul 2026 |
| 26054 | Shackelford,Frank Oil Properties | Midland, TX 79701 | Oil & Gas Operator | Aug 1997 |
| 26055 | Shadawn Corporation | Wichita Falls, TX 76310 | Oil & Gas Operator | Mar 2005 |
| 26056 | Shadco | Worland, WY 82401 | Oil & Gas Operator | Aug 2025 |
| 26057 | Shade Tree Oil C | | Oil Operator | Oct 1987 |
| 26058 | Shadow Wolf Energy LLC | | Oil Operator | Jun 2026 |
| 26059 | Shadow-Del Oil Company | Kiefer, OK 74041-0453 | Oil & Gas Operator | Jul 2015 |
| 26060 | Shadowpeak Operating LLC | Oklahoma City, OK 73159-6905 | Oil & Gas Operator | Jun 2026 |
| 26061 | Shadrack Production Company | | Gas Operator | Dec 1982 |
| 26062 | Shady Oil Co. | Brownwood, TX 76801 | Oil & Gas Operator | Sep 2026 |
| 26063 | Shafer Berman J | Wooster, OH 44691 | Oil & Gas Operator | Dec 2000 |
| 26064 | Shafer David Oil Prod Inc | Wooster, OH 44691 | Oil & Gas Operator | Dec 2000 |
| 26065 | Shaffer Oil Co., Inc. | Burlington, KS 66839 | Oil & Gas Operator | Jul 2001 |
| 26066 | Shaffer Oil Leas | | Oil Operator | May 1993 |
| 26067 | Shag Bark Land And Cattle Co. LLC | Olean, NY 14760 | Oil & Gas Operator | Dec 2021 |
| 26068 | Shahara Oil LLC | Carlsbad, NM 88220 | Oil & Gas Operator | Oct 2000 |
| 26069 | Shaida, John H. | Wichita, KS 67226 | Oil & Gas Operator | Sep 2026 |
| 26070 | Shakespeare Oil Co Inc | Salem, IL 62881 | Oil & Gas Operator | Jun 2026 |
| 26071 | Shale Energy International, LLC | | Oil & Gas Operator | Nov 2024 |
| 26072 | Shale Energy LLC | Jeffersonville, KY 40337 | Oil Operator | Dec 2018 |
| 26073 | Shale Gas Production, LLC | | Oil & Gas Operator | Dec 2021 |
| 26074 | Shale Hunter, LLC | Irving, TX 75039 | Oil & Gas Operator | Jan 2016 |
| 26075 | Shale Oil Co., Inc. | Liberty, TX 77575 | Oil & Gas Operator | Sep 2026 |
| 26076 | Shale Operating Co. | Dallas, TX 75356 | Oil & Gas Operator | Sep 2026 |
| 26077 | Shale Properties LLC | Kingfisher, OK 73750 | Oil Operator | Aug 2023 |
| 26078 | Shale Service, Inc. | | Oil & Gas Operator | Apr 2019 |
| 26079 | Shallow Energy Inc | South Dennis, MA 2660 | Oil & Gas Operator | Feb 2025 |
| 26080 | Shallow Production Oper, LLC | Austin, TX 78738 | Oil Operator | Sep 2026 |
| 26081 | Shamball Oil | | Oil Operator | Apr 2026 |
| 26082 | Shamrock Minerals Corporation | Merkel, TX 79536 | Oil & Gas Operator | Nov 1998 |
| 26083 | Shamrock Oil Co. | Sugar Land, TX 77478 | Oil & Gas Operator | Mar 2008 |
| 26084 | Shamrock Operating Company LLC | Cleveland, OK 74020 | Oil Operator | Aug 2022 |
| 26085 | Shamrock Texas Partners L.P. | San Angelo, TX 76904 | Oil & Gas Operator | Sep 2026 |
| 26086 | Shamrock Well Operations LLC | Oklahoma City, OK 73118-4015 | Oil & Gas Operator | Jul 2026 |
| 26087 | Shana Petroleum Company | Dallas, TX 75206 | Oil & Gas Operator | Aug 2002 |
| 26088 | Shanafelt Oil Operating, LLC | Jacksboro, TX 76458 | Oil Operator | Sep 2026 |
| 26089 | Shanafelt, Arthur | Jacksboro, TX 76458 | Oil & Gas Operator | May 2003 |
| 26090 | Shanahan Donald P | Ridgedale, MO 65739 | Oil & Gas Operator | Dec 1990 |
| 26091 | Shaner W G | Longmont, CO 80503 | Gas Operator | Dec 2021 |
| 26092 | Shanghai Energy Corporation | Houston, TX 77027 | Oil & Gas Operator | Apr 2003 |
| 26093 | Shanks Drilling & Production Company LLC | Bixby, OK 74008 | Oil & Gas Operator | Jun 2026 |
| 26094 | Shanks Robert "Bob" | Haskell, OK 74436-8809 | Oil & Gas Operator | Jun 2023 |
| 26095 | Shanks, Bob | Haskell, OK 74436 | Oil Operator | Sep 2002 |
| 26096 | Shannon Corporation Inc | Okmulgee, OK 74447-1323 | Oil & Gas Operator | Mar 2015 |
| 26097 | Shannon Energy | Liberal, KS 67901 | Oil & Gas Operator | Feb 1999 |
| 26098 | Shannon Petroleum Inc | Tulsa, OK 74136-4603 | Oil & Gas Operator | Oct 2016 |
| 26099 | Shannon Williams | | Oil Operator | Jan 1993 |
| 26100 | Shappell Oil Company | Holliday, TX 76366 | Oil & Gas Operator | Sep 2012 |