| 101 | Flatirons Resources LLC | Westminster, CO 80021 | Oil & Gas Operator | Dec 2022 |
| 102 | Forestar Petroleum Corporation | Denver, CO 80202 | Oil & Gas Operator | May 2017 |
| 103 | Fossil Energy, LLC | Russell, KS 67665 | Oil Operator | Feb 2026 |
| 104 | Four-Way Oper In | | Oil Operator | Aug 1994 |
| 105 | Fourwinds Oil Corporation | Hays, KS 67601 | Oil Operator | Feb 2026 |
| 106 | G L M Company | | Oil Operator | Feb 2026 |
| 107 | Galloway Drillin | | Oil Operator | Dec 1996 |
| 108 | Galloway Drilling Co., Inc. | Wichita, KS 67202 | Oil Operator | Nov 2009 |
| 109 | Gateway Resources, LLC | Wichita, KS 67218 | Oil Operator | Feb 2026 |
| 110 | Gerstner, Joe | Ness City, KS 67560 | Oil Operator | Mar 2016 |
| 111 | Gore Oil Company | Wichita, KS 67202 | Oil & Gas Operator | Feb 2026 |
| 112 | Grady Bolding Corporation | Ellinwood, KS 67526 | Oil & Gas Operator | Feb 2026 |
| 113 | Graham-Michaelis | | Oil & Gas Operator | Nov 1996 |
| 114 | Grand Mesa Operating Company | Wichita, KS 67206 | Oil & Gas Operator | Mar 2026 |
| 115 | Great Eastern Energy & Dev. Corp. | Midland, TX 79701 | Oil & Gas Operator | Jul 2008 |
| 116 | Great Plains Energy, Inc. | Lincoln, NE 68516 | Oil & Gas Operator | Feb 2026 |
| 117 | Great Plains Petroleum, Inc. | Snyder, TX 79549 | Oil & Gas Operator | Feb 2026 |
| 118 | Griggs Oil Incor | | Oil & Gas Operator | May 1994 |
| 119 | H & B Petroleum Corp. | Hutchinson, KS 67504 | Oil & Gas Operator | Feb 2026 |
| 120 | H & C Oil Operat | | Oil & Gas Operator | Dec 1996 |
| 121 | H & C Oil Operating Inc. | Plainville, KS 67663 | Oil & Gas Operator | Feb 2026 |
| 122 | H & H Oil Company | | Oil & Gas Operator | Feb 2026 |
| 123 | H & M Petroleum Corporation | Lincoln, NE 68516 | Oil & Gas Operator | Jun 2025 |
| 124 | Habit Petroleum, LLC | Hays, KS 67601 | Oil Operator | Feb 2026 |
| 125 | Haffner Dan | Hoxie, KS 67740 | Oil Operator | Feb 2026 |
| 126 | Hale, L.D. | Wichita, KS 67230 | Oil Operator | Oct 2019 |
| 127 | Hallwood Petrole | | Oil & Gas Operator | Apr 1999 |
| 128 | Hallwood Petroleum | Denver, CO 80237 | Oil & Gas Operator | Dec 1997 |
| 129 | Hamlin Oil Opera | | Oil Operator | May 1988 |
| 130 | Hansen Dane G TR | | Oil Operator | Feb 1995 |
| 131 | Helberg Oil Comp | | Oil Operator | Mar 1995 |
| 132 | Hellar Drilling | | Oil & Gas Operator | Jan 1994 |
| 133 | Helmerich & Payn | | Oil & Gas Operator | Aug 1995 |
| 134 | Herman L. Loeb LLC | Lawrenceville, IL 62439 | Oil & Gas Operator | Feb 2026 |
| 135 | Hertel Oil Company | | Oil Operator | Jan 2026 |
| 136 | Hertel Oil Company LLC | Hays, KS 67601 | Oil Operator | Feb 2026 |
| 137 | Hess Oil Company | McPherson, KS 67460 | Oil & Gas Operator | Feb 2026 |
| 138 | Hesse Petroleum Co.,L.L.C. | Wichita, KS 67208 | Oil & Gas Operator | Feb 2026 |
| 139 | HG Oil Holdings, LLC | Hoisington, KS 67544 | Oil & Gas Operator | Feb 2026 |
| 140 | High Plains Oil | | Oil Operator | Jun 1989 |
| 141 | Hoffman Resources LLC | Hoisington, KS 67544 | Oil & Gas Operator | Feb 2026 |
| 142 | Holt IVan | | Oil Operator | Mar 1989 |
| 143 | Hoover Noble C | | Oil Operator | Nov 1992 |
| 144 | Hrbek, R. L. | Merino, CO 80741 | Oil & Gas Operator | Jan 2024 |
| 145 | Hub Oil Company | | Oil Operator | Jan 1990 |
| 146 | Hupfer Oil & Gas | Hays, KS 67601 | Oil & Gas Operator | Dec 1993 |
| 147 | Hutchison Jay Oi | | Oil Operator | Sep 1991 |
| 148 | Ia Operating, Inc. | Edmond, OK 73003 | Oil Operator | Feb 2026 |
| 149 | Investment Equipment LLC | FT Morgan, CO 80701 | Oil & Gas Operator | Mar 2026 |
| 150 | J & D Investment | | Oil Operator | Oct 1993 |
| 151 | James P. Williams Enterprises, Inc. | Palco, KS 67657 | Oil Operator | Feb 2026 |
| 152 | Jason Oil Compan | | Oil Operator | Sep 1992 |
| 153 | Jason Oil Company | | Oil Operator | Dec 2014 |
| 154 | Jason Oil Company, LLC | Russell, KS 67665 | Oil Operator | Feb 2026 |
| 155 | Jaspar Co. | Hays, KS 67601 | Oil Operator | Feb 2026 |
| 156 | Jay C. Boyer Oil | | Oil Operator | Nov 2009 |
| 157 | John O. Farmer, Inc. | | Oil & Gas Operator | Dec 1996 |
| 158 | Jolen Operating Company | Oklahoma City, OK 73102 | Oil & Gas Operator | Feb 2026 |
| 159 | K R M Petroleum | | Oil & Gas Operator | Jan 1990 |
| 160 | Kaiser-Francis O | | Oil & Gas Operator | Oct 1995 |
| 161 | Kanaco Oil Company | | Oil Operator | Apr 2025 |
| 162 | Kato Operating C | | Oil Operator | Aug 1988 |
| 163 | Kelso Casing Pul | | Oil Operator | Mar 1995 |
| 164 | Kenbill Oil Comp | | Oil Operator | Jun 1994 |
| 165 | Kimbark Oil & Ga | | Oil & Gas Operator | Aug 1992 |
| 166 | Kiwanda Resc Inc | | Oil & Gas Operator | Aug 1993 |
| 167 | Knighton Oil Company, Inc. | Wichita, KS 67206 | Oil & Gas Operator | Feb 2026 |
| 168 | Koch Exploration | | Oil & Gas Operator | Oct 1988 |
| 169 | Koch Exploration Company | Houston, TX 77046 | Oil & Gas Operator | Apr 2003 |
| 170 | Kracken Operating LLC | Lawrence, KS 66047 | Oil Operator | Dec 2019 |
| 171 | Kruckenberg & SC | | Oil & Gas Operator | Sep 1993 |
| 172 | Ky Oil Co | Palco, KS 67657 | Oil & Gas Operator | Aug 2000 |
| 173 | L & A Oil Compan | | Oil Operator | Sep 1991 |
| 174 | L. D. Drilling, Inc. | Great Bend, KS 67530 | Oil & Gas Operator | Feb 2026 |
| 175 | Landowner | Honolulu, HI | Oil & Gas Operator | Dec 2008 |
| 176 | Lasmo Energy Cor | | Oil Operator | Feb 1990 |
| 177 | Legacy Energy, LLC | Russell, KS 67665 | Oil Operator | Feb 2026 |
| 178 | Leith Operations | | Oil Operator | Jul 1989 |
| 179 | Leroy Holt Oil Operations | | Oil Operator | Mar 2010 |
| 180 | Lloyd Drilling C | | Oil Operator | Aug 1995 |
| 181 | Lloyd Drilling Company | Morland, KS 67650 | Oil Operator | Oct 2009 |
| 182 | LRC Development Corporation | Hays, KS 67601 | Oil Operator | Mar 2009 |
| 183 | M & G Oil Inc | Russell, KS 67665 | Oil Operator | Feb 2026 |
| 184 | M E Klein & Associates, Inc. | Norman, OK 73070 | Oil & Gas Operator | Feb 2026 |
| 185 | Mad Operators LLC | | Oil & Gas Operator | Feb 2026 |
| 186 | Mai Oil Operations, Inc. | Dallas, TX 75225 | Oil & Gas Operator | Feb 2026 |
| 187 | Manta Petroleum, Inc. | Englewood, CO 80155 | Oil & Gas Operator | Jun 2020 |
| 188 | Manuel Corporation | Wichita, KS 67206 | Oil & Gas Operator | Mar 2026 |
| 189 | Mar-Lou Oil Co., LLC | Wilson, KS 67490 | Oil Operator | Feb 2026 |
| 190 | Marmac Petroleum | | Oil & Gas Operator | Oct 1994 |
| 191 | Maxwell Operating Co., Inc. | Englewood, CO 80155 | Oil Operator | Jan 2007 |
| 192 | McCoy Petroleum Corporation | Wichita, KS 67207 | Oil & Gas Operator | Feb 2026 |
| 193 | Meltzer Oil Comp | | Oil Operator | Dec 1983 |
| 194 | Mem Partnership LP, A General Partnership | Spring, TX 77393 | Oil Operator | Feb 2026 |
| 195 | Meridian Energy Inc. | | Oil Operator | Feb 2026 |
| 196 | Mid-Continent En | | Oil & Gas Operator | Nov 1995 |
| 197 | Mid-Continent Energy Corp. | Wichita, KS 67208 | Oil & Gas Operator | Feb 2026 |
| 198 | Mike Kelso Oil, Inc. | Chase, KS 67524 | Oil & Gas Operator | Feb 2026 |
| 199 | MJT Oil | | Oil Operator | Feb 2026 |
| 200 | Mobil Oil Corpor | | Oil & Gas Operator | Dec 1996 |