| Hobson & Lowe | 101048 | — | 1 | 1 |
| Hockely Energy Inc | 101049 | Houston | 0 | 0 |
| Hogan, G K | 101050 | — | 2 | 1 |
| Hoggan, J Reid | 101051 | — | 2 | 1 |
| Holcomb Oil & Gas Inc | 101052 | Farmington | 0 | 0 |
| Holden Energy Corp | 101053 | Ardmore | 0 | 0 |
| Hollandsworth & Travis Oil | 101054 | Longview | 2 | 1 |
| Hollberg, R J Jr | 101055 | — | 1 | 1 |
| Holly Resources | 101056 | — | 1 | 1 |
| Holmes & McGee | 101057 | — | 1 | 1 |
| Holmes, J W & Hershey Oil | 101058 | Amarillo | 0 | 0 |
| Home Petroleum Corp | 101060 | Denver | 0 | 0 |
| Homeland Gas & Oil, IncActive | 101062 | Roosevelt | 32 | 2 |
| Hondo Oil & Gas Company | 101063 | Roswell | 1 | 1 |
| Honolulu Oil | 101064 | — | 3 | 2 |
| Hope Syndicate | 101065 | — | 1 | 1 |
| Horizon Energy LLC | 101066 | Mayfield | 1 | 1 |
| Horseshoe Energy LLC | 101067 | Littleton | 1 | 1 |
| Hot Rod OilActive | 101069 | Vernal | 6 | 1 |
| Hot Rod OilActive | 101070 | Vernal | 0 | 0 |
| Hough, R M | 101071 | — | 1 | 1 |
| Houston Exploration Co, The | 101072 | Houston | 0 | 0 |
| Houston Oil & Minerals | 101074 | — | 9 | 4 |
| Howell Oil Company | 101075 | Blanding | 14 | 1 |
| Howell, Charles & Fritz E | 101076 | — | 1 | 1 |
| Howell, Clinton K | 101077 | Blanding | 0 | 0 |
| Howell-Wesgra Oil Company | 101078 | Mexican Hat | 0 | 0 |
| HPC Incorporated | 101079 | Denver | 0 | 0 |
| Hrubetz Oil/Steedley Assoc | 101080 | Basin | 1 | 1 |
| Hubbard, Harry P | 101081 | — | 1 | 1 |
| Hugoton Energy Corporation | 101082 | Wichita | 1 | 1 |
| Humble Oil & Refining Co | 101083 | — | 90 | 8 |
| Humbolt | 101084 | — | 1 | 1 |
| Hunt Nelson Bunker | 101085 | — | 1 | 1 |
| Hunt Oil Company | 101086 | Dallas | 6 | 5 |
| Hunt Petroleum AEC Inc | 101087 | Dallas | 1 | 1 |
| Hunt Petroleum Corp | 101088 | — | 1 | 1 |
| Huntford Resources Corp | 101089 | Englewood | 0 | 0 |
| Huroco Inc | 101090 | Salt Lake City | 1 | 1 |
| Hurricane Prod & Refining | 101091 | — | 2 | 1 |
| Husky Oil Company | 101092 | Cody | 18 | 7 |
| Hyland Oil Corporation | 101093 | — | 1 | 1 |
| IACX Energy LLCActive | 101094 | Dallas | 7 | 2 |
| Inca Oil & Gas Inc | 101095 | — | 2 | 1 |
| Independent Producers Mrk | 101096 | Casper | 0 | 0 |
| Industrial Gas Services Inc | 101097 | — | 0 | 0 |
| Inland Fuels Corp | 101098 | — | 8 | 1 |
| Inland Production Company | 101099 | Vernal | 0 | 0 |
| Inland Production Company | 101100 | Myton | 66 | 2 |
| Inland Resources | 101101 | Denver | 0 | 0 |
| Integrated Energy LLC | 101103 | Reno | 0 | 0 |
| Integrated Water Management LLCActive | 101104 | Altamont | 5 | 1 |
| Integrity Financial | 101105 | Los Angeles | 0 | 0 |
| Integrity Financial | 101106 | Roosevelt | 0 | 0 |
| Integrity Financial | 101107 | Roosevelt | 0 | 0 |
| Integrity Oil & Gas Corp | 101108 | Denver | 2 | 1 |
| Intercoast Oil and Gas Co | 101109 | Tulsa | 0 | 0 |
| Interline Resources Corp | 101110 | Casper | 0 | 0 |
| Interline Resources Corp | 101111 | Casper | 0 | 0 |
| Intermountain Nat Res | 101112 | Midvale | 7 | 2 |
| Intermountain Oil & Gas | 101113 | — | 1 | 1 |
| Intermountain Petroleum Co | 101114 | — | 3 | 1 |
| International Consolidated | 101115 | — | 1 | 1 |
| International Oil & Metals | 101117 | — | 2 | 1 |
| International Research | 101118 | — | 0 | 0 |
| Intex Oil Company | 101119 | — | 1 | 1 |
| Intrepid Oil & Gas LLC | 101120 | Denver | 7 | 1 |
| Iowa Tanklines Inc | 101121 | Roosevelt | 0 | 0 |
| IP Petroleum Co Inc | 101122 | Lafayette | 1 | 1 |
| Iriart, JoeActive | 101123 | Price | 1 | 1 |
| Iron Wash Oil & Gas Co | 101124 | — | 0 | 0 |
| Ironwood Exploration Inc | 101126 | — | 4 | 1 |
| ITR Petroleum Inc | 101127 | Denver | 0 | 0 |
| J & L Oil Company | 101128 | Mexican Hat | 10 | 1 |
| J & R Construction Inc | 101129 | Roosevelt | 0 | 0 |
| J C Thompson Operator LLC | 101130 | Greenwood | 3 | 1 |
| J M Huber Corporation | 101131 | Denver | 6 | 2 |
| J-W Operating Company | 101132 | Dallas | 18 | 1 |
| Jack Energy, LLC | 101135 | West Jordan | 1 | 1 |
| Jackson & McGee | 101136 | — | 1 | 1 |
| Jackson, William A | 101137 | Oklahoma City | 0 | 0 |
| Jacobs Drilling Corp | 101138 | Grand Junction | 0 | 0 |
| Jacobs, Ilan L | 101139 | — | 0 | 0 |
| Jacobs, R L Oil & Gas Co | 101140 | Grand Junction | 25 | 2 |
| Jacobs, Thomas & Isabelle | 101141 | Grand Junction | 0 | 0 |
| Jake Oil of Utah LLC | 101142 | Billings | 0 | 0 |
| James B Lindsay & Assoc | 101143 | Salt Lake City | 1 | 1 |
| James, Lloyd | 101144 | — | 1 | 1 |
| Jameson, Charles | 101145 | — | 2 | 1 |
| Javelin Energy Partners Management, LLCActive | 105266 | Irving | 0 | 0 |
| Jay Oil Corporation | 101146 | Denver | 0 | 0 |
| Jed Oil Inc | 101147 | Greenwood Village | 0 | 0 |
| Jelco Energy Inc | 101148 | Rangely | 0 | 0 |
| Jenex Petroleum Corp | 101149 | Denver | 0 | 0 |
| Jenkins & McQueen | 101150 | — | 1 | 1 |
| Jenson, S | 101151 | — | 1 | 1 |
| JFS Management | 101152 | West Jordan | 0 | 0 |
| JK Edwards Associates Inc | 101153 | Denver | 0 | 0 |
| JMD Energy Inc | 101154 | St George | 0 | 0 |
| JN Exploration & Prod | 101155 | Billings | 1 | 1 |
| JN Petroleum Marketing Inc | 101156 | Billings | 0 | 0 |
| John Moore Williams Et Al | 101157 | Salt Lake City | 1 | 1 |
| Johnson Creek Exploration | 101158 | — | 1 | 1 |
| Johnson Livestock Co | 101159 | — | 1 | 1 |
| Johnson, Duayne T | 101160 | West Valley | 0 | 0 |
| Johnson, Roy M | 101161 | — | 6 | 1 |
| Johnston Petroleum Corp | 101162 | Denver | 1 | 1 |
| Jones, Burley M | 101163 | — | 2 | 1 |
| Jones, P D | 101164 | — | 1 | 1 |
| Journey Operating LLC | 101166 | Houston | 20 | 1 |
| Jurassic Oil & Gas Co | 101168 | Rangeley | 0 | 0 |
| K P Kauffman Co Inc | 101169 | Denver | 0 | 0 |
| K S S A Partnership | 101170 | Vernal | 0 | 0 |
| K-T Petroleum Co | 101171 | — | 1 | 1 |
| Kabele, Dale F | 101172 | — | 1 | 1 |
| Kadane, G E & Sons | 101173 | — | 1 | 1 |
| Kaiser Energy Inc | 101174 | Denver | 1 | 1 |
| Kaiser-Francis Corporation | 101175 | Tulsa | 0 | 0 |
| Kaminska, H T | 101176 | — | 1 | 1 |
| Kanab Uranium Corp | 101177 | — | 1 | 1 |
| Karmis Oil & Gas Corp | 101178 | — | 1 | 1 |
| Kaylynn Enterprises | 101179 | Moab | 0 | 0 |
| KCS Medallion Res Inc | 101180 | Tulsa | 0 | 0 |
| KD Drilling Co | 101181 | — | 1 | 1 |
| Kearns, Tom | 101182 | — | 1 | 1 |
| Keas, C L | 101183 | — | 1 | 1 |
| Kellogg, Walter/Trustee | 101184 | Houston | 0 | 0 |
| Kenai Oil & Gas Company | 101185 | Denver | 0 | 0 |
| Kenneth D Luff | 101186 | — | 1 | 1 |
| Kern County Land Co | 101187 | — | 7 | 3 |
| Kerr-McGee Corp | 101188 | — | 2 | 2 |
| Kerr-McGee Oil & Gas Onshore, LP | 101190 | Denver | 1,521 | 2 |
| Kester, Joel | 101191 | Salt Lake City | 0 | 0 |
| Kewanee Oil Co | 101192 | — | 4 | 3 |
| KGH Operating CompanyActive | 101194 | Billings | 4 | 1 |
| Kibbie, William H | 101195 | Salt Lake City | 1 | 1 |
| Kidd Family Partnership LT | 101196 | Dallas | 0 | 0 |
| Kidd, William B | 101197 | — | 1 | 1 |
| Kimball Oil Co | 101198 | — | 2 | 1 |
| Kimbark Expl & Zoller & Da | 101199 | Denver | 1 | 1 |
| Kimbark Oil & Gas Company | 101200 | Denver | 9 | 4 |
| Kimbark Oper/Reserve O&G | 101201 | Denver | 1 | 1 |
| Kimbark Operating | 101202 | Denver | 7 | 2 |
| Kimmridge Four Corners LLC | 101203 | New York | 0 | 0 |
| Kinder Morgan Altamont, LLCActive | 101204 | Houston | 0 | 0 |
| Kinder Morgan Altamont, LLCActive | 101205 | Houston | 0 | 0 |
| King Oil Co | 101206 | — | 3 | 1 |
| King Resources Company | 101207 | Denver | 1 | 1 |
| King, F H | 101208 | — | 1 | 1 |
| King, S D & Son | 101209 | — | 1 | 1 |
| King-Stevenson Gas & Oil | 101210 | Denver | 1 | 1 |
| Kingfish Energy | 101211 | — | 1 | 1 |
| Kings Peak Energy, LLC | 104346 | Denver | 0 | 0 |
| Kingwood Oil Company | 101212 | — | 2 | 1 |
| Kipling Inc | 101213 | Cortez | 2 | 1 |
| Kirby Exploration Company | 101214 | Denver | 1 | 1 |
| Kirby Petroleum Corp | 101215 | Kaufman | 0 | 0 |
| Kirkwood, William C | 101216 | Casper | 21 | 1 |
| Klabzuba Oil & Gas Inc | 101217 | Havre | 1 | 1 |
| Klabzuba Oil & Gas Inc | 101218 | Denver | 0 | 0 |
| Koch Exploration Co | 101219 | Wichita | 29 | 2 |
| Koch Exploration Company LLC | 101220 | Denver | 26 | 1 |
| Koch Hydrocarbon Company | 101221 | Wichita | 0 | 0 |
| Koch Hydrocarbon Company | 101222 | Wichita | 0 | 0 |
| Koch Industries Inc | 101223 | — | 0 | 0 |
| Koch Oil Company | 101224 | Wichita | 0 | 0 |
| KODA GNB, LLCActive | 105777 | Denver | 3,722 | 1 |
| KODA Uinta, LLCActive | 105774 | Denver | 2,310 | 3 |
| Kosanke, Steve | 101225 | La Sal | 1 | 1 |
| KP Operations CorpActive | 101226 | Blanding | 1 | 1 |
| Kralik Oil Co | 101227 | — | 1 | 1 |
| Kubat, Ed J | 101228 | — | 1 | 1 |
| Kubick, John | 101230 | Bokoshe | 0 | 0 |
| Kuphal, H E | 101231 | — | 1 | 1 |
| L B Industries Inc | 101232 | Englewood | 0 | 0 |
| L H Inc | 101233 | — | 1 | 1 |
| L&L Oilfield Services Inc | 101234 | Fruita | 0 | 0 |
| L&W Oil Company | 101235 | Vernal | 0 | 0 |
| La Salle Mineral Company | 101236 | — | 1 | 1 |
| La Verkin Oil Company | 101237 | — | 1 | 1 |
| Lab Energy Inc | 101238 | — | 9 | 1 |
| Lacy, R | 101239 | Longview | 2 | 1 |
| Ladd & Lewis | 101240 | — | 1 | 1 |
| Ladd Petroleum Co | 101241 | — | 6 | 2 |
| Ladd Petroleum Corporation | 101242 | Denver | 6 | 2 |
| Ladd, Lewis & King Res Co | 101243 | Denver | 3 | 1 |
| Lakeside Oil Co | 101244 | — | 1 | 1 |
| Lancaster, J C | 101245 | — | 0 | 0 |
| Landmark Drilling Corp | 101246 | — | 2 | 1 |
| LandmarkSRS 2 | 105733 | Dalton | 0 | 0 |
| Lansdale, A | 101247 | Newport Beach | 28 | 2 |
| Lansdale/Vukasovich | 101248 | Sherman Oaks | 0 | 0 |
| Lantern Petroleum Corp | 101249 | Midland | 0 | 0 |
| Lantern Petroleum Div of | 101250 | Midland | 0 | 0 |
| LaPoint Recycle & Storage | 101251 | LaPoint | 0 | 0 |
| Laprele Exploration Inc | 101252 | — | 1 | 1 |
| Larsen & Richards | 101253 | — | 1 | 1 |
| Larsen Industries | 101254 | — | 2 | 1 |
| Larsen Thomas B | 101255 | — | 0 | 0 |
| Larsen, George N | 101256 | — | 1 | 1 |