| Name | Country | Market Cap (US$) |
|---|
| Delta Western, Inc | United States | Private |
| Deme Offshore Services B.V. | Netherlands | Private |
| Den Hartog B.V. | Netherlands | Private |
| Denbury Management, Inc. | United States | Private |
| Denbury Onshore Llc | United States | Private |
| Denbury Resources Management Inc | United States | Private |
| Denerco Oil A/S | Denmark | Private |
| Dennis K. Burke Inc. | United States | Private |
| Dennison Lubricants | United States | Private |
| Denson Oil Co Inc | United States | Private |
| Department Of Public Utilities City Of Orangeburg | United States | Private |
| DERFELL PTY. LIMITED | Australia | Private |
| DESOMIT SRL | Italy | Private |
| Destileria Argentina de Petroleo S.A. | Argentina | Private |
| Destiny Resource Services Inc | United States | Private |
| Destiny Resource Services Partnership | Canada | Private |
| DEUTAG LTD | United Kingdom | Private |
| Deutsche BP AG | Germany | Private |
| Deutsche Castrol-Industrieöl Gesellschaft mit beschränkter Haftu | Germany | Private |
| Deutsche Exxon Chemical GmbH | Germany | Private |
| Deutsche Shell AG | Germany | Private |
| Deutsche Shell Chemie GmbH | Germany | Private |
| Deutsche Tamoil GmbH | Germany | Private |
| Deutsche Tiefbohr-AG (Deutag) | Germany | Private |
| Deutscher Kraftverkehr Ernst Grimmke | Germany | Private |
| DEVILLE-MAZOUT Sŕrl | Switzerland | Private |
| Devon Canada Corporation | Canada | Private |
| Devon Energy International Company | United States | Private |
| Devon Mnd Energy Corporation | United States | Private |
| Devon Oei Operating, Inc | United States | Private |
| Devon SFS Operating, Inc. | United States | Private |
| Devx Energy Inc | United States | Private |
| DHS Drilling Company | United States | Private |
| DI PROPERZIO COMMERCIALE SRL | Italy | Private |
| Dial Oil Co | United States | Private |
| DIALOG E & C SDN BHD | Malaysia | Private |
| Diamond Koch Pipeline Ii Lp | United States | Private |
| Diamond Offshore Company | United States | Private |
| Diamond Offshore Company, Inc. | United States | Private |
| DIAMOND OFFSHORE DRILLING (UK) LTD. | United Kingdom | Private |
| Diamond Offshore Drilling Services Inc | United States | Private |
| DIAMOND OFFSHORE LTD | United Kingdom | Private |
| Diamond Offshore Netherlands B U | United States | Private |
| Diamond Offshore Netherlands B.V. | Netherlands | Private |
| Diamond Shamrock Offshore | United States | Private |
| Diamond Shamrock, Incorporated | United States | Private |
| Diamond Tree Energy Ltd | Canada | Private |
| Diamondback Energy Services, Inc. | United States | Private |
| DIASHOSEKI CO.,LTD. | Japan | Private |
| DIB GROUP PTY. LIMITED | Australia | Private |
| Dickerson Petroleum Inc | United States | Private |
| DICOMI SRL | Italy | Private |
| Diermeier GmbH & Cie. Mineraloel KG | Germany | Private |
| Dietrich Gass oHG | Germany | Private |
| Dietsmann B.V. | Netherlands | Private |
| Digol Mineralölhandel GmbH | Germany | Private |
| Digol Mineralölhandel KG | Germany | Private |
| Dii Industries, Llc | United States | Private |
| Dil, Inc | United States | Private |
| Dimension Energy Co, Llc | United States | Private |
| DINAGAS SRL | Italy | Private |
| Direct Energy Marketing Limited | Canada | Private |
| Direct Fuels Managment Company, Inc | United States | Private |
| DISA GAS S.A. | Spain | Private |
| DISA PENINSULA SL. | Spain | Private |
| DISA RED DE SERVICIOS PETROLIFEROS S.A. | Spain | Private |
| DISA RETAIL ATLANTICO SL. | Spain | Private |
| DISAGON S.L. | Spain | Private |
| Discovery Petroleum Ltd | Australia | Private |
| Discovery West Corporation | Canada | Private |
| Dislub Combustíveis Ltda. | Brazil | Private |
| Distri-Service | France | Private |
| DISTRIBUCION Y COMERCIALIZACION DE GAS EXTREMADURA SA | Spain | Private |
| DISTRIBUCIONES PETROLIFERAS BERASTEGUI MURUZABAL HERMANOS S. L. | Spain | Private |
| Distribuidora De Petroleo Da Bahia S/A | Brazil | Private |
| Distribuidora de Petroleo Ipiranga | Brazil | Private |
| Distribuidora Equatorial de Produtos de Petróleo Ltda | Brazil | Private |
| DISTRIBUIDORA REGIONAL DEL GAS S.A. | Spain | Private |
| Distrigas Of Massachusetts Llc | United States | Private |
| DISTROBOL DI LOBUONO VITONICOLA & C. S.A.S. | Italy | Private |
| DITTA DI BATTISTA ALBERINDO SRL | Italy | Private |
| Dixie Gas & Oil Corporation | United States | Private |
| Dixie Pipeline Company | United States | Private |
| Dixon Ticonderoga Company | United States | Private |
| DK 6 | France | Private |
| DKCE Debreceni Kombinalt Ciklusu Eromu Korlatolt Felelossegu Tar | Hungary | Private |
| DLB Oil & Gas Inc. | United States | Private |
| Dlg Service A/S | Denmark | Private |
| Dno Yemen AS | Norway | Private |
| DOBI Medical International, Inc. | Canada | Private |
| DOCKS PETROLI SRL | Italy | Private |
| DOF Subsea ASA | Norway | Private |
| DOLNOSLASKA SPOLKA GAZOWNICTWA SP Z O O | Poland | Private |
| Dolphin As | Norway | Private |
| Dolphin Drilling Limited | United Kingdom | Private |
| Dolphin International AS | Norway | Private |
| Domain Energy Corporation | United States | Private |
| Dominion Aviation Services Inc | United States | Private |
| Dominion Exploration & Production, Inc. | United States | Private |
| Dominion Gas Ventures LP | United States | Private |
|
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