- Hale Oil Co
- Haley Oil Co
- Haliburton Oil
- Hall Engineering Inc
- Hall Production Co
- Halliburton Co
- Hallman Oil Co Bill Clark Oil
- Halron Oil Co
- Halvey Energy Co
- Halyard Corp
- Hamilton Operating Inc
- Hamilton-Wilber Oil Co Inc
- HAN Operating Inc
- Hancock Oil Co
- Handford Oil
- Hane Operating
- Hanesco Oil & Gas
- Hankins & Johnson Oil Co
- Hanover Compressor Co
- Hansen Bulk Plant
- Hansen Bulk Plant
- Hanson Oil Co
- Hanson Operating Co Inc
- Hanson Production Co
- Haq Oil Sales Inc
- Harco Operating Co
- Hardiman Oil Co
- Hardin Oil Co Inc
- Harding S Frankel
- Harding S Frankel
- Hardy Oil & Gas
- Hardy Oil Co
- Hardy Oil Inc
- Harken Exploration
- Harmel Oil Inc
- Harmel Oil Inc
- Harms Oil Shop
- Harper Oil Co
- Harrell Oil Co
- Harris & Walton Oil Oprtrs
- Harris Oil Co
- Harry H Diamond Inc
- Hartland 36 CPF
- Hartland 36 CPF
- Hartland LLC
- Hartman Oil Co Inc
- Hartman Oil Co Inc
- Hartshorne & Assoc Engrg Inc
- Harvard Investments Inc
- Harvard Petroleum Co
- Harvest Pipeline
- Harvey Oil
- Harvey Oil & Gas
- Hassie Hunt Exploration Co
- Hassie Hunt Exploration Co
- Hassie Hunt Exploration Co
- HAT Oil & Gas Inc
- HAT Oil & Gas Inc
- Havana Express Oil Exprtrs
- Haven Oil Co
- Havoco Oil Co
- Hawk Management Group Inc
- Hawkins Oil & Gas
- Hawks Co
- Hawley Oil Co
- Hawley Oil Co
- Hawley Oil Co
- Hay Hot Oil
- Hayes Oil Co Serv Sta
- Haynes EM Jr Inc Oil Distr
- HCM
- Hdl Oil Properties Inc
- Headline Resources Inc
- Heartland Exploration Inc
- Heartland Oil & Gas Corp
- Heartland Resources Inc
- Heartland Resources Inc
- Heartland Resources Inc
- Heath Oil Co
- Heatwell Oil Inc
- Heavy Fuels Inc
- Heavy Fuels Inc
- Heck Exploration Co
- Heddington Oil Co
- Heeder Oil Co Inc
- Heeder Oil Co Inc
- Heflin Exploration Inc
- Heitman Oil Field Supl & Rntl
- Helicorp Inc
- Helis Oil & Gas Co LLC
- Hellman Properties
- Hellman Properties
- Helmer Oil
- Helmerich & Payne Inc
- Hendrickson Oil Co
- Henigman Oil Co Inc
- Henigman Oil Co Inc
- Henndon Oil
- Henoch Oil Co
- Henry Petroleum
- Henry Petroleum
- Henry Production Co
- Henson Oil Co
- Hep Oil Co
- Hep Oil Inc
- Herbert Gussman Oil
- Herbert Minerals LTD
- Herbert T Moller
- Hercules Offshore Corp
- Hercules Offshore Corp
- Heritage Energy Co
- Heritage Petroleum Inc
- Heritage Resources Inc
- Herley-Kelley Co
- Herlihy Oil & Gas
- Herndon Oil
- Herndon Oil
- Herndon Oil
- Herndon Oil
- Herndon Oil
- Herndon Oil
- Herndon Oil
- Herndon Oil
- Herndon Oil
- Herndon Oil
- Herndon Oil Porter Square
- Hertiage Petroleum
- Hess Oil Co
- Hexad Oil Co
- HGB Oil Corp
- Hickam Oil & Gas Inc
- Hickam Oil & Gas Inc
- Hicks Oil & Butane Co
- Higganum Oil Svc
- Highland Oil Co
- Highlands Oil Co
- Highway Oil
- Highway Oil
- Hiland Partners LP
- Hilcorp Energy
- Hilcorp Energy Co
- Hilcorp Energy Co
- Hilcorp Energy Co
- Hilcorp Energy Co
- Hilcorp Energy Co
- Hilcorp Energy Co
- Hilcorp Energy Co Louisiana
- Hilcorp Energy Corp
- Hill Corp Energy
- Hill Oil
- Hill Producing
- Hill Production Co
- Hill Production Co
- Hill Resources Inc
- Hill Trusts
- Hill Trusts
- Hillcorp Energy Co
- Hillcrest Beverly Oil Corp
- Hillcrest Beverly Oil Inc
- Hills Exploration Corp
- Hilltop Oil & Gas
- Hinkle Oil & Gas Co
- Hinkle Oil Co
- Hinsdale Oil
- Hinton Productions Co
- Hiwassee Construction Co
- Hocking Oil Co
- Hockley Oil Ranch
- Hockley Oil Ranch
- Hockley Oil Ranch
- Hockley Oil Ranch
- Holcomb Oil & Gas Inc
- Holland Oil Co
- Hollingsworth Oil Co Inc
- Holly Refining & Marketing Co
- Holmes Oil Co
- Holmes Oil Co
- Holmes Oil Co
- Holmes Oil Distributing
- Holt Oil Co DBS Reilly Rd
- Holtzman Express
- Holtzman Oil Corp
- Homax Oil Sales
- Hometown Oil LLC
- Honeck Oil Co
- Hoover Oil & Gas Inc
- Hopco Resources Inc
- Hopco Resources Inc
- Hope Well Operating Inc
- Hopewell Operating Inc
- Horizon Oil Corp
- Horkey Oil Co
- Horkey Oil Co
- Horn J T Oil Co Inc
- Horners Oil & Gas Prod
- Hornet Oil Co
- Hornet Oil Co
- Hornsby Oil
- Houghton Oil Co
- Housewarmers Diamond Grier Oil
- Houston Hill Estate
- Houston J Doswell
- Houston Oil & Gas Co
- Houston Oil Producing Ent
- Houston Oil Producing Ents
- Houston Oil Producing Ents
- Hoven Oil Co Inc
- Howard Alexander Oil Producer
- Howard E Stover
- Howard E Stover
- Howard Engineering Inc
- Howard Stover
- Howard Stover
- Howco Oil & Gas
- Howell Oil & Gas
- Howell Petroleum Corp
- Howell Petroleum Corp
- Hoyt Energy
- HRB Operation Co
- Hubbard Oil Corp
- Huels Oil Co
- Huels Oil Co
- Huels Oil Co
- Huffman Oil Co
- Huffman Oil Co
- Hughes Eastern Corp
- Hughes Energy Inc
- Huhtala Oil Co
- Hukill Oil
- Hull Oil Co
- Hullinger Oil
- Humble Common Storage
- Humble Common Storage
- Humble Oil & Refining Co
- Humble Oil & Refining Co
- Hummon Corp
- Hummon Corp
- Humphrey Co
- Hunt Crude Oil Supply
- Hunt Crude Oil Supply Co
- Hunt Graham
- Hunt Hassie Exploration Co
- Hunt Oil
- Hunt Oil
- Hunt Oil
- Hunt Oil
- Hunt Oil Co
- Hunt Oil Co
- Hunt Oil Co
- Hunt Oil Co
- Hunt Oil Co
- Hunt Oil Co
- Hunt Oil Co
- Hunt Oil Co
- Hunt Oil Co
- Hunt Oil Co
- Hunt Oil Co
- Hunt Oil Co
- Hunt Oil Co
- Hunt Oil Co
- Hunt Petroleum
- Hunt Petroleum
- Hunt Petroleum Corp
- Hunt Petroleum Corp
- Hunt Petroleum Corp
- Hunt Petroleum Corp
- Hunt Petroleum Corp
- Hunt Refining Co
- Hunter Brothers
- Hunter Brothers
- Hunter Gas Gathering Inc
- Hunter Oil
- Hunter Resources
- Hupfer Oil & Gas
- Hurst Harvey Oil Co Inc
- Hurst Oil Investments Inc
- Huseby Michael C Oil & Gas
- Husker Ag LLC
- Hutchison Oil & Gas
- Hux Oil
- Hy-Test Oil Co Inc
- Hyde Oil & Gas Corp
- Hyperion
- Hyperion Energy LP
- Hyperion Energy LP
- Hyperion Energy LP
- Hyperion Energy LP
- I H Perlman Oil & Gas
- I H Perlman Oil & Gas Props
- I H Perlman Oil & Gas Props
- Icenhower Oil
- Imperial Central State Oil Co
- Imperial Oil Of North Dakota
- Imperial Petroleum Inc
- Incenses & Oil Shop
- Incline Energy Inc
- Incline Reserves Inc
- Independent Oil Producers
- Index Oil & Gas USA
- Index Oil & Gas USA
