- Aspect Resources LLC
- Aspect Resources LLC
- Aspen Energy Inc
- Aspen Exploration Corp
- Aspen Exploration Corp
- Aspen Group Resources Corp
- Aspen Integrated
- Aspen Integrated Oil & Gas
- Aspen Operating Co
- Aspire Energy LLC
- Associates Consulting Cnstrctn
- Atasca Resources Inc
- Athena Energy
- Athena Energy Inc
- Athena Energy Inc
- Atkinson Energy Corp
- Atlantia Offshore LTD
- Atlantic Pacific Marine
- Atlas America Inc
- Atlas America Inc
- Atlas America Inc
- Atlas America Inc
- Atmic Inc
- Atmos Energy Corp
- Atocha Oil & Gas
- Atoka Geochemical Svc Corp
- Atoka Geochemical Svc Corp
- ATP Oil & Gas Corp
- ATP Oil & Gas Corp
- Atwood Oceanics Inc
- Aubris
- Aurora Exploration
- Ausable Energy LLC
- Austin Energy Inc
- Austin Resources
- Austin Resources
- Austin Resources
- Austin Resources
- Australian Canadian Oil
- Automation X
- Avalon Energy Corp
- Avalon Energy LLC
- Avalon Energy LLC
- Avalon Exploration
- Avalon Petroleum Co
- Averex Inc
- Aviva America Inc
- Axis Exploration LLC
- Ayco Energy
- Aztec Energy Corp
- Aztec Energy Corp
- Aztec Oil & Gas
- Aztec Producing Co
- B & J Resources
- B & J Resources
- B & R Energy
- B & S Exploration Inc
- B & W Exploration
- B K Exploration Co
- B P America Production Co
- B P Production Gsf
- Babcock & Brown Energy
- Babcock & Brown Energy
- Badger Oil & Gas Inc
- Badger Resources Inc
- Bagby & Co
- Bagwell Co
- Bahia Exploration Co
- Bahlburg Exploration
- Baker Exploration Co
- Baker Oil Tools
- Bakerwell Inc
- Bald Eagle Oil & Gas
- Bald Eagle Oil & Gas
- Ball Exploration Inc
- Ballantyne Oil
- Ballard Exploration
- Ballard Exploration
- Ballard Exploration
- Ballard Exploration Co
- Ballard Petroleum Holding
- Bancequity Petroleum Corp
- Bandera Petroleum Inc
- Banner Energy Inc
- Bar-Mac Investments Inc
- Barbara Malek
- Barbee & Co
- Barbee Exploration Inc
- Barbrick Investment Co
- Barbrick Investment Co
- Barby Energy Corp
- Barker Energy Corp
- Barnett Energy Corp
- Barnwell Industries Inc
- Baron & Energy
- Baron Petroleum
- Barrett Brothers Oil & Gas
- Barrett Brothers Oil & Gas
- Barrett Oil & Gas Inc
- Barrier Resources
- Barrow Energy Corp
- Barrow Shaver Resources Co
- Barsu Resources Inc
- Bartell Exploration
- Bartling Oil Co
- Bartling Oil Co
- Barton Springs Investment Corp
- Basa Resource Inc
- Basa Resources Inc
- Basa Resources Inc
- Baseline Capital LTD
- Basin Energy Development
- Basin Exploration Inc
- Basin Oil & Gas Corp
- Bass Energy Co
- Bat Energy Co
- Bateman's Bay Exploration Inc
- Bay Geophysical Assoc Inc
- Bay Petroleum Corp
- Bayou Resources
- BDS Intl
- Beach Energy Group
- Beach Oil & Gas Inc
- Beach Oil & Gas Inc
- Beacon Exploration
- Beacon Petroleum Management
- Bean Resources Inc
- BEAR Exploration Co
- Bear Paw Energy Inc
- Bear Paw Energy Inc
- Bearcat Inc
- Bearcat Inc
- Beartooth Oil & Gas Co
- Beartooth Oil & Gas Co
- Beck Energy Corp
- Becker Oil Co
- Beecherl Co
- Belco Energy
- Belco Energy Corp
- Belden & Blake
- Belden & Blake Corp
- Bell & Kinley Co
- Bellwether Exploration
- Bellwood Petroleum Corp
- Belport Oil
- Belvoir Oil & Gas
- Ben J Taylor Inc
- Ben M Patterson Jr
- Ben M Patterson Jr
- Ben R Lay
- Benchmark Exploration
- Benedum Interests
- Benjamin Smeltzer Co
- Bennett Engine & Compressor
- Benson & Schoen Oil Co
- Benson & Schoen Oil Co
- Benson Mineral Group
- Benson Mineral Group
- Ber-Ex-Co Inc
- BERCO Resources LLC
- BERCO Resources LLC
- Berenergy Corp
- Berenergy Corp
- Berexco Inc
- BEREXCO Inc
- Bergstein Oil & Gas
- Bernard A Holman Oil Prprts
- Berry Energy Consultants Inc
- Berry Energy Inc
- Berry Petroleum Co
- Berry Petroleum Co
- Berry Petroleum Co
- Berry Resources Inc
- Bertolet & Cox
- Best Exploration Inc
- Best Resources
- Best Resources
- Bet-Ro Inc
- Betop Inc
- Bettis & Snyder LLC
- Bettis Brothers Inc
- Bettis Group Inc
- Bex Inc
- Bexco
- BGH Gas Test Operating Inc
- BHP Billiton Petroleum Amer
- BHS Inc
- Bickerstaff Associates Inc
- Bickerstaff Associates Inc
- Big Joe Oil Co
- Big M Exploration Inc
- Big Sky Energy
- Big Snowy Resource LP
- Bill & Jesse Inc
- Bill Barrett Corp
- Bill Barrett Corp
- Bill Barrett Corp
- Bill D Farleigh Oil Properties
- Bill H Pearl Productions Inc
- Bill Rudd Inc
- Bill Williams Oil Co
- Billy R Powell Petroleum
- Bisett Group
- Bisett Group
- Bisett Group
- Bishop Petroleum Inc
- Bison Energy Corp
- Bison Energy Partners Inc
- Bison Oil & Gas
- Bison Oil & Gas Gp LLC
- Bitter Creek Pipelines
- Bivins Energy Corp
- Black & Gold Resources
- Black Coral LTD
- Black Coral LTD
- Black Gold Oil & Gas Inc
- Black Hills Energy Resources
- Black Hills Exploration & Prod
- Black Oil Co Inc
- Black Pearl Energy
- Black Rock Oil & Gas
- Black Rock Oil & Gas
- Blackbrush Energy Inc
- Blackbrush Energy Inc
- Blackgold Trading LLC
- Blackhawk Investments LLC
- Blacklake Energy
- Blackstone & Assoc
- Blackstone Energy
- Blackstone Minerals Co
- Blackwell Energy Group
- Blade Energy Partners
- Blade Energy Partners
- Blade Energy Partners
- Blain Exploration LTD
- Blaine Exploration LTD
- Blair Exploration Inc
- Blakenergy
- Blanco Oil Co
- Blanco Oil Co
- Blanks Energy
- Blauser Energy Corp
- Blessing Petroleum Group
- Bloch Petroleum LLC
- Bluco Production Co Inc
- Blue Creek Gas Co
- Blue Dolphin Energy Co
- Blue Dolphin Pipeline Co
- Blue Dolphin Productions
- Blue Flame Energy Corp
- Blue Gold Production
- Blue Star Gas Corp
- Bluebonnet Oil Corp
- Blueridge Petroleum Corp
- Bluffstone Associates
- Bluffstone Associates
- BMJ Pipeline Inc
- BNP Petroleum
- Bob Baker
- Bob Bertolet
- Bob Callan
- Bob Carroll Inc
- Bob Pearson Oil & Gas Explrtn
- Boerne Land & Cattle Co Inc
- Boerne Land & Cattle Co Inc
- Bogo Energy Corp
- Bohard Drilling
- Bois D'Arc Energy INC
- Bois D'Arc Resources
- Bois D'Arc Resources
- Bommer Engineering Co
- Bommer Engineering Co
- Bon Wier Producing Co
- Bonray Inc
- Boo-Ker Oil & Gas Corp
- Boone Exploration Inc
- Borean Oil Co
- Borero Enterprises
- BOS Corp
- Bounty Production Co
- Bounty Production Co
- Bowerman Exploration Inc
- Bowerman Oil & Gas Inc
- Bowers Oil & Gas Inc
- Bowman & Cains Exploration
- Box Exploration
- BP America
- BP America
- Bp America Prod Co
- BP America Production Co
- BP America Production Co
- BP America Production Co
- BP Exploration & Oil
- BP Exploration Inc
- BP Exploration Inc
- BPI Industries Inc
- BPZ Energy Inc
- Bracken Operating Co LLC
- Bradco Oil Co
- Braden Co
