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 Transocean is the world’s largest offshore drilling contractor. Based in
Switzerland, Transocean owns more than 140 drilling rigs and operates
in the major offshore oil and gas fields in the world. Transocean has
grown substantially through a series of corporate acquisitions,
including the acquisition of Reading & Bates Falcon (R&B Falcon) in
2000 and Global Santa Fe in 2007. Transocean owned the Deepwater
Horizon rig, which was under a long‐term lease to BP at the time of the
Macondo blowout. The lease agreement required Transocean to
manage and operate the Deepwater Horizon on behalf of BP.

Offshore drilling operations are complex and normally involve the work
of many different specialists. In addition to BP, the leaseholder and the
designated operator of the Macondo well, and Transocean, the following
companies also had significant roles in the operation:

 Halliburton, which provides products and services to the energy
industry worldwide and is one of the world’s largest cementing
contractors to the oil and gas industry, provided cement planning,
products, and services at Macondo.

 Anadarko E&P Company LP, Anadarko Petroleum Corporation and
MOEX were BP’s partners in the Macondo well. Anadarko E&P
Company LP owned 22.5%, and Anadarko Petroleum Corporation
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owned 2.5%. Both Anadarko companies are U.S. oil and gas
exploration companies. MOEX Offshore 2007, a Japanese oil
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exploration firm, owned a 10% share of the well. The companies
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shared in BP’s costs to drill the Macondo well and would have shared
in any profits from the well.

 Cameron, which is a Texas‐based manufacturer of oil and gas pressure
control equipment, manufactured the Deepwater Horizon’s BOP stack.

 MI‐SWACO, which provides drilling supplies and services
worldwide, developed the mud program and provided drilling mud
and personnel to operate the Deepwater Horizon rig’s mud system.

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BP-HZN-MBI-00192559.
18 BP‐HZN‐MBI‐00177777.
19 Id.

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