Which company leased the Deepwater Horizon rig and the Macondo well?

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Fireboats battle a blaze on the Deepwater Horizon drilling rig in the Gulf of Mexico, April 2010. — Deepwater Horizon oil spill Fireboat response crews attempt to extinguish the blaze aboard the Deepwater Horizon oil rig in the Gulf of Mexico, April 21, 2010.

The Deepwater Horizon rig was owned and operated by the offshore-oil-drilling company Transocean and was leased by the oil company BP. BP also held the lease for the Macondo oil prospect, where the well was located.1