Who owned and operated the Deepwater Horizon drilling rig?

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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 drilling rig was owned and operated by the offshore oil-drilling company Transocean. At the time of the 2010 disaster, the rig was being leased by the oil company BP.12