Diamond Offshore Drilling, Inc. is an offshore drilling contractor. The company is headquartered in Katy, Texas, United States, and has major offices in Australia, Brazil, Mexico, Scotland, Singapore, and Norway. The company operates 15 drilling rigs including 11 semi-submersible platforms and 4 drillships. In 2019, the company's revenues were primarily from Hess Corporation (28.9%), Occidental Petroleum (20.6%), Petrobras (19.5%), and BP (3.1%). Operations in the United States accounted for 52.5% of the company's revenues in 2019.