Diamond Offshore Drilling, Inc. Diamond Offshore Drilling, Inc. operates as a leading offshore drilling contractor providing contract drilling services to the energy industry worldwide, specializing in deepwater, harsh environment, conventional semisubmersible, and jack-up markets; its fleet includes 15 offshore drilling rigs comprising 11 semi-submersible platforms such as the Ocean GreatWhite and 4 drillships, serving independent oil and gas companies as well as government-owned entities like Hess Corporation, Occidental Petroleum, Petrobras, and BP with operations spanning the United States (accounting for over half of revenues), Australia, Brazil, Mexico, Scotland, Singapore, and Norway. Founded in 1964 as Diamond M Drilling Company and renamed Diamond Offshore Drilling, Inc. in 1993, the company is headquartered in Katy, Texas. In September 2024, Noble Corporation plc completed its $1.6 billion cash-and-stock acquisition of Diamond Offshore Drilling, Inc. , integrating its fleet and $2.1 billion backlog into Noble's operations to create a combined entity with approximately $6.5 billion in backlog, 41 rigs including enhanced deepwater capabilities, and anticipated $100 million in cost synergies, marking a significant strategic consolidation in the offshore drilling sector.