Major Deepwater Drilling Contractors in the Gulf of Mexico

The Gulf of Mexico (GoM) is the world's most active deepwater (>450 m / 1,500 ft) drilling province. The following contractors operate the majority of floating rigs there:

Top 5 Deepwater Drilling Companies (GoM Fleet)

1. Transocean Ltd (NYSE: RIG)

• GoM Fleet: 15+ floaters (drillships, semisubmersibles)
• Flagship: Deepwater Asgard, Deepwater Atlas, Deepwater Titan (ultra-deepwater, 12,000 ft+)
• Clients: Shell, BP, Chevron, Equinor, Beacon
• Note: Owner of Deepwater Horizon (Macondo, 2010); since transformed safety culture.

2. Valaris plc (NYSE: VAL)

• GoM Fleet: 10+ floaters + jackups
• Key rigs: VALARIS DS-10, DS-11, DS-12 (drillships); VALARIS 8500, 8501 (semis)
• Focus: High-spec, harsh-environment capable; emerged from 2020 restructuring.

3. Noble Corporation (NYSE: NE)

• GoM Fleet: 6+ semisubmersibles
• Key rigs: Noble Globetrotter I & II, Noble Sam Croft, Noble Bob Douglas
• Specialty: Ultra-deepwater, high-pressure/high-temperature (HPHT) wells.
• Recent: Merged with Maersk Drilling (2022); combined fleet ~20 floaters globally.

4. Diamond Offshore Drilling (NYSE: DO)

• GoM Fleet: 4–5 drillships/semis
• Key rigs: Ocean BlackHawk, Ocean BlackRhino, Ocean Courage
• Focus: Mid-to-deepwater; competitive dayrates; exited Chapter 11 (2021).

5. Seadrill Limited (NYSE: SDRL)

• GoM Fleet: 3–4 drillships/semis
• Key rigs: West Capella, West Tellus, West Neptune
• Specialty: Harsh-environment, dual-activity drillships.
• Recent: Restructured 2022; new equity, streamlined fleet.

Other Notable Players

• Saipem (Italian): Saipem 12000 (drillship) – occasional GoM work.
• Maersk Drilling: Now part of Noble (see above).
• Shelf Drilling: Jackup specialist; limited deepwater.
• Operator-owned: Shell, Chevron, BP sometimes use own rigs (rare).

Market Context

• Dayrates (2024): $250K–$450K/day for 7G/8G drillships.
• Utilization: ~85% for high-spec floaters.
• Trends: Lower-carbon drilling (electrification, carbon capture), automation, decommissioning work rising.

These contractors drill for operators (Shell, BP, Chevron, Exxon, Equinor, BHP, Murphy, etc.) who hold the leases. The contractor–operator model dominates GoM deepwater.