Industry Classification Benchmark 0001 Oil & Gas and underlying categories have a large number of companies active in it.
The overview creates segments of companies which are comparable and benchmarks their individual performance.
Transocean (NYSE:RIG) work in progress
Noble Corporation (NYSE:NE) work in progress
Seadrill (NYSE:SDRL) Feb 19, 2014 Seadrill's Path To Problems
Ensco (NYSE:ESV) work in progress
Diamond Offshore (NYSE:DO) work in progress
Oil And Gas Services
Although the comparison tries to include all major or niche companies, this is not a complete overview. If a niche player or important company is overlooked, mention it in the comments.