Transocean Offshore Corporate Office, Texas

Transocean Offshore is one of the world's largest offshore drilling contractors, with over 18,000 employees working around the globe.  As of 2014, Transocean operates a fleet of 79 mobile offshore drilling units, comprised of 48 high-specification floaters (ultra-deepwater, deepwater and harsh-environment drilling rigs), 21 midwater floaters, and 10 high-specification  jackups, many of which can drill in water depth over 10,000 feet. In 2013, a Transocean ultra-deepwater drillship off the East Coast of India, set the world water-depth record at 10,411 feet (3,174).  Also in 2013, Transocean agreed to pay the U.S. government $1 billion in civil penalties and $400 million in criminal penalties - the second-largest enviromental fine in U.S. history - for its role in the 2010 Deepwater Horizon explosion and oil spill, having supplied both the drilling rig and crew to BP Exploration and Production Inc. Like a number of other American companies that operate globally, Transocean, though based in Houston, is incorporated outside the country (in this case Zug, Switzerland), as the U.S. federal government taxes corporate income, no matter where it was generated, as if it were earned domestically. Currently the company's headquarters are located in Vernier, Switzerland, near Geneva.