Diamond Offshore Drilling, Inc. is a deepwater drilling contractor which provides drilling services to the oil and gas industry. The company's headquarters are located in Houston, Texas, but they have offices in Metairie, Louisiana, Africa, Australia, Brazil, Indonesia, Scotland, Singapore, Norway and the Netherlands. Diamond Offshore's beginnings can be traced back to the earliest days of the offshore drilling industry. Its predecessor companies were ODECO, Zapata Corporation, and Diamond M Drilling Co. In 1992, Diamond M Corporation purchased all of the outstanding stock of ODECO Drilling... Inc. from ODECO Oil and Gas Co., a subsidiary of Murphy Oil. Shortly thereafter, Diamond M Corp. briefly changed its name to Diamond M-ODECO Drilling Inc. before becoming Diamond Offshore Drilling, Inc. in 1993. Diamond Offshore began trading on the New York Stock Exchange in October 1995 and acquired Arethusa Ltd. in April 1996. As of 2009, Diamond Offshore Drilling operates around 47 drilling rigs in all areas of the world. In the early 1960s the onshore drilling company Brewster-Bartle went bankrupt.
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| NYSE symbol: | DO |
| Headquarters: | Houston, Texas |
| Legal structure: | Public company |
| Annual revenue: | $3,544,060,000 |
| Net income: | $1,311,020,000 |
| Operating income: | $1,910,760,000 |
| Market cap: | $20,000,000,000 |
| Industries: | Drilling Oil and Gas Wells |