Transocean Inc To replace Dell in S&P 500 - Transocean Ltd. (NYSE:RIG) will replace Dell Inc. (NASD:DELL) in the S&P 500 after the close of trading on Monday, October 28. Founder Michael Dell and Silver Lake Partners are acquiring Dell in a deal expected to be completed soon pending final conditions. - Transocean provides offshore contract drilling services for oil and gas wells. Headquartered in Zug, Switzerland, the company will be added to the S&P 500 GICS (Global Industry Classification Standard) Oil & Gas Drilling Sub-Industry index.