NYSE: RIG 3.115 0.055 1.8% 10:58 A.M. ET Transocean MENU SHAREHOLDER INFORMATION Transfer Agent and Registrar Computershare www.computershare.com/investor Shareholder inquiries should be sent to: Computershare P.O. Box 505000 Louisville, Kentucky 40233-5000 1 877 397 7229 1 201 680 6570 (for callers outside the United States) Overnight correspondence should be mailed to: Computershare 462 South 4th Street Suite 1600 Louisville, Kentucky 40233-5000 Online inquiries: https://www-us.computershare.com/investor/contact BACK TO TOP Transocean ABOUT CONTACT ©2021 TRANSOCEAN LTD. LEGAL/PRIVACY NOTICE

NYSE: RIG 3.115 0.055 1.8% 10:58 A.M. ET Transocean MENU SHARE REPURCHASES Transocean Ltd. Share Repurchase Program On May 15, 2009, the shareholders of Transocean Ltd. ("Transocean") approved a share repurchase program and authorized Transocean's board of directors ("Board") to repurchase Transocean registered shares with a par value of CHF 15 each ("Shares") for cancellation purposes at an aggregate repurchase price up to CHF 3.5 billion ("Share Repurchase Program"). On February 12, 2010, the Board authorized management to implement share repurchases under the Share Repurchase Program ("Share Repurchases"). Share Repurchases may be carried out in the U.S. market or in the Swiss market on a second trading line of the SIX Swiss Exchange ("SIX Second Trading Line"). On the SIX Second Trading Line, Shares trade under Swiss security number 11 117 190, ISIN CH 001 117190 3 and ticker symbol "RIGNE". Transocean reserves the right to suspend or discontinue Share Repurchases at any time. Transocean is under no obligation to repurchase Shares under the Share Repurchase Program. Under applicable Swiss Takeover Regulations, Transocean is required to make public, among other things, information regarding the number of shares repurchased under the Share Repurchase Program. To access information regarding Share Repurchases under the Share Repurchase Program between February 12, 2010 and August 29, 2013, please click here. Share Repurchases effected after August 29, 2013 are subject to new Swiss Takeover Board regulations reporting requirements. To access information regarding Share Repurchases under the Share Repurchase Program since August 29, 2013, click here. Under applicable Swiss Takeover Board regulations, share repurchase programs are generally subject to the approval by the Swiss Takeover Board. In relation to the Share Repurchase Program, the Swiss Takeover Board has renewed the required regulatory approval on May 24, 2013. To access the regulatory announcement made by Transocean in connection with the Swiss Takeover Board's renewal approval, click below. English German French BACK TO TOP Transocean ABOUT CONTACT ©2021 TRANSOCEAN LTD. LEGAL/PRIVACY NOTICE