Transocean Ltd.

Item 7.01 Regulation FD Disclosure. ​ Transocean Ltd. announced contract awards for two of its ultra-deepwater drillships in the U.S. Gulf. In aggregate, the fixtures represent approximately $550 million in firm contract backlog. ​ The Deepwater Proteus was awarded a ten-well contract with an undisclosed operator in the U.S. Gulf. The estimated 700-day campaign is expected to contribute approximately $325 million in backlog and commence in the first quarter of 2027 in direct continuation of the rig's current U.S. Gulf contract. ​ The Deepwater Conqueror was awarded a five-well contract with an undisclosed operator in the U.S. Gulf. The estimated 450 days of work is expected to contribute approximately $225 million in backlog, excluding mobilization fees, and commence in the third quarter of 2027 in direct continuation of the rig's program in Equatorial Guinea. ​ A copy of the press release announcing the fixture referred to above is attached hereto and incorporated herein by reference as Exhibit 99.1 . ​ Item 9.01 Financial Statements and Exhibits. ​ (d) Exhibits. ​ ​

Exhibit No . ​ ​ ​ Description ​ ​ ​ 99.1 ​ Transocean Ltd. Announces Contract Awards Totaling $550 Million 101 ​ Interactive data files pursuant to Rule 405 of Regulation S-T formatted in Inline Extensible Business Reporting Language 104 ​ Cover Page Interactive Data File (formatted as inline XBRL).