Transocean Ltd.

Item 7.01 Regulation FD Disclosure. ​ Transocean Ltd. (NYSE: RIG) ("Transocean") today announced that the Deepwater Conqueror was awarded a two-well contract for work in Equatorial Guinea with an undisclosed operator. The estimated 170-day campaign is expected to commence in 2027 in direct continuation of the rig's current contract in the U.S Gulf and contribute approximately $80 million in backlog, excluding additional services and compensation for mobilization and demobilization. ​ 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 $80 Million Contract For Ultra-Deepwater Drillship 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).