Transocean Ltd.

Item 7.01 Regulation FD Disclosure. ​ Transocean Ltd. (NYSE: RIG) ("Transocean") today announced contract fixtures for two of its harsh environment semisubmersibles in Norway. In aggregate, the fixtures represent approximately $184 million in firm contract backlog. ​ The Transocean Encourage was awarded a seven-well contract extension. The estimated 365 days of work is expected to commence in the first quarter of 2027 in direct continuation of the rig's current program and contribute approximately $152 million in backlog, excluding additional services. ​ Two one-well options have been exercised for the Transocean Enabler in direct continuation of the rig's current activity. The incremental 70 days of work is expected to contribute approximately $32 million in backlog, excluding additional services, and commits the rig through December 2027. ​ A copy of the press release announcing the fixtures 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 Award and Extension Totaling $184 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).