Transocean Ltd.

Item 7.01 Regulation FD Disclosure. ​ Transocean Ltd. (NYSE: RIG) ("Transocean") today announced that the Deepwater Asgard was awarded a five-well contract in the Eastern Mediterranean Sea with an undisclosed operator. The estimated 390-day campaign is expected to commence in the fourth quarter of 2026 and contribute approximately $158 million in backlog, excluding additional services and compensation for mobilization and demobilization. ​ Inclusive of the recently announced fixtures on the Transocean Barents in Norway, and the Deepwater Orion , Deepwater Aquila , and Deepwater Corcovado in Brazil, total backlog additions approximate $1.6 billion since the beginning of April. ​ 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 $158 Million Award 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).