EXHIBIT 99.1 TRANSOCEAN LTD. REPORTS FIRST QUARTER 2025 RESULTS | | | Three months ended | | | Three months ended | | | --- | --- | --- | --- | --- | --- | --- | | | March 31, | | December 31, | sequential | March 31, | year-over-year | | | 2025 | | 2024 | change | 2024 | change | | (In millions, except per share amounts, percentages and backlog) | | | | | | | | Contract drilling revenues | $906 |$ | 952 | $(46)$ | 763 | $ 143 | | Revenue efficiency (1) | 95.5 % | | 93.5 % | | 92.9 % | | | Operating and ...