X0609 4 2026-05-22 0001451505 Transocean Ltd. RIG 0001239236 DEATON CHAD C true TURMSTRASSE 30 STEINHAUSEN V8 6312 SWITZERLAND true false false false 0 Registered Shares 2026-05-22 4 M 0 82353 6.81 A 223353 D Registered Shares 2026-05-26 4 F 0 20932 6.70 D 202421 D Restricted Units 0 2026-05-22 4 A 0 30435 0 A Registered Shares 30435 30435 D Restricted Units, which are 1-for-1 share equivalents, acquired on May 30, 2025, pursuant to the Issuer's long-term incentive plan. The restricted share units vested on May 22, 2026, and the reporting person elected not to defer the receipt of the registered shares. Shares sold upon vesting to satisfy tax withholding obligations. Restricted Units, which are 1-for-1 registered share equivalents, were acquired on May 22, 2026, pursuant to the Issuer's long-term incentive plan. Restricted Units vest on the earlier of: (i) May 22, 2027, or (ii) the date of the next Annual General Meeting of the Company's shareholders following the May 22, 2026 grant date. Such Restricted Units will be payable in registered shares of the Issuer following the applicable vesting date, pursuant to the terms and conditions of the award. /s/ Debra Kupferman by Power of Attorney 2026-05-27