X0306 4 2021-03-01 0 0001451505 Transocean Ltd. RIG 0001228413 DAVIS HOWARD E 1414 ENCLAVE PARKWAY HOUSTON TX 77077 0 1 0 0 EVP, CAO & CIO Registered Shares 2021-03-01 4 M 0 16729 0 A 276632 D Registered Shares 2021-03-01 4 M 0 20641 0 A 297273 D Registered Shares 2021-03-02 4 F 0 9472 3.68 D 287801 D Restricted Units 0 2021-03-01 4 M 0 20642 0 A Registered Shares 20642 20642 D Restricted Units, which are 1-for-1 share equivalents, acquired on February 8, 2018, pursuant to the Issuer's long-term incentive plan. One third of such restricted units vested on March 1, 2021, resulting in the right of the reporting person to receive the registered shares. Restricted Units, which are 1-for-1 share equivalents, acquired on February 7, 2019, pursuant to the Issuer's long-term incentive plan. One third of such restricted units vested on March 1, 2021, resulting in the right of the reporting person to receive the registered shares. The remaining restricted share units vest as follows: 20,642 on March 1, 2022. Shares sold upon vesting to satisfy tax withholding obligations. /s/ Daniel Ro-Trock By Power of Attorney 2021-03-03