X0306 4 2020-03-01 0 0001451505 Transocean Ltd. RIG 0001750415 Adamson Keelan 1414 ENCLAVE PARKWAY HOUSTON TX 77077 0 1 0 0 Executive Vice President & COO Registered Shares 2020-03-01 4 M 0 8069 0 A 164818 D Registered Shares 2020-03-01 4 M 0 10426 0 A 175244 D Registered Shares 2020-03-01 4 M 0 17281 0 A 192525 D Registered Shares 2020-03-02 4 F 0 15114 0 D 177411 D Restricted Units 0 2020-03-02 4 M 0 10427 0 A 2020-03-01 Registered Shares 10427 10427 D Restricted Units 0 2020-03-02 4 M 0 17281 0 A 2020-03-01 Registered Shares 17281 34562 D Restricted Units, which are 1-for-1 equivalents, acquired on February 10, 2017, pursuant to the Issuer's long-term incentive plan. One third of such restricted units vested on March 1, 2020, 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 8, 2018, pursuant to the Issuer's long-term incentive plan. One third of such restricted units vested on March 1, 2020, resulting in the right of the reporting person to receive the registered shares. The remaining restricted share units vest as follows: 10,427 on March 1, 2021. 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, 2020, resulting in the right of the reporting person to receive the registered shares. The remaining restricted share units vest as follows: 17,281 on March 1, 2021 and 17,281 on March 1, 2022. Shares withheld upon vesting to satisfy tax withholding obligations. The vesting date of the Restricted Units was March 1, 2020, as reported on previously filed Form 4s with respect to the reporting person, which fell on a Sunday this year. The number of registered shares issuable following our sale of registered shares to satisfy tax withholding obligations was not known until March 2, 2020, as reported in this Form 4, and consequently no registered shares were issued until March 2, 2020. /s/ Daniel Ro-Trock by Power of Attorney 2020-03-04