X0508 4 2025-11-26 0001451505 Transocean Ltd. RIG 0002022236 Vayda Robert Thaddeus 1414 ENCLAVE PARKWAY HOUSTON TX 77077 false true false false EVP, Chief Financial Officer 0 Registered Shares 2025-11-26 4 S 0 30000 4.29 D 235154 D Registered Shares 91 I By Child The reporting person disclaims beneficial ownership of these securities, and this report shall not be deemed an admission that the reporting person is the beneficial owner of the securities for purposes of Section 16 or for any other purpose. /s/ Debra Kupferman by Power of Attorney 2025-12-01