Company: RIG
Filing Date: 2025-09-24
Form Type: 424B5
Source: 0001451505-25-000097
Chunk: 53

Company: Transocean Ltd.
Filing Date: 2025-09-24
Form: 424B5
Chunk 53
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 offered or sold in Japan or to, or for the benefit of, any resident of Japan (which term as used herein means any person resident in Japan, including any corporation or other entity organized under the laws of Japan) or to others for re-offering or re-sale, directly or indirectly, in Japan or to, or for the benefit of, any resident of Japan except pursuant to an exemption from the registration requirements, and otherwise in compliance with, the FIEL and the other applicable laws and regulations of Japan.

S-32

#### Switzerland
This prospectus supplement and the accompanying base prospectus, which are part of a registration statement on Form S-3 (File No. 333-280617) that we filed with the SEC, constitute a foreign prospectus within the meaning of article 54 para. 2 and para. 3 of the Swiss Federal Financial Services Act of June 15, 2018, as amended (“FinSA”), and article 70 paras. 2 to 4 of the Swiss Federal Financial Services Ordinance of November 6, 2019, as amended, and have been deposited with the Prospectus Office of SIX Exchange Regulation AG. You may obtain copies of the full registration statement, of which the prospectus supplement and the accompanying base prospectus are part, in electronic form at the internet website maintained by the SEC at www.sec.gov or in electronic or printed form from us by writing or calling:

Transocean Ltd.

c/o Transocean Offshore Deepwater Drilling Inc.

1414 Enclave Parkway

Houston, Texas 77077

Attn: Investor Relations
+1 (713) 232-7500

#### United Arab Emirates
**The shares have not been, and are not being, publicly offered, sold, promoted or advertised in the United Arab Emirates (including the Dubai International Financial Centre) other than in compliance with the laws of the United Arab Emirates (and the Dubai International Financial Centre) governing the issue, offering and sale of securities. Further, this prospectus does not constitute a public offer of securities in the United Arab Emirates (including the Dubai International Financial Centre) and is not intended to be a public offer. This prospectus has not been approved by or filed with the Central Bank of the United Arab Emirates, the Securities and Commodities Authority or the Dubai Financial Services Authority.**

#### Australia
No placement document, prospectus, product disclosure statement or other disclosure document has been lodged with the Australian Securities and Investments Commission, in relation to the offering.