Company: RIG
Filing Date: 2025-09-26
Form Type: 424B5
Source: 0001451505-25-000102
Chunk: 57

Company: Transocean Ltd.
Filing Date: 2025-09-26
Form: 424B5
Chunk 57
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 additional information about us through which you can also access our SEC filings. Except for the documents incorporated by reference into this prospectus supplement as described under the heading “Incorporation by Reference,” the information and other content contained on our website are not incorporated by reference, do not constitute part of this prospectus supplement and should not be relied upon in connection with making any investment in our shares.

This prospectus supplement and the accompanying base prospectus are part of a registration statement on Form S-3 (File No. 333-280617) that we filed with the SEC. This prospectus supplement and the accompanying base prospectus do not contain all of the information set forth in the registration statement and the exhibits thereto. You may obtain the full registration statement from the SEC or us (as described below). Forms of the documents establishing the terms of the shares are or may be filed as exhibits to the registration statement or documents incorporated by reference in the registration statement. Statements in this prospectus supplement are qualified in all respects by reference to the documents to which they refer. You should refer to the actual documents for a more complete description of the relevant matters.

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<div align='center'>S-35</div>

INCORPORATION BY REFERENCE The SEC allows us to “incorporate by reference” the information we have filed with it, which means that we can disclose important information to you by referring you to those documents filed separately with the SEC. The information incorporated by reference is deemed to be part of this prospectus supplement, and subsequent information that we file with the SEC will automatically update and supersede that information. We have incorporated by reference the documents listed below and any future filings we make with the SEC under Sections 13(a), 13(c), 14 or 15(d) of the Exchange Act (other than information “furnished” and not “filed” with the SEC, unless we specifically provide that such “furnished” information is to be incorporated by reference) until the completion or termination of this offering. The documents we incorporate by reference are:

Any statement contained in a document incorporated or deemed to be incorporated by reference into this prospectus supplement will be deemed to be modified or superseded for purposes of this prospectus supplement to the extent that a statement contained in this prospectus supplement or any other subsequently filed document that is deemed to be incorporated by reference into this prospectus supplement modifies or supersedes the statement. Any statement so modified or superseded will not be deemed, except as so modified or