Transocean files Item 7.01 Reg FD; Exhibit 99.1 Fleet update

Rhea-AI Filing Summary

Transocean Ltd. furnished a “Transocean Fleet Status Report” under Item 7.01 Regulation FD Disclosure, providing drilling rig status and contract information.

The report is dated October 15, 2025 and is attached as Exhibit 99.1. The company posts Fleet Status Reports quarterly on its investor website and offers free email alerts for press releases, financial updates, and links to the report.

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UNITED STATES
SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

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FORM 8-K

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CURRENT REPORT
Pursuant to Section 13 or 15(d) of
the Securities Exchange Act of 1934

Date of report (date of earliest event reported): October 15, 2025

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TRANSOCEAN LTD.

(Exact name of Registrant as specified in its charter)

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Switzerland		001-38373		98-0599916
(State or other jurisdiction of	​	(Commission	​	(I.R.S. Employer
incorporation or organization)	​	File Number)	​	Identification No.)

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Turmstrasse 30		​
Steinhausen, Switzerland	​	CH-6312
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(Address of principal executive offices)	​	(zip code)

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Registrant’s telephone number, including area code: +41 (41) 749-0500

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Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

☐Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

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☐Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

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☐Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

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☐Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

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Securities registered pursuant to Section 12(b) of the Act
Title of each class	Trading Symbol	Name of each exchange on which registered:
Shares, $0.10 par value	RIG	New York Stock Exchange

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

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Emerging growth company ☐

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If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

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Item 7.01Regulation FD Disclosure.

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We issue a report entitled “Transocean Fleet Status Report,” which includes drilling rig status and contract information. A report dated October 15, 2025, is furnished as Exhibit 99.1 to this Current Report on Form 8-K and is incorporated herein by reference. You may subscribe to the Transocean “E-mail Alerts,” which based upon your selections will alert you to new Transocean press releases, financial and other updates. This free service will send you an automated email containing the Fleet Status Report press release and a link to our website: www.deepwater.com, where the reports are posted each quarter under “Investors/Fleet Status Report.” You may subscribe to this service in the footer of any of the website’s Investors pages by selecting “E-mail Alerts” then providing your email address. Please select the alerts to which you prefer to subscribe and click “Submit.”

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Item 9.01  Financial Statements and Exhibits.

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(d)  Exhibits.

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Exhibit No.	​	Description
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99.1	​	Fleet Status Report dated October 15, 2025
101	​	Interactive data files pursuant to Rule 405 of Regulation S-T formatted in Inline Extensible Business Reporting Language
104	​	Cover Page Interactive Data File (formatted as inline XBRL).
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SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

​	TRANSOCEAN LTD.
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Date: October 15, 2025	By:	/s/ Daniel Ro-Trock
​	​	Daniel Ro-Trock
​	​	Authorized Person

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FAQ

What did Transocean (RIG) announce in this filing?

Transocean furnished its Fleet Status Report under Item 7.01 Regulation FD Disclosure, detailing drilling rig status and contract information.

What is the date of Transocean’s latest Fleet Status Report?

The report is dated October 15, 2025 and is attached as Exhibit 99.1.

Where can I find Transocean’s Fleet Status Reports?

They are posted quarterly on the company’s website under Investors/Fleet Status Report.

How can I receive alerts about new Transocean updates?

Subscribe to E‑mail Alerts in the footer of the Investors pages to receive press releases and links to the Fleet Status Report.

Which exhibit contains the Fleet Status Report in this filing?

Exhibit 99.1 contains the Fleet Status Report dated October 15, 2025.

What NYSE symbol does Transocean trade under?

Transocean’s NYSE trading symbol is RIG.