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TRANSOCEAN LTD._February 19, 2026 0001451505false00014515052026-02-192026-02-19

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

​

CURRENT REPORT

PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of report (date of earliest event reported): February 19, 2026

TRANSOCEAN LTD.

(Exact name of registrant as specified in its charter) ​ ​ ​

​

​

Switzerland 001-38373 98-0599916

(State or other jurisdiction of incorporation or organization) (Commission file number) (I.R.S. Employer Identification No.)

​ ​ ​

Turmstrasse 30 Steinhausen, Switzerland ​

CH-6312

(Address of principal executive offices) ​ (Zip Code)

​ ​ ​

+41 (41) 749-0500

(Registrant’s telephone number, including area code)

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 (see General Instruction A.2. below): ☐ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425) ☐ Soliciting material pursuant to Rule 14a-12 under the Securities Act (17 CFR 240.14a-12) ☐ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)) ☐ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c)) ​ 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 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). Emerging growth company ☐ 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. ☐ ​ ​ ​

Item 2.02. Results of Operations and Financial Condition

Transocean Ltd.’s press release dated February 19, 2026, concerning financial results for the fourth quarter and full year 2025, furnished as Exhibit 99.1 to this report, is incorporated by reference herein. Item 7.01. Regulation FD Disclosure

We issue a report entitled “Transocean Fleet Status Report,” which includes drilling rig status and contract information. A report dated February 19, 2026, is furnished as Exhibit 99.2 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.” Item 9.01. Financial Statements and Exhibits

(d)  Exhibits ​ ​ ​

​

Number Description

99.1 Press Release Reporting Fourth Quarter and Full Year 2025 Financial Results

99.2 Fleet Status Report dated February 19, 2026

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)

​ ​

​

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.

​ ​

​ ​ ​

Date: February 19, 2026 By /s/ Debra Kupferman

​ ​ Debra Kupferman

​ ​ Authorized Person

​ ​ ​ ​

TRANSOCEAN LTD._October 29, 2025 0001451505false00014515052025-10-292025-10-29

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

​

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 29, 2025

TRANSOCEAN LTD.

(Exact name of registrant as specified in its charter) ​ ​ ​

​

​

Switzerland 001-38373 98-0599916

(State or other jurisdiction of incorporation or organization) (Commission file number) (I.R.S. Employer Identification No.)

​ ​ ​

Turmstrasse 30 Steinhausen, Switzerland ​

CH-6312

(Address of principal executive offices) ​ (Zip Code)

​ ​ ​

+41 (41) 749-0500

(Registrant’s telephone number, including area code)

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 (see General Instruction A.2. below): ☐ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425) ☐ Soliciting material pursuant to Rule 14a-12 under the Securities Act (17 CFR 240.14a-12) ☐ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)) ☐ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c)) ​ 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 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). Emerging growth company ☐ 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. ☐ ​ ​ ​

Item 2.02. Results of Operations and Financial Condition

Transocean Ltd.’s press release dated October 29, 2025, concerning financial results for the third quarter 2025, furnished as Exhibit 99.1 to this report, is incorporated by reference herein. Item 9.01. Financial Statements and Exhibits

(d)  Exhibits The exhibit to this report is furnished pursuant to Item 9.01 as follows: ​ ​ ​

​

Number Description

99.1 Press Release Reporting Third Quarter 2025 Financial Results

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)

​ ​

​

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.

​ ​

​ ​ ​

Date: October 29, 2025 By /s/ Daniel Ro-Trock

​ ​ Daniel Ro-Trock

​ ​ Authorized Person

​ ​ ​ ​