Insider filing report for Changes in Beneficial Ownership
- Schedule 13G & 13D forms are used to report a party's ownership of stock which exceeds 5% of a company's total stock issue.
- Schedule 13G is a shorter version of Schedule 13D with fewer reporting requirements.
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SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549 |
SCHEDULE 13D
Under the Securities Exchange Act of 1934
(Amendment No. 9)*
|
Transocean Ltd. (Name of Issuer) |
Shares, $0.10 par value (Title of Class of Securities) |
H8817H100 (CUSIP Number) |
c/o Debra Kupferman Turmstrasse 30,, Steinhausen, V8, CH-6312 41 41 749 0500 (Name, Address and Telephone Number of Person Authorized to Receive Notices and Communications) |
02/09/2026 (Date of Event Which Requires Filing of This Statement) |
If the filing person has previously filed a statement on Schedule 13G to report the acquisition that is the subject of this Schedule 13D, and is filing this schedule because of §§ 240.13d-1(e), 240.13d-1(f) or 240.13d-1(g), check the following box.


The information required on the remainder of this cover page shall not be deemed to be “filed” for the purpose of Section 18 of the
Securities Exchange Act of 1934 (“Act”) or otherwise subject to the liabilities of that section of the Act but shall be subject to all other
provisions of the Act (however, see the Notes).
SCHEDULE 13D
|
| CUSIP No. | H8817H100 |
| 1 |
Name of reporting person
Frederik W. Mohn | ||||||||
| 2 | Check the appropriate box if a member of a Group (See Instructions)
(a)
(b)
| ||||||||
| 3 | SEC use only | ||||||||
| 4 |
Source of funds (See Instructions)
OO | ||||||||
| 5 |
Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)
![]() | ||||||||
| 6 | Citizenship or place of organization
NORWAY
| ||||||||
| Number of Shares Beneficially Owned by Each Reporting Person With: |
| ||||||||
| 11 | Aggregate amount beneficially owned by each reporting person
96,918,301.00 | ||||||||
| 12 | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)
![]() | ||||||||
| 13 | Percent of class represented by amount in Row (11)
8.8 % | ||||||||
| 14 | Type of Reporting Person (See Instructions)
IN |
Comment for Type of Reporting Person:
(1) See Item 3 for additional information regarding the source of funds reported in Row (4). (2) The amounts reported in Row (7) and Row (9) include (a) 22,148 Shares individually owned by Mr. Mohn and (b) 321,259 Shares issuable in relation to vested restricted share units Mr. Mohn has the right to receive based upon his service as a director of Transocean Ltd., a company organized under the laws of Switzerland (the "Issuer"). (3) The amounts reported in Row (8), Row (10) and Row (11) include 96,574,894 Shares owned by Perestroika (Cyprus) Ltd. (4) The percentage reported in Row (13) is based upon the 1,101,441,205 Shares outstanding as of October 23, 2025, as disclosed by the Issuer in the Issuer's Quarterly Report on Form 10-Q filed with the U.S. Securities and Exchange Commission on October 30, 2025.
SCHEDULE 13D
|
| CUSIP No. | H8817H100 |
| 1 |
Name of reporting person
Perestroika AS | ||||||||
| 2 | Check the appropriate box if a member of a Group (See Instructions)
(a)
(b)
| ||||||||
| 3 | SEC use only | ||||||||
| 4 |
Source of funds (See Instructions)
OO | ||||||||
| 5 |
Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)
![]() | ||||||||
| 6 | Citizenship or place of organization
NORWAY
| ||||||||
| Number of Shares Beneficially Owned by Each Reporting Person With: |
| ||||||||
| 11 | Aggregate amount beneficially owned by each reporting person
96,574,894.00 | ||||||||
| 12 | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)
![]() | ||||||||
| 13 | Percent of class represented by amount in Row (11)
8.8 % | ||||||||
| 14 | Type of Reporting Person (See Instructions)
CO |
Comment for Type of Reporting Person:
(1) See Item 3 for additional information regarding the source of funds reported in Row (4). (2) The amounts reported in Row (8), Row (10) and Row (11) include 96,574,894 Shares owned by Perestroika (Cyprus) Ltd. (3) The percentage reported in Row (13) is based upon the 1,101,441,205 Shares outstanding as of October 23, 2025, as disclosed by the Issuer in the Issuer's Quarterly Report on Form 10-Q filed with the U.S. Securities and Exchange Commission on October 30, 2025.
SCHEDULE 13D
|
| CUSIP No. | H8817H100 |
| 1 |
Name of reporting person
Perestroika (Cyprus) Ltd | ||||||||
| 2 | Check the appropriate box if a member of a Group (See Instructions)
(a)
(b)
| ||||||||
| 3 | SEC use only | ||||||||
| 4 |
Source of funds (See Instructions)
OO | ||||||||
| 5 |
Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)
![]() | ||||||||
| 6 | Citizenship or place of organization
CYPRUS
| ||||||||
| Number of Shares Beneficially Owned by Each Reporting Person With: |
| ||||||||
| 11 | Aggregate amount beneficially owned by each reporting person
96,574,894.00 | ||||||||
| 12 | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)
![]() | ||||||||
| 13 | Percent of class represented by amount in Row (11)
8.8 % | ||||||||
| 14 | Type of Reporting Person (See Instructions)
CO |
Comment for Type of Reporting Person:
(1) See Item 3 for additional information regarding the source of funds reported in Row (4). (2) The percentage reported in Row (13) is based upon the 1,101,441,205 Shares outstanding as of October 23, 2025, as disclosed by the Issuer in the Issuer's Quarterly Report on Form 10-Q filed with the U.S. Securities and Exchange Commission on October 30, 2025.
SCHEDULE 13D
|
| Item 1. | Security and Issuer | |
| (a) | Title of Class of Securities:
Shares, $0.10 par value | |
| (b) | Name of Issuer:
Transocean Ltd. | |
| (c) | Address of Issuer's Principal Executive Offices:
Turmstrasse 30, Steinhausen,
SWITZERLAND
, CH-6312. | |
Item 1 Comment:
This Amendment No. 9 to Schedule 13D (this "Amendment") amends the statement on Schedule 13D previously jointly filed by Frederik W. Mohn ("Mr. Mohn"), Perestroika AS, a Norwegian private limited company ("Perestroika AS"), Perestroika (Cyprus) Ltd., a Cyprus private limited company and a wholly owned subsidiary of Perestroika AS ("Perestroika Sub" and together with Perestroika AS, "Perestroika"), with the U.S. Securities and Exchange Commission on September 30, 2025, as previously amended (the "Prior Schedule 13D"). As used herein, "Reporting Persons" refers to Mr. Mohn, Perestroika AS and Perestroika Sub. Unless set forth in this Amendment, all Items are unchanged from the Prior Schedule 13D. Capitalized terms used and not defined herein shall have the meanings ascribed to them in the Prior Schedule 13D. | ||
| Item 3. | Source and Amount of Funds or Other Consideration | |
Item 3 is hereby amended by adding the following: On November 24, 2025, Perestroika Sub purchased 1,500,000 Shares at a price of $4.02 per Share. The purchase was made using cash from Perestroika's ongoing operations. | ||
| Item 4. | Purpose of Transaction | |
Item 4 of the Prior Schedule 13D is hereby amended and supplemented by adding the following at the end thereof: On February 9, 2026, the Issuer and Valaris Limited, an exempted company limited by shares incorporated under the laws of Bermuda ("Valaris") (the Issuer and Valaris, collectively, the "Parties" and each, a "Party"), entered into a Business Combination Agreement (the "Agreement") providing for the combination of the two Parties. Pursuant to the Agreement, and on the terms and subject to the conditions thereof, the Issuer will acquire of all the issued and outstanding common shares, par value $0.01 each, of Valaris (the "Valaris Shares") in exchange for Shares, at an exchange ratio of 15.235 Shares for each Valaris Share. In connection with the execution of the Agreement, the Reporting Persons entered into a Support Agreement with Valaris (the "Support Agreement"). The Support Agreement provides, on the terms and subject to the conditions thereof, that each Reporting Person will vote the Shares owned by such Reporting Person at the time of the applicable shareholder meeting in favor of the transactions contemplated by the Agreement. The disclosure contained under the heading "Support Agreement" in Item 6 is incorporated herein by reference. | ||
| Item 5. | Interest in Securities of the Issuer | |
| (a) | Item 5 is deleted in its entirety and replaced with the following: The aggregate number and percentage of Shares (including Shares issued upon the Exchange Transaction) beneficially owned by the Reporting Persons are as follows (based upon the 1,101,441,205 Shares outstanding as of October 23, 2025, as disclosed by the Issuer in the Issuer's Quarterly Report on Form 10-Q filed with the U.S. Securities and Exchange Commission on October 30, 2025): (i) Mr. Mohn beneficially owns 96,918,301 Shares, or approximately 8.8%. (ii) Perestroika AS beneficially owns 96,574,894 Shares, or approximately 8.8%; and (iii) Perestroika Sub beneficially owns 96,574,894 Shares, or approximately 8.8%. | |
| (b) | Mr. Mohn has: (i) sole power to vote or direct the vote of 343,407 Shares; (ii) shared power to vote or direct the vote of 96,574,894 Shares; (iii) sole power to dispose or direct the disposition of 343,407 Shares; and (iv) shared power to dispose or direct the disposition of 96,574,894 Shares. Perestroika AS has: (i) sole power to vote or direct the vote of 0 Shares; (ii) shared power to vote or direct the vote of 96,574,894 Shares; (iii) sole power to dispose or direct the disposition of 0 Shares; and (iv) shared power to dispose or direct the disposition of 96,574,894 Shares. Perestroika Sub has: (i) sole power to vote or direct the vote of 0 Shares; (ii) shared power to vote or direct the vote of 96,574,894 Shares; (iii) sole power to dispose or direct the disposition of 0 Shares; and (iv) shared power to dispose or direct the disposition of 96,574,894 Shares. | |
| (c) | There have been no reportable transactions with respect to the Shares within the last 60 days by the Reporting Persons. | |
| (d) | Except as set forth herein, no other person is known by the Reporting Persons to have the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of, Shares beneficially owned by the Reporting Persons. | |
| (e) | Not applicable. | |
| Item 6. | Contracts, Arrangements, Understandings or Relationships With Respect to Securities of the Issuer | |
Item 6 is hereby amended by adding the following: Support Agreement On February 9, 2026, in connection with the Agreement, each of the Reporting Persons entered into the Support Agreement with Valaris. The Support Agreement provides, on the terms and subject to the conditions thereof, that each Reporting Person will vote the Shares owned by such Reporting Person at the time of the applicable shareholder meeting in favor of the transactions contemplated by the Agreement. The foregoing description of the Support Agreement is not complete and is qualified by reference to the form of Support Agreement filed as Exhibit XI to this Schedule 13D, which is incorporated herein by reference. To the extent the Support Agreement specifically references the Agreement, the foregoing description of the Support Agreements is also qualified by reference to the specific references to the Agreement filed as Exhibit XII to this Schedule 13D, which specific references are incorporated herein by reference. | ||
| Item 7. | Material to be Filed as Exhibits. | |
XI Support Agreement, dated as of February 9, 2026, by and among Valaris and the Reporting Persons. XII Business Combination Agreement, dated as of February 9, 2026, between Transocean Ltd. and Valaris Limited (incorporated by reference to Exhibit 2.1 to the Issuer's Current Report on Form 8-K (Commission File No. 001-38373) filed on February 10, 2026) (only those portions of the Agreement that are specifically referenced by the Agreement are filed under this Item 7). | ||
| SIGNATURE | |
After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.
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(b)