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 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 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%.

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.

There have been no reportable transactions with respect to the Shares within the last 60 days by the Reporting Persons.

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.

Not applicable.

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.

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).