Transocean LTD.

Item 1.01 Entry into a Material Definitive Agreement. On October 15, 2026, Transocean International Limited (the “Company”), a wholly owned subsidiary of Transocean Ltd., entered into an amended and restated credit agreement with Citibank, N.A., as administrative agent and collateral agent, and certain lenders party thereto (the “A&R Credit Agreement”), the effectiveness of which is subject to the closing of Transocean Ltd.’s previously announced acquisition of all of the issued and outstanding common shares of Valaris Limited and the satisfaction or waiver of customary conditions for a secured credit facility. Upon its effectiveness, the A&R Credit Agreement will amend and restate the Company’s existing credit agreement dated June 22, 2018 (as previously amended, the “Existing Credit Agreement” and, the existing revolving credit facility under the Existing Credit Agreement as amended and restated by the A&R Credit Agreement, the “Revolving Credit Facility”) to, among other things, (i) extend the scheduled maturity date thereof from June 2028 to October 2031, (ii) increase the total amount of revolving commitments thereunder to $750 million from $510 million, and (iii) modify certain covenants and other terms thereunder. The Revolving Credit Facility will continue to be guaranteed by Transocean Ltd. and certain subsidiaries and secured by certain drilling rigs and related collateral. The Existing Credit Agreement remains in full force and effect until the A&R Credit Agreement becomes effective. If the conditions to effectiveness of the A&R Credit Agreement are not satisfied or waived by May 9, 2027, the lenders’ commitments thereunder will automatically terminate. The foregoing description of the Revolving Credit Facility does not purport to be complete and is qualified in its entirety by the A&R Credit Agreement, which is filed herewith as Exhibit 10.1 to this Current Report on Form 8-K and incorporated by reference herein.

Item 2.03 Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant. The information described in Item 1.01 is incorporated herein by reference.

Item 7.01 Regulation FD Disclosure. The information described in Item 1.01 is incorporated herein by reference. Separately, Transocean retired the 8.00% Senior Secured Notes due 2028 (the “Aquila Notes”) in full on October 1, 2026. The outstanding principal amount of $165 million, plus a call premium and accrued but unpaid interest, was settled using cash on hand and funds from the associated debt service reserve account. Interest expense savings to maturity is approximately $22 million. The early retirement of the Aquila Notes reflects the company’s commitment to prioritize deleveraging, reduce interest expense and simplify the balance sheet. A copy of the press release announcing the amended and restated credit agreement and redemption of notes referred to above is attached hereto and incorporated herein by reference as Exhibit 99.1.