FORM10-Q ☑QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d)OF THE SECURITIES EXCHANGE ACTOF 1934 For the quarterly period ended June30, 2026OR ☐TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d)OF THE SECURITIES EXCHANGE ACTOF 1934For the transition period from _____ to _____ Commission file number 001-38373 TransoceanLtd.(Exact name of registrant as specified in its charter) (State or other jurisdiction of incorporation or organization) (I.R.S. Employer Identification No.) 6312 (Zip Code) +41 (41) 749-0500(Registrant’s telephone number, including area code) Securities registered pursuant to Section 12(b) of the Act: Indicate by check mark whether the registrant (1)has filed all reports required to be filed by Section13 or 15(d)of theSecurities Exchange Act of 1934 during the preceding 12months (or for such shorter period that the registrant was required to filesuch reports), and (2)has been subject to such filing requirements for the past 90days.YesNo◻ Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submittedpursuant to Rule405 of RegulationS-T (§232.405 of this chapter) during the preceding 12months (or for such shorter period thatthe registrant was required to submit such files).YesNo◻ Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smallerreporting company or an emerging growth company.See the definitions of “large accelerated filer,” “accelerated filer,” “smallerreporting company” and “emerging growth company” in Rule12b-2 of the Exchange Act. Large accelerated filerAccelerated filer◻Non-accelerated filer◻Smaller reporting company☐Emerging growth company☐ Indicate by check mark whether the registrant is a shell company (as defined in Rule12b-2 of the Exchange Act).Yes☐ As of July28, 2026, 1,116,880,085 shares were outstanding. TRANSOCEANLTD. AND SUBSIDIARIESINDEX TO QUARTERLY REPORT ON FORM10-QQUARTER ENDED JUNE30, 2026 TRANSOCEANLTD. AND SUBSIDIARIESCONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS(inmillions, except per share data) (Unaudited) Income (loss) before income taxes184(1,093)201(1,133)Income tax expense (benefit)14(155)(40)(116)Net income (loss)$ 170$ (938) $ 241$(1,017) TABLE OF CONTENTS TRANSOCEANLTD. AND SUBSIDIARIESCONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)(inmillions) (Unaudited) See accompanying notes. TRANSOCEANLTD. AND SUBSIDIARIESCONDENSED CONSOLIDATED BALANCE SHEETS(inmillions, except par value) See accompanying notes. TRANSOCEANLTD. AND SUBSIDIARIESCONDENSED CONSOLIDATED STATEMENTS OF EQUITY(inmillions) See accompanying notes. TRANSOCEANLTD. AND SUBSIDIARIESCONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS(inmillions) (Unaudited) Six months endedJune30,20262025Cash flows from operating activitiesNet income (loss)$241$(1,017)Adjustments to reconcile to net cash provided by operating activities:Depreciation and amortization291351Share-based compensation expense1516Loss on impairment of assets—1,136Gain on disposal of assets, net(2)(9)Amortization of debt-related balances, net2025(Gain) loss on adjustment to bifurcated compound exchange feature19(65)Loss on retirement of debt11—Deferred income tax benefit(73)(157)Other, net(1)31Changes in contract liabilities, net(83)(84)Changes in deferred costs, net4616Changes in other operating assets and liabilities, net(84)(89)Net cash provided by operating activities400154 See accompanying notes. TRANSOCEANLTD. AND SUBSIDIARIESNOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS(Unaudited) NOTE1—BUSINESS Overview TransoceanLtd.(together with its subsidiaries and predecessors,unless the context requiresotherwise, “Transocean,” “we,” “us” or “our”) is a leading international provider of offshore contract drillingservices for oil and gas wells.As of June30, 2026, we owned or had partial ownership interests in andoperated a fleet of 27mobile offshore drilling units, consisting of 20ultra-deepwater drillships and sevenharshenvironment semisubmersibles. Agreement to acquire ValarisLimited On February9, 2026, we and ValarisLimited, an exempted company limited by shares incorporatedunder the laws of Bermuda, ("Valaris") entered into a Business Combination Agreement (the "Agreement"),providing for the combination of Transocean and Valaris (the "Business Combination").Pursuant to theAgreement, and on the terms and subject to the conditions thereof, we will acquire all of the issued andoutstanding common shares, par value $0.01each, of Valaris (the “Valaris Shares”) in exchange forTransoceanLtd. shares, par value $0.10each, at an exchange ratio of 15.235TransoceanLtd. shares for eachValaris Share.Pursuant to the Agreement, and on the terms and subject to the conditions thereof, at the timeon which the order of the Supreme Court of Bermuda providing for its sanction of the Scheme of Arrangementis filed with the Registrar of Companies of Bermuda, the Bus