Business Description

Overview Transocean Ltd. (together with its subsidiaries and predecessors, unless the context requires otherwise, “Transocean,” the “Company,” “we,” “us” or “our”) is a leading international provider of offshore contract drilling services for oil and gas wells. As of February 17, 2026, we owned or had partial ownership interests in and operated 27 mobile offshore drilling units, consisting of 20 ultra-deepwater drillships and seven harsh environment semisubmersibles. We provide, as our primary business, contract drilling services in a single operating segment, which involves contracting our mobile offshore drilling rigs, related equipment and work crews to drill oil and gas wells. We specialize in technically demanding regions of the global offshore drilling business with a particular focus on ultra-deepwater and harsh environment drilling services. Our drilling fleet is one of the most versatile fleets in the world, consisting of drillships and semisubmersible floaters used in support of offshore drilling activities and offshore support services on a worldwide basis. Transocean Ltd. is a Swiss corporation with its registered office in Steinhausen, Canton of Zug, and with principal executive offices located at Turmstrasse 30, 6312 Steinhausen, Switzerland. Our telephone number at that address is +41 41 749-0500. Our shares are listed on the New York Stock Exchange under the ticker symbol “RIG.” On February 9, 2026, we and Valaris entered into a Business Combination Agreement (the "Agreement") providing for the Business Combination. Pursuant to the Agreement, and on the terms and subject to the conditions thereof, we will acquire all of the issued and outstanding common shares, par value $0.01 each, of Valaris (the “Valaris Shares”) in exchange for Transocean Ltd. shares, par value $0.10 each, at an exchange ratio of 15.235 Transocean Ltd. shares for each Valaris Share. For information about the revenues, operating income, assets and other information related to our business, our agreement to acquire of Valaris, and the geographic areas in which we operate, see “ Part II. Item 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations ” and “Part II. Item 8. Financial Statements and Supplementary Data—Notes to Consolidated Financial Statements— Note 1—Business , Note 5—Revenues and Note 6—Long-Lived Assets .” Drilling Fleet Overview —We provide contract drilling services using our fleet of mobile offshore drilling units, including both drillships and semisubmersibles, broadly referred to as floaters. Floaters are designed to operate in locations away from port for extended periods of time and have living quarters for the crews, a helicopter landing deck and storage space for drill pipe, riser and drilling supplies. Our drilling units and related equipment are suitable for both exploration and development, and we engage in both types of activities. Our fleet of floaters consists of ultra-deepwater drillships and harsh environment semisubmersibles that are designed with high-specification capabilities to operate in the technically demanding regions of the global offshore drilling business. Ultra-deepwater floaters are equipped with high-pressure mud pumps and are capable of drilling in water depths of 4,500 feet or greater. Harsh environment floaters are capable of drilling in harsh environments in water depths between 1,500 and 10,000 feet and typically have greater displacement than other semisubmersibles, which offers larger variable load capacity, more useable deck space and better motion characteristics. Drillship features —Drillships are floating vessels that are shaped like conventional ships, generally self-propelled and considered to be the most mobile of the major rig types. Drillships typically have greater deck load and storage capacity than semisubmersible rigs, which provides logistical and resupply efficiency benefits for customers. Drillships are generally better suited to operations in calmer sea conditions and typically do not operate in areas considered to be harsh environments. All of our high-specification drillships are equipped with dynamic positioning thruster systems, which allows them to maintain position without anchors through the use of onboard propulsion and station-keeping systems. We have two drillships that are equipped with an industry-leading, 1,700 short ton hoisting capacity.…