Transocean Ltd.

2025 Swiss Non-Financial Matters Report

*This Swiss Non-Financial Matters Report (“Report”) was prepared in accordance with the requirements of Article 964b of the Swiss Code of Obligations (“CO”) for Transocean Ltd. and its subsidiaries (collectively, “Transocean,” the “Company,” “we,” “us” or “our”). As permitted by the Swiss Ordinance on Climate Matters (the “Ordinance”), the Company does not align with a climate concept as defined by Article 2 para. 2 letter b of the Ordinance, limiting its reporting to environmental matters pursuant to Article 964b para. 1 CO. This is because, among other things, the Company does not have specified quantitative targets for emissions reductions. However, in line with Article 964b CO and the environmental-related disclosure requirements applicable to non-financial matters, we describe our practices and due diligence with respect to climate change, the measures we take to implement these practices, the main climate-related risks arising from our own activities and, where relevant, from our business relationships, how we manage those risks and the main indicators we use to monitor our climate-related performance.”

Our Business and Business Model

Transocean is a leading international provider of offshore contract drilling services for oil and gas wells. As of February 19, 2026, we owned or had partial ownership interests in and operated 27 mobile offshore drilling units, consisting of 20 ultra-deepwater floaters and seven harsh environment floaters.

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 professional 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. The Company’s shares are listed on the New York Stock Exchange under the ticker symbol “RIG.” For information about the revenues, operating income, assets and other information related to our business and the geographic areas in which we operate, please see the Company’s latest annual report on Form 10-K, available at https://investor.deepwater.com/sec-filings.

Topics Covered by this Report

Pursuant to CO 964b, the Company prepared this Report covering the following required non-financial matters (collectively, “Swiss Non-Financial Matters”):

Transocean 2026 APB-1 Proxy Statement

Organization and Governance** – Swiss Non-Financial Matters**

The Board exercises overall oversight of the Company’s sustainability practices and initiatives and has delegated oversight to its committees as follows:

For detailed information on the specific responsibilities of the Board’s committees, please refer to the committee charters available at www.deepwater.com/investors/corporate-governance.

Transocean’s President and Chief Executive Officer (“CEO”) plays an essential role in the development and execution of the Company's sustainability strategies, initiatives, and opportunities. The Executive Vice President & Chief Legal Officer (“CLO”) is the functional executive responsible for facilitating the Company’s sustainability strategies, coordination cross-functionally, and disclosures. Together, the CEO, CLO, and other executives integrate certain sustainability principles into the design of applicable business processes and activities, with the aim of creating a cohesive, adaptable approach toward sustainability that aligns with Company objectives. The CLO reports directly to the CEO, and he and his reports act as the primary liaison to the Board for sustainability matters.

The Company’s Legal Compliance and Ethics (“LCE”) Department, under the supervision of the CLO and with oversight from the Audit Committee, is responsible for implementing standards and tools to promote ethical conduct at Transocean. The LCE Department oversees compliance with non-operational laws and regulations as well as all ethical guidelines.

Executive management is responsible for the day-to-day management of the risks the Company faces, while our Board, including through its various committees, is responsible for the oversight of the Company’s risk management. The Board oversees (1) the design, implementation and execution of risk management processes designed to support the Company’s corporate strategy and (2) steps designed, implemented and executed to foster a culture in which each employee understands his or her impact on the assessment and management of risk, his or her responsibility for acting within appropriate limits, and his or her ultimate accountability.

The Company has an Enterprise Risk Management process and framework, which includes an Executive Risk Management Committee and a Risk Committee Working Group. The Executive Risk Management Committee is composed of members of senior management, including our CEO and other members of management in key functions of the Company. The Risk Committee Working Group is composed of representatives of all key functions of the Company. The duties of the Executive Risk Management Committee and the Risk Committee Working Group include the following:

Transocean 2026 APB-2 Proxy Statement

The Executive Risk Management Committee and/or members of management present reports on risk management activities to the Board, at least annually. Risks are identified within each function. The cross-functional Risk Committee Working Group assesses risks facing the Company, and associated preventive and mitigating controls. Relevant ESG risks are discussed in these sessions and include topics such as weather events, crew safety, and retention of key employees. The Risk Committee Working Group then makes recommendations for improvement opportunities to senior management, as appropriate. Our management and Board continue to assess and respond to various risks that affect our industry, our Company and our employees, including but not limited to, operational offshore drilling risks, public health threats, market fluctuations among commodities and the costs and accessibility of goods and services procured throughout our supply chain.

Business Performance** and Results**

Please refer to the Company’s latest annual report on Form 10-K, available athttps://investor.deepwater.com/sec-filings, for information about the Company’s business performance and results for the periods referenced therein.

Risk Factors

The Company’s business involves various risks, and the Company provides information about the main risks, including risk pertaining to the Swiss Non-Financial Matters topics covered by this Report, in its latest annual report on Form 10-K and its latest quarterly report on Form 10-Q, as applicable, available athttps://investor.deepwater.com/sec-filings.

Approach to****Swiss Non-Financial Matters

The Company integrates sustainability principles throughout the organization, whether associated with our core business of drilling oil and gas wells or otherwise.

The industry outlook for our core business is positive, based upon underlying economic factors, including numerous long-term forecasts that indicate hydrocarbons will continue to be a critical source of energy for the foreseeable future, despite significant relative growth in alternative energy technologies. We believe that these factors will contribute to robust demand for oil and gas. For additional information, please refer to our latest annual report on Form 10-K, Part II. Item 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations — Outlook, available athttps://investor.deepwater.com/sec-filings.

However, we recognize that oil and gas resources alone are not sufficient to meet the growing global energy demands. Our assets, core competencies, and capabilities also apply to renewables and other energy alternatives. We have continued to opportunistically pursue adjacent energy-related projects, which leverage our ultra-deepwater operations experience in offshore drilling. For example, we have invested in and are working with two companies engaged in exploration and development preparation work associated with deep-sea polymetallic nodules that contain metals such as manganese, nickel, and cobalt; these elements are needed to support the growing renewable energy market. Additional information about this work can be found in our latest annual report on Form 10-K, Item 8, Note 4 – Unconsolidated Affiliates.

The Company recognizes the evolving landscape of sustainability regulations and associated disclosure requirements. By adapting to the evolving expectations of investors and regulators, and maintaining a dialogue about sustainability matters, the Company is better positioned to proactively address sustainability challenges and recognize opportunities.

Transocean 2026 APB-3 Proxy Statement

Engagement

As we develop and refine our sustainability framework in line with applicable requirements, we have been guided, in part, by our sustainability-focused engagements with the following groups: shareholders; customers; vendors; the Board, management and employees; industry organizations; and community groups.

These efforts included in-depth discussions, participation in surveys, and/or reviewing certain stewardship guidelines. We have also actively participated in relevant organizations, committees, and industry events, advocating for the adoption of best practices and responsible operations in offshore drilling.

Our engagement efforts guided our materiality assessment and resulted in the identification of the sustainability material topics for the Company, including Energy Efficiency, Loss of Containment, Safety, Our Workforce, Human Rights, and Business Ethics, which are addressed our sustainability strategy and covered in this report.

Environmental Matters

We strive to deliver services in a manner that minimizes the impact our business has on the environment. We continuously seek ways to advance our commitment to safely performing operations while simultaneously safeguarding the ultra deepwater and harsh environments in which we work. The Company’s environmental practice is to operate in a manner that minimizes the environmental impact of its offshore drilling operations, with a focus on energy efficiency and the prevention of releases to the environment. We monitor our practices through our environmental management system and related procedures, which form part of the Company’s due diligence with respect to environmental matters.

We maintain a global Environmental Management System (EMS) that we apply to all our rigs, offices and facilities. The EMS provides a framework to consistently manage our worldwide operations in an environmentally responsible manner and monitor our performance. Within this framework, we regularly assess the environmental impact of operations, focusing on the reduction of greenhouse gas emissions, operational discharges, water use and waste. Our EMS, paired with our Operations Management System (“OMS”), sets forth the processes by which we seek to identify, consider and potentially mitigate certain environmental impacts when planning and executing our operations. Our Company operates under an integrated management system that is certified to ISO 14001.

Our approach to managing our environmental impact is driven by our commitment to work safely and in pursuit of operational excellence. Our EMS is administered by our Vice President, Health, Safety and Environment, and applies to all Transocean facilities onshore and offshore. These EMS and OMS policies govern our management of waste, water, and other resources in our facilities, aid in our compliance with all regulatory requirements, and help to guide the evaluation of our environmental performance. Consistent with our internal policies, all active rigs maintain individual rig energy management plans, which are aligned with ISO 50001 and International Maritime Organization (IMO) SEEMP frameworks. Further, the Company operates under an integrated management system that is certified to ISO 50001.

All reportable loss of containment events are recorded within the Company’s incident reporting system and significant events are reviewed by management. Findings and lessons learned from incident reviews are communicated across the fleet to improve future performance. Management regularly reports loss of containment performance to the Board‘s GSE Committee.

Energy Efficiency and Climate

Diesel fuel engines are used to generate power on the Company’s rigs, and they produce greenhouse gas emissions, including carbon dioxide. To reduce emissions, it is critical to minimize fuel consumption and optimize power-management systems. To do so, we focus on both sides of the energy-management equation — how we generate and consume power, and how we can optimize this balance while sustaining the safety and efficiency of operations. Initiatives to reduce emissions include replacing traditional incandescent lighting with lower energy-consuming LED bulbs as they fail in certain locations onboard the rig, running the optimal

Transocean 2026 APB-4 Proxy Statement

number of engines at the most efficient power loads, and strategic heading management (i.e., the orientation of the rig’s bow and stern) to reduce the impact of environmental conditions, such as tide and current, on the power needs of the rig’s thrusters. In addition, seven of our drillships have hybrid energy storage systems for enhanced drill floor equipment reliability, fuel and emissions savings, as well as advanced generator protection for power plant reliability.

We use technology to evaluate the energy efficiency of certain equipment as we work to reduce unnecessary power draws from equipment, and our operational guidelines are designed to optimize power demand.

We have undertaken an assessment of the potential resilience of the Company’s business to climate-related risks using three scenarios based upon the work of the International Energy Agency’s (IEA) 2023 World Energy Outlook and its extended data set, and the Intergovernmental Panel on Climate Change’s (IPCC) Sixth Assessment Report (AR6). This climate-related scenario analysis, together with our environmental management system and energy management processes, forms part of our due diligence with respect to climate-related risks and opportunities. The scenarios utilized in the assessment considered different global warming potentials – Net Zero (1.5°C), Announced Pledges (1.7-2°C), and Stated Policies (2.4-3°C) – and varied levels of physical and transition risks. Across scenarios, the Company’s strategy is resilient due to our expertise in drilling for traditional oil and gas resources and our investment in companies pursuing the development and exploration of deep-sea polymetallic nodules that contain metals critical to the growing renewable energy market. We consider potential climate-related financial risks and opportunities across a variety of topics, including weather changes and the impact on our business, shifts in regulations, technology development and implementation, investment availability, and shifts in demand. Climate-related risks are formally incorporated into the Company’s Enterprise Risk Management process, and we will periodically update and review them, as part of the above-mentioned process. We also share improvement opportunities with management.

In 2021, we conducted a sustainability-focused materiality assessment, which guided the creation of our previously announced sustainability goals. Since then, we have continued to track developments in the sustainability material topics that informed our goals, monitor our operations, and observed that the pace of technological advances associated with potential reductions in greenhouse gas emissions has been slower, and the costs have been greater, than anticipated. Particularly, in our engagements with shareholders and customers, we observed shifts in their approach to sustainability priorities. For these reasons, we suspended our previously announced sustainability goals, including our greenhouse emissions intensity reduction goal. While we do not have a specific emissions reduction target currently, we continue to monitor our performance, and we partner with customers and service providers, when possible, to make improvements aimed at reducing emissions. Based on our monitoring of fuel consumption, power use and offshore operating emissions intensity, we consider that these measures provide our framework for improving energy efficiency of our operations, while we continue to identify and pursue further opportunities for improvement. The assessment of the magnitude of any potential emissions reduction impact is dependent on a variety of factors, including the cyclical nature of our business, resource constraints, operating conditions, and our customers’ well programs, among others.

As part of this assessment, we are implementing or improving processes that measure (i) the fuel consumption of our drilling rigs, (ii) the power consumption of key pieces of equipment onboard our rigs, and (iii) our internal offshore operating emissions intensity, which we define as offshore operating emissions divided by rig operating days. This information is available from time to time to onshore and offshore rig leadership and is used to aid in decision-making onboard the rig.

Environmental risks are disclosed in our latest annual report on Form 10-K.

Loss of Containment

We define loss of containment as an unintended and uncontrolled release into the surrounding environment. We have implemented comprehensive policies and procedures in our EMS for strict compliance with all applicable requirements related to wastewater and other operational discharges.

Transocean 2026 APB-5 Proxy Statement

While customers design the well and determine the chemicals used in drilling operations, we have operational control over the fluids used for routine rig operations and maintenance. Loss of containment can arise from various factors, including operational integrity events, routine maintenance activities, and equipment failures. Preventing loss of containment involves proactive measures and best practices; for instance, loss of containment events are remediated in accordance with applicable law and recorded within the Company’s incident reporting system, and significant events are reviewed by management. Findings are communicated across the fleet as we attempt to improve future operational performance. Loss of containment incidents are reported by management to the GSE Committee.

We refer to process safety as operational integrity (“OI”), which is fundamental to the management of major hazards that may lead to low-frequency, high-consequence events; these events can result in impact to the environment, significant asset damage, or in the worst instance, loss of life. Since 2013, the Company has maintained a five-tier OI framework to categorize events based on potential impact to safety or the environment. The most impactful events are categorized as Tier 1 or Tier 2, which can occur when multiple operational barriers fail. Procedures governing OI are an integral part of our Company Management System (“CMS”), which puts effective processes in place.

Company management provides quarterly updates to the GSE Committee on the execution of our environmental practices and policies, assessing the sufficiency and efficacy of the CMS, reviewing performance, and identifying trends and areas for enhancement. For example, OI events are reviewed with the GSE Committee, and there were no Tier 1 or Tier 2 events recorded in 2025, continuing our strong performance from 2024 and 2023 when we also experienced no Tier 1 or Tier 2 events.

Under our environmental management system, we track and monitor our environmental performance using indicators such as the number and severity of OI events and loss of containment events, as well as fuel usage, which correlates to emissions.

Operational integrity is a key component of the Environmental & Safety Performance measure in the 2025 Cash Bonus Plan to reinforce the importance of delivering safe and reliable operations, both for those onboard our assets and for the ecosystems in which we operate. Please see the “Compensation Discussion and Analysis” section of our proxy statement for additional information.

Social Matters

The development of oil and gas resources in tandem with renewables and other energy alternatives – or the “energy expansion” – is critical to meeting increasing global energy demand. We are committed to delivering safe, efficient, reliable, and responsible operations. To that end, we prioritize recruitment and retention of skilled, qualified, and capable personnel and invest in the training and development of our teams. Further, we continue to fund innovation and technology programs with the potential to meaningfully enhance the value of our services through improvements to safety, equipment performance, and fuel efficiency.

Our approach to social matters is underpinned by our Health, Safety, Environment and Sustainability Policy Statement and our Company Management System, which together form an important part of our due diligence with respect to social and safety issues. Our Health, Safety, Environment and Sustainability Policy Statement is available on www.deepwater.com, and it sets forth our principles for how we work safely. This policy statement is overseen by the Board’s GSE Committee.

Our safety program focuses on three key components: personal safety, process safety, and occupational health. We conduct our business while prioritizing both the health and safety of our people and the integrity of our operations. Our safety vision is to conduct our operations in an incident-free workplace, all the time, everywhere. Underpinning this vision is our robust CMS, which details the policies and tools employed by our teams to complete their work safely, efficiently, and effectively. Our Company operates under an integrated management system that is certified ISO 45001.

Transocean 2026 APB-6 Proxy Statement

Compliance with all local regulations and a comprehensive set of internal policies and procedures governing our operations is required. We prioritize the protection of everyone onboard our rigs and in our facilities, the environment, and our property at all work locations. Incidents are reported and investigated to determine the root cause, with fleetwide communication of lessons learned. Potential areas of improvement are targeted with a topic-specific improvement program.

Transocean maintains a rigorous competency-based training program to provide our employees with the skills and tools needed to work safely. Our internal training board maintains and regularly updates our training matrix to meet or exceed industry standards, and it oversees our competency assurance management system, which is accredited by the OPITO. We provide various offshore training formats designed to address a variety of learning styles through on-the-job training, e-learning, customer-specific training, certifications, and leadership and licensing programs. We also offer simulation-based education, augmented by digital twin modeling, enabling our workforce to more accurately visualize equipment performance and target efficiencies. The certifications, skills and competencies needed for each role are communicated to the workforce, and workers are required to successfully complete the relevant training and attain necessary certifications prior to taking on new roles.

Our safety policies are implemented through a diverse range of programs, requirements, and tools. Through ongoing compliance assessments and audits, management monitors and verifies that work is executed following established policies and procedures. Findings are analyzed and shared across the fleet to bolster the Company’s safety performance and culture. Taken together, our safety policies, management systems, training programs and technology initiatives provide an effective framework for promoting safe operations and reducing workplace incidents, although we continue to focus on further improving our safety performance.

WorkSight, a digital assurance and verification application, is a key tool we use to cultivate safety performance and culture across our fleet. It is used to emphasize leading indicators of personal safety performance on our rigs. In WorkSight, rig teams identify potential hazards in their work and identify opportunities to eliminate or mitigate them, assess and challenge their behaviors, and seek areas for improvement. WorkSight leverages the expertise of our crews, frontline leaders, and senior rig leadership, along with data analytics and visualization, to influence behaviors and impact many aspects of our daily operations, thereby reinforcing process safety.

Central to our management of process safety is our Critical Operations Assurance center in Houston, Texas. This center remotely monitors key rig activities globally in real-time to verify the activities are executed in accordance with Company requirements to promote safe and consistent outcomes across the fleet.

We also invest in and deploy new technologies to enhance our operational performance and improve the safety of our operations, such as HaloGuard SM, the rotary multitool and the robotic riser system. HaloGuard SM is designed to alarm, notify and, if required, halt equipment to avoid injury to personnel working in the Red Zone, an area on the drill floor featuring elevated risk due to the presence of mobile heavy machinery. Transocean co-developed a rotary multitool to reduce manual tasks and enhance safety on the drill floor; it is currently installed on two rigs in our fleet, the Transocean Enabler and the Transocean Norge. This robotic riser system eliminates the need for personnel to be in the Red Zone during riser handling operations, which are among the most physically taxing and hazardous activities offshore. It is now deployed on four rigs in our fleet. We continue to engage with our customers regarding additional installations of these and other products to further enhance operational safety.

The combined focus on personal safety, occupational safety and process safety enables Transocean to protect people, the environments in which we work, and our assets, while conducting our work efficiently and effectively. Job roles are evaluated to identify any associated potential hazards to implement effective processes and standards to mitigate risks and support the well-being of employees while on the job. We maintain strict requirements around personal protective equipment, task design, procedures, and equipment selection and maintenance to reduce risk and maintain a healthy environment. All rigs are staffed with a medical professional, equipped with an onboard clinic bolstered by 24/7 shore-based medical support and overseen by our Company medical director, a licensed physician.

Transocean 2026 APB-7 Proxy Statement

We measure our safety performance in terms of widely accepted ratios with the use of industry standards, including (a) Total Recordable Incident Rate (“TRIR”), which represents the number of recordable work-related injuries or illnesses for every 200,000 hours worked and (b) Lost Time Incident Rate (“LTIR”), which measures the number of incidents that result in lost time due to work-related injuries or illnesses for every 200,000 hours worked. In the year ended December 31, 2025, our TRIR was 0.19, a slight increase over our 2024 performance of 0.15. None of the incidents recorded in 2024 or 2025 resulted in life-changing injuries. Our LTIR was 0.00 in 2025, consistent with our excellent performance in 2024. The calculations of TRIR and LTIR were based on 11.5 million labor hours and 11.7 million labor hours in 2025 and 2024, respectively.

We measure the reliability and efficiency of our operations using uptime. Uptime is measured as total operating hours, minus downtime hours, expressed as a percentage of the maximum total operating hours. Operating hours are defined as the number of hours a rig is operating under a contract. Downtime is defined as the number of hours the rig is not engaged in drilling activities, resulting from Company mechanical failure or human performance error. In the year ended December 31, 2025, uptime was 97.7%, a Company record, and an improvement from 96.9% uptime performance in 2024.

Personal Safety is a key component of the Environmental & Safety Performance measure in the 2025 Cash Bonus Plan to reinforce the importance of delivering safe and reliable operations. Please see the “Compensation Discussion and Analysis” section of our proxy statement for additional information on the TRIR and uptime measures.

Employee Matters

As of December 31, 2025, we had a global workforce of approximately 5,600 individuals, including approximately 380 contractors, representing 67 nationalities. As of December 31, 2025, our global workforce was geographically distributed in 20 countries across six continents as follows: 38 percent in North America, 26 percent in South America, 23 percent in Europe, six percent in Australia, four percent in Africa, and three percent in Asia.

Transocean prioritizes the well-being of its employees from physical and financial health to emotional and social health. These four pillars guide our approach to employee benefits to help our team succeed professionally and personally. We work to attract, develop and retain a skilled workforce and to promote the well-being of our employees. We apply due diligence to employee matters through our global and regional human resources policies, our compensation and benefits frameworks and our competency-based training and development processes.

We endeavor to provide those who work at Transocean with a safe and respectful environment. We periodically assess our workplace and adapt our practices and policies to make sure our approach reflects contemporary norms and meets the needs and expectations of current and future talent. Our aim is to recruit, develop, and retain the best workforce in the offshore drilling industry. We value the varied skills, knowledge, expertise, perspectives, and backgrounds of our workforce, which enable the Company to navigate both the global and regional nuances of the offshore drilling business. As a company with customers, offices, and assets all over the world, we view our international workforce as a key factor in our success.

Due to the nature of our business and the many countries in which we operate, we offer regionally competitive benefits and adhere to internal global practices with the goal to meet or exceed local market standards.

Physical**.** Our physical-wellness benefits program emphasizes promoting a healthy lifestyle through educational initiatives, preventive-care measures, and convenient access to medical advice and resources.

Financial. We offer our employees regionally competitive compensation and benefits packages that meet all regulatory requirements. In addition to providing competitive remuneration, we understand the importance of helping employees prepare for their future financial well-being, and we provide resources and guidance to assist our team in setting and achieving their financial goals. Offerings vary regionally and may include retirement savings programs, discount programs and personal meetings with financial advisors.

Transocean 2026 APB-8 Proxy Statement

Emotional. We recognize the significance of emotional well-being, and we provide programs that support the emotional health of employees and their families. Offerings can vary regionally and may include programs such as Employee Assistance Programs and psychiatric care.

Social. Our social well-being strategy places a significant emphasis on the communities where we operate. As global corporate citizens, we embrace our responsibility to make positive contributions through financial support and volunteerism. Community initiatives and partnerships focus on areas such as education, health and well-being, and environmental conservation and restoration.

We continually assess and provide social and technological resources designed to improve the work environment. In addition, we create and enforce a respectful and inclusive work environment in which our global workforce can thrive. These measures, together with our focus on competitive compensation and benefits, development opportunities and a respectful culture, provide an effective framework for supporting employee well - being and engagement.

We aim to strategically cultivate a best-in-class workforce to offer the innovation, local knowledge and experience required of the world’s premier offshore drilling contractor. Our focus on the quality of our workforce is designed to maximize the quality of our work performance, and ultimately, the value we deliver.

We invest in our workers by providing them with the transferable skill sets essential to advancing their professional development. To optimize the competitive position of our business, we maintain a competency-based training program as described in Social Matters.

As a business in the energy industry, we must operate with integrity, discipline and unconditional respect for our people, our communities and our environment. Our functional leadership teams work together to manage and execute our sustainability program, including investments in:

We monitor employee-related matters using indicators such as workforce size and composition (including the number of employees and contractors, nationalities and geographic distribution described above), training and development activity under our competency-based training program and internal measures of employee engagement and well-being.

Additionally, we embrace our role as a global corporate citizen, and we aim to positively impact communities where we live and operate. Our support focuses on education, health and well-being and environmental conservation and restoration. Some examples of the community organizations with which we have partnered, include Galveston Bay Foundation, Houston Food Bank, Udaan Foundation (India), Texas Children’s Hospital Heart Center (Global Programs), and Dress for Success Houston.

Transocean 2026 APB-9 Proxy Statement

Human Rights Matters

As a global company, we view it as our obligation to uphold human rights throughout all operations, regardless of whether those rights are protected by local laws. We work hard to make sure our business operations do not cause or contribute to (directly or indirectly) adverse impacts on human rights. We demonstrate our respect for human rights by maintaining a healthy and safe work environment, observing fair employment practices, and providing competitive employment terms. Practices such as modern slavery, child labor, forced or indentured servitude, and other human rights abuses, are strictly prohibited.

Our commitment to respect human rights is set out in our Code of Integrity and Human Rights Policy Statement, and we apply due diligence to human rights matters through the policies, screening, assessment and reporting processes described in this section. The Code of Integrity and Human Rights Policy Statement are available on www.deepwater.com.

Transocean's Code of Integrity and Human Rights Policy Statement apply to all members of our Board, executives, employees, and business partners, which include contractors, suppliers, vendors, and joint venture partners. The Code outlines our company’s ethical values and sets out the minimum behaviors we expect from our team and how to report concerns. The Human Rights Policy Statement explains how the Company approaches Human Rights topics in its direct business operations and in the supply chain to maintain an organizational culture that supports the protection of human rights and takes reasonable measures to avoid contributing to adverse human rights impacts. Both the Code of Integrity and Human Rights Policy Statement are available on the Company website. Together, these documents, and the processes described below, form the core of our due diligence approach to human rights.

In our Business Operations. We expect Transocean employees and representatives to act lawfully and respectfully toward those we conduct business with and toward parties in the local communities in which we operate. These expectations are outlined in our Code of Integrity, as well as various enterprise-wide policies. We ensure the protection of Transocean employee rights through policies and procedures established by the Human Resources, Health, Safety & Environment, and Legal departments.

Throughout our Supply Chain. We expect our business partners, including our suppliers, to share our commitment to respect human rights. Suppliers must comply with our Code of Integrity, which specifically outlines our expectations related to human rights. Suppliers must also comply with our standard contract provisions, which require strict adherence to all applicable laws, including human rights laws.

To manage the Company’s human rights risk, we select our suppliers and business partners carefully, and we require them to manage their own suppliers and business partners with the same care. Before engaging in a business relationship with a supplier, we conduct background screenings and contractually obligate suppliers to comply with (a) all applicable laws, which include those pertaining to human rights or modern slavery; (b) our Code of Integrity, which outlines the expectations of supplier conduct and imposes an obligation to report any conduct that does not meet those expectations; (c) human rights review exercises conducted by us or a third party that we appoint to make sure they are meeting those obligations, for key suppliers; and (d) our standard that our suppliers impose the same human rights obligations on their suppliers. Throughout the business relationship, we periodically engage with suppliers to reinforce Company expectations, monitor their performance via tools like restricted party screening, and formal and informal site visits, and conduct human rights reviews pursuant to a risk-based plan.

Periodically, Transocean conducts a Human Rights Risk Identification and Assessment exercise to identify, evaluate, and monitor potential risks of adverse impacts on human rights and decent working conditions. We consider a variety of factors in assessing the Company’s risk of causing, contributing to, or otherwise being linked to, actual and potential adverse impacts on human rights and decent working conditions, including scale, scope, and remediation. None of the human rights assessments conducted in 2025 yielded any evidence of violations of Transocean standards or applicable law.

Transocean 2026 APB-10 Proxy Statement

Our Speak Up Culture is designed to encourage our workforce and business partners to report any concerns. In instances where someone has a concern or believes that there has or may have been a violation of our human rights policies or any other policies, the individual is encouraged to report any concerns to a manager, Human Resources, or through the HelpLine. To ensure consistency around how reports are managed and investigated, the Human Resources and Legal Compliance and Ethics (“LCE”) functions follow investigation policies and procedures. Transocean adheres to a strict non-retaliation policy for concerns raised in good faith.

Because Transocean’s operations are mostly comprised of employees and contractors performing highly technical services in an industry with tightly controlled regulatory environments, the Company’s overall human rights risk can be characterized as relatively low. In our own operations, human rights risks relate primarily to working conditions, health and safety. In our supply chain and other business relationships, we may be exposed to risks such as non-compliance with labor standards, inadequate working conditions or other human rights concerns at third parties. In 2025, Transocean did not identify any actual adverse impacts on human rights or decent working conditions in its operations, supply chain, or business relationships. Continuous focus on identifying these areas helps us prioritize how we address and prevent adverse human rights impacts across operations and extended supply chain.

Continuous focus on identifying these areas helps us prioritize how we address and prevent adverse human rights impacts across operations and extended supply chain. Further, employees are required to complete our Code of Integrity training (“LCE training”) on an annual basis, which covers varying topics from year to year, including human rights. Additionally, to make sure we are aware of, and can adequately address, any actual or suspected human rights violations, Transocean provides a 24-hour, third-party managed HelpLine, accessible atwww.transocean.ethicspoint.com, where individuals can raise concerns in good faith without the fear of retaliation. HelpLine reports can be made anonymously, at any time, by anyone, and by phone or the web.

We periodically incorporate a Human Rights module into our LCE training to strengthen every employee’s, including management’s understanding of human rights protections, including taking all reasonable measures to avoid contributing to adverse human rights impacts, and how to identify and report potential issues.

These measures, together with our screening, assessment and reporting practices described above, provide an effective framework to prevent, mitigate, identify and address potential human rights issues in our operations, supply chain and other business relationships. We monitor the operation of this framework using indicators such as the number and nature of human rights-related concerns reported through our channels and the outcome of human rights risk assessments and supplier reviews, where applicable. In 2025, none of the human rights assessments conducted and none of the concerns reported through our channels resulted in the identification of an actual adverse impact on human rights or decent working conditions.

Anti-Corruption Matters

Earning and maintaining trust requires a commitment to integrity in every aspect of our business, from how we obtain business opportunities to compliance with the most technical of laws. We always endeavor to conduct business fairly and transparently. It is what Transocean is known for, and what is expected from the world’s leading offshore drilling provider. The Company is committed to complying with applicable anti-bribery and anti-corruption laws, and our Code of Integrity and Anti-Corruption and Business Conduct Standard strictly prohibit bribery and improper payments. Our ethics and compliance framework and third-party due diligence processes form an important part of our due diligence with respect to corruption risks.

Our approach to ethics and compliance is grounded in a risk-based methodology aligned with the expectations of effective compliance programs enumerated by various regulators, including the U.S. Department of Justice and the U.S. Securities and Exchange Commission. Accordingly, we conduct annual risk assessments, establish and enforce policies and procedures related to, among others, antibribery and anticorruption, gifts, meals and entertainment, and financial controls, provide associated training and communication, perform auditing and monitoring activities, and conduct investigations, where necessary. Together, these elements serve as the foundation of our LCE program. At Transocean, we know that everyone, whether they work for or on behalf of the Company, is responsible for ethics and compliance. The Company conducts annual LCE

Transocean 2026 APB-11 Proxy Statement

training on relevant topics, as well as periodic training tailored to specific audiences, delivered through a variety of in-person and digital formats. It is crucial for us to seamlessly integrate our LCE program into our business processes, making sure it is relevant and aligns with our operations. We collaborate across the Company to identify ethics and compliance risks and make sure they are appropriately addressed and mitigated. Transocean’s Code of Integrity Committee holds quarterly meetings with key management personnel, fostering discussions on the integration of LCE program controls and initiatives into our business operations and project execution. These meetings also serve as a platform to identify areas for improvement.

The Code of Integrity applies to all individuals working for, or on behalf of Transocean, including Board members, executives, employees, and business partners. We require third parties we work with to understand, adhere to, and periodically certify compliance with the Code of Integrity, which includes compliance with all applicable laws. In situations where the Code of Integrity may conflict with local customs or laws, we follow the more stringent standard. To promote an ethical business culture and underscore the importance of complying with all applicable laws and Company policies, we provide training focused on our Code of Integrity and other relevant compliance topics.

Transocean’s Anti-Corruption and Business Conduct Standard strictly prohibits making, offering, receiving, or agreeing to receive bribes of any kind. A bribe is made when anything of value, financial or otherwise, is offered to gain or retain an improper business advantage, even if the advantage is ultimately not received. Bribes erode the rule of law, hurt communities, harm reputations, and expose companies and individuals to criminal liability.

Transocean has implemented measures to prevent and detect potential bribes, and our most important tool will always be the vigilance of our employees and business partners in identifying and reporting any instances or suspicions of impropriety. We believe that these measures, taken together, provide an effective framework for preventing and detecting bribery and corruption.

In addition to the diligence measures described in the Human Rights Matters section above, when we engage with third-party intermediaries (“TPIs”), a subset of suppliers that interact with government officials on our behalf, we take the supplier evaluation and review process a step further. We subject TPIs to a stringent vetting, training, and monitoring process at the time of onboarding and throughout their business relationship with the Company. Our internal TPI Oversight Committee oversees this process and regularly meets throughout the year. Also, the Board has a well-defined policy regarding related party transactions, which entails a thorough recurring review, approval, or ratification process. The responsibility for reviewing, approving, and/or ratifying any related party transaction lies with the Audit Committee, supported by the Company’s Chief Legal Officer. It is mandatory for directors and executive officers to disclose in a timely manner any transactions in which they, their immediate family members, or other related persons have an interest. This transparent approach provides for proper oversight and safeguards against any potential conflicts of interest.

Our activities expose us to corruption risks in certain jurisdictions and in interactions with government officials and commercial counterparties, particularly where we rely on third-party intermediaries for business development or operational support. We mitigate these risks through our risk-based compliance program, including due diligence on TPIs and higher-risk counterparties, contractual safeguards, training and ongoing monitoring, and by promoting a culture of integrity and speaking up.

Transocean also encourages employees and those we work with to report any concerns they may have, including potential violations of our Code of Integrity. Through the HelpLine, a third-party managed service available 24/7 on a global scale, we provide a reporting channel, where concerns may be reported anonymously. Upholding our commitment to protect those who make reports in good faith, we strictly enforce a zero-tolerance policy against any form of retaliation. We take Code of Integrity violations seriously and allocate all necessary resources to conduct fair and thorough investigations. All investigations are conducted with confidentiality, in accordance with legal requirements. To the extent possible, confidentiality is maintained throughout the entire investigation process, from the initial reporting to the final resolution.

All HelpLine reports regarding alleged Code of Integrity violations are diligently reviewed and investigated, and LCE presents regular updates to the Audit Committee of the Board of Directors.

Transocean 2026 APB-12 Proxy Statement

Transocean maintains a risk-based monitoring and response program designed to detect inconsistencies in control execution and to support the continuous improvement of the LCE program. Transocean also regularly reviews its policies and systematic controls to identify potential control enhancements. We actively seek feedback from our workforce regarding our program initiatives, utilizing employees’ input to enhance policies and procedures for maximum effectiveness. Using reporting information and data analytics derived from our annual LCE training allows us to measure the effectiveness of initiatives and tailor the program to address, in real-time, the needs of our people, customers and business.

In 2025, the Company's annual LCE training was assigned to 5,100 onshore and offshore personnel. The training was made available in English, Brazilian Portuguese, and Norwegian, and covered anti-corruption; gifts, meals, and entertainment; conflicts of interest; and respectful workplace behavior. The completion rate for the 2025 LCE training campaign was 99%.

The Company also rolled out the 2025 LCE Third-Party Training to certain of the Company’s TPIs and other business partners. While TPIs are required to complete the Company’s online training at onboarding and recertification, the annual LCE Third-Party Training is an additional requirement for those TPIs identified as higher-risk through LCE’s risk-based methodology.

We monitor the effectiveness of our anti-corruption program using indicators such as completion rates and performance analytics for Code of Integrity and anti-corruption training, the number and outcome of investigations relating to potential integrity or compliance violations and the results of TPI due diligence and monitoring activities.

Transocean 2026 APB-13 Proxy Statement

FORWARD LOOKING STATEMENTS

The statements described herein that are not historical facts are forward-looking statements within the meaning of Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934, as amended. These statements could contain words such as “possible,” “intend,” “will,” “if,” “expect,” or other similar expressions.

Forward-looking statements are based on management’s current expectations and assumptions and are subject to inherent uncertainties, risks and changes in circumstances that are difficult to predict. As a result, actual results could differ materially from those indicated in these forward-looking statements. Factors that could cause actual results to differ materially include, but are not limited to, estimated duration of customer contracts, contract dayrate amounts, future contract commencement dates and locations, planned shipyard projects and other out- of-service time, sales of drilling units, timing of the Company’s newbuild deliveries, operating hazards and delays, risks associated with international operations, actions by customers and other third parties, the fluctuation of current and future prices of oil and gas, the global and regional supply and demand for oil and gas, the intention to scrap certain drilling rigs, the success of our business following prior acquisitions, the effects of the spread of and mitigation efforts by governments, businesses and individuals related to contagious illnesses and other factors, including those and other risks discussed in the Company’s most recent annual report on Form 10-K for the year ended December 31, 2025, and in the Company’s other filings with the U.S. Securities and Exchange Commission (“SEC”), which are available free of charge on the SEC’s website atwww.sec.gov.

Should one or more of these risks or uncertainties materialize (or the other consequences of such a development worsen), or should underlying assumptions prove incorrect, actual results may vary materially from those indicated or expressed or implied by such forward-looking statements. All subsequent written and oral forward-looking statements attributable to the Company or to persons acting on our behalf are expressly qualified in their entirety by reference to these risks and uncertainties. You should not place undue reliance on forward-looking statements, each of which speaks only as of the date of the particular statement. We expressly disclaim any obligations or undertaking to release publicly any updates or revisions to any forward-looking statement to reflect any change in our expectations or beliefs with regard to the statement or any changes in events, conditions or circumstances on which any forward-looking statement is based, except as required by law. All non-GAAP financial measure reconciliations to the most comparative GAAP measure are displayed in quantitative schedules on the Company’s website at www.deepwater.com.

This report, or referenced documents, do not constitute an offer to sell, or a solicitation of an offer to buy, any securities, and do not constitute an offering prospectus within the meaning of the Swiss Financial Services Act (FinSA) or advertising within the meaning of the FinSA. Investors must rely on their own evaluation of Transocean and its securities, including the merits and risks involved. Nothing contained herein is, or shall be relied on as, a promise or representation as to the future performance of Transocean.

Information contained on or accessible from our website is not incorporated by reference into this Report and should not be considered a part of this Report or any other filing that we make with the SEC. References to website URLs are intended to be inactive textual references only.

Transocean 2026 APB-14 Proxy Statement