As filed with the Securities and Exchange Commission on June 28, 2024

Registration No. 333-

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM S-3

REGISTRATION STATEMENT

UNDER THE SECURITIES ACT OF 1933

TRANSOCEAN LTD.

(Exact name of registrant as specified in its charter)

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Turmstrasse 30

6312 Steinhausen, Switzerland

+41 (41) 749-0500

(Address, including zip code, and telephone number, including area code, of registrant’s principal executive offices)

Brady K. Long

Executive Vice President and General Counsel

Transocean Ltd.

c/o Transocean Offshore Deepwater Drilling Inc.

1414 Enclave Parkway

Houston, Texas 77077

+1 (713) 232-7500

(Name, address, including zip code, and telephone number, including area code, of agent for service)

Copies to:

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Approximate date of commencement of proposed sale to the public:  From time to time after the effective date of this registration statement.

If the only securities being registered on this Form are being offered pursuant to dividend or interest reinvestment plans, please check the following box.  ☐

If any of the securities being registered on this Form are to be offered on a delayed or continuous basis pursuant to Rule 415 under the Securities Act of 1933, other than securities offered only in connection with dividend or interest reinvestment plans, check the following box.  ☒

If this Form is filed to register additional securities for an offering pursuant to Rule 462(b) under the Securities Act, please check the following box and list the Securities Act registration statement number of the earlier effective registration statement for the same offering.  ☐

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If this Form is a post-effective amendment filed pursuant to Rule 462(c) under the Securities Act, check the following box and list the Securities Act registration statement number of the earlier effective registration statement for the same offering.  ☐

If this Form is a registration statement pursuant to General Instruction I.D. or a post-effective amendment thereto that shall become effective upon filing with the Commission pursuant to Rule 462(e) under the Securities Act, check the following box.  ☒

If this Form is a post-effective amendment to a registration statement filed pursuant to General Instruction I.D. filed to register additional securities or additional classes of securities pursuant to Rule 413(b) under the Securities Act, check the following box.  ☐

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company, or an emerging growth company.  See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and “emerging growth company” in Rule 12b-2 of the Exchange Act of 1934.

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If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 7(a)(2)(B) of the Securities Act.  ☐

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PROSPECTUS

Transocean Ltd.

55,513,043 Shares

The selling securityholders identified in this prospectus may offer and sell, from time to time, in one or more offerings, shares, par value USD 0.10 per share, of Transocean Ltd. The shares that may be sold pursuant to this prospectus include shares held by the selling securityholders.  The selling securityholders may offer and sell such shares, from time to time, in one or more offerings, at prices and on terms that will be determined at the time of the offering.  The selling securityholders may offer and sell the shares described in this prospectus and any applicable prospectus supplement directly to purchasers or through underwriters, broker-dealers or agents, in public or private transactions, at prevailing market prices or at privately negotiated prices, including in satisfaction of certain contractual obligations.  The timing and amount of any sale is within the sole discretion of the selling securityholders, subject to certain restrictions.  See “Plan of Distribution” for additional information.

You should carefully read this prospectus and any applicable prospectus supplement and free writing prospectus, together with the documents we incorporate by reference, before you invest in our shares.

This prospectus relates solely to sales of shares by the selling securityholders.  We are not selling any shares under this prospectus and will not receive any proceeds from the sale of shares by the selling securityholders.  The shares are traded on the New York Stock Exchange under the trading symbol “RIG”.

INVESTING IN OUR SHARES INVOLVES RISKS.  SEE “RISK FACTORS” ON PAGE  1 OF THIS PROSPECTUS AND ANY SIMILAR SECTION CONTAINED IN THE APPLICABLE PROSPECTUS SUPPLEMENT AND THE DOCUMENTS THAT ARE INCORPORATED BY REFERENCE INTO THIS PROSPECTUS FOR FACTORS YOU SHOULD CONSIDER BEFORE INVESTING IN OUR SHARES.

Neither the Securities and Exchange Commission nor any state securities commission has approved or disapproved of these securities or determined whether this prospectus is truthful or complete.  Any representation to the contrary is a criminal offense.

The date of this prospectus is June 28, 2024.

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TABLE OF CONTENTS

ABOUT THIS PROSPECTUS‌ii

FORWARD-LOOKING INFORMATION‌iii

THE COMPANY‌1

RISK FACTORS‌1

ENFORCEABILITY OF CIVIL LIABILITIES AGAINST FOREIGN PERSONS‌1

WHERE YOU CAN FIND MORE INFORMATION‌2

INCORPORATION BY REFERENCE‌2

USE OF PROCEEDS‌3

SUMMARY OF THE TRANSACTION‌3

DESCRIPTION OF TRANSOCEAN LTD. SHARES‌3

SELLING SECURITYHOLDERS‌14

PLAN OF DISTRIBUTION‌15

MATERIAL TAX CONSEQUENCES‌18

LEGAL MATTERS‌26

EXPERTS‌26

SIGNATURES‌31

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ABOUT THIS PROSPECTUS

This prospectus is part of a registration statement that we filed with the U.S. Securities and Exchange Commission (the “SEC”), as a “well-known seasoned issuer” as defined in Rule 405 under the Securities Act of 1933, as amended (the “Securities Act”), using a “shelf” registration process.  By using a shelf registration statement, the selling securityholders may sell securities from time to time and in one or more offerings.  Any prospectus supplement or free writing prospectus that we file in connection with any specific offering by the selling securityholders may add, update or change information contained in this prospectus.  If there is any inconsistency between the information in this prospectus and any applicable prospectus supplement or free writing prospectus, you should rely on the prospectus supplement or free writing prospectus, as applicable.  Before purchasing any securities, you should read this prospectus, any applicable prospectus supplement and any applicable free writing prospectus, together with the additional information described under the heading “Where You Can Find More Information.”

You should rely only on the information contained in or incorporated by reference into this prospectus, any applicable prospectus supplement and any applicable free writing prospectus.  Neither we nor the selling securityholders have authorized anyone to provide you with any information or to make any representations other than those contained in this prospectus, any applicable prospectus supplement or any applicable free writing prospectus prepared by or on behalf of us or to which we have referred you.  You should assume that the information appearing in this prospectus, any prospectus supplement or any applicable free writing prospectus is accurate only as of the date on its respective cover page (or if applicable, the date set forth in such information) and that any information incorporated by reference into any of the foregoing is accurate only as of the date of such document incorporated by reference (or if applicable, the date set forth in such information).  Our business, financial condition, results of operations and prospects may have changed since those dates.

In this prospectus, references to “USD,” “dollars” and “$” are to United States currency, and the terms “United States” and “U.S.” mean the United States of America, its states, its territories, its possessions and all areas subject to its jurisdiction.  

We and the selling securityholders are not making an offer to sell securities in any jurisdiction where the offer or sale of such securities is not permitted.

References in this prospectus to “Transocean,” “we,” “our,” “us” and similar terms mean Transocean Ltd. and its subsidiaries unless indicated otherwise.

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FORWARD-LOOKING INFORMATION

The statements included in this prospectus regarding future financial performance and results of operations and other statements that are not historical facts are forward-looking statements within the meaning of Section 27A of the Securities Act and Section 21E of the Securities Exchange Act of 1934, as amended (the “Exchange Act”).

Forward-looking statements in this prospectus are identifiable by use of the following words and other similar expressions:

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Such statements are subject to numerous risks, uncertainties and assumptions, including, but not limited to:

The foregoing risks and uncertainties are beyond our ability to control, and in many cases, we cannot predict the risks and uncertainties that could cause our actual results to differ materially from those indicated by the forward-looking statements.  Should one or more of these risks or uncertainties materialize, or should underlying assumptions prove incorrect, actual results may vary materially from those indicated.  All subsequent written and oral forward-looking statements attributable to us 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 forward-looking statement speaks only as of the date of the particular statement.  We expressly disclaim any obligation or undertaking to release publicly any updates or revisions to any forward-looking statement to reflect any change in

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our expectations or beliefs with regard to the statement or any change in events, conditions or circumstances on which any forward-looking statement is based, except as required by law.

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THE COMPANY

Transocean Ltd. is a leading international provider of offshore contract drilling services for oil and gas wells.  As of June 28, 2024, we owned or had partial ownership interests in and operated 36 mobile offshore drilling units, consisting of 28 ultra-deepwater floaters and eight 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 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.

We perform contract drilling services by deploying our high-specification fleet in a single, global market that is geographically dispersed in oil and gas exploration and development areas throughout the world.  Although rigs can be moved from one region to another, the cost of moving rigs and the availability of rig-moving vessels may cause the supply and demand balance to fluctuate somewhat between regions.  Still, significant variations between regions do not tend to persist long term because of rig mobility.  The location of our rigs and the allocation of resources to operate, build or upgrade our rigs are determined by the activities and needs of our customers.

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.  Transocean Ltd.’s telephone number at that address is +41 (41) 749 0500. Shares of Transocean Ltd.’s common stock are listed on the NYSE under the symbol “RIG.”

RISK FACTORS

An investment in the shares involve risks.  You should carefully consider the risks related to the shares described in the risk factors included in our Annual Report on Form 10-K for the fiscal year ended December 31, 2023, our Quarterly Report on Form 10-Q for the three months ended March 31, 2024, and any documents subsequently filed by us and incorporated by reference in this prospectus, as well as the other information included or incorporated by reference in this prospectus, before making an investment decision.  Our business, financial condition or results of operations could be materially adversely affected by any of these risks or by risks not currently known to us or risks we do not currently consider to be material.  This prospectus also contains forward-looking statements that involve risks and uncertainties.  Our actual results could differ materially from those anticipated in these forward-looking statements as a result of certain factors.  See “Forward-Looking Information” and “Where You Can Find More Information”.

ENFORCEABILITY OF CIVIL LIABILITIES AGAINST FOREIGN PERSONS

Transocean Ltd. is a Swiss corporation.  Certain of our officers and directors may be residents of various jurisdictions outside the United States.  All or a substantial portion of our assets and the assets of these persons may be located outside the United States.  As a result, it may be difficult for investors to effect service of process within the United States upon us or these persons or to enforce any U.S. court judgment obtained against us or these persons, including judgments in actions predicated upon the civil liability provisions of U.S. federal securities laws.  We have agreed to be served with process with respect to actions based on offers and sales of our securities.  To bring a claim against us, you may serve our Corporate Secretary, c/o Transocean Offshore Deepwater Drilling Inc., 1414 Enclave Parkway, Houston, Texas 77077, the U.S. agent appointed for such purpose.

Homburger AG, our Swiss legal counsel, has advised us that it is uncertain that Swiss courts would enforce (1) judgments of U.S. courts obtained in actions against Transocean Ltd. or other persons that are predicated upon the civil liability provisions of U.S. federal securities laws or (2) original actions brought against Transocean Ltd. or other persons predicated upon the Securities Act.  The enforceability in Switzerland of a foreign judgment rendered against Transocean Ltd. or such other persons is subject to the limitations set forth in such international treaties by which Switzerland is bound and the Swiss Federal Private International Law Act.  In particular, and without limitation to the foregoing, a judgment rendered by a foreign court may only be enforced in Switzerland if:

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In addition, enforceability of a judgment by a non-Swiss court in Switzerland may be limited if we can demonstrate that it or such other persons were not effectively served with process.

WHERE YOU CAN FIND MORE INFORMATION

We file annual, quarterly and current reports, proxy statements and other information with the SEC.  The SEC maintains a website at www.sec.gov where you can access reports, proxy information and registration statements, and other information regarding issuers that file electronically.  The shares are listed on the New York Stock Exchange (the “NYSE”) under the symbol “RIG.” We also maintain an Internet website at www.deepwater.com, which provides additional information about us through which you can also access our SEC filings.  Except for the documents incorporated by reference into this prospectus as described under the heading “Incorporation by Reference,” the information and other content contained on our website or the SEC’s website are not incorporated by reference into, and do not constitute part of, this prospectus and should not be relied upon in connection with making any investment in our shares.

This prospectus is part of a registration statement on Form S-3 that we filed with the SEC.  This prospectus does not contain all of the information set forth in the registration statement and the exhibits thereto.  You may obtain the full registration statement from the SEC or us (as described below).  Forms of the documents establishing certain of the terms of the offered securities are or may be filed as exhibits to the registration statement or documents incorporated by reference in the registration statement.  Statements in this prospectus, any applicable prospectus supplement or any applicable free writing prospectus are qualified in all respects by reference to the documents to which they refer.  You should refer to the actual documents for a more complete description of the relevant matters.

INCORPORATION BY REFERENCE

The SEC allows us to “incorporate by reference” the information we have filed with it, which means that we can disclose important information to you by referring you to those documents filed separately with the SEC.  The information incorporated by reference is deemed to be part of this prospectus, and subsequent information that we file with the SEC will automatically update and supersede that information.  We have incorporated by reference the documents listed below and any future filings we make with the SEC under Sections 13(a), 13(c), 14 or 15(d) of the Exchange Act (other than information “furnished” and not “filed” with the SEC, unless we specifically provide that such “furnished” information is to be incorporated by reference) until the offering of the shares covered by this prospectus has been completed. The documents we incorporate by reference are:

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Any statement contained in a document incorporated by reference in this prospectus shall be deemed to be modified or superseded for purposes of this prospectus to the extent that a statement contained herein or in any other subsequently filed document that also is incorporated by reference in this prospectus modifies or supersedes such statement.  Any statement so modified or superseded shall not be deemed, except as so modified or superseded, to constitute a part of this prospectus or any prospectus supplement.

A copy of these filings will be provided upon oral or written request, other than an exhibit to these filings unless we have specifically incorporated that exhibit by reference into the filing, at no cost.  You may request such copies by writing or calling:

Transocean Ltd.

c/o Transocean Offshore Deepwater Drilling Inc.

1414 Enclave Parkway

Houston, Texas 77077

Attn:  Investor Relations

+1 (713) 232-7500

USE OF PROCEEDS

All shares sold pursuant to this prospectus will be sold by the selling securityholders.  We will not receive any proceeds from the sale of shares by the selling securityholders.  Additional information relating thereto may be set forth in any applicable prospectus supplement.

SUMMARY OF THE TRANSACTION

On June 28, 2024, Transocean Ltd. and certain subsidiaries of Transocean Ltd. entered into a share purchase agreement (the “SPA”) with certain funds managed and/or advised by Hayfin Capital Management LLP and/or its affiliates (together, “Hayfin”), pursuant to which Transocean Ltd. agreed to cause to be issued (i) 55,513,043 shares, USD 0.10 par value each, of Transocean Ltd. (such shares, referred to as “registrable securities”) and (ii) $130 million aggregate principal amount of our 8.00% Senior Notes due 2027, as “Additional Securities” pursuant to our indenture dated January 17, 2020 (such notes, referred to as the “notes”), to Hayfin in exchange for the acquisition by Transocean of Hayfin’s 67.0% ownership interest in the joint venture (the “Joint Venture”) that owns the Transocean Norge. The transactions contemplated by the aforementioned share purchase agreement were consummated on June 28, 2024, including the issuance of the registrable securities and the notes to Hayfin, and we have agreed that we will file a registration statement registering the resale of all of the registrable securities (but not the notes).  This registration statement is being filed to satisfy this obligation.  

The registration rights described above will terminate when the selling securityholders no longer beneficially own any registrable securities or when all registrable securities owned by all of the selling securityholders may be freely resold pursuant to Rule 144 promulgated under the Securities Act without regard to any limitations thereunder.

This prospectus is not an offer to sell or a solicitation of an offer to buy the notes. The SPA and related transactions are further described in our current report on Form 8-K, filed with the SEC on June 28, 2024.

DESCRIPTION OF TRANSOCEAN LTD. SHARES

The following description of the share capital of Transocean Ltd. is a summary.  This summary is subject to the complete text of our articles of association, as amended, which are incorporated by reference into the registration statement of which this prospectus forms a part.  We encourage you to read the articles of association carefully.  In this section, references to “Transocean”, “we,” “our,” and “us” mean Transocean Ltd.

General

Issued Share Capital.  As of June 28, 2024, the share capital of Transocean registered shares in the commercial register, which reflects Transocean’s total issued share capital, was USD 94,082,890.10, divided into 940,828,901 registered shares, par value USD 0.10 per share. The issued Transocean shares are fully paid, non-assessable, and rank pari passu with each other and all other Transocean shares.

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Capital Band (Capital Authorization).  Article 5 of our articles of association provides for a general capital band ranging from USD 86,281,585.80 (lower limit) to USD 105,787,902.90 (upper limit), which may be used by our board of directors to issue new Transocean shares for (a) general purposes or (b) incentive plans.

General Authorization.  Article 5 of our articles of association provides for a capital band that authorizes our board of directors to issue up to 172,563,171 new fully paid-in Transocean shares for general corporate purposes at any time until May 29, 2025, and thereby increase the stated share capital from time to time. A capital increase may further be effected within the range of the capital band by way of an increase of the par value of the Transocean shares (but in any event, at a maximum of USD 17,256,317.10).  For further information, see “—Summary of the Transaction” above.

Our board of directors determines the time of the issuance, the issue price, the manner in which the new Transocean shares have to be paid in, the date from which the new Transocean shares carry the right to dividends and, subject to the provisions of our articles of association, the conditions for the exercise of the preemptive rights with respect to the issuance and the allotment of preemptive rights that are not exercised.  The board of directors may allow preemptive rights that are not exercised to expire, or it may place such rights or Transocean shares, the preemptive rights in respect of which have not been exercised, at market conditions or use them otherwise in our interest.  For further information on preemptive rights with respect to our capital authorization for general purposes, see “—Preemptive Rights and Advance Subscription Rights” below.

An increase of the share capital by means of an offering underwritten by a financial institution, a syndicate of financial institutions or another third party or third parties, followed by an offer to the then-existing shareholders of Transocean is permissible.

Specific Authorization. For incentive compensation plans, our board of directors is authorized to issue, directly or indirectly, up to 22,500,000 new fully paid-in Transocean shares under our incentive compensation plans to members of our board of directors, members of our executive management team, officers, employees, contractors, consultants or other persons providing services to us or our subsidiaries at any time until May 16, 2029, and thereby increase the stated share capital from time to time.  For such purposes, the preemptive rights of existing shareholders are excluded.  Our board of directors determines the time of the issuance, the issue price (which may be lower than the current market price), the manner in which the new shares have to be paid and the date from which the new shares carry the right to dividends.

The capital authorization expires (a) for general purposes on May 29, 2025, (b) for incentive plans on May 16, 2029, (c) upon an earlier complete use of the maximum number of authorized Transocean shares, or (d) upon an earlier expiration of the authorization following an ordinary capital increase, an ordinary capital reduction or a change of the currency of the share capital resolved by the general meeting of shareholders.

The Transocean shares will be subject to the limitations for registration in the share register pursuant to Articles 7 and 9 of our articles of association.

Conditional Share Capital. Article 6 of our articles of association provides for a conditional share capital that allows the issuance by Transocean of up to 141,262,093 Transocean shares and thus an increase of the stated share capital by a maximum amount of USD 14,126,209.30. These shares may be issued through:

For information on preemptive rights with respect to our conditional share capital, see “—Preemptive Rights and Advance Subscription Rights” below.

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Other Classes or Series of Transocean Shares / Non-Voting Stock.  The board of directors may not create shares with increased voting powers (Stimmrechtsaktien) without the affirmative resolution adopted by shareholders holding at least two-thirds of the voting rights and an absolute majority of the par value of the shares, each as represented (in person or by proxy) at a general meeting of the shareholders.  The board of directors may create preferred stock (Vorzugsaktien) with the vote of a relative majority of the votes cast at a general meeting of our shareholders (not counting broker non-votes, abstentions and blank or invalid ballots). We have not issued any non-voting stock to date (Partizipationsscheine, Genussscheine).

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Preemptive Rights and Advance Subscription Rights

Under the Swiss Code of Obligations (the “Swiss Code”), the prior approval of a general meeting of shareholders is generally required to authorize, for later issuance, the issuance of Transocean shares, or rights to subscribe for, or convert into, Transocean shares (which rights may be connected to debt instruments or other obligations).  In addition, the existing shareholders will have preemptive rights in relation to such Transocean shares or rights in proportion to the respective par values of their holdings (Bezugsrechte).  The shareholders may, with the affirmative vote of shareholders holding two-thirds of the votes and the absolute majority of the par value of the Transocean shares represented at the general meeting, withdraw or limit the preemptive rights for valid reasons (such as a merger, an acquisition or any of the reasons authorizing the board of directors to withdraw or limit the preemptive rights of shareholders in the context of an authorized capital increase as described below).

If the general meeting of shareholders has approved the creation of a capital band or conditional capital, it may withdraw or restrict preemptive and advance subscription rights for valid reasons or delegate such decision to the board of directors. If delegated, the valid reasons justifying the exclusion of the preemptive right must be stated in the articles of association. Our articles of association provide for this delegation and state the valid reasons with respect to our capital band and conditional share capital in the circumstances described below under “—Capital Band (Capital Authorization)” and “—Conditional Share Capital.”

Capital Band (Capital Authorization).  At any time until May 29, 2025 and pursuant to Article 5 of our articles of association, our board of directors is authorized to withdraw or restrict the preemptive rights of the shareholders with respect to a maximum of 172,563,171 Transocean shares issued for general purposes and to allot them to individual shareholders, third parties, Transocean or any of its group companies with respect to the issuance of Transocean shares within the capital band if:

Pursuant to Article 5 of our articles of association, the preemptive rights of existing shareholders are excluded with respect to up to 22,500,000 Transocean shares that our board of directors is authorized to issue within the capital band under our incentive compensation plans to members of our board of directors, members of our executive management team, employees, contractors, consultants and other persons performing services to us or of any of our subsidiaries.

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Conditional Share Capital.  In connection with the issuance of bonds, notes, options, warrants or other securities or contractual obligations convertible into or exercisable or exchangeable for our shares, the preemptive rights of shareholders are excluded and the board of directors is authorized to withdraw or limit the advance subscription rights (Vorwegzeichnungsrechte) of shareholders in connection with the issuance of bonds, notes, options, warrants or other securities or contractual obligations convertible into or exercisable or exchangeable for our shares if the issuance is for purposes of financing or refinancing the acquisition of an enterprise or business, parts of an enterprise, participations or investments, or if the issuance occurs in national or international capital markets or through a private placement.

If the advance subscription rights are withdrawn or limited:

The preemptive rights and the advance subscription rights of shareholders are excluded with respect to shares, bonds, notes, options, warrants or other securities or contractual obligations issued from our conditional share capital under our incentive compensation plans to members of our board of directors, members of executive management team, employees, contractors, consultants or other persons providing services to us or any of our subsidiaries.

Dividends and Other Distributions

Under the Swiss Code, dividends (including interim dividends) may be paid out only if we have sufficient distributable profits from the previous fiscal year or the current fiscal year, or if we have freely distributable reserves (including statutory capital contribution reserves, which are also referred to as additional paid-in capital), each as will be presented on our audited annual standalone statutory balance sheet and an (audited) interim standalone statutory balance sheet, respectively.  The affirmative vote of shareholders holding a relative majority of the votes cast at a general meeting of shareholders (not counting broker non-votes, abstentions and blank or invalid ballots) must approve the distribution of dividends.  The board of directors may propose to shareholders that a dividend or other distribution be paid but cannot itself authorize the distribution.

Payments out of our share capital (in other words, the aggregate par value of our registered share capital) in the form of dividends are not allowed; however, payments out of registered share capital may be made by way of a par value reduction.  Such a par value reduction requires the approval of shareholders holding a relative majority of the votes cast at the general meeting of shareholders (not counting broker non-votes, abstentions and blank or invalid ballots).  A special audit report must confirm that claims of our creditors remain fully covered despite the reduction in the share capital recorded in the commercial register.  A licensed audit expert must prepare the audit report and be present at the general meeting of shareholders that adopts the resolution.   The board of directors must further give public notice of the par value reduction resolution in the Swiss Official Gazette of Commerce and notify creditors that they may request, within one month of the public notice, satisfaction of or security for their claims. The notification may be given before or after the general meeting of shareholders at which resolutions regarding the par value reduction were passed.

Under the Swiss Code, if our statutory profit reserves (gesetzliche Gewinnreserve) together with our statutory capital reserves (gesetzliche Kapitalreserve) amount to less than 20% of our share capital recorded in the commercial register (i.e., 20% of the aggregate par value of our registered capital), then at least 5% of our annual profit must be allocated to the statutory profit reserves.  The Swiss Code and our articles of association permit us to accrue additional general reserves.  In addition, if we acquire our own shares, we are required to account for these shares, if acquired by our parent company Transocean Ltd., as a negative item in our shareholders’ equity or, if these shares are acquired by one of our subsidiaries, to create a special reserve, in each case on our audited annual or interim standalone statutory balance sheet in the amount of the purchase price of the shares repurchased by our parent or our subsidiary.  The

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negative item in our shareholders’ equity or the reserve amount would effectively reduce our capacity to declare dividends or effect subsequent repurchases of our shares.

Swiss companies generally must maintain a separate company, stand-alone “statutory” balance sheet for the purpose of, among other things, determining the amounts available for the return of capital to shareholders, including by way of a distribution of dividends.  Our auditor must confirm that a proposal made by our board of directors to shareholders regarding the appropriation of our available earnings or the distribution of freely distributable reserves conforms to the requirements of the Swiss Code and our articles of association.  Dividends are usually due and payable shortly after the shareholders have passed a resolution approving the payment, but shareholders may also resolve at the annual or special general meeting of shareholders to pay dividends in quarterly or other installments.  Our articles of association provide that dividends that have not been claimed within five years after the payment date become our property and are allocated to the general statutory reserves.  Dividends paid out of distributable profits or distributable general reserves are subject to Swiss withholding tax, all or part of which can potentially be reclaimed under the relevant tax rules in Switzerland or double taxation treaties concluded between Switzerland and foreign countries.  Distributions to shareholders in the form of a par value reduction and distributions out of qualifying additional paid-in capital (capital contribution reserves (Reserven aus Kapitaleinlagen)) are not subject to the Swiss federal withholding tax.

Dividends, if declared by us, are expected to be declared, subject to applicable limitations under Swiss law, in U.S. dollars.  Distribution through a reduction in the par value of the shares must be declared in U.S. dollars.

Repurchases of Shares

The Swiss Code limits our ability to hold or repurchase our own shares.  We and our subsidiaries may only repurchase shares if and to the extent that sufficient freely distributable equity capital is available, as described above under “—Dividends and Other Distributions.”  The aggregate par value of all of our shares held by us and our subsidiaries may not exceed 10% of the registered share capital.  However, we may repurchase our own shares beyond the statutory limit of 10% if the shareholders have authorized our board of directors at a general meeting of shareholders (including as part of the Company's capital band) to repurchase shares in an amount in excess of 10% and the repurchased shares are dedicated for cancellation.  Any shares repurchased pursuant to such an authorization will then be cancelled based on a resolution of shareholders adopted at a general meeting of shareholders subject to the approval of shareholders holding a relative majority of the votes cast or, if shareholders have adopted a capital band authorizing our board of directors to reduce the share capital by way of a cancellation of shares, based on a resolution of the board of directors.  Repurchased shares held by us or our subsidiaries do not carry any rights to vote at a general meeting of shareholders but are, unless otherwise resolved by our shareholders at a general meeting, entitled to the economic benefits generally associated with the shares.

General Meetings of Shareholders

The general meeting of shareholders is our supreme corporate body.  Ordinary and extraordinary general meetings of shareholders may be held.  Among other things, the following powers will be vested exclusively in the general meeting of shareholders:

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Notice and Proxy Statements

Under the Swiss Code and our articles of association, we must hold an annual, ordinary general meeting of shareholders within six months after the end of our fiscal year for the purpose, among other things, of approving the annual financial statements and the annual management report, the annual election of the chairperson of our board of directors, the members of our board of directors, the members of the compensation committee of our board of directors, our auditor and our independent proxy, and the ratification of the maximum aggregate amounts of compensation of the board of directors and the executive management team.  The invitation to general meetings must be published in the Swiss Official Gazette of Commerce at least 20 calendar days prior to the date of the relevant general meeting of shareholders.  The notice of a meeting must state the items on the agenda and the proposals of the board of directors and of the shareholders who requested that a shareholders meeting be held or that an item be included on the agenda and, in case of elections, the names of the nominated candidates.  The notice must also include a short explanation of the items and proposals on the agenda of the general meeting.  No resolutions may be passed at a general meeting of shareholders concerning agenda items for which proper notice was not given.  This does not apply, however, to proposals made during a general meeting of shareholders to convene an extraordinary general meeting of shareholders, to initiate a special investigation or to elect the statutory auditor.  No previous notification will be required for proposals concerning items included on the agenda or for debates as to which no vote is taken.

Annual general meetings of shareholders are convened by the board of directors or, under certain circumstances required by law, by the auditor.  A general meeting of shareholders can be held anywhere in Switzerland. A special authorizing provision in the articles of association is required to hold a general meeting outside of Switzerland. Our current articles of association do not include such an authorization. General meetings that are held only virtually require a special authorization in the articles of association. Our current articles of association do not include such an authorization.

We expect to set the record date for each general meeting of shareholders on a date not more than 20 calendar days prior to the date of each general meeting and announce the date of the general meeting of shareholders prior to the record date.

Extraordinary General Meetings of Shareholders

An extraordinary general meeting may be called upon the resolution of the board of directors or, under certain circumstances required by law, by the auditor.  In addition, the board of directors is required to convene an

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extraordinary general meeting of shareholders if so resolved by the general meeting of shareholders, or if so requested by shareholders who, in the aggregate, represent at least 5% of the share capital or votes recorded in the commercial register, specifying the items to be included on the agenda and their proposals.  Upon such a shareholder request, the board of directors must publish the necessary notice to convene a general meeting within 60 calendar days.

If it appears from the annual stand-alone statutory balance sheet that half of the sum of our share capital, the non-distributable statutory capital reserves and the statutory profit reserves are not covered by our assets (Kapitalverlust), the board of directors is required to take measures to remedy the capital loss situation of the company, where necessary take further measures to effect a financial restructuring of the company or request the general meeting of shareholders to approve such measures as are within its authority.

Agenda Requests

Under our articles of association, any shareholder may request that an item or a proposal relating to an agenda item be included on the agenda of a general meeting of shareholders.  Such shareholder may also nominate one or more directors for election.  A request for inclusion of an item on the agenda or a proposal relating to an agenda item must be made in writing at least 30 calendar days prior to the anniversary date of the proxy statement in connection with our last annual general meeting of shareholders; provided, however, that if the date of the general meeting of shareholders is more than 30 calendar days before or after the anniversary date of the last annual general meeting of shareholders, such request must instead be made by the tenth calendar day following the date on which we have made public disclosure of the date of the general meeting of shareholders.  The request must specify in writing the relevant agenda items and proposals, together with evidence of the required shares recorded in the share register, as well as any other information as would be required to be included in a proxy statement pursuant to the rules of the SEC.

Under the Swiss Code, a general meeting of shareholders for which a notice of meeting has been duly published may not be adjourned without publishing a new notice of meeting.

Our annual report, our standalone and consolidated financial statements, the auditors’ reports thereon, our compensation report pursuant to Swiss law and the auditor’s reports thereon, and our report on non-financial matters pursuant to article 964c of the Swiss Code (to the extent required by applicable law) must be made available to our shareholders no later than 20 calendar days prior to the annual general meeting of shareholders.  If these documents are not accessible electronically, each shareholder may request that these documents be promptly sent to it in due course, free of charge.

Voting

Each of our shares carries one vote at a general meeting of shareholders.  Voting rights may be exercised by shareholders registered in our share register or by a duly appointed proxy of a registered shareholder (including the independent proxy), which proxy need not be a shareholder.  Our articles of association do not limit the number of shares that may be voted by a single shareholder.  Shareholders wishing to exercise their voting rights who hold their shares through a bank, broker or other nominee should follow the instructions provided by such bank, broker or other nominee or, absent instructions, contact such bank, broker or other nominee for instructions.  Shareholders holding their shares through a bank, broker or other nominee will not automatically be registered in our share register.  If any such shareholder wishes to be registered in our share register, such shareholder should contact the bank, broker or other nominee through which it holds our shares.

Treasury shares, whether owned by us or one of our majority-owned subsidiaries, will not be entitled to vote at general meetings of shareholders.

Our articles of association do not provide for cumulative voting for the election of directors.

Pursuant to our articles of association, the shareholders generally pass resolutions by the affirmative vote of a relative majority of the votes cast at the general meeting of shareholders (broker nonvotes, abstentions and blank and invalid ballots will be disregarded), unless otherwise provided by law or our articles of association.  However, our articles of association provide that directors may be elected at a general meeting of shareholders by a plurality of the votes cast by the shareholders present in person or by proxy at the meeting.  Our Corporate Governance Guidelines

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have a majority vote policy that provides that the board may nominate only those candidates for director who have submitted an irrevocable letter of resignation which would be effective upon and only in the event that (1) such nominee fails to receive a sufficient number of votes from shareholders in an uncontested election and (2) the board accepts the resignation following such failure.  If a nominee who has submitted such a letter of resignation does not receive more votes cast “for” than “against” the nominee’s election, the corporate governance committee must promptly review the letter of resignation and recommend to the board of directors whether to accept the tendered resignation or reject it.  The board of directors must then act on the corporate governance committee’s recommendation within 90 days following the shareholder vote.  The board of directors must promptly disclose its decision regarding whether or not to accept the nominee’s resignation letter.

The acting chair may direct that resolutions and elections be held by use of an electronic voting system.  Electronic resolutions and elections are considered equal to resolutions and elections taken by way of a written ballot. The board of directors can determine that shareholders, who are not present at the venue of the general meeting of shareholders may exercise their rights by electronic means. Virtual only meetings may only be held if the articles of association expressly authorize such a form of the general meeting. Our current articles of association do not include such an authorization.

The Swiss Code and/or our articles of association require the affirmative vote of at least two-thirds of the voting rights and the absolute majority of the par value of the shares, each as represented at a general meeting to approve, among other things, the following matters:

The same qualified voting requirements apply to resolutions in relation to transactions among corporations based on Switzerland’s Federal Act on Mergers, Demergers, Transformations and the Transfer of Assets and Liabilities (the “Merger Act”), including a merger, demerger or conversion of a corporation (other than a cash-out or certain squeeze-out mergers, in which minority shareholders of the company being acquired may be compensated in a form other than through shares of the acquiring company, for instance, through cash or securities of a parent company of the acquiring company or of another company—in such a merger, an affirmative vote of 90% of the outstanding

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shares is required).  Swiss law may also impose this qualified voting requirement in connection with the sale of “all or substantially all of our assets” by us.  See “—Compulsory Acquisitions; Appraisal Rights” below.

Our articles of association require the affirmative vote of at least two-thirds of the shares entitled to vote at a general meeting to approve the following matters:

Our articles of association require the affirmative vote of holders of the number of our shares at least equal to the sum of (A) two-thirds of the number of all shares outstanding and entitled to vote at a general meeting, plus (B) a number of shares outstanding and entitled to vote at the general meeting that is equal to one-third of the number of shares held by an interested shareholder, for us to engage in any business combination with an interested shareholder (as those terms are defined in our articles of association) and for the amendment of the provisions in our articles of association relating to this shareholder approval requirement.

Quorum for General Meetings

The presence of shareholders, in person or by proxy, holding at least a majority of the shares entitled to vote at the time when the general meeting proceeds to business is generally the required presence for a quorum for the transaction of business at a general meeting of shareholders.  However, the presence of shareholders, in person or by proxy, holding at least two-thirds of the share capital recorded in the commercial register at the time when the general meeting proceeds to business is the required presence for a quorum to adopt a resolution to amend, vary, suspend the operation of or cause any of the following provisions of our articles of association to cease to apply:

Additionally, shareholders present, in person or by proxy, holding at least two-thirds of the share capital recorded in the commercial register at the time when the general meeting proceeds to business constitute the required presence for a quorum at a general meeting to adopt a resolution to remove a serving director.

Under the Swiss Code, the board of directors has no authority to waive quorum requirements stipulated in the articles of association.

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Inspection of Books and Records

Under the Swiss Code, a shareholder has a right to inspect the share register with regard to his, her or its own shares and otherwise to the extent necessary to exercise his, her or its shareholder rights.  No other person has a right to inspect the share register.  Shareholders who hold, alone or together, shares representing at least 5% of the share capital or the votes may request to inspect our books and records. Subject to prevailing business secrets or other of our material interests, our board of directors may authorize such inspection to the extent necessary to exercise shareholder rights within four months following receipt of such requests.   At a general meeting of shareholders, any shareholder is entitled to request information from the board of directors concerning the affairs of the company.  Shareholders may also ask the auditor questions regarding its audit of the company.  The board of directors and the auditor must answer shareholders’ questions to the extent necessary for the exercise of shareholder rights and subject to prevailing business secrets or other of our material interests.

Special Investigation

If the shareholders’ inspection and information rights as outlined above prove to be insufficient, any shareholder may propose to the general meeting of shareholders that a special independent commissioner investigate specific facts in a special investigation.  If the general meeting of shareholders approves the proposal, we or any shareholder may, within 30 calendar days after the general meeting of shareholders, request the court at our registered office to appoint a special independent commissioner.  If the general meeting of shareholders rejects the request, one or more shareholders representing at least 5% of the share capital or the votes may request, within three months after the general meeting, the court to appoint a special independent commissioner.  The court will issue such an order if the petitioners can demonstrate prima facie that the board of directors, any member of our board of directors or one of our officers infringed the law or our articles of association and such infringements are capable of causing damage the company or the shareholders.  The costs of the investigation would generally be allocated to us and only in exceptional cases to the petitioners.

Compulsory Acquisitions; Appraisal Rights

Swiss companies that undertake business combinations and other transactions that are binding on all shareholders are governed by the Merger Act.  A statutory merger or demerger requires that at least two-thirds of the votes and the absolute majority of the par value of the shares, each as represented at the general meeting of shareholders, vote in favor of the transaction.  Under the Merger Act, a “demerger” may take two forms:

If a transaction under the Merger Act receives all of the necessary consents, all shareholders would be compelled to participate in the transaction.  See “—Voting” above.

Swiss companies may be acquired by an acquirer through the direct acquisition of the share capital of the Swiss company.  With respect to corporations limited by shares, such as Transocean, the Merger Act provides for the possibility of a so-called “cash-out” or “squeeze-out” merger if the acquirer controls 90% of the outstanding shares.  In these limited circumstances, minority shareholders of the company being acquired may be compensated in a form other than through shares of the acquiring company (for instance, through cash or securities of a parent company of the acquiring company or of another company).  For business combinations effected in the form of a statutory merger or demerger and subject to Swiss law, the Merger Act provides that if the equity rights have not been adequately preserved or compensation payments in the transaction are unreasonable, a shareholder may request the competent court to determine a reasonable amount of compensation.

In addition, under Swiss law, the sale of “all or substantially all of our assets” by us may require a resolution of the general meeting of shareholders passed by holders of at least two-thirds of the votes and the absolute majority

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of the par value of the shares, each as represented at the general meeting of shareholders.  Whether or not a shareholder resolution is required depends on the particular transaction, including whether the following test is satisfied:

If all of the foregoing apply, a shareholder resolution would likely be required.

Legal Name; Formation; Fiscal Year; Registered Office

Transocean Ltd. was initially formed on August 18, 2008.  It is incorporated and domiciled in Steinhausen, Canton of Zug, Switzerland, and operates under the Swiss Code as a stock corporation (Aktiengesellschaft).  Transocean Ltd. is recorded in the Commercial Register of the Canton of Zug with the registration number CHE-114.461.224.  Transocean’s fiscal year is the calendar year.

The address of Transocean’s registered office is Transocean Ltd., Turmstrasse 30, 6312 Steinhausen, Switzerland, and the telephone number at that address is +41 (41) 749 0500.

Corporate Purpose

Transocean Ltd. is the parent holding company of the Transocean group.  Pursuant to its articles of association, its business purpose is to acquire, hold, manage, exploit and sell, whether directly or indirectly, participations in businesses in Switzerland and abroad, in particular in businesses that are involved in offshore contract drilling services for oil and gas wells, oil and gas drilling management services, drilling engineering services and drilling project management services and oil and gas exploration and production activities, and to provide financing for this purpose.  Transocean Ltd. may acquire, hold, manage, mortgage and sell real estate and intellectual property rights in Switzerland and abroad.

Duration and Liquidation

Our articles of association do not limit our duration.  Under Swiss law, we may be dissolved at any time by a resolution adopted at a general meeting of shareholders, which must be passed by the affirmative vote of holders of at least two thirds of votes and the absolute majority of the par value of the shares, each as represented (in person or by proxy) at the general meeting.  Dissolution and liquidation by court order is possible if (1) we become bankrupt or (2) shareholders holding at least 10% of our share capital so request for valid reasons.  Under Swiss law, any surplus arising out of liquidation (after the settlement of all claims of all creditors) is distributed in proportion to the paid-up par value of shares held. The amount exceeding the par value of the share is subject to Swiss withholding tax of 35%.  Our shares carry no privilege with respect to such liquidation surplus.

Uncertificated Shares

Our shares have been issued in uncertificated form in accordance with article 973c of the Swiss Code as uncertificated securities, which have been registered with Computershare, and constitute intermediated securities within the meaning of the Swiss Federal Act on Intermediated Securities.  In accordance with article 973c of the Code, Transocean Ltd. maintains a register of uncertificated securities (Wertrechtebuch).

Stock Exchange Listing

Our shares are listed and trade on the NYSE under the symbol “RIG.”

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No Sinking Fund

The shares have no sinking fund provisions.

No Liability for Further Calls or Assessments

The shares that have been issued to date are duly and validly issued, fully paid and nonassessable.

No Redemption and Conversion

The shares are not convertible into shares of any other class or series or subject to redemption either by us or the holder of the shares.

Transfer and Registration of Shares

We have not imposed any restrictions applicable to the transfer of our shares, other than the requirement that an acquirer of shares expressly declares to have acquired the shares in its own name and for its own account.  Our share register is maintained by Computershare, which acts as transfer agent and registrar.  The share register reflects only record owners of our shares.  Swiss law does not recognize fractional share interests.

SELLING SECURITYHOLDERS

The selling securityholders listed in the table below and/or their respective affiliates may offer and sell, from time to time, in one or more offerings, our shares, par value USD 0.10 per share, pursuant to this prospectus and any applicable prospectus supplement.  

The following table sets forth the name of each of the selling securityholders, the number of shares beneficially owned by each such selling securityholder prior to this offering, the maximum number of securities that may be offered under this prospectus by each such selling securityholder, and the number of securities to be beneficially owned by each such selling securityholder upon completion of this offering, assuming that all securities offered hereunder are sold as contemplated in this prospectus.  The number of securities in the column “Maximum Number of Shares That May Be Offered” represents all of the securities that each selling securityholder may offer under this prospectus.

Beneficial ownership for the purposes of the following table is determined in accordance with the rules and regulations of the SEC.  These rules generally provide that a person is the beneficial owner of securities if such person has or shares the power to vote or direct the voting thereof, or to dispose or direct the disposition thereof or has the right to acquire such powers within 60 days.  Percentage of beneficial ownership both prior to and after this offering is based on 940,828,901 shares outstanding as of June 28, 2024.

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Material Relationships with Selling Securityholders

On February 14, 2018, we and the selling securityholders established the Joint Venture which owns the Transocean Norge. Prior to June 28, 2024, we owned 33.0% of the equity of the Joint Venture entity and the selling securityholders’ owned 67.0% of such equity. On June 28, 2024 we entered into the SPA to acquire the selling securityholders’ 67.0% ownership interest in the Joint Venture entity.

On June 28, 2024, in connection with the SPA, we entered into a Registration Rights Agreement with the selling securityholders (the “Registration Rights Agreement”). Pursuant to the Registration Rights Agreement, we have agreed to provide to the selling securityholders certain registration rights with respect to the securities covered by this prospectus. The Registration Rights Agreement contains customary terms and conditions, including certain customary indemnification obligations.

The registrable securities and the notes were issued to the selling securityholders as consideration for such acquisition. This prospectus is not an offer to sell or a solicitation of an offer to buy the notes. The SPA and related transactions are further described in our current report on Form 8-K, filed with the SEC on June 28, 2024.

The selling securityholders and their respective affiliates are engaged in various financial activities, which may include securities trading and hedging activities (including, in each case, with respect to securities or instruments of us and our affiliates). For example, in the past the selling securityholders and their affiliates have held positions in our convertible notes, and may in the future hold positions in our convertible notes and other securities.

PLAN OF DISTRIBUTION

The selling securityholders may offer and sell, from time to time, some or all of the securities covered by this prospectus.  Registration of the securities covered by this prospectus does not mean, however, that those securities necessarily will be offered or sold.  We will not receive any proceeds from any sale by the selling securityholders of the registrable securities.  See “Use of Proceeds.”  We will pay all expenses incurred in connection with our obligations in filing this registration statement, except for underwriters’ discounts and selling commissions, if any, and any fees or expenses of counsel to the selling securityholders.  The selling securityholders will pay all underwriting discounts and similar selling expenses, if any, as well as the fees and expenses of its counsel, attributable to the sale of the securities covered by this prospectus.

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The selling securityholders may sell the securities covered by this prospectus from time to time, at market prices prevailing at the time of sale, at prices related to market prices, at a fixed price or prices subject to change, or at negotiated prices, by a variety of methods including the following:

In effecting sales, brokers or dealers engaged by the selling securityholders may arrange for other brokers or dealers to participate.  Broker-dealers may receive discounts, concessions or commissions from the selling stockholders (or, if any broker-dealer acts as agent for the purchaser of shares, from the purchaser) in amounts to be negotiated. Such compensation may be in excess of customary discounts, concessions or commissions. If dealers are utilized in the sale of securities, the names of the dealers and the terms of the transaction will be set forth in a prospectus supplement, if required.

The selling securityholders will act independently of us in making decisions with respect to the timing, manner and size of each sale of securities covered by this prospectus.  The selling securityholders might not sell any securities under this prospectus. In addition, any securities covered by this prospectus that qualify for sale pursuant to Rule 144 under the Securities Act may be sold under Rule 144 rather than pursuant to this prospectus.

To the extent required by law in connection with a particular offering, this prospectus would be amended or supplemented from time to time to describe a specific plan of distribution. Any such prospectus supplement relating to a particular offering of the securities covered by this prospectus would include, to the extent required by law, the name or names of any underwriters, dealers, brokers or agents, any discounts, concessions and other items constituting

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compensation from the selling securityholders and any discounts or concessions allowed or reallowed or paid to dealers.  Such prospectus supplement, if required, and, if necessary, a post-effective amendment to the registration statement of which this prospectus is a part, would be filed with the SEC to reflect the disclosure of additional information with respect to such distribution.

In connection with any sale of the securities covered by this prospectus through underwriters, underwriters may receive compensation in the form of underwriting discounts.  Underwriters may sell to or through dealers, and such dealers may receive compensation in the form of discounts or concessions from the underwriters.

Any underwriters, broker-dealers or agents participating in the distribution of the securities covered by this prospectus may be deemed to be “underwriters” within the meaning of the Securities Act.  The selling securityholders may also be deemed to be underwriters, and any discounts they receive and any profit they realize on the sale of the securities may be deemed to be underwriting commissions under the Securities Act.

Any underwriters or agents could make sales in privately negotiated transactions or any other method permitted by law, including sales deemed to be an at-the-market offering as defined in Rule 415 promulgated under the Securities Act, which includes sales made directly on or through the NYSE or sales made to or through a market maker other than on an exchange.

The selling securityholders may enter into derivative transactions with third parties, or sell securities not covered by this prospectus to third parties in privately negotiated transactions.  In connection with those derivatives, the third parties may sell securities covered by this prospectus, including in short sale transactions.  If so, the third party may use securities pledged by the selling securityholders or borrowed from the selling securityholders or others to settle those sales or to close out any related open borrowings of stock, and may use securities received from the selling securityholders in settlement of those derivatives to close out any related open borrowings of stock.  The third party in such sale transactions will be an underwriter and, if required, will be identified in a prospectus supplement (or a post-effective amendment).

Any underwriters, dealers, agents and other persons may be entitled, under agreements that they may enter into with us and the selling securityholders, to indemnification by us and the selling securityholders against certain liabilities, including liabilities under the Securities Act.

In connection with the offering, any underwriters may purchase and sell securities in the open market.  These transactions may include short sales, stabilizing transactions and purchases to cover positions created by short sales.  Shorts sales involve the sale by any underwriters of a greater number of securities than they are required to purchase in the offering.  “Covered” short sales are sales made in an amount not greater than the underwriters’ option to purchase additional securities from us in the offering.  Any underwriters may close out any covered short position by either exercising their option to purchase additional securities or purchasing securities in the open market.  In determining the source of securities to close out the covered short position, any underwriters may consider, among other things, the price of securities available for purchase in the open market as compared to the price at which they may purchase securities through the overallotment option.  “Naked” short sales are any sales in excess of such option.  Any underwriters must close out any naked short position by purchasing securities in the open market.  A naked short position is more likely to be created if the underwriters are concerned that there may be downward pressure on the price of the securities in the open market after pricing that could adversely affect investors who purchase in the offering.  Stabilizing transactions consist of various bids for or purchases of securities made by the underwriters in the open market prior to the completion of the offering.

Any underwriters may also impose a penalty bid.  This occurs when a particular underwriter repays to the underwriters a portion of the underwriting discount received by it because the representatives have repurchased securities sold by or for the account of such underwriter in stabilizing or short covering transactions.

Purchases to cover a short position and stabilizing transactions may have the effect of preventing or retarding a decline in the market price of the securities, and together with the imposition of the penalty bid, may stabilize, maintain or otherwise affect the market price of the securities.  As a result, the price of the securities may be higher than the price that otherwise might exist in the open market.  If these activities are commenced, they may be

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discontinued at any time.  These transactions may be effected on the NYSE, in the over-the-counter market or otherwise.

Any underwriters, agents or dealers that may participate in a particular offering, or any of their affiliates, may have provided from time to time, and may provide in the future, investment, commercial banking, derivatives and financial advisory services to us or the selling securityholders and its affiliates in the ordinary course of business, for which they have received or may receive customary fees.

As used herein, the selling securityholders may include an affiliate of the selling securityholders the selling securityholders transfers its registrable securities to one of its affiliates.

MATERIAL TAX CONSEQUENCES

Material U.S. Federal Income Tax Consequences

The following is a discussion of the material U.S. federal income tax consequences to Holders (as defined below) of the ownership and disposition of shares. This discussion applies only to Holders who hold shares as “capital assets” for U.S. federal income tax purposes (generally, property held for investment purposes), and does not describe all of the U.S. federal income tax consequences that may be relevant to Holders in light of their particular circumstances, including alternative minimum tax and Medicare contribution tax consequences, as well as differing tax consequences that may apply if a Holder is, for instance:

This summary is based on the Internal Revenue Code of 1986, as amended to the date hereof, administrative pronouncements, judicial decisions and final, temporary and proposed Treasury regulations, changes to any of which subsequent to the date of this registration statement may affect the tax consequences described herein, possibly on a retroactive basis.  This summary does not address any aspect of state, local or non-U.S. taxation, or any U.S. federal taxes other than U.S. federal income taxes (such as estate and gift taxes).  Holders should consult their tax advisors

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with regard to the application of the U.S. federal tax laws to their particular situation, as well as any tax consequences arising under the laws of any state, local or foreign taxing jurisdiction.

For purposes of this discussion, you are a “U.S. Holder” if, for U.S. federal income tax purposes, you are a beneficial owner of shares that is:

A “Non-U.S. Holder” is any beneficial owner of shares that, for U.S. federal income tax purposes, is an individual, corporation, estate, or trust that is not a U.S. Holder.

As used in this discussion, a “Holder” means a U.S. Holder, a Non-U.S. Holder, or both, as the context may require.

If an entity or arrangement treated as a partnership for U.S. federal income tax purposes holds shares, the tax treatment of the partnership and a partner in such partnership generally will depend on the status of the partner and the activities of the partnership.  Such partner or partnership should consult its own tax advisor as to the U.S. federal income tax consequences of the ownership and disposition of shares.

ALL HOLDERS ARE URGED TO CONSULT THEIR TAX ADVISORS REGARDING THE PARTICULAR FEDERAL, STATE, LOCAL, AND NON-U.S. TAX CONSEQUENCES TO THEM OF THE OWNERSHIP AND DISPOSITION OF SHARES.

U.S. Holders

Distributions on the Shares

Subject to the discussion under “—PFIC Considerations” below, the gross amount of a distribution paid with respect to the shares, including the full amount of any Swiss withholding tax on such amount, will be a dividend for U.S. federal income tax purposes to the extent of our current-year and/or accumulated earnings and profits (as determined for U.S. federal income tax purposes).  Distributions in excess of our current-year and accumulated earnings and profits will be treated first as a tax-free return of capital to the extent of the U.S. Holder’s tax basis in the shares and will reduce (but not below zero) such basis. A distribution in excess of our current-year and accumulated earnings and profits and the U.S. Holder’s tax basis in the shares will be treated as capital gain realized on the sale or exchange of such shares. However, we may be unable to determine the portion of a distribution that is a dividend for U.S. federal income tax purposes, in which case we will be required to report the entire amount of such distribution as a dividend. U.S. Holders that are corporations generally will not be entitled to claim a dividends received deduction with respect to distributions received from us. The amount of any distribution of property other than cash will be the fair market value of such property on the date of such distribution.

In general, dividends paid with respect to the shares to certain non-corporate U.S. Holders will be treated as “qualified dividend income,” which is taxable to such a U.S. Holder at preferential capital gain tax rates provided that (i) our shares are readily tradable on an established securities market in the United States (such as the NYSE) or we are eligible for the benefits of a comprehensive income tax treaty with the United States that the IRS has determined is satisfactory and that includes an exchange of information program, (ii) as discussed below in “—PFIC Considerations,” we are not a PFIC for the taxable year during which the dividend is paid or the immediately preceding taxable year, and (iii) certain holding period and other requirements are satisfied.  For purposes of clause (i) above,

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our shares should be treated as readily tradable on an established securities market in the United States so long as they are listed on the NYSE.

U.S. Holders would be subject to special rules relating to foreign currency transactions if we were to make distributions in a currency other than in United States dollars. In that case, U.S. Holders should consult their tax advisors regarding the application of such rules.

Foreign Tax Credit

In general, dividends paid with respect to the shares will constitute foreign source income and will be considered passive category income for purposes of computing the foreign tax credit allowable to U.S. Holders.  If the dividends are taxed as qualified dividend income (as discussed above), the amount of the dividend taken into account for purposes of calculating the foreign tax credit limitation generally will be limited to the gross amount of the dividend, multiplied by the reduced tax rate applicable to qualified dividend income and divided by the highest tax rate normally applicable to dividends. However, if we are a “United States-owned foreign corporation” (generally, a foreign corporation 50% or more of the stock of which, by vote or value, is held directly, indirectly or under applicable constructive ownership rules, by United States persons), at least a portion of the dividends paid with respect to the shares will be U.S. source income for foreign tax credit purposes if and to the extent that more than a de minimis amount of the earnings and profits out of which the dividends are paid is from sources within the United States. We cannot provide any assurances that we will not be characterized as a “United States-owned foreign corporation” as we do not track our ownership of shares by United States persons. Moreover, we do not expect to maintain calculations with respect to the source of our earnings and profits under U.S. federal income tax principles.  Swiss tax, if any, withheld on distributions to a U.S. Holder and paid over to Switzerland may be eligible for foreign tax credits (or deduction in lieu of such credits) for U.S. federal income tax purposes, subject to special limitations. Under recently finalized Treasury regulations, it is possible that Swiss tax may not be creditable unless a U.S. Holder is eligible for and elects to apply the benefits of the income tax treaty between the United States and Switzerland. Application of certain aspects of those recently finalized Treasury Regulations has been suspended under an IRS notice for taxable years ending before the date that a subsequent notice or other guidance is released. The calculation of foreign tax credits involves the application of complex rules that depend on a U.S. Holder’s particular circumstances and the value of any potential tax credit may be limited if we were characterized as a “United States-owned foreign corporation.” U.S. Holders are urged to consult their own tax advisors regarding the availability of foreign tax credits.

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Sale, Exchange, or Other Taxable Disposition of Shares

Subject to the discussion under “—PFIC Considerations” below, in general, the sale, exchange, or other taxable disposition of shares will result in taxable gain or loss to a U.S. Holder equal to the difference between (i) the amount of cash plus the fair market value of any other property received by such U.S. Holder in the sale, exchange, or other taxable disposition and (ii) such U.S. Holder’s adjusted basis in the shares.

Gain or loss recognized on the sale, exchange, or other taxable disposition of shares generally will be capital gain or loss and will be long-term capital gain or loss if the shares have been held for more than one year at the time of the sale, exchange, or other taxable disposition. Long-term capital gains of non-corporate U.S. Holders (including individuals) generally are subject to tax at preferential U.S. federal income tax rates. The deductibility of capital losses is subject to limitations.  Any such gain or loss recognized generally will be treated as U.S. source income or loss for purposes of computing a U.S. Holder’s foreign tax credit for U.S. federal income tax purposes and, as a result of the U.S. foreign tax credit limitation, foreign taxes, if any, imposed upon capital gains in respect of the shares may not be creditable. U.S. Holders should consult their own tax advisors regarding the tax consequences if a foreign tax is imposed on a disposition of shares, including the availability of a foreign tax credit or deduction in respect of any foreign tax imposed on a sale or other disposition of shares.

PFIC Considerations

The treatment of U.S. Holders could differ materially from that described above if, at any relevant time, we were or we become a passive foreign investment company (“PFIC”). For U.S. federal income tax purposes, we would be treated as a PFIC for any taxable year in which after applying relevant look-through rules with respect to the income and assets of subsidiaries, either:

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For this purpose, we are deemed to own our proportionate share of the assets and to receive directly our proportionate share of the income of any other corporation and any partnership in which we own, directly or indirectly, at least 25% of the value of the equity interests.  

We believe that we have not been and, based on the current and anticipated composition of our assets and income and the current expectations regarding the price of the shares, will not be a PFIC with respect to any taxable year. We believe that our income from offshore contract drilling services should be treated as “non-passive” services income for purposes of the PFIC rules and therefore that the assets we own and operate in connection with the production of such income should not constitute passive assets. There is significant legal authority supporting this position, including statutory provisions, legislative history, case law and IRS pronouncements concerning the characterization, for other tax purposes, of income derived from services where a substantial component of such income is attributable to the value of the property or equipment used in connection with providing such services. It should be noted, however, that a prior case and an IRS pronouncement which relies on the case characterize income from time chartering of vessels as rental income rather than services income for other tax purposes. However, the IRS subsequently has formally announced that it does not agree with the decision in that case. Furthermore, we believe that the terms of the time charters in that case differ in material respects from the terms of our drilling contracts with customers.

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Although we believe that we have not been and will not become a PFIC, no assurance can be given that the IRS or a court will accept this position, and there is a risk that the IRS or a court could determine that we are a PFIC.  Moreover, because the determination of whether we are a PFIC must be made on an annual basis, we cannot assure U.S. Holders that we will not be a PFIC for the current taxable year or become a PFIC for any future taxable years.

As discussed more fully below, if we were to be treated as a PFIC for any taxable year, a U.S. Holder would be subject to different, generally adverse, taxation rules depending on whether or not the U.S. Holder makes (i) an election to treat us as a qualified electing fund (a “QEF” election) or (ii) a “mark-to-market” election with respect to the shares, as discussed below. If we are a PFIC, a U.S. Holder generally will be subject to the PFIC rules described herein with respect to any of our subsidiaries that are PFICs. However, the mark-to-market election discussed below generally will not be available with respect to shares of any such PFIC subsidiaries.  In addition, if a U.S. Holder owns shares during any taxable year in which we are a PFIC, such U.S. Holder must file an annual report with the IRS on IRS Form 8621. A failure to file this report as required may toll the running of the statute of limitations in respect of each of the U.S. Holder’s taxable years for which the report is required to be filed. As a result, the taxable years with respect to which the U.S. Holder fails to file the report may remain open to assessment by the IRS indefinitely, until the report is filed.

Taxation of U.S. Holders Making a Timely QEF Election

If a U.S. Holder makes a timely QEF election in a taxable year, then for that and for all subsequent taxable years in which such U.S. Holder has held the shares and we are a PFIC, such U.S. Holder must include in income for such U.S. Holder’s taxable year its pro rata share of our ordinary earnings and net capital gain, if any, for our taxable years that end with or within the taxable year for which the U.S. Holder is reporting, regardless of whether the U.S. Holder received any distributions from us in that year. The U.S. Holder’s adjusted basis in the shares will be increased to reflect taxed but undistributed earnings and profits. Distributions of earnings and profits that were previously taxed will result in a corresponding reduction in the U.S. Holder’s adjusted basis in the shares and will not be taxed again once distributed. A U.S. Holder generally will recognize capital gain or loss on the sale, exchange, or other disposition of shares. A U.S. Holder makes a QEF election with respect to any year that we are a PFIC by checking the appropriate box on IRS Form 8621 and filing that form with its U.S. federal income tax return. If, contrary to our expectations, we determine that we are treated as a PFIC for any taxable year, we will endeavor (but will not be required) to provide each U.S. Holder with the information necessary to make the QEF election described above.

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Taxation of U.S. Holders Making a Mark-to-Market Election

If we were to be treated as a PFIC for any taxable year and the shares were treated as “marketable stock,” then, as an alternative to making a QEF election, a U.S. Holder would be allowed to make a mark-to-market election with respect to the shares, provided the U.S. Holder completes and files IRS Form 8621 in accordance with the relevant instructions and related U.S. Treasury Department regulations. If that election is made, the U.S. Holder generally would include as ordinary income in each taxable year the excess, if any, of the fair market value of the U.S. Holder’s shares at the end of the taxable year over the U.S. Holder’s adjusted basis in the shares.  The U.S. Holder would also be permitted an ordinary loss in respect of the excess, if any, of the U.S. Holder’s adjusted basis in the shares over the fair market value of the shares at the end of the taxable year, but only to the extent of the net amount previously included in income as a result of the mark-to-market election. A U.S. Holder’s basis in its shares would be adjusted to reflect any such income or loss recognized. Gain recognized on the sale, exchange, or other disposition of shares would be treated as ordinary income, and any loss recognized on the sale, exchange, or other disposition of shares would be treated as ordinary loss to the extent such loss does not exceed the net mark-to-market gains previously included in income by the U.S. Holder. Because the mark-to-market election applies only to marketable stock, however, it would generally not apply to a U.S. Holder’s indirect interest in any of our subsidiaries that were determined to be PFICs.

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Taxation of U.S. Holders Not Making a Timely QEF or Mark-to-Market Election

If we were treated as a PFIC for any taxable year, a U.S. Holder that does not make either a QEF election or a mark-to-market election for that year would be subject to adverse tax rules with respect to (i) any excess distribution (generally, the portion of any distributions received by the U.S. Holder with respect to the shares in a taxable year in excess of 125% of the average annual distributions received by the U.S. Holder with respect to the shares in the three preceding taxable years or, if shorter, the U.S. Holder’s holding period for the shares) and (ii) any gain realized on the sale, exchange, or other disposition of the shares. Under these special rules:

Unless a U.S. Holder makes a QEF election or mark-to-market election with respect to the shares, a U.S. Holder that holds shares during a period in which we are a PFIC will be subject to the foregoing rules for that taxable year and all subsequent taxable years in which the U.S. Holder holds shares, even if we cease to be a PFIC.

Classification as a PFIC may have other adverse tax consequences, including in the case of individual U.S. Holders, the denial of a step-up in the tax basis of the shares at death.

The PFIC rules are very complex. U.S. Holders are urged to consult their tax advisors regarding the potential application of the PFIC rules to their investment in the shares, including the advisability of choosing to make a QEF election or mark-to-market election.

Backup Withholding Tax and Information Reporting Requirements

U.S. backup withholding tax and information reporting requirements generally apply to certain payments made to certain non-corporate U.S. Holders. Information reporting generally will apply to payments of dividends on and to proceeds from the sale or redemption of shares made within the United States or by a U.S. payor or U.S. middleman to a U.S. Holder (other than an "exempt recipient," including a corporation, a payee that is not a U.S. person that provides an appropriate certification, and certain other persons).

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A payor will be required to withhold backup withholding tax from any payments of dividends on, or the proceeds from the sale or redemption of, shares within the United States or by a U.S. payor or U.S. middleman to a U.S. Holder, other than an exempt recipient, if such U.S. Holder fails to furnish its correct taxpayer identification number or otherwise fails to comply with, or establish an exemption from, such backup withholding tax requirements. Backup withholding is not an additional tax and may be credited against a U.S. Holder’s regular U.S. federal income tax liability or, if in excess of such liability, refunded by the IRS if a timely refund claim is filed with the IRS.

Information Reporting Regarding Foreign Financial Assets

Individual U.S. Holders that hold certain “foreign financial assets” (which generally includes stock and other securities issued by a foreign person unless held in an account maintained by a financial institution) that exceed certain thresholds are required to report to the IRS information relating to such assets.  Under certain circumstances, an entity may be treated as an individual for purposes of these rules.  Significant penalties may apply for failure to satisfy these reporting obligations.  Individual U.S. Holders are urged to consult their tax advisors regarding the effect, if any, of these reporting obligations on their investment in the shares.

Non-U.S. Holders

Distributions on the Shares

Subject to the discussion under “—Information Reporting and Backup Withholding” below, a Non-U.S. Holder will not be subject to U.S. federal income or withholding tax on dividends received on its shares, unless the dividends are effectively connected with the Non-U.S. Holder’s conduct of a trade or business in the United States (and, if a tax treaty applies, the dividends are attributable to a permanent establishment or fixed place of business maintained by such Non-U.S. Holder in the United States).

Except to the extent otherwise provided in an applicable tax treaty, a Non-U.S. Holder generally will be taxed in the same manner as a U.S. Holder on dividends that are effectively connected with the Non-U.S. Holder’s conduct of a trade or business in the United States.  Effectively connected dividends received by a corporate Non-U.S. Holder may also, in certain circumstances, be subject to an additional branch profits tax at a 30% rate (or, if applicable, a lower treaty rate), subject to certain adjustments.

Sale, Exchange, or Other Taxable Disposition of Shares

Subject to the discussion under “—Information Reporting and Backup Withholding” below, a Non-U.S. Holder will not be subject to U.S. federal income or withholding tax on any gain recognized on a sale, exchange, or other taxable disposition of shares, unless:

Except to the extent otherwise provided under an applicable tax treaty, a Non-U.S. Holder generally will be taxed in the same manner as a U.S. Holder on recognized gains that are effectively connected with the Non-U.S. Holder’s conduct of a trade or business in the United States. Effectively connected gains recognized by a corporate Non-U.S. Holder may also, in certain circumstances, be subject to an additional branch profits tax at a 30% rate (or, if applicable, a lower treaty rate), subject to certain adjustments.

Information Reporting and Backup Withholding

Dividends paid with respect to shares and proceeds from a sale or other disposition of shares received in the United States or through certain U.S.-related financial intermediaries may be subject to information reporting and backup withholding unless the Non-U.S. Holder provides proof of an applicable exemption or furnishes its taxpayer identification number and otherwise complies with all applicable requirements under the backup withholding

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rules.  Any amounts withheld under the backup withholding rules are not an additional tax and may be allowed as a refund or credit against the Non-U.S. Holder’s U.S. federal income tax liability, provided that the required information is timely furnished to the IRS.

Swiss Taxation

Set out below is a summary of certain Swiss tax matters related to the purchase, holding and disposal of shares.  The statements below regarding Swiss taxation are based on the laws in force in Switzerland as of the date of this prospectus supplement, which may be subject to any changes in law occurring after such date.  Such changes could possibly be made on a retroactive basis.  The summary does not address foreign tax laws.

The summary is of a general nature and does not purport to be a comprehensive description of all the Swiss tax considerations that may be relevant for a decision to purchase, own or dispose of shares.  Shareholders who wish to clarify their own tax situation should consult with and rely upon their own tax advisers.  Shareholders resident in Switzerland or holding their shares as part of a Swiss permanent establishment should consult with their own tax advisers regarding the Swiss income tax treatment of the purchase, holding and disposal of shares.

Swiss Withholding Tax

Under present Swiss tax law, dividends due and similar cash or in-kind distributions made by Transocean Ltd. to a shareholder of shares (including liquidation proceeds and stock dividends) are subject to Swiss federal withholding tax (Verrechnungssteuer) (“Withholding Tax”), currently at a rate of 35% (applicable to the gross amount of the taxable distribution). Transocean Ltd. is obliged to deduct the Withholding Tax from the gross amount of any taxable distribution and to pay the tax to the Swiss Federal Tax Administration within 30 calendar days of the due date of such distribution. However, the repayment of the nominal value of the shares and any (permissible) repayment of qualifying additional paid-in capital (capital contribution reserves (Reserven aus Kapitaleinlagen)) are not subject to the Withholding Tax.

Swiss resident individuals who hold their shares as private assets (“Resident Private Shareholders”) are in principle eligible for a full refund or credit against income tax of the Withholding Tax if they duly report the underlying income in their income tax return. In addition, (i) corporate and individual shareholders who are resident in Switzerland for tax purposes, (ii) corporate and individual shareholders who are not resident in Switzerland, and who, in each case, hold their shares as part of a trade or business carried on in Switzerland through a permanent establishment with fixed place of business situated in Switzerland for tax purposes and (iii) Swiss resident private individuals who, for income tax purposes, are classified as “professional securities dealers” for reasons of, inter alia, frequent dealing, or leveraged investments, in shares and other securities (collectively, “Domestic Commercial Shareholders”) are in principle eligible for a full refund or credit against income tax of the Withholding Tax if they duly report the underlying income in their income statements or income tax return, as the case may be.

Shareholders who are not resident in Switzerland for tax purposes, and who, during the respective taxation year, have not engaged in a trade or business carried on through a permanent establishment with fixed place of business situated in Switzerland for tax purposes, and who are not subject to corporate or individual income taxation in Switzerland for any other reason (collectively, “Non-Resident Shareholders”) may be entitled to a total or partial refund of the Withholding Tax if the country in which such recipient resides for tax purposes maintains a bilateral treaty for the avoidance of double taxation with Switzerland (“Tax Treaty”) and further conditions of such Tax Treaty are met. Non-Resident Shareholders should be aware that the procedures for claiming treaty benefits (and the time required for obtaining a refund) may differ from country to country. Non-Resident Shareholders should consult their own legal, financial or tax advisors regarding receipt, ownership, purchases, sale or other dispositions of  shares and the procedures for claiming a refund of the Withholding Tax.

Automatic Exchange of Information

Switzerland has concluded a multilateral agreement with the EU on the international automatic exchange of information (“AEOI”) in tax matters (the “AEOI Agreement”), which became effective as of January 1, 2017. Furthermore, on January 1, 2017, the multilateral competent authority agreement on the automatic exchange of financial account information and, based on such agreement, a number of bilateral AEOI agreements with other

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countries became effective. Based on this AEOI Agreement and the bilateral AEOI agreements and the implementing laws of Switzerland, Switzerland collects and exchanges data in respect of financial assets, which may include shares, held in, and income derived thereon and credited to, accounts or deposits with a paying agent in Switzerland for the benefit of residents in a member state or a treaty state.

A list of the AEOI agreements of Switzerland in effect or signed and becoming effective can be found on the website of the State Secretariat for International Financial Matters (https://www.sif.admin.ch/sif/en/home/
multilateral/steuer_informationsaust/automatischer-informationsaustausch/automatischer-informationsaustausch1.html.)

Swiss Federal, Cantonal and Communal Individual Income Tax and Corporate Income Tax

Non-Resident Shareholders

Non-Resident Shareholders are not subject to any Swiss federal, cantonal or communal income tax on dividend payments and similar distributions because of the mere holding of the shares. The same applies for capital gains on the sale of shares.

Resident Private Shareholders and Domestic Commercial Shareholders

Resident Private Shareholders who receive dividends and similar cash or in-kind distributions (including liquidation proceeds as well as stock dividends or taxable repurchases of shares as described above), which are not repayments of the nominal value of the  shares or qualifying additional paid-in capital, are required to report such receipts in their individual income tax returns and are subject to Swiss federal, cantonal and communal income tax on any net taxable income for the relevant tax period. A gain or a loss by Resident Private Shareholders realized upon the sale or other disposition of shares to a third party will generally be a tax-free private capital gain or a not tax-deductible capital loss, as the case may be. Domestic Commercial Shareholders who receive dividends and similar cash or in-kind distributions (including liquidation proceeds as well as bonus shares) are required to recognize such payments in their income statements for the relevant tax period and are subject to Swiss federal, cantonal and communal individual or corporate income tax, as the case may be, on any net taxable earnings accumulated (including the dividends) for such period. Domestic Commercial Shareholders who are corporate taxpayers may qualify for participation relief on dividend distributions (Beteiligungsabzug), if the shares held have a market value of at least CHF 1 million.

Domestic Commercial Shareholders are required to recognize a gain or loss realized upon the disposal of shares in their income statement for the respective taxation period and are subject to Swiss federal, cantonal and communal individual or corporate income tax, as the case may be, on any net taxable earnings (including the gain or loss realized on the sale or other disposition of shares) for such taxation period.

Swiss Wealth Tax and Capital Tax

Non-Resident Shareholders

Non-Resident Shareholders holding the shares are not subject to cantonal and communal wealth or annual capital tax because of the mere holding of the shares.

Resident Private Shareholders and Domestic Commercial Shareholders

Resident Private Shareholders are required to report their shares as part of their private wealth and are subject to cantonal and communal wealth tax. Domestic Commercial Shareholders are required to report their shares as part of their business wealth or taxable capital, as defined, and are subject to cantonal and communal wealth or annual capital tax.

Swiss Facilitation of the Implementation of the U.S. Foreign Account Tax Compliance Act

Switzerland has concluded an intergovernmental agreement with the U.S. to facilitate the implementation of FATCA. The agreement ensures that the accounts held by U.S. persons with Swiss financial institutions are disclosed

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to the U.S. tax authorities either with the consent of the account holder or by means of group requests within the scope of administrative assistance. Information will not be transferred automatically in the absence of consent, and instead will be exchanged only within the scope of administrative assistance on the basis of the double taxation agreement between the U.S. and Switzerland. On October 8, 2014, the Swiss Federal Council approved a mandate for negotiations with the U.S. on changing the current direct notification-based regime to a regime where the relevant information is sent to the Swiss Federal Tax Administration, which in turn provides the information to the U.S. tax authorities.

LEGAL MATTERS

The validity of the securities offered hereby will be passed upon by Homburger AG, Zurich, Switzerland, as to matters of Swiss law.  Certain legal matters in connection with this offering relating to U.S. law will be passed upon for us by Baker Botts L.L.P., Houston, Texas.  The selling securityholders and any underwriters will be advised about matters relating to any offering by their own legal counsel.

EXPERTS

The consolidated financial statements of Transocean Ltd. and subsidiaries appearing in Transocean Ltd.’s Annual Report (Form 10-K) for the year ended December 31, 2023 (including the schedule appearing therein), and the effectiveness of Transocean Ltd. and subsidiaries’s internal control over financial reporting as of December 31, 2023, have been audited by Ernst & Young LLP, independent registered public accounting firm, as set forth in their reports thereon, included therein, and incorporated herein by reference.  Such consolidated financial statements are incorporated herein by reference in reliance upon such reports given on the authority of such firm as experts in accounting and auditing.

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PART II

INFORMATION NOT REQUIRED IN PROSPECTUS

The following table sets forth the estimated expenses payable by Transocean Ltd. in connection with the sale of the securities being registered.

* Calculated based on the number of issuances and amount of securities offered and, accordingly, cannot be estimated at this time.

The registrant believes, based on the interpretation of leading Swiss legal scholars, which is a persuasive authority in Switzerland, that, under Swiss law, it may indemnify its directors and officers unless the indemnification results from a breach of their duties that constitutes gross negligence or intentional breach of duty of the director or officer concerned.  Article 24 of the registrant’s articles of association makes indemnification of directors and officers and advancement of expenses to defend claims against directors and officers mandatory on the part of the registrant’s to the fullest extent allowed by law.  Under the registrant’s articles of association, a director or officer may not be indemnified if such person is found, in a final judgment or decree not subject to appeal, to have committed an intentional or grossly negligent breach of his or her statutory duties as a director or officer.  Swiss law permits the registrant, or each director or officer individually, to purchase and maintain insurance on behalf of such directors and officers.

The registrant may obtain such insurance from one or more third-party insurers or captive insurance companies.  The registrant has also entered into indemnification agreements with each of its directors and certain of its executive officers that provide for indemnification and expense advancement and include related provisions meant to facilitate the indemnitee’s receipt of such benefits.  The agreements provide that the registrant will indemnify each such director and executive officer if such director or executive officer acted in good faith and reasonably believed he or she was acting in the best interest of the registrant and, in addition, with respect to any criminal proceeding, he or she had no reasonable cause to believe that his or her conduct was unlawful.  The agreements provide that expense advancement is provided subject to an undertaking by the indemnitee to repay amounts advanced if it is ultimately determined that he or she is not entitled to indemnification.  The disinterested members of the registrant’s board of directors or an independent counsel will determine whether indemnification payment should be made in any particular instance.  In making such determination, the board of directors or the independent counsel, as the case may be, must presume that the indemnitee is entitled to such indemnification, and the registrant has the burden of proof in seeking to overcome such presumption.  If the board of directors or the independent counsel determines that the director or executive officer is not entitled to indemnification, the agreements provide that such person is entitled to seek an award in arbitration with respect to his or her right to indemnification under his agreement.

The rights and authority conferred by Article 24 of the registrant’s articles of association and by the indemnification agreement described above are not exclusive of any other right that any person has or hereafter acquires under any law, provision of the registrant’s articles of association, organizational regulations, agreement, vote of shareholders or of the registrant’s board of directors or otherwise.

The registrant also has directors’ and officers’ liability insurance that would indemnify its directors and officers against damages arising out of certain kinds of claims that might be made against them while acting in their

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capacity as such.  The registrant may obtain such insurance from one or more third party or captive insurance companies.

General

Agreements that may be entered into with underwriters, dealers and agents who participate in the distribution of our securities may contain provisions relating to the indemnification of our officers and directors.

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The undersigned registrant hereby undertakes:

provided, however, that paragraphs (i), (ii) and (iii) above do not apply if the information required to be included in a post-effective amendment by those paragraphs is contained in reports filed with or furnished to the SEC by the registrant pursuant to Sections 13 or 15(d) of the Securities Exchange Act of 1934, as amended, that are incorporated by reference in the registration statement, or is

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contained in a form of prospectus filed pursuant to Rule 424(b) that is part of the registration statement.

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Insofar as indemnification for liabilities arising under the Securities Act may be permitted to directors, officers and controlling persons of the registrant pursuant to the foregoing provisions, or otherwise, the registrant has been advised that in the opinion of the SEC such indemnification is against public policy as expressed in the Securities Act and is, therefore, unenforceable.  In the event that a claim for indemnification against such liabilities (other than the payment by the registrant of expenses incurred or paid by a director, officer or controlling person of the registrant in the successful defense of any action, suit or proceeding) is asserted by such director, officer or controlling person in connection with the securities being registered, the registrant will, unless in the opinion of its counsel the matter has been settled by controlling precedent, submit to a court of appropriate jurisdiction the question whether such indemnification by it is against public policy as expressed in the Securities Act and will be governed by the final adjudication of such issue.

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SIGNATURES

Pursuant to the requirements of the Securities Act of 1933, the registrant certifies that it has reasonable grounds to believe that it meets all of the requirements for filing on Form S-3 and has duly caused this registration statement to be signed on its behalf by the undersigned, thereunto duly authorized, in the City of Houston, State of Texas, on June 28, 2024.

TRANSOCEAN LTD.

By:/s/Jeremy D. Thigpen

Name:Jeremy D. Thigpen

Title:Chief Executive Officer

KNOW ALL PERSONS BY THESE PRESENTS, that each person whose signature appears below constitutes and appoints Jeremy D. Thigpen, R. Thaddeus Vayda, Brady K. Long, Sandro Thoma and Daniel Ro-Trock, with full power to act alone, as his or her true and lawful attorneys-in-fact and agents, with full power of substitution and resubstitution, for him or her and in his or her name, place and stead, in any and all capacities, to sign any and all amendments (including post-effective amendments) to this registration statement and any subsequent registration statement filed by the registrant pursuant to Rule 462(b) of the Securities Act, and to file the same, with all exhibits thereto, and other documents in connection therewith, with the Securities and Exchange Commission, granting unto said attorneys-in-fact and agents, and each of them, full power and authority to do and perform each and every act and thing requisite and necessary to be done in connection therewith, as fully to all intents and purposes as he or she might or could do in person, hereby ratifying and confirming all that said attorneys-in-fact and agents, or any of them, or their or his substitute or substitutes, may lawfully do or cause to be done by virtue hereof.  This Power of Attorney may be executed in multiple counterparts, each of which shall be deemed an original, but which taken together, shall constitute one instrument.

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Pursuant to the requirements of the Securities Act of 1933, this registration statement has been signed below by the following persons in the capacities and on the dates indicated.

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Exhibit 5.1

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Transocean Ltd.

We, Homburger AG, have acted as special Swiss counsel to Transocean Ltd., a Swiss corporation (the Company), in connection with the Registration Statement on Form S−3 (the Registration Statement), to be filed with the United States Securities and Exchange Commission (the Commission) on the date hereof under the Securities Act of 1933, as amended (the Act), relating to the registration of 55,513,043 registered shares (Namenaktien), par value USD 0.10 each, of the Company (the Shares) already in issue, 34,699,568 of which are held by Hayfin Special Opportunities Fund II LP, 1,023,578 of which are held by Hayfin Topaz LP, 14,842,476 of which are held by Hayfin Opal III LP, and 4,947,421 of which are held by Hayfin SOF II USD Co-Invest LP (Hayfin Special Opportunities Fund II LP, Hayfin Topaz LP, Hayfin Opal III LP and Hayfin SOF II USD Co-Invest LP collectively, the Selling Securityholders, and the Shares in issue and held by the Selling Securityholders hereinafter referred to collectively as the Registration Shares). The Registration Statement contains a prospectus that has been prepared in accordance with the Act (the Prospectus).

The Selling Securityholders may offer and sell, from time to time, Registration Shares in one or more offerings at prices and on terms that will be determined at the time of the offering.

As special Swiss counsel to the Company, we have been requested to give our opinion as to certain legal matters under Swiss law.

Capitalized terms used but not defined herein shall have the meanings assigned to such terms in the Documents (as defined below) unless otherwise defined herein.

This opinion is confined to and given on the basis of the laws of Switzerland in force at the date hereof. Such laws and the interpretation thereof are subject to change. This opinion is also confined to the matters stated herein and the Documents (as defined below), and is not to be read as extending, by implication or otherwise, to any agreement or document referred to in any of the Documents (including in the case of the Registration Statement, the Prospectus and any document incorporated by reference therein or exhibit thereto) or any other matter.

For purposes of this opinion, we have not conducted any due diligence or similar investigation as to factual circumstances, which are or may be referred to in the Documents, we express no

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opinion as to the accuracy of representations and warranties of facts set out in the Documents or the factual background assumed therein, and we relied on the accuracy and completeness of the statements and the information contained therein.

For purposes of giving this opinion, we have only examined originals or copies of the following documents (collectively, the Documents):

No documents have been reviewed by us in connection with this opinion other than the Documents. Accordingly, we shall limit our opinion to the Documents and their legal implications under Swiss law.

In this opinion, Swiss legal concepts are expressed in English terms and not in their original language. These concepts may not be identical to the concepts described by the same English terms as they exist under the laws of other jurisdictions. With respect to Documents governed by laws other than the laws of Switzerland, for purposes of this opinion we have relied on the plain meaning of the words and expressions contained therein without regard to any import they may have under the relevant governing law.

In rendering the opinion below, we have assumed the following:

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Based on the foregoing and subject to the qualifications set out below, we are of the opinion as of the date hereof:

The above opinions are subject to the following qualifications:

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rights in accordance with the provisions of, and subject to the limitations provided in, the Articles.

_________

We have issued this opinion as of the date hereof and we assume no obligation to advise you of any changes in fact or in law that are made or brought to our attention thereafter.

We hereby consent to the filing of this opinion as an exhibit to the Registration Statement and to the reference to us under the heading "Legal Matters" in the Prospectus. In giving such consent, we do not thereby admit that we are in the category of persons whose consent is required pursuant to Section 7 of the Act.

This opinion shall be governed by and construed in accordance with the laws of Switzerland.

Sincerely yours,

HOMBURGER AG

/s/ David Oser​ ​​ ​
David Oser

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Exhibit 23.2

Consent of Independent Registered Public Accounting Firm

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We consent to the reference to our firm under the caption “Experts” in the Registration Statement (Form S-3) and related Prospectus of Transocean Ltd. for the registration of 55,513,043 shares of its common stock and to the incorporation by reference therein of our reports dated February 20, 2024, with respect to the consolidated financial statements and schedule of Transocean Ltd. and subsidiaries and the effectiveness of internal control over financial reporting of Transocean Ltd. and subsidiaries included in its Annual Report (Form 10-K) for the year ended December 31, 2023, filed with the Securities and Exchange Commission.

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/s/ Ernst & Young LLP

Houston, Texas
June 28, 2024

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Exhibit 107

Calculation of Filing Fee Tables

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Form S-3ASR

(Form Type)

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Transocean Ltd.

(Exact Name of Registrant as Specified in its Charter)

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Table 1: Newly Registered and Carry Forward Securities

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