Filed Pursuant to Rule 424(b)(5)
Registration No. 333-210284

This preliminary prospectus supplement relates to an effective registration statement under the Securities Act of 1933, as amended, but is not complete and may be changed. This preliminary prospectus supplement and the accompanying base prospectus are not an offer to sell these securities in any jurisdiction where the offer or sale is not permitted and they are not soliciting an offer to buy these securities in any jurisdiction where the offer or sale is not permitted.

SUBJECT TO COMPLETION, DATED NOVEMBER 28, 2017

PRELIMINARY PROSPECTUS SUPPLEMENT

(To Prospectus dated March 18, 2016)

30,000,000 Common Shares

Scorpio Tankers Inc.

Scorpio Tankers Inc. is offering 30,000,000 of its common shares pursuant to this prospectus supplement. Scorpio Services Holding Limited has indicated an interest to purchase at least $20 million of common shares at the public offering price.

Our common shares are listed on the New York Stock Exchange, or the NYSE, under the symbol “STNG.” On November 27, 2017, the last reported sale price of our common shares on the NYSE was $3.31 per share.

Investing in our common shares involves risks. You should carefully consider each of the factors described under “Risk Factors ” beginning on page S-11 of this prospectus supplement, on page 4 of the accompanying base prospectus and in the documents incorporated by reference into this prospectus supplement and the accompanying base prospectus, before you make any investment in our common shares.

Neither the U.S. Securities and Exchange Commission, or the Commission, nor any state securities commission has approved or disapproved of these securities, or determined if this prospectus supplement or the accompanying base prospectus is truthful or complete. Any representation to the contrary is a criminal offense.

PRICE $            PER SHARE

We expect to grant the underwriters an option for a period of 30 days to purchase up to 4,500,000 additional common shares from us on the same terms and conditions as set forth above. If the underwriters exercise the option in full, the total underwriting discounts will be $        , and the total proceeds to us, before expenses, will be $            .

The underwriters are offering the common shares as set forth in the section of this prospectus supplement entitled “Underwriting.” Delivery of the common shares will be made on or about                     , 2017.

Lead Underwriter & Bookrunner

Clarksons Platou Securities

Joint Lead Managers & Bookrunners

Co-Managers

Prospectus Supplement dated                     , 2017

TABLE OF CONTENTS

Prospectus Supplement

Base Prospectus

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ABOUT THIS PROSPECTUS SUPPLEMENT

This prospectus supplement and the accompanying prospectus are part of a registration statement that we filed with the Commission utilizing a “shelf” registration process. This document is in two parts. The first part is this prospectus supplement, which describes the specific terms of this offering of common shares and also adds to and updates information contained in the accompanying base prospectus and the documents incorporated by reference into this prospectus supplement and the base prospectus. The second part, the base prospectus, gives more general information about securities we may offer from time to time, some of which does not apply to this offering. Generally, when we refer only to the prospectus, we are referring to both parts combined, and when we refer to the accompanying prospectus, we are referring to the base prospectus.

If the description of this offering varies between this prospectus supplement and the accompanying base prospectus, you should rely on the information in this prospectus supplement. This prospectus supplement, the accompanying base prospectus and the documents incorporated into each by reference include important information about us, the common shares being offered and other information you should know before investing. You should read this prospectus supplement and the accompanying base prospectus together with additional information described under the heading, “Where You Can Find Additional Information” before investing in our common shares.

We prepare our financial statements, including all of the financial statements incorporated by reference in this prospectus supplement, in U.S. dollars and in accordance with International Financial Reporting Standards, or IFRS, as issued by the International Accounting Standards Board, or IASB. We have a fiscal year end of December 31.

We have authorized only the information contained or incorporated by reference in this prospectus supplement, the accompanying base prospectus and any free writing prospectus prepared by or on behalf of us or to which we have referred you. We have not, and the underwriters have not, authorized anyone to provide you with information that is different. We and the underwriters take no responsibility for, and can provide no assurance as to the reliability of, any information that others may give you. We are offering to sell, and seeking offers to buy, our common shares only in jurisdictions where offers and sales are permitted. The information contained in or incorporated by reference in this document is accurate only as of the date such information was issued, regardless of the time of delivery of this prospectus supplement or any sale of our common shares.

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CAUTIONARY STATEMENT REGARDING FORWARD LOOKING STATEMENTS

The Private Securities Litigation Reform Act of 1995 provides safe harbor protections for forward-looking statements in order to encourage companies to provide prospective information about their business. Forward-looking statements include statements concerning plans, objectives, goals, strategies, future events or performance, and underlying assumptions and other statements, which are other than statements of historical facts.

This document includes assumptions, expectations, projections, intentions and beliefs about future events. These statements are intended as “forward-looking statements.” We desire to take advantage of the safe harbor provisions of the Private Securities Litigation Reform Act of 1995 and are including this cautionary statement in connection therewith. This document and the documents incorporated by reference herein and any other written or oral statements made by us or on our behalf may include forward-looking statements, which reflect our current views with respect to future events and financial performance, and are not intended to give any assurance as to future results or events. We caution that assumptions, expectations, projections, intentions and beliefs about future events may and often do vary from actual results and the differences can be material. When used in this document, the words “believe,” “expect,” “anticipate,” “estimate,” “intend,” “plan,” “target,” “project,” “likely,” “may,” “will,” “would,” “could” and similar expressions, terms, or phrases may identify forward-looking statements.

The forward-looking statements in this document and the documents incorporated by reference herein are based upon various assumptions, many of which are based, in turn, upon further assumptions, including without limitation, management’s examination of historical operating trends, data contained in our records and other data available from third parties. Although we believe that these assumptions were reasonable when made, because these assumptions are inherently subject to significant uncertainties and contingencies which are difficult or impossible to predict and are beyond our control, we cannot assure you that we will achieve or accomplish these expectations, beliefs or projections.

In addition to important factors and matters discussed elsewhere in this prospectus supplement, the accompanying prospectus, and the documents incorporated into each by reference, important factors that, in our view, could cause our actual results to differ materially from those discussed in the forward-looking statements include:

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These factors and the other risk factors described in this prospectus supplement, the accompanying base prospectus, and the documents incorporated by reference into each, are not necessarily all of the important factors that could cause actual results or developments to differ materially from those expressed in any of our forward-looking statements. Other unknown or unpredictable factors also could harm our results. Consequently, there can be no assurance that actual results or developments anticipated by us will be realized or, even if substantially realized, that they will have the expected consequences to, or effects on, us. These forward-looking statements are not guarantees of our future performance, and actual results and future developments may vary materially from those projected in the forward-looking statements. Given these uncertainties, prospective investors are cautioned not to place undue reliance on such forward-looking statements, which speak only as of their dates. We undertake no obligation, and specifically decline any obligation, except as required by law, to publicly update or revise any forward-looking statements, whether as a result of new information, future events or otherwise. For a discussion of these risks and uncertainties, please see the section of this prospectus supplement entitled “Risk Factors.”

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RISK FACTORS

An investment in our common shares involves a high degree of risk. Before making an investment in our common shares, you should carefully consider the risk factors and all of the other information included in this prospectus supplement, the accompanying base prospectus and the documents incorporated into each by reference, including those in “Item 3. Key Information—D. Risk Factors” in our Annual Report on Form 20-F for the year ended December 31, 2016, filed with the Commission on March 16, 2017, as updated by annual, quarterly and other reports and documents we file with the Commission after the date of this prospectus supplement and that are incorporated by reference herein. Please see the section of this prospectus supplement entitled “Where You Can Find Additional Information—Information Incorporated by Reference.” The occurrence of one or more of those risk factors could adversely impact our business, financial condition or results of operations.

The unaudited pro forma condensed combined financial information of Scorpio Tankers and NPTI incorporated by reference herein is presented for illustrative purposes only and may not be indicative of our results of operations or financial condition following the Merger.

The unaudited pro forma condensed consolidated financial information incorporated by reference in this prospectus supplement has been prepared using the consolidated historical financial statements of Scorpio Tankers and NPTI, is presented for illustrative purposes only and should not be considered to be an indication of our results of operations or financial condition following the Merger. In addition, the pro forma combined financial information incorporated by reference in this prospectus supplement is based in part on certain assumptions at that time regarding the Merger. These assumptions may not prove to be accurate, and other factors may affect our results of operations or financial condition following the Merger. Accordingly, the historical and pro forma financial information incorporated by reference in this prospectus supplement does not necessarily represent our results of operations and financial condition had Scorpio Tankers and NPTI operated as a combined entity during the period presented, or of our results of operations and financial condition following completion of the Merger. Our potential for future business success and operating profitability must be considered in light of the risks, uncertainties, expenses and difficulties typically encountered following mergers.

We may not realize all of the anticipated benefits of our recent Merger with NPTI.

There is a risk that some or all of the expected benefits of our recent Merger with NPTI may fail to materialize, or may not occur within the time periods anticipated. The realization of such benefits may be affected by a number of factors, many of which are beyond our control, including but not limited to the strength or weakness of the economy and competitive factors in the areas where we do business, the effects of competition in the markets in which we operate, and the impact of changes in the laws and regulations regulating the seaborne transportation or refined petroleum products industries or affecting domestic or foreign operations. The challenge of coordinating previously separate businesses makes evaluating our business and future financial prospects following the Merger difficult. Our ability to realize anticipated benefits and cost savings will depend, in part, on our ability to successfully integrate the operations of both companies in a manner that results in various benefits, including, among other things, an expanded market reach and operating efficiencies, and that does not materially disrupt existing relationships nor result in decreased revenues or dividends. The past financial performance of each of Scorpio Tankers and NPTI may not be indicative of their future financial performance. Realization of the anticipated benefits of the Merger will depend, in part, on our ability to successfully integrate our business. We have devoted, and expect to continue to devote, significant management attention and resources to integrating business practices and support functions. The diversion of management’s attention and any delays or difficulties encountered in connection with the Merger and the coordination of the two companies’ operations could have an adverse effect on our business, financial results, financial condition or our share price. The coordination process may also result in additional and unforeseen expenses.

Failure to realize all of the anticipated benefits of the Merger may impact our financial performance, the price of our common shares and our ability to pay dividends on its common shares. The declaration of dividends by us is subject to the discretion of our board of directors.

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The price of our common shares after this offering may be volatile.

The price of our common shares may fluctuate due to factors such as:

The seaborne transportation industry has been highly unpredictable and volatile. The market for our common shares in this industry may be equally volatile. Consequently, you may not be able to sell the common shares at prices equal to or greater than those paid by you in this offering.

We may issue additional common shares or other equity securities without your approval, which would dilute your ownership interests and may depress the market price of our common shares.

We may issue additional common shares or other equity securities of equal or senior rank in the future in connection with, among other things, future vessel acquisitions, repayment of outstanding indebtedness, or our equity incentive plan, without shareholder approval, in a number of circumstances.

Our issuance of additional common shares or other equity securities of equal or senior rank would have the following effects:

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USE OF PROCEEDS

We estimate that we will receive net proceeds of approximately $        million from this offering assuming the underwriters’ option to purchase additional shares is not exercised, and approximately $        million if the underwriters’ option to purchase additional shares is exercised in full, in each case after deducting underwriting discounts and estimated offering expenses payable by us.

We intend to use all of the net proceeds of this offering of our common shares to strengthen our balance sheet and for general corporate purposes.

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CAPITALIZATION

The following table sets forth our capitalization at September 30, 2017, on:

There have been no other material adjustments to our capitalization since September 30, 2017, as so adjusted.

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You should read the information below in connection with the section of this prospectus supplement entitled “Use of Proceeds” as well as the consolidated financial statements and related notes for the year ended December 31, 2016, filed with the Commission on March 16, 2017, and our Report on Form 6-K containing our Management’s Discussion and Analysis of Financial Condition and Results of Operations and unaudited consolidated financial statements and related notes thereto for the nine months ended September 30, 2017, filed with the Commission on November 28, 2017, each of which is incorporated by reference herein.

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DILUTION

Dilution or accretion is the amount by which the offering price paid by the purchasers of our common shares in this offering will differ from the net tangible book value per common share after the offering. The net tangible book value is equal to the amount of our total tangible assets (total assets less intangible assets) less total liabilities. The historical net tangible book value and the as adjusted(1) net tangible book value as of September 30, 2017 were $1.6 billion in total and $5.74 per share for the number of shares of the existing shareholders at that date.

The as further adjusted net tangible book value as of September 30, 2017 would have been $        , or $        per common share after the issuance and sale by us of                common shares at $        per share in this offering, after deducting estimated expenses related to this offering. This represents an immediate increase in net tangible book value of $        per share to the existing shareholders and an immediate dilution in net tangible book value of $        per share to new investors.

The following table illustrates the pro forma per share dilution and increase in net tangible book value as of September 30, 2017:

The following table summarizes, as of September 30, 2017, on an as adjusted basis for this public offering, the difference between the number of common shares acquired from us, the total amount paid and the average price per share paid by the existing shareholders and the number of common shares acquired from us, the total amount paid and the average price per share paid by you as a new investor in this offering, based upon the public offering price of $        per share.

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DESCRIPTION OF CAPITAL STOCK

The following is a summary of the description of our capital stock and the material terms of our amended and restated articles of incorporation and bylaws. Because the following is a summary, it does not contain all of the information that you may find useful. For more complete information, you should read the description of capital stock and the material terms of our amended and restated articles of incorporation and amended and restated bylaws contained in our Annual Report on Form 20-F, filed with the Commission on March 16, 2017, as updated by annual and other reports and documents we file with the Commission after the date of this prospectus supplement and that are incorporated by reference herein, together with our amended and restated articles of incorporation and amended and restated bylaws, copies of which have been filed as exhibits thereto. Please see the section of this prospectus supplement entitled “Where You Can Find Additional Information.”

Purpose

Our purpose, as stated in our amended and restated articles of incorporation, is to engage in any lawful act or activity for which corporations may now or hereafter be organized under the BCA. Our amended and restated articles of incorporation and amended and restated bylaws do not impose any limitations on the ownership rights of our shareholders.

Authorized Capitalization

Under our amended and restated articles of incorporation, as amended, we have authorized 425,000,000 registered shares, consisting of 400,000,000 common shares, par value $0.01 per share, of which 281,095,745 shares were issued and outstanding as of November 24, 2017, and 25,000,000 preferred shares, par value $0.01 per share, of which no shares are issued and outstanding as of November 24, 2017.

Description of Common Shares

Each outstanding common share entitles the holder to one vote on all matters submitted to a vote of shareholders. Subject to preferences that may be applicable to any outstanding preferred shares, holders of our common shares are entitled to receive ratably all dividends, if any, declared by our board of directors out of funds legally available for dividends. Upon our dissolution or liquidation or the sale of all or substantially all of our assets, after payment in full of all amounts required to be paid to creditors and to the holders of preferred stock having liquidation preferences, if any, the holders of our common shares are entitled to receive pro rata our remaining assets available for distribution. Holders of our common shares do not have conversion, redemption or pre-emptive rights to subscribe to any of our securities. The rights, preferences and privileges of holders of our common shares are subject to the rights of the holders of any preferred shares, which we may issue in the future.

Description of Preferred Shares

Our amended and restated articles of incorporation authorize our board of directors to establish one or more series of preferred stock and to determine, with respect to any series of preferred stock, the terms and rights of that series, including the designation of the series, the number of shares of the series, the preferences and relative, participating, option or other special rights, if any, and any qualifications, limitations or restrictions of such series, and the voting rights, if any, of the holders of the series.

Registrar and Transfer Agent

The registrar and transfer agent for our common shares is Computershare Trust Company, N.A.

Listing

Our common shares are listed on the NYSE under the symbol “STNG.”

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BENEFICIAL OWNERSHIP OF OUR COMMON SHARES

The following table sets forth information regarding the beneficial ownership of our common shares, as of November 24, 2017, held by each person or entity that we know beneficially owns 5% or more of our common shares and each of our executive officers and directors.

Beneficial ownership is determined in accordance with the Commission’s rules. All of our shareholders, including the shareholders listed in the table below, are entitled to one vote for each common share held.

As of November 22, 2017, we had 281,095,745 outstanding shares and 61 shareholders of record, 14 of which were located in the United States and held an aggregate of 271,596,679 of our common shares, representing 96.6% of our outstanding common shares. However, one of the U.S. shareholders of record is CEDE & CO., a nominee of The Depository Trust Company, which held 264,941,541 of our common shares as of November 22, 2017. Accordingly, we believe that the shares held by CEDE & CO. include common shares beneficially owned by both holders in the United States and non-U.S. beneficial owners. We are not aware of any arrangements the operation of which may at a subsequent date result in our change of control.

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PRICE RANGE OF COMMON SHARES

Our common shares are listed on the NYSE under the symbol “STNG.” The table below sets forth, for the periods indicated, the per share high and low sales prices for our common shares as reported on the NYSE.

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UNDERWRITING

Subject to the terms and conditions stated in the underwriting agreement dated the date of this prospectus supplement, the underwriters named below have severally agreed to purchase from us the following respective number of common shares at a public offering price less the underwriting discounts set forth on the cover page of this prospectus supplement.

Clarksons Platou Securities AS and Pareto Securities AS are not US registered broker-dealers and, therefore, intend to participate in the offering outside of the United States and, to the extent that any offering by Clarksons Platou Securities AS or Pareto Securities AS is within the United States, Clarksons Platou Securities AS will offer to and place securities with investors through Clarksons Platou Securities, Inc., an affiliated US broker-dealer, and Pareto Securities AS will offer to and place securities with investors through Pareto Securities Inc., an affiliated US broker-dealer. The activities of Clarksons Platou Securities AS and Pareto Securities AS in the United States will, in each case, be effected only to the extent permitted by Rule 15a-6 under the Securities Exchange Act of 1934, as amended.

The underwriting agreement provides that the obligations of the several underwriters to purchase the common shares offered hereby are subject to certain conditions precedent and that the underwriters will purchase all of the common shares offered by this prospectus supplement.

The underwriters propose to offer the common shares to the public at the public offering price set forth on the cover of this prospectus supplement. If all the common shares are not sold at the public offering price, the underwriters may change the offering price and may offer common shares from time to time for sale in negotiated transactions or otherwise, at market prices prevailing at the time of sale, at prices related to such prevailing market prices or at negotiated prices, subject to receipt and acceptance by it and subject to its right to reject any order in whole or in part.

We expect to grant to the underwriters an option, exercisable not later than 30 days after the date of this prospectus supplement, to purchase up to 4,500,000 additional common shares at the public offering price less the underwriting discounts and commissions set forth on the cover page of this prospectus supplement. To the extent that the underwriters exercise this option, each of the underwriters will become obligated, subject to conditions, to purchase approximately the same percentage of these additional common shares as the number of common shares to be purchased by it in the above table bears to the total number of common shares offered by this prospectus supplement. We will be obligated, pursuant to the option, to sell these additional common shares to the underwriters to the extent the option is exercised.

Our common shares are listed and traded on the NYSE under the symbol “STNG.”

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The underwriting discounts and commissions per share are equal to the public offering price per common share less the amount paid by the underwriters to us per common share. The underwriting discounts and commissions are     % of the initial public offering price. We have agreed to pay the underwriters the following discounts and commissions, assuming either no exercise or full exercise by the underwriters of the underwriters’ option to purchase additional shares:

In addition, we estimate that our share of the total expenses of this offering, excluding underwriting discounts and commissions, will be approximately $        . We have also agreed to reimburse the underwriters for certain of their expenses, as set forth in the underwriting agreement, including legal fees incurred in the qualification of the offering with FINRA, in an amount of up to $        , which amount is deemed by FINRA to be underwriting compensation.

Other than as set forth below, we, each of our executive officers and directors have agreed not to offer, sell, contract to sell or otherwise dispose of, or enter into any transaction that is designed to, or could be expected to, result in the disposition of any common shares or other securities convertible into or exchangeable or exercisable for common shares or derivatives of our common shares owned by these persons prior to this offering or common shares issuable upon exercise of options or warrants held by these persons for a period of 45 days after the date of this prospectus supplement, or the “Restricted Period,” without the prior written consent of Clarksons Platou Securities, Inc. This consent may be given at any time without public notice except in limited circumstances. The restrictions described above do not apply to:

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There are no agreements between Clarksons Platou Securities, Inc. and any of our shareholders or affiliates releasing them from these lock-up agreements prior to the expiration of the lock-up periods described above.

The underwriters may impose a penalty bid. This occurs when a particular underwriter repays to the other underwriters a portion of the underwriting discount received by it because the representative of the underwriters has repurchased shares sold by or for the account of that underwriter in stabilizing or short covering transactions.

Purchases to cover a short position and stabilizing transactions may have the effect of preventing or slowing a decline in the market price of our common shares. Additionally, these purchases, along with the imposition of the penalty bid, may stabilize, maintain or otherwise affect the market price of our common shares. As a result, the price of our common shares may be higher than the price that might otherwise exist in the open market. These transactions may be effected on the NYSE, in the over-the-counter market or otherwise.

A prospectus in electronic format is being made available on an Internet web site maintained by the lead underwriter of this offering and may be made available on web sites maintained by other underwriters. Other than the prospectus in electronic format, the information on any underwriter’s web site and any information contained in any other web site maintained by an underwriter is not part of the prospectus or the registration statement of which the prospectus forms a part.

We have agreed to indemnify the underwriters against certain liabilities, including liabilities under the Securities Act of 1933, as amended, or to contribute to payments the underwriters may be required to make because of any of those liabilities.

Notice to Investors in the European Economic Area

In relation to each Member State of the European Economic Area which has implemented the Prospectus Directive (each, a Relevant Member State) an offer to the public of any common shares which are the subject of this offering contemplated by this prospectus may not be made in that Relevant Member State other than the offers contemplated in the prospectus once the prospectus has been approved by the competent authority in such Member State and published and passported in accordance with the Prospectus Directive as implemented in the Relevant Member State except that an offer to the public in that Relevant Member State of any common shares may be made at any time under the following exemptions under the Prospectus Directive, if they have been implemented in that Relevant Member State:

provided that no such offer of common shares shall result in a requirement for the publication by the Issuer or any underwriter of a prospectus pursuant to Article 3 of the Prospectus Directive.

For the purposes of this provision, the expression an “offer to the public” in relation to any common shares in any Relevant Member State means the communication in any form and by any means of sufficient information

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on the terms of the offer and any common shares to be offered so as to enable an investor to decide to purchase any common shares, as the same may be varied in that member state by any measure implementing the Prospectus Directive in that member state and the expression “Prospectus Directive” means Directive 2003/71/EC and includes any relevant implementing measure in each Relevant Member State.

Notice to Investors in the United Kingdom

Each underwriter has represented and agreed that (i) it has not offered or sold and, prior to the expiration of the period of six months from the closing date of this offering, will not offer or sell any common shares to persons in the United Kingdom except to persons whose ordinary activities involve them in acquiring, holding, managing or disposing of investments (as principal or agent) for the purposes of their businesses or otherwise in circumstances which have not resulted and will not result in an offer to the public in the United Kingdom within the meaning of the Public Offers of Securities Regulations 1995; (ii) it has complied with and will comply with all applicable provisions of the Financial Services Act 1986 with respect to anything done by it in relation to the shares of our common stock in, from or otherwise involving the United Kingdom; and (iii) it has only issued or passed on and will only issue or pass on in the United Kingdom, any document received by it in connection with the issue of the shares of our common stock to a person who is of a kind described in Article 11(3) of the Financial Services Act 1986 (Investment Advertisements) (Exemptions) Order 1996 or is a person to whom such document may otherwise lawfully be issued or passed on.

Notice to Investors in Canada

This document constitutes an “exempt offering document” as defined in and for the purposes of applicable Canadian securities laws. No prospectus has been filed with any securities commission or similar regulatory authority in Canada in connection with the offer and sale of the shares. No securities commission or similar regulatory authority in Canada has reviewed or in any way passed upon this document or on the merits of the shares and any representation to the contrary is an offence.

Canadian investors are advised that this document has been prepared in reliance on section 3A.3 of National Instrument 33-105 Underwriting Conflicts (“NI 33-105”). Pursuant to section 3A.3 of NI 33-105, this document is exempt from the requirement that the Company and the underwriters provide Canadian investors with certain conflicts of interest disclosure pertaining to “connected issuer” and/or “related issuer” relationships that may exist between the Company and the underwriters as would otherwise be required pursuant to subsection 2.1(1) of NI 33-105.

Resale Restrictions

The offer and sale of the shares in Canada is being made on a private placement basis only and is exempt from the requirement that the Company prepares and files a prospectus under applicable Canadian securities laws. Any resale of shares acquired by a Canadian investor in this offering must be made in accordance with applicable Canadian securities laws, which may vary depending on the relevant jurisdiction, and which may require resales to be made in accordance with Canadian prospectus and registration requirements, a statutory exemption from the prospectus and registration requirements, in a transaction exempt from the prospectus and registration requirements or otherwise under a discretionary exemption from the prospectus and registration requirements granted by the applicable local Canadian securities regulatory authority. These resale restrictions may under certain circumstances apply to resales of the shares outside of Canada.

Representations of Purchasers

Each Canadian investor who purchases the shares will be deemed to have represented to the Company, the underwriters and to each dealer from whom a purchase confirmation is received, as applicable, that the investor (i) is purchasing as principal, or is deemed to be purchasing as principal in accordance with applicable Canadian

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securities laws, for investment only and not with a view to resale or redistribution; (ii) is an “accredited investor” as such term is defined in section 1.1 of National Instrument 45-106 Prospectus Exemptions or, in Ontario, as such term is defined in section 73.3(1) of the Securities Act (Ontario); and (iii) is a “permitted client” as such term is defined in section 1.1 of National Instrument 31-103 Registration Requirements, Exemptions and Ongoing Registrant Obligations.

Taxation and Eligibility for Investment

Any discussion of taxation and related matters contained within this document does not purport to be a comprehensive description of all of the tax considerations that may be relevant to a Canadian investor when deciding to purchase the shares and, in particular, does not address any Canadian tax considerations. No representation or warranty is hereby made as to the tax consequences to a resident, or deemed resident, of Canada of an investment in the shares or with respect to the eligibility of the shares for investment by such investor under relevant Canadian federal and provincial legislation and regulations.

Rights of Action for Damages or Rescission

Securities legislation in certain of the Canadian jurisdictions provides certain purchasers of securities pursuant to an offering memorandum, including where the distribution involves an “eligible foreign security” as such term is defined in Ontario Securities Commission Rule 45-501 Ontario Prospectus and Registration Exemptions and in Multilateral Instrument 45-107 Listing Representation and Statutory Rights of Action Disclosure Exemptions, as applicable, with a remedy for damages or rescission, or both, in addition to any other rights they may have at law, where the offering memorandum, or other offering document that constitutes an offering memorandum, and any amendment thereto, contains a “misrepresentation” as defined under applicable Canadian securities laws. These remedies, or notice with respect to these remedies, must be exercised or delivered, as the case may be, by the purchaser within the time limits prescribed under, and are subject to limitations and defences under, applicable Canadian securities legislation. In addition, these remedies are in addition to and without derogation from any other right or remedy available at law to the investor.

Language of Documents

Upon receipt of this document, each Canadian investor hereby confirms that it has expressly requested that all documents evidencing or relating in any way to the sale of the securities described herein (including for greater certainty any purchase confirmation or any notice) be drawn up in the English language only. Par la réception de ce document, chaque investisseur canadien confirme par les présentes qu’il a expressément exigé que tous les documents faisant foi ou se rapportant de quelque manière que ce soit à la vente des valeurs mobilières décrites aux présentes (incluant, pour plus de certitude, toute confirmation d’achat ou tout avis) soient rédigés en anglais seulement.

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EXPENSES

The following are the estimated expenses of the issuance and distribution of the securities being registered under the registration statement of which this prospectus supplement forms a part, all of which will be paid by us.

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LEGAL MATTERS

The validity of the common shares offered hereby and other matters relating to Marshall Islands and United States law will be passed upon for us by Seward & Kissel LLP, One Battery Park Plaza, New York, New York 10004. The underwriters have been represented in connection with this offering by Fried, Frank, Harris, Shriver & Jacobson LLP, New York, New York.

EXPERTS

The financial statements and management’s assessment of the effectiveness of internal control over financial reporting (which is included in Management’s Report on Internal Control over Financial Reporting) incorporated in this Prospectus by reference to the Annual Report on Form 20-F for the year ended December 31, 2016 have been so incorporated in reliance on the report of PricewaterhouseCoopers Audit, an independent registered public accounting firm, given on the authority of said firm as experts in auditing and accounting.

The audited historical financial statements of Navig8 Product Tankers Inc included in Exhibit 99.3 of our Current Report on Form 6-K dated May 23, 2017 have been so incorporated in reliance on the report of PricewaterhouseCoopers AS, independent accountants, given on the authority of said firm as experts in auditing and accounting. PricewaterhouseCoopers AS is a member of Den norske Revisorforening.

The international oil tanker shipping industry information, also incorporated in this prospectus supplement by reference to the Company’s Annual Report on Form 20-F for the year ended December 31, 2016, attributed to Drewry Shipping Consultants Ltd., or Drewry, has been reviewed by Drewry, which has confirmed to us that such sections accurately describe the international tanker market, subject to the availability and reliability of the data supporting the statistical information presented in this prospectus supplement.

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WHERE YOU CAN FIND ADDITIONAL INFORMATION

As required by the Securities Act of 1933, we filed a registration statement on Form F-3 (Registration No. 333-210284) relating to the securities offered by this prospectus supplement with the Commission. This prospectus supplement and the accompanying base prospectus are parts of that registration statement, which includes additional information.

Government Filings

We file annual and special reports with the Commission. You may read and copy any document that we file and obtain copies at prescribed rates from the Commission’s Public Reference Room at 100 F Street, N.E., Washington, D.C. 20549. You may obtain information on the operation of the Public Reference Room by calling 1 (800) SEC-0330. The Commission maintains a website (http://www.sec.gov) that contains reports, proxy and information statements and other information regarding issuers that file electronically with the Commission. Our filings are also available on our website at http://www.scorpiotankers.com. The information on our website, however, is not, and should not be deemed to be, a part of this prospectus supplement or the accompanying base prospectus.

Information Incorporated By Reference

The Commission allows us to “incorporate by reference” information that we file with it. This means that we can disclose important information to you by referring you to those filed documents. The information incorporated by reference is considered to be a part of this prospectus supplement, and information that we file later with the Commission prior to the termination of this offering will also be considered to be part of this prospectus supplement and will automatically update and supersede previously filed information, including information contained in this document.

We hereby incorporate by reference the documents listed below and certain future filings made with the Commission under Section 13(a), 13(c) or 15(d) of the Exchange Act:

We are also incorporating by reference all subsequent annual reports on Form 20-F that we file with the Commission and certain current reports on Form 6-K that we furnish to the Commission after the date of this prospectus supplement (if they state that they are incorporated by reference into this prospectus supplement) until we file a post-effective amendment indicating that the offering of the securities made by this prospectus supplement has been terminated. In all cases, you should rely on the later information over different information included in this prospectus supplement or the accompanying base prospectus.

We have authorized only the information contained or incorporated by reference in this prospectus supplement and the accompanying base prospectus, and any free writing prospectus prepared by or on behalf of

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us or to which we have referred you. We have not, and the underwriters have not, authorized any other person to provide you with different information. We and the underwriters take no responsibility for, and can provide no assurance as to the reliability of, any information that others may give you. We are not, and the underwriters are not, making an offer to sell these securities in any jurisdiction where the offer or sale is not permitted. You should assume that the information appearing in this prospectus supplement as well as the information we previously filed with the Commission and incorporated by reference, is accurate as of the dates of those documents only. Our business, financial condition and results of operations and prospects may have changed since those dates.

You may request a free copy of the above mentioned filing or any subsequent filing we incorporated by reference into this prospectus supplement by writing or telephoning us at the following addresses:

INFORMATION PROVIDED BY THE COMPANY

We will furnish holders of our common shares with annual reports containing audited financial statements and a report by our independent registered public accounting firm. The audited financial statements will be prepared in accordance with IFRS. As a “foreign private issuer,” we are exempt from the rules under the Exchange Act prescribing the furnishing and content of proxy statements to shareholders. While we furnish proxy statements to shareholders in accordance with the rules of the NYSE, those proxy statements do not conform to Schedule 14A of the proxy rules promulgated under the Exchange Act. In addition, as a “foreign private issuer,” our officers and directors are exempt from the rules under the Exchange Act relating to short swing profit reporting and liability.

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Prospectus

SCORPIO TANKERS INC.

Common Shares, Preferred Shares, Debt Securities, Warrants, Purchase Contracts, Rights and Units

Through this prospectus, we or any selling shareholder may periodically offer common shares, preferred shares, debt securities, warrants, purchase contracts, rights, and units. We may also offer securities of the types listed above that are convertible or exchangeable into one or more of the securities listed above.

This prospectus describes some of the general terms that may apply to these securities. The prices and other terms of the securities that we or any selling shareholder will offer will be determined at the time of their offering and will be set forth in an amendment to the registration statement of which this prospectus forms a part, or in a supplement to this prospectus, or may be set forth in one or more documents incorporated by reference in this prospectus.

The securities issued under this prospectus may be offered directly or through one or more underwriters, agents or dealers, or through other means. The names of any underwriters, agents or dealers will be included in a supplement to this prospectus.

Our common shares are listed on the New York Stock Exchange, or NYSE, under the symbol “STNG,” our 7.50% Unsecured Senior Notes due 2017 are listed on the NYSE under the symbol “SBNB” and our 6.75% Unsecured Senior Notes due 2020 are listed on the NYSE under the symbol “SBNA.”

Investing in our securities involves a high degree of risk. Before you make an investment in our securities, you should carefully consider the section entitled “Cautionary Statement Regarding Forward-Looking Statements” and the section entitled “Risk Factors” of this prospectus, and other risk factors contained in the applicable prospectus supplement and in the documents incorporated by reference herein and therein.

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

The date of this prospectus is March 18, 2016.

TABLE OF CONTENTS

You should rely only on the information contained or incorporated by reference in this prospectus and in any prospectus supplement. We have not authorized any other person to provide you with different information. If anyone provides you with different or inconsistent information, you should not rely on it. We will not make an offer to sell these securities in any jurisdiction where the offer or sale is not permitted. You should assume that the information appearing in this prospectus and the applicable supplement to this prospectus is accurate as of the date on its respective cover, and that any information incorporated by reference is accurate only as of the date of the document incorporated by reference, unless we indicate otherwise. Our business, financial condition, results of operations and prospects may have changed since those dates.

ABOUT THIS PROSPECTUS

This prospectus is part of a registration statement that we filed with the U.S. Securities and Exchange Commission, or the Commission, using a shelf registration process. Under the shelf registration process, we or any selling shareholder may sell, from time to time, our common shares, preferred shares, debt securities, warrants, purchase contracts, rights, and units described in this prospectus, in one or more offerings. No limit exists on the aggregate amount of the securities we or any selling shareholder may sell pursuant to the registration statement of which this prospectus forms a part. This prospectus provides you with a general description of the securities we or any selling shareholder may offer. Each time we or a selling shareholder offer securities, we will provide you with a prospectus supplement that will describe, among other things, the specific amounts, prices and terms of the offered securities. We may file a prospectus supplement in the future that may also add, update or change the information contained in this prospectus. You should read carefully this prospectus, any prospectus supplement, and the additional information described below under the heading “Where You Can Find Additional Information.”

This prospectus and any prospectus supplement are part of a registration statement that we filed with the Commission and do not contain all the information in the registration statement. Forms of the indentures and other documents establishing the terms of the offered securities are filed as exhibits to the registration statement. Statements in this prospectus or any prospectus supplement about these documents are summaries and each statement is qualified in all respects by reference to the document to which it refers. You should refer to the actual documents for a more complete description of the relevant matters. For further information about us or the securities offered hereby, you should refer to the registration statement, which you can obtain from the Commission as described below under the section entitled “Where You Can Find Additional Information.”

Unless the context otherwise requires, when used in this prospectus, the terms “Scorpio Tankers,” the “Company,” “we,” “our” and “us” refer to Scorpio Tankers Inc. and its subsidiaries. “Scorpio Tankers Inc.” refers only to Scorpio Tankers Inc. and not its subsidiaries.

Unless otherwise indicated, all references to “dollars” and “$” in this prospectus are to, and amounts are presented in, United States dollars. We prepare our financial statements, including all of the financial statements included or incorporated by reference in this prospectus, in U.S. dollars and in accordance with International Financial Reporting Standards as issued by the International Accounting Standards Board. We have a fiscal year end of December 31.

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RISK FACTORS

An investment in our securities involves a high degree of risk. Before making an investment in our securities, you should carefully consider all of the information included or incorporated by reference into this prospectus and in any prospectus supplement, including the risks described under the heading “Risk Factors” in our Annual Report on Form 20-F filed with the Commission on March 18, 2016, as updated by annual and other reports and documents we file with the Commission after the date of this prospectus and that are incorporated by reference herein. Please see the section of this prospectus entitled “Where You Can Find Additional Information.”

The occurrence of one or more of those risk factors could adversely impact our business, financial condition or results of operations. When we offer and sell any securities pursuant to a prospectus supplement, we may include additional risk factors relevant to such securities in the prospectus supplement.

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CAUTIONARY STATEMENT REGARDING FORWARD LOOKING STATEMENTS

The Private Securities Litigation Reform Act of 1995 provides safe harbor protections for forward-looking statements in order to encourage companies to provide prospective information about their business. Forward-looking statements include statements concerning plans, objectives, goals, strategies, future events or performance, and underlying assumptions and other statements, which are other than statements of historical facts.

This prospectus includes assumptions, expectations, projections, intentions and beliefs about future events. These statements are intended as “forward-looking statements.” We desire to take advantage of the safe harbor provisions of the Private Securities Litigation Reform Act of 1995 and are including this cautionary statement in connection therewith. This prospectus and any other written or oral statements made by us or on our behalf may include forward-looking statements, which reflect our current views with respect to future events and financial performance, and are not intended to give any assurance as to future results or events. We caution that assumptions, expectations, projections, intentions and beliefs about future events may and often do vary from actual results and the differences can be material. When used in this prospectus, the words “believe,” “expect,” “anticipate,” “estimate,” “intend,” “plan,” “target,” “project,” “likely,” “may,” “will,” “would,” “could” and similar expressions, terms, or phrases may identify forward-looking statements.

The forward-looking statements in this prospectus are based upon various assumptions, many of which are based, in turn, upon further assumptions, including without limitation, management’s examination of historical operating trends, data contained in our records and other data available from third parties. Although we believe that these assumptions were reasonable when made, because these assumptions are inherently subject to significant uncertainties and contingencies which are difficult or impossible to predict and are beyond our control, we cannot assure you that we will achieve or accomplish these expectations, beliefs or projections.

In addition to important factors and matters discussed elsewhere in this prospectus and in the documents incorporated by reference herein, important factors that, in our view, could cause our actual results to differ materially from those discussed in the forward-looking statements include:

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These factors and the other risk factors described in this prospectus are not necessarily all of the important factors that could cause actual results or developments to differ materially from those expressed in any of our forward-looking statements. Other unknown or unpredictable factors also could harm our results. Consequently, there can be no assurance that actual results or developments anticipated by us will be realized or, even if substantially realized, that they will have the expected consequences to, or effects on, us. These forward-looking statements are not guarantees of our future performance, and actual results and future developments may vary materially from those projected in the forward-looking statements. Given these uncertainties, prospective investors are cautioned not to place undue reliance on such forward-looking statements, which speak only as of their dates. We undertake no obligation, and specifically decline any obligation, except as required by law, to publicly update or revise any forward-looking statements, whether as a result of new information, future events or otherwise. For a discussion of these risks and uncertainties, please see the section of this prospectus entitled “Risk Factors.”

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RATIO OF EARNINGS TO FIXED CHARGES

The following table sets forth our unaudited ratio of earnings to fixed charges for the periods presented.