SEC Form F-3 filed by Radiopharm Theranostics Limited

As filed with the Securities and Exchange Commission on December 17, 2025

Registration No. 333-          

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM F-3

REGISTRATION STATEMENT

UNDER THE SECURITIES ACT OF 1933

Radiopharm Theranostics Limited

(Exact name of registrant as specified in its charter)

Not Applicable

(Translation of registrant’s name into English)

Level 3, 62 Lygon Street

Carlton, VIC 3053
Australia

(Address and telephone number of registrant’s principal executive offices)

Vcorp Services, LLC

25 Robert Pitt Drive, Suite 204

Monsey, New York 10952

Tel: (888) 528-2677

(Name, address and telephone number of agent for service)

Copies to:

Andrew Reilly

Rimôn Law

Level 2, 50 Bridge Street
Sydney, NSW 2000, Australia

Tel: +61 2 9055 6965

andrew.reilly@rimonlaw.com

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, 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. ☐

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.C. 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.C. 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 an emerging growth company as defined in Rule 405 of the Securities Act of 1933.

Emerging growth company ☒

If an emerging growth company that prepares its financial statements in accordance with U.S. GAAP, 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. ☐

The registrant hereby amends this registration statement on such date or dates as may be necessary to delay its effective date until the registrant shall file a further amendment which specifically states that this registration statement shall thereafter become effective in accordance with Section 8 (a) of the Securities Act of 1933, as amended, or until the registration statement shall become effective on such date as the Securities and Exchange Commission, acting pursuant to said Section 8(a), may determine.

The information in this prospectus is not complete and may be changed. We cannot sell these securities until the registration statement that we have filed with the Securities and Exchange Commission is effective. This prospectus is not an offer to sell these securities and it is not soliciting an offer to buy these securities in any state where their offer or sale is not permitted.

Subject to Completion, dated December 17, 2025

Preliminary Prospectus

Radiopharm Theranostics Limited

140,999,999 Ordinary Shares represented by
470,000 American Depositary Shares

140,999,999 Ordinary Shares underlying Options

In October 2025, Radiopharm Theranostics Limited sold 1,166,666,667 ordinary shares to institutional and professional investors, including the persons identified in this prospectus (the “Selling Shareholders”), in exchange for proceeds of approximately A$35 million (“Private Placement”). Participants in the Private Placement received 1 option (“Option”) for every share subscribed for under the Private Placement, with an exercise price of A$0.039 per Option and expiration of October 31, 2027.

This prospectus is part of a registration statement on Form F-3 that Radiopharm has filed with the Securities and Exchange Commission. Upon effectiveness of the registration statement, the Selling Shareholders will be able to deposit their ordinary shares in Radiopharm’s American Depositary Receipt program and receive American Depositary Shares, or ADSs. Each ADS represents 300 ordinary shares.

The registration statement (including this prospectus) relates to the registration under the Securities Act of 1933 of 140,999,999 ordinary shares that the Selling Shareholders purchased in the Private Placement, with such ordinary shares represented by 470,000 ADSs that will have the same rights as existing ADSs and which may be offered from time to time for sale in the United States as well as up to 140,999,999 ordinary shares underlying Options.

The ADSs are listed on the Nasdaq Capital Market under the symbol “RADX”. Our ordinary shares are listed on the Australian Securities Exchange under the symbol “RAD”.

The Selling Shareholders will receive all the proceeds from any sales of ADSs offered pursuant to this prospectus. We will not receive any of these proceeds but we will pay the expenses associated with registering the sales of ADSs by the Selling Shareholders. We will receive the proceeds from the exercise of the Options.

The Selling Shareholders may offer and sell the ADSs at various times and in various types of transactions, including sales in the open market, sales in negotiated transactions and sales by a combination of these methods. ADSs may be offered and sold at the market price at the time of a sale, at prices relating to the market price over a period of time or at prices negotiated with the buyers of ADSs. See “Plan of Distribution” for more information.

Investing in our ADSs involves a high degree of risk. You should review carefully the risks referenced under the heading “Risk Factors” beginning on page 4 of this prospectus and under similar headings in any amendment or supplement to this prospectus or as updated by any subsequent filing with the Securities and Exchange Commission that is incorporated by reference herein.

Neither the Securities and Exchange Commission nor any U.S. state or other securities commission has approved or disapproved of these securities or passed upon the adequacy or accuracy of this prospectus. Any representation to the contrary is a criminal offense.

The date of this prospectus is        , 2025

TABLE OF CONTENTS

You should rely only on the information provided by this prospectus, any prospectus supplement and any information incorporated by reference. We have not authorized anyone else to provide you with different or additional information or to make any representations other than those contained in or incorporated by reference to this prospectus or any accompanying prospectus supplement.

We have not taken any action to permit a public offering of the ADSs outside the United States or to permit the possession or distribution of this prospectus outside the United States. Persons outside the United States who come into possession of this prospectus must observe any restrictions relating to the offering of the ADSs and the distribution of this prospectus outside of the United States. This prospectus is not an offer to sell, or solicitation of an offer to buy, any securities in any circumstances under which the offer of solicitation is unlawful.

ABOUT THIS PROSPECTUS

This prospectus is part of a Registration Statement that we have filed with the SEC on Form F-3. This prospectus relates to the offer and sale from time to time by the Selling Shareholders identified in this prospectus of up to 940,000 ADSs (representing 281,999,998 ordinary shares) of Radiopharm Theranostics Limited.

This prospectus only provides you with a general description of the securities being offered. Each time a Selling Shareholder sells any of the offered ADSs, such Selling Shareholder will provide this prospectus and a prospectus supplement, if applicable, that will contain specific information about the terms of the offering.

The prospectus supplement may also add, update or change information contained in this prospectus, and may also contain information about any material federal income tax considerations relating to the ADSs. You should read both this prospectus and any prospectus supplement, together with additional information described below under the heading “Where You Can Find More Information,” and “Information Incorporated by Reference” before deciding whether to invest in any of the ADSs being offered by the Selling Shareholders. This prospectus does not contain all of the information included in the registration statement. For a more complete understanding of the offering of the ADSs, you should refer to the registration statement, including the exhibits. You may access the registration statement, exhibits and other reports we file with the SEC on the SEC’s website. More information regarding how you can access such documents is included under the heading “Where You Can Find More Information” below.

The information in this prospectus is accurate as of the date on the front cover of this prospectus, and the information in any free writing prospectus that we may provide you in connection with this offering is accurate only as of the date of that free writing prospectus. Neither the delivery of this prospectus nor the sale of any securities means that information contained in this prospectus is correct after the date of this prospectus or as of any other date. To the extent there is any conflict between the information contained in this prospectus and the prospectus supplement, you should rely on the information in the prospectus supplement, provided that if any statement in one of these documents is inconsistent with a statement in another document having a later date, the statement in the document having the later date modifies or supersedes the earlier statement. Any information incorporated by reference is only accurate as of the date of the document incorporated by reference.

Unless otherwise indicated or the context implies otherwise:

All references to “$”, “US$” and “U.S. dollar” in this prospectus refer to United States dollars. Except as otherwise stated, all monetary amounts in this prospectus are presented in United States dollars. Unless otherwise indicated, the consolidated financial statements and related notes included, or incorporated by reference, in this prospectus have been prepared in accordance with Australian Accounting Standards and also comply with IFRS as issued by the International Accounting Standards Board, which differs in certain significant respects from Generally Accepted Accounting Principles in the United States. Our fiscal year ends on June 30 of each year. References to “fiscal 2025” means the 12-month period ended June 30, 2025, and other fiscal years are referred to in a corresponding manner.

We own or have rights to trademarks and trade names that we use in connection with the operation of our business, including our corporate name, logos, product names and website names. Other trademarks and trade names appearing in this prospectus and the documents incorporated by reference are the property of their respective owners. Solely for your convenience, some of the trademarks and trade names referred to in this prospectus and the documents incorporated by reference are listed without the ® and TM symbols, but we will assert, to the fullest extent under applicable law, our rights to our trademarks and trade names.

CAUTIONARY NOTE REGARDING FORWARD-LOOKING STATEMENTS

Certain statements in this prospectus, any prospectus supplement, any free writing prospectus and in the documents incorporated by reference may constitute forward-looking statements within the meaning of Section 27A of the Securities Act of 1933, as amended, or the Securities Act, and Section 21E of the Securities Exchange Act of 1934, as amended, or the Exchange Act. We intend such forward-looking statements to be covered by the safe harbor provisions for forward-looking statements contained in the Private Securities Litigation Reform Act of 1995. The forward-looking statements relate to future events or our future financial performance and involve known and unknown risks, uncertainties and other factors that may cause our actual results, levels of activity, performance or achievements to differ materially from any future results, levels of activity, performance or achievements expressed or implied by these forward-looking statements.

Words such as, but not limited to, “believe,” “expect,” “anticipate,” “estimate,” “intend,” “plan,” “targets,” “likely,” “will,” “would,” “could,” and similar expressions or phrases identify forward-looking statements. We have based these forward-looking statements largely on our current expectations and future events and financial trends that we believe may affect our financial condition, results of operation, business strategy and financial needs. Forward-looking statements include, but are not limited to, statements about:

You should read thoroughly this prospectus, any prospectus supplement, any free writing prospectus and in the documents incorporated by reference with the understanding that our actual future results may be materially different from and/or worse than what we expect. We qualify all of our forward-looking statements by these cautionary statements. Other sections of this prospectus and in the documents incorporated by reference include additional factors which could adversely impact our business and financial performance. Moreover, we operate in an evolving environment. New risk factors emerge from time to time and it is not possible for our management to predict all risk factors, nor can we assess the impact of all factors on our business or the extent to which any factor, or combination of factors, may cause actual results to differ materially from those contained in any forward-looking statements.

This prospectus and documents incorporated by reference may contain third-party data relating to the biopharmaceutical market that includes projections based on a number of assumptions. The biopharmaceutical market may not grow at the rates projected by market data, or at all. The failure of this market to grow at the projected rates may have a material adverse effect on our business and the market price of our ADSs. Furthermore, if any one or more of the assumptions underlying the market data turns out to be incorrect, actual results may differ from the projections based on these assumptions. You should not place undue reliance on these forward-looking statements.

You should not rely upon forward-looking statements as predictions of future events. The forward-looking statements made in this prospectus relate only to events or information as of the date on which the statements are made in this prospectus (or, in the case of a document incorporated by reference, the date on which the statements are made in such document). We undertake no obligation to update or revise any forward-looking statements, whether as a result of new information, future events or otherwise.

IMPLICATIONS OF BEING AN EMERGING GROWTH COMPANY

As a company with less than US$1.235 billion in revenue during our last fiscal year, we qualify as an “emerging growth company” as defined in the Jumpstart Our Business Startups Act of 2012 (the “JOBS Act”). An emerging growth company may take advantage of reduced reporting requirements that are otherwise applicable to public companies. These advantages include not being required to comply with the auditor attestation requirements of Section 404 of the Sarbanes-Oxley Act of 2002.

We may take advantage of these provisions until the last day of our fiscal year following the fifth anniversary of our initial public offering. However, if certain events occur prior to the end of such five-year period, our annual gross revenues exceed US$1.235 billion or we issue more than US$1.0 billion of non-convertible debt in any three-year period, then we will cease to be an emerging growth company prior to the end of such five-year period.

We may elect to take advantage of reduced reporting requirements in future filings. As a result, the information in this prospectus and that we provide to our shareholders in the future may be different than what you might receive from other public reporting companies in which you hold equity interests.

IMPLICATIONS OF BEING A FOREIGN PRIVATE ISSUER

We are also considered a “foreign private issuer” under U.S. securities laws. In our capacity as a foreign private issuer, we are exempt from certain rules under the Exchange Act that impose certain disclosure obligations and procedural requirements for proxy solicitations under Section 14 of the Exchange Act. In addition, our senior management, the members of our board of directors and our principal shareholders are exempt from the reporting and “short-swing” profit recovery provisions of Section 16 of the Exchange Act and the rules under the Exchange Act with respect to their purchases and sales of our securities. Moreover, we are not required to file periodic reports and financial statements with the SEC as frequently or as promptly as U.S. companies whose securities are registered under the Exchange Act. In addition, we are not required to comply with Regulation FD, which restricts the selective disclosure of material information.

We may take advantage of these exemptions until such time as we are no longer a foreign private issuer. We will remain a foreign private issuer until such time that 50% or more of our outstanding voting securities are held by U.S. residents and any of the following three circumstances applies: (i) the majority of the members of board of directors or our senior management are U.S. citizens or residents; (ii) more than 50% of our assets are located in the United States; or (iii) our business is administered principally in the United States.

RISK FACTORS

Investing in the ADSs involves a high degree of risk. You should carefully consider the risks described under “Risk Factors” in our Annual Report on Form 20-F for fiscal year 2025, filed with the SEC, and all other information contained in or incorporated by reference in this prospectus and any prospectus supplement or related free writing prospectus before deciding whether to purchase any of our ADSs. If any of those risks actually occur, our business, financial condition and results of operations could be materially and adversely affected. In that event, the trading price of our ADSs could decline, and you may lose part or all of your investment.

Certain risks described under the “Risk Factors” section in our Annual Report on Form 20-F for fiscal year 2025, are summarized below:

Risks Related to Our Business

Risks Related to Intellectual Property

Risks Relating to Ownership of the ADS

The summary above is not exhaustive. For a more detailed discussion, see the “Risk Factors” section in our Annual Report on Form 20-F for fiscal year 2025. In addition, we may face additional risks that are presently unknown to us or that we believe to be immaterial as of the date of this prospectus. Known and unknown risks and uncertainties may significantly impact and impair our business operations.

USE OF PROCEEDS

We will not receive any proceeds from the resale of the ADSs by the Selling Shareholders. However, we will receive proceeds from any exercise of Options.

PRIVATE PLACEMENT

In October 2025, we sold 1,166,666,667 ordinary shares to institutional and professional investors in exchange for proceeds of approximately A$35 million (“Private Placement”). Participants in the Private Placement will receive 1 Option for every share subscribed for under the Private Placement, with an exercise price of A$0.039 per option and expiration of October 31, 2027.

This prospectus relates to the offer and sale by the Selling Shareholders of 140,999,999 ordinary shares that the Selling Shareholders purchased in the Private Placement, with such ordinary shares represented by 470,000 ADSs that will have the same rights as existing ADSs and which may be offered from time to time for sale in the United States as well as up to 140,999,999 ordinary shares underlying Options.

CAPITALIZATION

The following table sets forth our cash and cash equivalents and capitalization as of June 30, 2025:

Investors should read this table in conjunction with our consolidated financial statements and related notes incorporated by reference in this prospectus.

PRINCIPAL TRADING MARKETS

Our ordinary shares have traded on the Australian Securities Exchange, or ASX, since November 2021 and trade under the symbol “RAD”. Our ADSs have traded on the Nasdaq Capital Market since November 2024 and trade under the symbol “RADX”. Each ADS represents 300 ordinary shares.

Historical information on the trading prices for our ordinary shares can be found on the website of the ASX (www.asx.com.au) and for our ADSs on the website of Nasdaq (www.nasdaq.com).

SELLING SHAREHOLDERS

We are registering ordinary shares as represented by ADSs to permit the Selling Shareholders to offer such shares for resale from time to time.

The table below lists the Selling Shareholders and other information regarding the beneficial ownership of our ordinary shares (including ordinary shares represented by ADSs) by each of the Selling Shareholders as of December 10, 2025.

DESCRIPTION OF SHARE CAPITAL

General

Our constituent document is a Constitution. The Constitution is subject to the terms of the Listing Rules of ASX Limited and the Corporations Act 2001. The Constitution may be amended or repealed and replaced by special resolution of shareholders, which is a resolution of which notice has been given and that has been passed by at least 75% of the votes cast by shareholders entitled to vote on the resolution.

Purposes and Objects

As a public company we have all the rights, powers and privileges of a natural person. Our Constitution does not provide for or prescribe any specific objects or purposes.

The Powers of the Directors

Under the provision of our Constitution our directors may exercise all the powers of our company except any powers that the Corporations Act or the constitution attributes to the Company.

Interested Directors

According to our constitution, if a Director discloses his or her interests in a matter that is being considered by the Board, in accordance with the Corporations Act, the director may (i) contract or make an arrangement with the Company, or a related body corporate of the Company or a body corporate in which the Company is interested, in any matter in any capacity, (ii) be counted in a quorum for a meeting of Directors considering the contract or arrangement provided that such Director is entitled to vote on at least one of the resolutions proposed at the same meeting, (iii) vote on whether the Company enters into the contract or arrangement, and on any matter that relates to the contract or arrangement, (iv) or witness the affixing of the common seal of the Company to, any document in respect of the contract or arrangement, (v) retain the benefits under the contract or arrangement. A director who has a material personal interest in a matter that is being considered by the directors must not be present at a meeting while the matter is being considered nor vote on the matter, except where permitted by the Corporations Act.

Unless a relevant exception applies, the Corporations Act requires our directors to provide disclosure of certain interests or conflicts of interests and prohibits directors from voting on matters in which they have a material personal interest and from being present at the meeting while the matter is being considered. In addition, the Corporations Act and the ASX Listing Rules require shareholder approval of any provision of related party benefits to our directors.

Directors’ compensation

Our directors are paid remuneration for their services as directors. The total amount of remuneration given to all directors for their services as directors must not exceed in aggregate in any financial year the amount fixed by the company in general meeting. The aggregate, fixed sum for directors’ remuneration is to be divided among the directors in such proportion as the directors themselves agree and in accordance with our Constitution.

Remuneration payable to the director may be given in the manner as the directors decide, including by way of non-cash benefit, such as a contribution to a superannuation fund. Remuneration paid to our executive directors must also not include a commission or percentage of operating revenue.

Pursuant to our Constitution, any director who devotes special attention to the business of the company, or who performs services that in the opinion of our board of directors, are outside the scope of the ordinary duties of a director, or who at the request of the directors engages in any journey on the business of the company, may be paid extra remuneration, which is determined by our board of directors.

In addition to other remuneration provided in our Constitution, all of our directors are entitled to be paid by us all travelling and other expenses incurred by the directors in attending to the company’s affairs, including attending and returning from general meetings of the company, meetings of the directors or committee meetings of the directors.

In addition, in accordance with our Constitution, a director may be paid a retirement benefit as determined by our board of directors subject to the limits set out in the Corporations Act and the ASX Listing Rules which broadly restrict our ability to pay our officers a termination benefit in the event of a change of control of the Company or our subsidiaries as well as impose requirements for shareholder approval to be obtained to pay certain retirement benefits to our officers.

Borrowing powers exercisable by Directors

Pursuant to our Constitution, the management and control of our business affairs are vested in our board of directors. Thus, our board of directors has the power to raise or borrow money, and charge any of our property or business or any uncalled capital, and may issue debentures or give any other security for any of our debts, liabilities or obligations or of any other person, in each case, in the manner and on terms it deems fit.

Retirement of Directors

Pursuant to our Constitution and the ASX Listing Rules, each director, other than the managing director, must not hold office for more than three years or beyond the third annual general meeting following his or her appointment (whichever is longer). Further, at least one director is required to retire by rotation at each annual general meeting (such director being the director who has been longest in office since their last election). Directors who retire by rotation are eligible for a re-election to the board of directors unless disqualified from acting as a director under the Corporations Act or our Constitution.

Rights Attached to Our Ordinary Shares

The concept of authorized share capital no longer exists in Australia and as a result, our authorized share capital is unlimited. All our outstanding ordinary shares are validly issued, fully paid and non-assessable. The rights attached to our ordinary shares are as follows:

Dividend Rights.

The directors may declare that a dividend be paid to the members according to the shareholders’ pro rata shareholdings and the directors may fix the amount, the time for payment and the method of payment. No dividend is payable except in accordance with the Corporations Act as amended from time to time and no dividend carries interest as against the Company.

Voting Rights.

Subject to the Constitution, at a general meeting, each shareholder has one vote on a show of hands and in the circumstance where the voting is carried out on a poll, each shareholder present has one vote for each fully paid ordinary share and a fraction of a vote equivalent to the proportion which the amount is paid up for any shares that is not fully paid Such voting rights may be affected by the grant of any special voting rights to the holders of a class of shares with preferential rights that may be authorized in the future.

The quorum required for a general meeting of shareholders consists of at least any two shareholders present in person and entitled to vote on a resolution at the meeting. According to our Constitution, a resolution put to the vote of a general meeting must be decided on a show of hands unless a poll is demanded under which every ordinary shareholder present in person or by proxy has one vote for every ordinary share held. Under our Constitution, a poll may be demanded by the chairman, at least five members entitled to vote on the resolution; or by members with at least 5% of the votes that may be cast on the resolution on a poll.

A meeting adjourned for lack of a quorum generally is adjourned to the same day in the following week at the same time and place unless otherwise decided by the directors present at the meeting. At the reconvened meeting, the required quorum consists of any two members present in person. The meeting is dissolved if a quorum is not present within 30 minutes from the time appointed for the meeting.

An ordinary resolution of shareholders requires approval by a majority of votes cast by shareholders present at the meeting in person, by proxy, attorney or representative. Under our Constitution, the Corporations Act and the ASX Listing Rules, certain matters must be passed by way of a special resolution. A special resolution must be passed by at least 75% of the votes cast by shareholders entitled to vote on the resolution and present at the meeting in person, by proxy, attorney or representative. Matters which are not required to be passed by special resolution are required to be passed by ordinary resolution.

Rights in Our Profits.

Subject to the share classes and the rights attached to each class of shares, our shareholders have the right to share in our profits distributed as a dividend and any other permitted distribution.

Rights in the Event of Liquidation.

Subject to the Constitution and the terms of issue of any shares or classes of shares, in the event the company is wound up, after satisfaction of debts and liabilities to creditors and any costs, charges or expenses incurred for the winding up, our assets will be divided and distributed among the shareholders to the number of shares held by them, irrespective of the amounts paid or credited as paid on the shares. The distribution to any shareholder of any partly paid share must be reduced by the unpaid amount as at the date of distribution. This right may be affected by the grant of preferential dividend or distribution rights to the shareholders of preference shares, such as the right in winding up to payment in cash of the amount then paid up on the share, and any arrears of dividend in respect of that share, in priority to any other class of shares.

Directors may make calls

Our Constitution provides that subject to the terms on which the shares have been issued directors may make calls on a shareholder for amounts unpaid on shares held by that shareholder, other than monies payable at fixed times under the conditions of allotment, require a call to be paid by instalments and revoke or postpone a call. The company must give notice of a call at least 30 business days (or any longer period required by the Listing Rules) before the amount called is due, specifying the time and place of payment.

Changing Rights Attached to Shares

According to our Constitution, the rights attached to any class of shares, unless otherwise provided by the terms of the class, may be varied with either the written consent of the holders of not less than 75% of the issued shares of that class or the sanction of a special resolution passed at a separate general meeting of the shares of that class.

Annual and Extraordinary Meetings

Our directors must convene an annual meeting of shareholders at least once every calendar year. Notice of at least 28 days prior to the date of the meeting is required. A general meeting may be convened by a directors’ resolution or as otherwise provided in the Corporations Act.

Limitations on the Rights to Own Securities in Our Company

Subject to certain limitations on the percentage of shares a person may hold in our company, neither our Constitution nor the laws of the Commonwealth of Australia restrict in any way the ownership or voting of shares in our company.

Changes in Our Capital

Pursuant to the Listing Rules, our directors may in their discretion issue securities to persons who are not related parties of our company, without the approval of shareholders, if such issue, when aggregated with securities issued by our company during the previous 12-month period would be an amount that would not exceed 15% of our issued capital at the commencement of the 12-month period. Other allotments of securities require approval by an ordinary resolution of shareholders.

Exchange Controls

Australia has largely abolished exchange controls on investment transactions. The Australian dollar is freely convertible into U.S. dollars. In addition, there are currently no specific rules or limitations regarding the export from Australia of profits, dividends, capital or similar funds belonging to foreign investors, except that certain payments to non-residents must be reported to the Australian Transaction Reports and Analysis Centre (“AUSTRAC”), which monitors such transactions.

Amounts may also be required to be withheld from payments made to non-resident shareholders under the Australian taxation legislation (and remitted to the Australian Taxation Office (“ATO”)), unless a relevant exemption applies.

The Foreign Acquisitions and Takeovers Act 1975

Under Australian law, in certain circumstances foreign persons are prohibited from acquiring more than a limited percentage of the shares in an Australian company without approval from the Australian Treasurer. These limitations are set forth in the Australian Foreign Acquisitions and Takeovers Act 1975 (Cth) (“FATA”), associated legislation and regulations. These limitations are in addition to the more general overarching Takeovers Prohibition of an acquisition of more than a 20% interest in a public company (in the absence of an applicable exception) under the takeover provisions of Australia’s Corporations Act by any person whether foreign or otherwise.

If an investment is subject to foreign investment approval, it may have compulsory prior notification requirements, being a “notifiable action” or “notifiable national security action” or voluntary prior notification requirements being a “significant action” or “reviewable national security action”. If an investment falls in this voluntary application category, the seeking of approval will extinguish certain future rights the Australian Treasurer has to review and approve the investment. Not applying for approval where the voluntary notification provisions apply will not be a breach of the FATA.

The Australian foreign investment regime applies differently to ‘foreign government investors’ and private foreign persons. Broadly, entities are considered as foreign persons if (i) a foreign holder (together with its associates) holds a direct or indirect interest of 20% or more in the entity or (ii) multiple foreign holders hold an aggregate interest (direct or indirect) of at least 40%. An entity will be a ‘foreign government investor’ if (i) a foreign government or foreign government owned entity, or a number of foreign government owned entities from the same country own a direct or indirect interest of 20% or (ii) or multiple foreign governments or foreign government owned entities from any country own a direct or indirect interest of 40%.

Under the FATA, foreign persons are required to notify and obtain prior approval from the Foreign Investment Review Board for a range of acquisitions of an interest in an Australian entity on a mandatory basis, including:

Each foreign person seeking to acquire holdings in excess of the above caps (including their associates) would need to complete an application form setting out the proposal and relevant particulars of the acquisition/shareholding and pay the relevant application fees. The Australian Treasurer then has 30 days to consider the application and make a decision and a further 10 days to notify the applicant. However, the Australian Treasurer has broad powers to extend this time period, including extending the period by up to a further 90 days by publishing an interim order. Most commonly, the Australian Treasurer will request an applicant agree to an extension to avoid needing to publish the interim order, such agreement is usually in the best interest of the applicant as interim orders are made public and by agreeing to an extension the application process is kept confidential. Otherwise applications are strictly confidential and not released to the public.

The Australian Foreign Investment Review Board, an Australian advisory board to the Australian Treasurer has provided a guideline titled Australia’s Foreign Investment Policy, which provides an outline of the policy. As for the risk associated with seeking approval, the policy provides, among other things, that the Treasurer will reject an application if it is contrary to the national interest.

If an application is made to the Australian Treasurer (whether voluntary or compulsory), the Australian Treasurer may either issue a non-objection notice, a non-objection notice with conditions or a rejection notice.

If the necessary approvals are not obtained, the Treasurer has a range of enforcement powers, including the power to make an order requiring the acquirer to dispose of the shares it has acquired within a specified period of time. Once a foreign person (together with any associate) holds a direct interest or a substantial interest in an entity, any further acquisition of interests, including in the course of trading in the secondary market, would require a new FIRB approval unless an exemption applies.

Once granted, a FIRB approval is valid for a 12-month period, meaning the proposed acquisition which was the subject of an application can occur any time during that 12-month period.

DESCRIPTION OF AMERICAN DEPOSITARY SHARES

Deutsche Bank Trust Company Americas, as depositary, will register and deliver the ADSs. Each ADS will represent ownership of 300 ordinary shares, deposited with National Nominees Limited, as custodian for the depositary. Each ADS will also represent ownership of any other securities, cash or other property which may be held by the depositary. The depositary’s corporate trust office at which the ADSs will be administered is located at 1 Columbus Circle, New York, NY 10019, USA

The Direct Registration System, or DRS, is a system administered by The Depository Trust Company, or DTC, pursuant to which the depositary may register the ownership of uncertificated ADSs, which ownership shall be evidenced by periodic statements issued by the depositary to the ADS holders entitled thereto.

We will not treat ADS holders as our shareholders and accordingly, you, as an ADS holder, will not have shareholder rights. Australian law governs shareholder rights. The depositary will be the holder of the ordinary shares underlying your ADSs. As a holder of ADSs, you will have ADS holder rights. A deposit agreement among us, the depositary and you, as an ADS holder, and the beneficial owners of ADSs sets out ADS holder rights as well as the rights and obligations of the depositary. The laws of the State of New York govern the deposit agreement and the ADSs. See “— Jurisdiction and Arbitration.”

The following is a summary of the material provisions of the deposit agreement. For more complete information, you should read the entire deposit agreement and the form of American Depositary Receipt. For directions on how to obtain copies of those documents, see “Where You Can Find Additional Information.”

Holding the ADSs

How will you hold your ADSs?

You may hold ADSs either (i) directly (a) by having an American Depositary Receipt, or ADR, which is a certificate evidencing a specific number of ADSs, registered in your name, or (b) by holding ADSs in DRS, or (ii) indirectly through your broker or other financial institution. If you hold ADSs directly, you are an ADS holder. This description assumes you hold your ADSs directly. ADSs will be issued through DRS, unless you specifically request certificated ADRs. If you hold the ADSs indirectly, you must rely on the procedures of your broker or other financial institution to assert the rights of ADS holders described in this section. You should consult with your broker or financial institution to find out what those procedures are.

Dividends and Other Distributions

How will you receive dividends and other distributions on the shares?

The depositary has agreed to pay to you the cash dividends or other distributions it or the custodian receives on ordinary shares or other deposited securities, after deducting its fees and expenses. You will receive these distributions in proportion to the number of ordinary shares your ADSs represent as of the record date (which will be as close as practicable to the record date for our ordinary shares) set by the depositary with respect to the ADSs.

The depositary will allow rights that are not distributed or sold to lapse. In that case, you will receive no value for them.

If the depositary makes rights available to you, it will establish procedures to distribute such rights and enable you to exercise the rights upon your payment of applicable fees, charges and expenses incurred by the depositary and taxes and/or other governmental charges. The Depositary shall not be obliged to make available to you a method to exercise such rights to subscribe for ordinary shares (rather than ADSs).

U.S. securities laws may restrict transfers and cancellation of the ADSs represented by shares purchased upon exercise of rights. For example, you may not be able to trade these ADSs freely in the United States. In this case, the depositary may deliver restricted depositary shares that have the same terms as the ADSs described in this section except for changes needed to put the necessary restrictions in place.

There can be no assurance that you will be given the opportunity to exercise rights on the same terms and conditions as the holders of ordinary shares or be able to exercise such rights.

The depositary is not responsible if it decides that it is unlawful or impractical to make a distribution available to any ADS holders. We have no obligation to register ADSs, shares, rights or other securities under the Securities Act. We also have no obligation to take any other action to permit the distribution of ADSs, shares, rights or anything else to ADS holders. This means that you may not receive the distributions we make on our shares or any value for them if we and/or the depositary determines that it is illegal or not practicable for us or the depositary to make them available to you.

Deposit, Withdrawal and Cancellation

How are ADSs issued?

The depositary will deliver ADSs if you or your broker deposit ordinary shares or evidence of rights to receive ordinary shares with the custodian. Upon payment of its fees and expenses and of any taxes or charges, such as stamp taxes or stock transfer taxes or fees, the depositary will register the appropriate number of ADSs in the names you request and will deliver the ADSs to or upon the order of the person or persons entitled thereto.

No shares will be accepted for deposit prior to the date of effectiveness of this Registration Statement.

How do ADS holders cancel an American Depositary Share?

You may turn in your ADSs at the depositary’s corporate trust office or by providing appropriate instructions to your broker. Upon payment of its fees and expenses and of any taxes or charges, such as stamp taxes or stock transfer taxes or fees, the depositary will deliver the ordinary shares and any other deposited securities underlying the ADSs to you or a person you designate at the office of the custodian. Or, at your request, risk and expense, the depositary will deliver the deposited securities at its corporate trust office, to the extent permitted by law.

How do ADS holders interchange between Certificated ADSs and Uncertificated ADSs?

You may surrender your ADR to the depositary for the purpose of exchanging your ADR for uncertificated ADSs. The depositary will cancel that ADR and will send you a statement confirming that you are the owner of uncertificated ADSs. Alternatively, upon receipt by the depositary of a proper instruction from a holder of uncertificated ADSs requesting the exchange of uncertificated ADSs for certificated ADSs, the depositary will execute and deliver to you an ADR evidencing those ADSs.

Voting Rights

How do you vote?

You may instruct the depositary to vote the ordinary shares or other deposited securities underlying your ADSs at any meeting at which you are entitled to vote pursuant to any applicable law, the provisions of our constitution, and the provisions of or governing the deposited securities. Otherwise, you could exercise your right to vote directly if you withdraw the ordinary shares. However, you may not know about the meeting sufficiently enough in advance to withdraw the ordinary shares.

If we ask for your instructions and upon timely notice from us by regular, ordinary mail delivery, or by electronic transmission, as described in the deposit agreement, the depositary will notify you of the upcoming meeting at which you are entitled to vote pursuant to any applicable law, the provisions of our constitution, and the provisions of or governing the deposited securities, and arrange to deliver our voting materials to you. The materials will include or reproduce (a) such notice of meeting or solicitation of consents or proxies; (b) a statement that the ADS holders at the close of business on the ADS record date will be entitled, subject to any applicable law, the provisions of our constitution, and the provisions of or governing the deposited securities, to instruct the depositary as to the exercise of the voting rights, if any, pertaining to the ordinary shares or other deposited securities represented by such holder’s ADSs; and (c) a brief statement as to the manner in which such instructions may be given to the depositary. Voting instructions may be given only in respect of a number of ADSs representing an integral number of ordinary shares or other deposited securities. For instructions to be valid, the depositary must receive them in writing on or before the date specified. The depositary will try, as far as practical, subject to applicable law and the provisions of our constitution, to vote or to have its agents vote the ordinary shares or other deposited securities (in person or by proxy) as you instruct.

We cannot assure you that you will receive the voting materials in time to ensure that you can instruct the depositary to vote the ordinary shares underlying your ADSs. In addition, there can be no assurance that ADS holders and beneficial owners generally, or any holder or beneficial owner in particular, will be given the opportunity to vote or cause the custodian to vote on the same terms and conditions as the holders of our ordinary shares.

The depositary and its agents are not responsible for failing to carry out voting instructions or for the manner of carrying out voting instructions. This means that you may not be able to exercise your right to vote and you may have no recourse if the ordinary shares underlying your ADSs are not voted as you requested.

In order to give you a reasonable opportunity to instruct the depositary as to the exercise of voting rights relating to deposited securities, if we request the depositary to act, we will give the depositary notice of any such meeting and details concerning the matters to be voted at least 28 Business Days in advance of the meeting date.

Compliance with Regulations

Information Requests

Each ADS holder and beneficial owner shall (a) provide such information as we or the depositary may request pursuant to law, including, without limitation, relevant Australian law, any applicable law of the United States of America, our constitution, any resolutions of our Board of Directors adopted pursuant to such constitution, the requirements of any markets or exchanges upon which the ordinary shares, ADSs or ADRs are listed or traded, or to any requirements of any electronic book-entry system by which the ADSs or ADRs may be transferred, regarding the capacity in which they own or owned ADRs, the identity of any other persons then or previously interested in such ADRs and the nature of such interest, and any other applicable matters, and (b) be bound by and subject to applicable provisions of the laws of the Australia, our constitution, and the requirements of any markets or exchanges upon which the ADSs, ADRs or ordinary shares are listed or traded, or pursuant to any requirements of any electronic book-entry system by which the ADSs, ADRs or ordinary shares may be transferred, to the same extent as if such ADS holder or beneficial owner held ordinary shares directly, in each case irrespective of whether or not they are ADS holders or beneficial owners at the time such request is made.

Disclosure of Interests

Each ADS holder and beneficial owner shall comply with our requests pursuant to Australian law, the rules and requirements of the Nasdaq and any other stock exchange on which the ordinary shares are, or will be, registered, traded or listed or our constitution, which requests are made to provide information, inter alia, as to the capacity in which such ADS holder or beneficial owner owns ADS and regarding the identity of any other person interested in such ADS and the nature of such interest and various other matters, whether or not they are ADS holders or beneficial owners at the time of such requests.

Fees and Expenses

As an ADS holder, you will be required to pay the following service fees to the depositary bank and certain taxes and governmental charges (in addition to any applicable fees, expenses, taxes and other governmental charges payable on the deposited securities represented by any of your ADSs):

As an ADS holder, you will also be responsible for paying certain fees and expenses incurred by the depositary bank and certain taxes and governmental charges (in addition to any applicable fees, expenses, taxes and other governmental charges payable on the deposited securities represented by any of your ADSs) such as:

The depositary fees payable upon the issuance and cancellation of ADSs are typically paid to the depositary bank by the brokers (on behalf of their clients) receiving the newly issued ADSs from the depositary bank and by the brokers (on behalf of their clients) delivering the ADSs to the depositary bank for cancellation. The brokers in turn charge these fees to their clients. Depositary fees payable in connection with distributions of cash or securities to ADS holders and the depositary services fee are charged by the depositary bank to the holders of record of ADSs as of the applicable ADS record date.

The depositary fees payable for cash distributions are generally deducted from the cash being distributed or by selling a portion of distributable property to pay the fees. In the case of distributions other than cash (i.e., share dividends, rights), the depositary bank charges the applicable fee to the ADS record date holders concurrent with the distribution. In the case of ADSs registered in the name of the investor (whether certificated or uncertificated in direct registration), the depositary bank sends invoices to the applicable record date ADS holders. In the case of ADSs held in brokerage and custodian accounts (via DTC), the depositary bank generally collects its fees through the systems provided by DTC (whose nominee is the registered holder of the ADSs held in DTC) from the brokers and custodians holding ADSs in their DTC accounts. The brokers and custodians who hold their clients’ ADSs in DTC accounts in turn charge their clients’ accounts the amount of the fees paid to the depositary banks.

In the event of refusal to pay the depositary fees, the depositary bank may, under the terms of the deposit agreement, refuse the requested service until payment is received or may set off the amount of the depositary fees from any distribution to be made to the ADS holder.

The depositary may make payments to us or reimburse us for certain costs and expenses, by making available a portion of the ADS fees collected in respect of the ADR program or otherwise, upon such terms and conditions as we and the depositary bank agree from time to time.

Payment of Taxes

You will be responsible for any taxes or other governmental charges payable, or which become payable, on your ADSs or on the deposited securities represented by any of your ADSs. The depositary may refuse to register or transfer your ADSs or allow you to withdraw the deposited securities represented by your ADSs until such taxes or other charges are paid. It may apply payments owed to you or sell deposited securities represented by your ADSs to pay any taxes owed and you will remain liable for any deficiency. If the depositary sells deposited securities, it will, if appropriate, reduce the number of ADSs to reflect the sale and pay to you any net proceeds, or send to you any property, remaining after it has paid the taxes. You agree to indemnify us, the depositary, the custodian and each of our and their respective agents, directors, employees and affiliates for, and hold each of them harmless from, any claims with respect to taxes (including applicable interest and penalties thereon) arising from any refund of taxes, reduced rate of withholding at source or other tax benefit obtained for you. Your obligations under this paragraph shall survive any transfer of ADRs, any surrender of ADRs and withdrawal of deposited securities or the termination of the deposit agreement.

Reclassifications, Recapitalizations and Mergers

Amendment and Termination

How may the deposit agreement be amended?

We may agree with the depositary to amend the deposit agreement and the form of ADR without your consent for any reason. If an amendment adds or increases fees or charges, except for taxes and other governmental charges or expenses of the depositary for registration fees, facsimile costs, delivery charges or similar items, including expenses incurred in connection with foreign exchange control regulations and other charges specifically payable by ADS holders under the deposit agreement, or materially prejudices a substantial existing right of ADS holders, it will not become effective for outstanding ADSs until 30 days after the depositary notifies ADS holders of the amendment. At the time an amendment becomes effective, you are considered, by continuing to hold your ADSs, to agree to the amendment and to be bound by the ADRs and the deposit agreement as amended. If any new laws are adopted which would require the deposit agreement to be amended in order to comply therewith, we and the depositary may amend the deposit agreement in accordance with such laws and such amendment may become effective before notice thereof is given to ADS holders.

How may the deposit agreement be terminated?

The depositary will terminate the deposit agreement if we ask it to do so, in which case the depositary will give notice to you at least 90 days prior to termination. The depositary may also terminate the deposit agreement if the depositary has told us that it would like to resign, or if we have removed the depositary, and in either case we have not appointed a new depositary within 90 days. In either such case, the depositary must notify you at least 30 days before termination.

After termination, the depositary and its agents will do the following under the deposit agreement but nothing else: collect distributions on the deposited securities, sell rights and other property and deliver ordinary shares and other deposited securities upon cancellation of ADSs after payment of any fees, charges, taxes or other governmental charges. Six months or more after the date of termination, the depositary may sell any remaining deposited securities by public or private sale. After that, the depositary will hold the money it received on the sale, as well as any other cash it is holding under the deposit agreement, for the pro rata benefit of the ADS holders that have not surrendered their ADSs. It will not invest the money and has no liability for interest. After such sale, the depositary’s only obligations will be to account for the money and other cash. After termination, we shall be discharged from all obligations under the deposit agreement except for our obligations to the depositary thereunder.

Books of Depositary

The depositary will maintain ADS holder records at its depositary office. You may inspect such records at such office during regular business hours but solely for the purpose of communicating with other holders in the interest of business matters relating to the Company, the ADRs and the deposit agreement.

The depositary will maintain facilities in the Borough of Manhattan, The City of New York to record and process the issuance, cancellation, combination, split-up and transfer of ADRs.

These facilities may be closed at any time or from time to time when such action is deemed necessary or advisable by the depositary in connection with the performance of its duties under the deposit agreement or at our reasonable written request.

Limitations on Obligations and Liability

Limits on our Obligations and the Obligations of the Depositary and the Custodian; Limits on Liability to Holders of ADSs

The deposit agreement expressly limits our obligations and the obligations of the depositary and the custodian. It also limits our liability and the liability of the depositary. The depositary and the custodian:

The depositary and any of its agents also disclaim any liability (i) for any failure to carry out any instructions to vote, the manner in which any vote is cast or the effect of any vote or failure to determine that any distribution or action may be lawful or reasonably practicable or for allowing any rights to lapse in accordance with the provisions of the deposit agreement, (ii) the failure or timeliness of any notice from us, the content of any information submitted to it by us for distribution to you or for any inaccuracy of any translation thereof, (iii) any investment risk associated with the acquisition of an interest in the deposited securities, the validity or worth of the deposited securities, the credit-worthiness of any third party, (iv) for any tax consequences that may result from ownership of ADSs, ordinary shares or deposited securities, or (v) for any acts or omissions made by a successor depositary, provided that in connection with the issue out of which such potential liability arises the depositary performed its obligations without gross negligence or willful misconduct while it acted as depositary.

In the deposit agreement, we agree to indemnify the depositary under certain circumstances.

Jurisdiction and Arbitration

The laws of the State of New York govern the deposit agreement and the ADSs and we have agreed with the depositary that the federal or state courts in the City of New York shall have exclusive jurisdiction to hear and determine any dispute arising from or in connection with the deposit agreement and that the depositary will have the right to refer any claim or dispute arising from the relationship created by the deposit agreement to arbitration in accordance with the Commercial Arbitration Rules of the American Arbitration Association. The arbitration provision of the deposit agreement does not preclude you from pursuing claims under the Securities Act or the Exchange Act in federal courts. By agreeing to such arbitration provision, investors in the ADRs will also not be deemed to have waived Radiopharm’s or the Depositary’s compliance with the U.S. federal securities laws and the rules and regulations thereunder. In addition, under the terms of the deposit agreement, the arbitration provision does not preclude ADS holders from pursuing Securities Act or Exchange Act claims against Radiopharm or the Depositary in state courts.

Any legal suit, action or proceeding, including any claim under the Securities Act or the Exchange Act, against Radiopharm or the Depositary that arise out of or are based upon the Deposit Agreement, ownership of the ADSs or the transactions contemplated by the deposit agreement may only be instituted by holders of ADSs (including purchasers of ADSs in secondary transactions) in a state or federal court in the City of New York. Holders of ADSs irrevocably waive any objection which they may have to the laying of venue of any such proceeding, and submit to the exclusive jurisdiction of such courts in any such suit, action or proceeding. By agreeing to such provision, investors in the ADRs will not be deemed to have waived Radiopharm’s or the Depositary’s compliance with the U.S. federal securities laws and the rules and regulations thereunder. In addition, there is uncertainty as to whether a court outside of New York state would enforce such provision of the Deposit Agreement. Thus, ADS holders might be able to bring a legal suit, action or proceeding, including any claim under the Securities Act or the Exchange Act, against Radiopharm or the Depositary that arise out of or are based upon the Deposit Agreement, ownership of the ADSs or the transactions contemplated by the Deposit Agreement, in a court outside New York state if such court determines that such exclusive jurisdiction provision in the Deposit Agreement is unenforceable.

Jury Trial Waiver

The deposit agreement provides that each party to the deposit agreement (including each holder, beneficial owner and holder of interests in the ADRs) irrevocably waives, to the fullest extent permitted by applicable law, any right it may have to a trial by jury in any lawsuit or proceeding against us or the depositary arising out of or relating to our shares, the ADSs or the deposit agreement, including any claim under the U.S. federal securities laws. If we or the depositary opposed a jury trial demand based on the waiver, the court would determine whether the waiver was enforceable based on the facts and circumstances of that case in accordance with the applicable law. By agreeing to such provision, investors in the ADRs will not be deemed to have waived Radiopharm’s or the Depositary’s compliance with the U.S. federal securities laws and the rules and regulations thereunder. However, the jury trial waiver provision may limit access to information and lead to other imbalances of resources between Radiopharm and shareholders, and such provision may limit shareholders’ ability to bring a claim in a judicial forum that they find favorable.

Requirements for Depositary Actions

Before the depositary will issue, deliver or register a transfer of an ADS, split-up, subdivide or combine ADSs, make a distribution on an ADS, or permit withdrawal of ordinary shares, the depositary may require:

The depositary may refuse to issue and deliver ADSs or register transfers of ADSs generally when the register of the depositary or our transfer books are closed or at any time if the depositary or we determine that it is necessary or advisable to do so.

Your Right to Receive the Shares Underlying Your ADSs

You have the right to cancel your ADSs and withdraw the underlying ordinary shares at any time except:

The depositary shall not knowingly accept for deposit under the deposit agreement any ordinary shares or other deposited securities required to be registered under the provisions of the Securities Act, unless a registration statement is in effect as to such ordinary shares.

This right of withdrawal may not be limited by any other provision of the deposit agreement.

Direct Registration System

In the deposit agreement, all parties to the deposit agreement acknowledge that the DRS and Profile Modification System, or Profile, will apply to uncertificated ADSs upon acceptance thereof to DRS by DTC. DRS is the system administered by DTC pursuant to which the depositary may register the ownership of uncertificated ADSs, which ownership shall be evidenced by periodic statements issued by the depositary to the ADS holders entitled thereto. Profile is a required feature of DRS which allows a DTC participant, claiming to act on behalf of an ADS holder, to direct the depositary to register a transfer of those ADSs to DTC or its nominee and to deliver those ADSs to the DTC account of that DTC participant without receipt by the depositary of prior authorization from the ADS holder to register such transfer.

PLAN OF DISTRIBUTION

The Selling Shareholders and any of their pledgees, assignees and successors-in-interest, may, from time to time, sell any or all of their ordinary shares represented by ADSs covered by this prospectus on the Nasdaq Capital Market or any other stock exchange, market or trading facility on which the securities are traded or in private transactions. These sales may be at fixed or negotiated prices.

A Selling Shareholder may use any one or more of the following methods when selling securities:

The Selling Shareholders may also sell securities under Rule 144 or any other exemption from registration under the Securities Act, if available, rather than under this prospectus.

Broker-dealers engaged by the Selling Shareholders may arrange for other brokers-dealers to participate in sales. Broker-dealers may receive commissions or discounts from the Selling Shareholders (or, if any broker-dealer acts as agent for the purchaser of securities, from the purchaser) in amounts to be negotiated, but, except as set forth in a supplement to this Prospectus, in the case of an agency transaction not in excess of a customary brokerage commission in compliance with FINRA Rule 2440; and in the case of a principal transaction a markup or markdown in compliance with FINRA IM-2440.

In connection with the sale of the securities or interests therein, the Selling Shareholders may enter into hedging transactions with broker-dealers or other financial institutions, which may in turn engage in short sales of the securities in the course of hedging the positions they assume. The Selling Shareholders may also sell securities short and deliver these securities to close out their short positions, or loan or pledge the securities to broker-dealers that in turn may sell these securities. The Selling Shareholders may also enter into option or other transactions with broker-dealers or other financial institutions or create one or more derivative securities which require the delivery to such broker-dealer or other financial institution of securities offered by this prospectus, which securities such broker-dealer or other financial institution may resell pursuant to this prospectus (as supplemented or amended to reflect such transaction).

The Selling Shareholders and any broker-dealers or agents that are involved in selling the securities may be deemed to be “underwriters” within the meaning of the Securities Act in connection with such sales. In such event, any commissions received by such broker-dealers or agents and any profit on the resale of the securities purchased by them may be deemed to be underwriting commissions or discounts under the Securities Act. Each Selling Shareholder has informed Radiopharm that it does not have any written or oral agreement or understanding, directly or indirectly, with any person to distribute the securities.

Radiopharm is required to pay certain fees and expenses incurred by Radiopharm incident to the registration of the securities. Radiopharm has agreed to indemnify the Selling Shareholders against certain losses, claims, damages and liabilities, including liabilities under the Securities Act.

We agree to keep this prospectus effective until the earlier of (i) the date on which the securities may be resold by the Selling Shareholders without registration and without regard to any volume or manner-of-sale limitations by reason of Rule 144, without the requirement for Radiopharm to be in compliance with the current public information under Rule 144 under the Securities Act or any other rule of similar effect or (ii) all of the securities have been sold pursuant to this prospectus or Rule 144 under the Securities Act or any other rule of similar effect. The resale securities will be sold only through registered or licensed brokers or dealers if required under applicable state securities laws. In addition, in certain states, the resale securities covered hereby may not be sold unless they have been registered or qualified for sale in the applicable state or an exemption from the registration or qualification requirement is available and is complied with.

Under applicable rules and regulations under the Exchange Act, any person engaged in the distribution of the resale securities may not simultaneously engage in market making activities with respect to the ADSs for the applicable restricted period, as defined in Regulation M, prior to the commencement of the distribution. In addition, the Selling Shareholders will be subject to applicable provisions of the Exchange Act and the rules and regulations thereunder, including Regulation M, which may limit the timing of purchases and sales of the ADSs by the Selling Shareholders or any other person. We will make copies of this prospectus available to the Selling Shareholders and have informed them of the need to deliver a copy of this prospectus to each purchaser at or prior to the time of the sale (including by compliance with Rule 172 under the Securities Act).

EXPENSES

Set forth below is an itemization of the estimated expenses to be incurred in connection with the potential sale of the securities registered under this registration statement (other than any sales commissions or discounts, which will be paid by the Selling Shareholders). The amounts in the table below are estimates, with the exception of the SEC registration fee. These estimates do not include expenses related to offerings of particular securities. Each prospectus supplement describing an offering of ADSs will provide estimated expenses related to the ADSs offered under that prospectus supplement.

LEGAL MATTERS

The validity of the ADSs and certain other legal matters will be passed upon for us by Rimôn Law, our Australian counsel.

EXPERTS

The audited consolidated financial statements included in this prospectus and elsewhere in the registration statement have been so included in reliance upon the reports of Grant Thornton Audit Pty Ltd, independent registered public accountants, upon the authority of said firm as experts in accounting and auditing. 

ENFORCEABILITY OF CIVIL LIABILITIES

We are a company incorporated under the laws of Australia. Certain of our directors and officers and certain other persons named in this prospectus are citizens and residents of countries other than the United States and all or a significant portion of their assets may be located outside the United States. As a result, it may not be possible for you to:

You may also have difficulties enforcing in courts outside the United States judgments that are obtained in U.S. courts against any of our non-U.S. resident directors or us, including actions under the civil liability provisions of the U.S. securities laws. Australia has developed a different body of securities laws as compared to the United States and may provide protections for investors to a lesser extent.

It may be difficult (or impossible in some circumstances) for Australian companies to commence court actions or proceedings before the federal courts of the United States or other jurisdiction in which it conducts business or has assets. This may make it difficult for us to recover amounts we are owed and to generally enforce our rights, which may have an adverse impact on our operations and financial standing. Even where we are able to enforce our rights, this may be costly and/or time consuming, risky, and may not guarantee recovery, which in turn may have an adverse impact on our operations and financial standing. With that noted, there are no treaties between Australia and the United States that would affect the recognition or enforcement of foreign judgments in Australia. We also note that investors may be able to bring an original action in an Australian court against us to enforce liabilities based in part upon U.S. federal securities laws.

INFORMATION INCORPORATED BY REFERENCE

The SEC allows us to “incorporate by reference” the information into this document prior to the completion of this offering. This means that we can disclose important information to you by referring you to another document that we have filed separately with the SEC. The information incorporated by reference is considered a part of this prospectus and you should read that information carefully. Certain information in this prospectus supersedes information incorporated by reference that we filed with the SEC prior to the date of this prospectus. Certain information that we file later with the SEC will automatically update and supersede the information in this prospectus. Any statement so modified or superseded shall not be deemed, except as so modified or superseded, to constitute a part of this prospectus.

We incorporate by reference into this prospectus and the registration statement of which it is a part the following documents, including any amendments to such filings: 

We have not authorized anyone else to provide you with additional or different information to the information included in and incorporated by reference to this prospectus and any prospectus supplement. You should rely only on the information provided by and incorporated by reference to this prospectus and any prospectus supplement.

Upon written or oral request, we shall provide without charge to each person to whom a copy of this prospectus is delivered a copy of any or all of the documents that are incorporated by reference to this prospectus but not delivered with this prospectus. You may request a copy of these filings by contacting us at Level 3, 62 Lygon Street, Carlton VIC 3053, Australia, Phone: +61 3 9824 5254. Our website address is www.radiopharmtheranostics.com.

WHERE YOU CAN FIND MORE INFORMATION

We are subject to periodic reporting and other informational requirements of the Exchange Act as applicable to foreign private issuers. We also have a registration statement on Form 20-F filed with the SEC, including relevant exhibits, under the Exchange Act with respect to the ADSs that may offered by this prospectus. This prospectus, which constitutes a part of the registration statement, does not contain all of the information set forth in the registration statement or the exhibits. As this prospectus does not contain all of the information contained in the registration statement, you should read the registration statement and its exhibits for further information with respect to us and our securities. All information we file with the SEC is available through the SEC’s Electronic Data Gathering, Analysis and Retrieval system, which may be accessed through the SEC’s website at www.sec.gov. You can request copies of these documents upon payment of a duplicating fee, by writing to the SEC. Please visit the SEC’s website at www.sec.gov for further information on the SEC’s Public Reference Room.

Our Annual Report on Form 20-F for fiscal year 2025 has been filed with the SEC and an Annual Report on Form-20-F for subsequent years will be due within four months following the fiscal year end.

We are not required to disclose certain other information that is required from U.S. domestic issuers. As a foreign private issuer, we are exempt under the Exchange Act from, among other things, the rules prescribing the furnishing and content of proxy statements, and our executive officers, directors and principal shareholders are exempt from the reporting and short-swing profit recovery provisions contained in Section 16 of the Exchange Act and Regulation FD (Fair Disclosure), which was adopted to ensure that select groups of investors are not privy to specific information about an issuer before other investors.

We are, however, still subject to the anti-fraud and anti-manipulation rules of the SEC, such as Rule 10b-5. Since many of the disclosure obligations required of us as a foreign private issuer are different than those required by companies filing as a domestic issuer, our shareholders, potential shareholders and the investing public in general should not expect to receive information about us in the same amount and at the same time as information is received from, or provided by, companies filing as a domestic issuer. We are liable for violations of the rules and regulations of the SEC that apply to us as a foreign private issuer.

We will also be subject to the informational requirements of the ASX. Our public filings with the ASX are electronically available from the ASX website (www.asx.com.au).

Only the specific documents incorporated by reference above, or incorporated by reference in any prospectus supplement, are to be deemed incorporated by reference into this prospectus and the registration statement of which it is a part. No information available on or through our website, or any other website reference herein, shall be deemed incorporated by reference into this prospectus.

DISCLOSURE OF SEC’S POSITION ON INDEMNIFICATION FOR
SECURITIES ACT LIABILITY

Insofar as indemnification for liabilities arising under the Securities Act may be permitted to directors, officers or controlling persons of Radiopharm, we have 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.

Radiopharm Theranostics Limited

140,999,999 Ordinary Shares represented by
470,000 American Depositary Shares

140,999,999 Ordinary Shares underlying Options

Prospectus

                 , 2025

PART II

INFORMATION NOT REQUIRED IN THE PROSPECTUS

Item 8. Indemnification of Directors and Officers.

Australian law. Australian law provides that a company or a related body corporate of the company may provide for indemnification of officers and directors, except to the extent of any of the following liabilities incurred as an officer or director of the company:

Constitution. Our Constitution provides, except to the extent prohibited by the law and the Corporations Act, for the indemnification of any current or former director, secretary or executive officer of the Company, or a subsidiary of the Company against every liability incurred by that person in such capacity, and for all legal costs incurred in defending or resisting (or otherwise in connection with) proceedings, whether civil or criminal or of an administrative or investigatory nature, in which the person becomes involved because of that capacity, except where the Company is prohibited by statute to indemnify such person or where an indemnity would be made void by statute.

SEC Position. Insofar as indemnification for liabilities arising under the Securities Act of 1933 may be permitted to directors, officers or persons controlling us pursuant to the foregoing provisions, we have been informed that in the opinion of the Securities and Exchange Commission, such indemnification is against public policy as expressed in the Securities Act and is therefore unenforceable.

Item 9. Exhibits.

The exhibits to this registration statement are listed in the Index to Exhibits below.

Item 10. Undertakings.

The undersigned registrant hereby undertakes:

(1) To file, during any period in which offers or sales are being made, a post-effective amendment to this registration statement:

(i) To include any prospectus required by Section 10(a)(3) of the Securities Act;

(ii) To reflect in the prospectus any facts or events arising after the effective date of the registration statement (or the most recent post-effective amendment thereof) which, individually or in the aggregate, represent a fundamental change in the information set forth in the registration statement. Notwithstanding the foregoing, any increase or decrease in volume of securities offered (if the total dollar value of securities offered would not exceed that which was registered) and any deviation from the low or high end of the estimated maximum offering range may be reflected in the form of prospectus filed with the Commission pursuant to Rule 424(b) if, in the aggregate, the changes in volume and price represent no more than a 20 percent change in the maximum aggregate offering price set forth in the “Calculation of Registration Fee” table in the effective registration statement;

(iii) To include any material information with respect to the plan of distribution not previously disclosed in the registration statement or any material change to such information in the registration statement; provided, however, that paragraphs (i), (ii) and (iii) of this section 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 Commission by the registrant pursuant to Section 13 or Section 15(d) of the Securities Exchange Act of 1934, as amended (“Exchange Act”) that are incorporated by reference in the registration statement, or is contained in a form of prospectus filed pursuant to Rule 424(b) that is part of the registration statement.

(2) That, for the purpose of determining any liability under the Securities Act, each such post-effective amendment shall be deemed to be a new registration statement relating to the securities offered therein, and the offering of such securities at that time shall be deemed to be the initial bona fide offering thereof.

(3) To remove from registration by means of a post-effective amendment any of the securities being registered which remain unsold at the termination of the offering.

(4) To file a post-effective amendment to the registration statement to include any financial statements required by Item 8.A. of Form 20-F at the start of any delayed offering or throughout a continuous offering. Financial statements and information otherwise required by Section 10(a)(3) of the Act need not be furnished, provided that the registrant includes in the prospectus, by means of a post-effective amendment, financial statements required pursuant to this paragraph (a)(4) and other information necessary to ensure that all other information in the prospectus is at least as current as the date of those financial statements. Notwithstanding the foregoing, a post-effective amendment need not be filed to include financial statements and information required by Section 10(a)(3) of the Act or Item 8.A. of Form 20-F if such financial statements and information are contained in periodic reports filed with or furnished to the Commission by the registrant pursuant to Section 13 or Section 15(d) of the Securities Exchange Act of 1934 that are incorporated by reference in the registration statement.

(5) That, for the purpose of determining liability under the Securities Act to any purchaser:

(i) Each prospectus filed by the registrant pursuant to Rule 424(b)(3) shall be deemed to be part of the registration statement as of the date the filed prospectus was deemed part of and included in the registration statement.

(ii) Each prospectus required to be filed pursuant to Rule 424(b)(2), (b)(5), or (b)(7) as part of a registration in reliance on Rule 430B relating to an offering made pursuant to Rule 415(a)(1)(i), (vii), or (x) for the purpose of providing the information required by Section 10(a) of the Securities Act shall be deemed to be part of and included in the registration statement as of the earlier of the date such form of prospectus is first used after effectiveness or the date of the first contract of sale of securities in the offering described in the prospectus. As provided in Rule 430B, for liability purposes of the issuer and any person that is at that date an underwriter, such date shall be deemed to be a new effective date of the registration statement relating to the securities in the registration statement to which that prospectus relates, and the offering of such Securities at that time shall be deemed to be the initial bona fide offering thereof. Provided, however, that no statement made in a registration statement or prospectus that is part of the registration statement or made in a document incorporated or deemed incorporated by reference into the registration statement or prospectus that is part of the registration statement will, as to a purchaser with a time of contract of sale prior to such effective date, supersede or modify any statement that was made in the registration statement or prospectus that was part of the registration statement or made in any such document immediately prior to such effective date.

(6) That, for the purpose of determining liability of the registrant under the Securities Act to any purchaser in the initial distribution of the securities, the undersigned registrant undertakes that in a primary offering of securities of the undersigned registrant pursuant to this registration statement, regardless of the underwriting method used to sell the securities to the purchaser, if the securities are offered or sold to such purchaser by means of any of the following communications, the undersigned registrant will be a seller to the purchaser and will be considered to offer or sell such securities to such purchaser:

(i) Any preliminary prospectus or prospectus of the undersigned registrant relating to the offering required to be filed pursuant to Rule 424;

(ii) Any free writing prospectus relating to the offering prepared by or on behalf of the undersigned registrant or used or referred to by the undersigned registrant;

(iii) The portion of any other free writing prospectus relating to the offering containing material information about the undersigned registrant or its securities provided by or on behalf of the undersigned registrant; and

(iv) Any other communication that is an offer in the offering made by the undersigned registrant to the purchaser.

The undersigned registrant hereby undertakes that, for purposes of determining any liability under the Securities Act, each filing of the registrant’s annual report pursuant to Section 13(a) or Section 15(d) of the Exchange Act (and, where applicable, each filing of an employee benefit plan’s annual report pursuant to Section 15(d) of the Exchange Act) that is incorporated by reference in the registration statement shall be deemed to be a new registration statement relating to the securities offered therein, and the offering of such securities at that time shall be deemed to be the initial bona fide offering thereof.

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 Securities and Exchange Commission 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.

The undersigned registrant hereby undertakes that:

(1) For purposes of determining any liability under the Securities Act, the information omitted from the form of prospectus filed as part of this registration statement in reliance upon Rule 430A and contained in a form of prospectus filed by the registrant pursuant to Rule 424(b)(1) or (4) or 497(h) under the Securities Act shall be deemed to be part of this registration statement as of the time it was declared effective.

(2) For the purpose of determining any liability under the Securities Act, each post-effective amendment that contains a form of prospectus shall be deemed to be a new registration statement relating to the securities offered therein, and the offering of such securities at that time shall be deemed to be the initial bona fide offering thereof.

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 F-3 and has duly caused this registration statement to be signed on its behalf by the undersigned, thereunto duly authorized, in the City of Livingston, New Jersey, on December 17, 2025.

POWER OF ATTORNEY

KNOW ALL PERSONS BY THESE PRESENTS, that each individual whose signature appears below hereby constitutes and appoints Riccardo Canevari and Paul Hopper, as his or her true and lawful attorneys-in-fact and agents, with full power of substitution, for him or her and in his or her name, place and stead, in any and all capacities, in connection with this registration statement, including to sign file in the name and on behalf of the undersigned as director or officer of the registrant any and all amendments or supplements (including any and all prospectus supplements, stickers and post effective amendments) to this registration statement, with all exhibits thereto and other documents in connection therewith, with the Securities and Exchange Commission and any applicable securities exchange, securities self-regulatory body or other regulatory authority, granting unto said attorneys-in-fact and agents, and each of them (with full power to act alone), full power and authority to do and perform each and every act and things requisite or necessary to be done in and about the premises, 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 his, her or their substitute or substitutes, may lawfully do or cause to be done by virtue hereof.

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

SIGNATURE OF AUTHORIZED REPRESENTATIVE OF THE REGISTRANT

Pursuant to the Securities Act of 1933, the undersigned, the duly authorized representative in the United States of Radiopharm Theranostics Limited, has signed this registration statement in City of Livingston, New Jersey on December 17, 2025.

EXHIBIT INDEX