Radiopharm Theranostics Ltd

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 20-F

(Mark One)

☐ REGISTRATION STATEMENT PURSUANT TO SECTION 12(b) OR (g) OF THE SECURITIES EXCHANGE ACT OF 1934

OR

☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the fiscal year ended June 30,2025

OR

☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

OR

☐ SHELL COMPANY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

Date of event requiring this shell company report _________

Commission file number 001-41621

(Exact name of Registrant as specified in its charter)

n/a

(translation of Registrant’s name into English)

(Jurisdiction of incorporation or organization)

Level 3,62 Lygon Street

Carlton VIC 3053

(Address of principal executive offices)

Riccardo Canevari, Chief Executive Officer

Level 3,62 Lygon Street

Carlton VIC 3053

Phone:+61 3 9824 5254 E-mail: rc@radiopharmtheranostics.com

(Name, Telephone, E-mail and/or Facsimile number and Address of Company Contact Person)

Securities registered or to be registered pursuant to Section 12(b) of the Act:

Securities registered or to be registered pursuant to Section 12(g) of the Act.None

Securities for which there is a reporting obligation pursuant to Section 15(d) of the Act.None

The number of ordinary shares outstanding as of June 30, 2025 was 2,364,949,502.

Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act.☐ Yes☒ No

If this report is an annual or transition report, indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934.☐ Yes☒ No

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.☒ Yes ☐ No

Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit such files).☒ Yes ☐ No

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

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 13(a) of the Exchange Act.☐

Indicate by check mark whether the registrant has filed a report on and attestation to its management’s assessment of the effectiveness of its internal control over financial reporting under Section 404(b) of the Sarbanes-Oxley Act (15 U.S.C. 7262(b)) by the registered public accounting firm that prepared or issued its audit report.☐

If securities are registered pursuant to Section 12(b) of the Act, indicate by check mark whether the financial statements of the registrant included in the filing reflect the correction of an error to previously issued financial statements.☐

Indicate by check mark whether any of those error corrections are restatements that required a recovery analysis of incentive-based compensation received by any of the registrant’s executive officers during the relevant recovery period pursuant to §240.10D-1(b).☐

Indicate by check mark which basis of accounting the registrant has used to prepare the financial statements included in this filing:

If “Other” has been checked in response to the previous question, indicate by check mark which financial statement item the registrant has elected to follow.☐ Item 17☐ Item 18

If this is an annual report, indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).☐ Yes☒ No

TABLE OF CONTENTS

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GENERAL INFORMATION

Radiopharm Theranostics Limited was incorporated under the laws of the Commonwealth of Australia in February 2021. Our ordinary shares are listed on the ASX under the symbol “RAD”. We filed a registration statement on Form 20-F with respect to our ordinary shares, as represented by American Depositary Shares, or ADSs, with the U.S. Securities and Exchange Commission, that was declared effective on November 27, 2024. Our ADSs, each of which represents 300 of our ordinary shares, are listed on the Nasdaq Capital Market under the symbol “RADX”. Deutsche Bank Trust Company Americas acts as our depositary and registers and delivers our ADSs. Except where the context otherwise requires or where otherwise indicated, the terms “we,” “us,” “our”, “Radiopharm” and the “Company” mean Radiopharm Theranostics Limited and its subsidiaries, unless otherwise indicated.

FINANCIAL AND OTHER INFORMATION

Our consolidated financial statements appearing in this Annual Report on Form 20-F are prepared in Australian dollars and in accordance with the International Financial Reporting Standards, or IFRS, as issued by the International Accounting Standards Board, or IASB. Our consolidated financial statements appearing in this Annual Report on Form 20-F comply with both the IFRS and Australian Accounting Standards. In this Annual Report, all references to “U.S. dollars” or “US$” are to the currency of the United States and all references to “Australian dollars” or “$” or “A$” are to the currency of Australia.

In this Annual Report, “fiscal year” refers to the period between July 1 and June 30 of the following year. For instance, the term “fiscal 2025” refers to our fiscal year ending June 30, 2025.

Statements made in this Annual Report on Form 20-F concerning the contents of any contract, agreement or other document are summaries of such contracts, agreements or documents and are not complete descriptions of all of their terms. If we filed any of these documents as an exhibit to this Annual Report or to any registration statement that we previously filed, you may read the document itself for a complete description of its terms.

SPECIAL NOTE REGARDING FORWARD-LOOKING STATEMENTS

Except for the historical information contained in this Annual Report on Form 20-F, the statements contained in this Annual Report on Form 20-F are “forward-looking statements” which reflect our current view with respect to future events and financial results. We urge you to consider that statements which use the terms “anticipate,” “believe,” “do not believe,” “expect,” “plan,” “intend,” “estimate,” and similar expressions are intended to identify forward-looking statements and these forward-looking statements, include, without limitation, any statements relating to:

We remind investors that forward-looking statements are merely predictions and therefore inherently subject to uncertainties and other factors and involve known and unknown risks that could cause the actual results, performance, levels of activity, our achievements or industry results, to be materially different from any future results, performance, levels of activity, or our achievements expressed or implied by such forward-looking statements. Investors are cautioned not to place undue reliance on these forward-looking statements, which speak only as of the date hereof. Except as required by applicable law, including the securities laws of the United States, we undertake no obligation to publicly release any update or revision to any forward-looking statements to reflect new information, future events or circumstances, or otherwise after the date hereof. Please see the Risk Factors section that appears in “Item 3. Key Information – D. Risk Factors.”

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