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UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
Form 6-K
REPORT OF FOREIGN PRIVATE ISSUER
PURSUANT TO RULE 13a-16 OR 15d-16 UNDER
THE SECURITIES EXCHANGE ACT OF 1934
For the Month of September 2025
Commission File Number: 001-41621
RADIOPHARM THERANOSTICS LIMITED
(Name of Registrant)
Level 3, 62 Lygon Street, Carlton South, Victoria, 3053, Australia
(Address of principal executive office)
Indicate by check mark whether the registrant files or will file annual reports under cover of Form 20-F or Form 40-F.
Form 20-F ☒ Form 40-F ☐
Indicate by check mark whether by furnishing the information contained in this Form, the registrant is also thereby furnishing the information to the Commission pursuant to Rule 12g3-2(b) under the Securities Exchange Act of 1934.
Yes ☐ No ☒
If “Yes” is marked, indicate below the file number assigned to the registrant in connection with Rule 12g3-2(b): 82-Radiopharm Theranostics Limited (the “Company”) published one announcement (the “Public Notice”) to the Australian Securities Exchange on September 30, 2025 titled:
RADIOPHARM THERANOSTICS LIMITED
EXPLANATORY NOTE
| - | “Radiopharm Theranostics Partners with Starpharma on Research” |
A copy of the Public Notice is attached as an exhibit to this report on Form 6-K.
This report on Form 6-K (including the exhibit hereto) shall not be deemed to be “filed” for purposes of the Securities Exchange Act of 1934, as amended (the “Exchange Act”) and shall not be incorporated by reference into any filing under the Securities Act of 1933, as amended, except as shall be expressly set forth by specific reference in such filing.
EXHIBITS
| Exhibit Number |
Description | |
| 99.1 | Radiopharm Theranostics Partners with Starpharma on Research |
SIGNATURE
Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.
| RADIOPHARM THERANOSTICS LIMITED | ||
| Date: September 30, 2025 | By: | /s/ Phillip Hains |
| Phillip Hains | ||
| Company Secretary | ||
3
Exhibit 99.1
| ASX ANNOUNCEMENT |  |
Radiopharm Theranostics Partners with Starpharma on Research and Option Agreement to Develop a Novel Radiotherapy Asset
Program to incorporate Radiopharm’s Theranostics’ radiopharmaceutical molecule with Starpharma’s proprietary DEP® platform technology to develop and manufacture a new drug conjugate
Sydney, Australia – September 30, 2025 – Radiopharm Theranostics (ASX: RAD, Nasdaq: RADX, “Radiopharm” or the “Company”), a clinical-stage biopharmaceutical company focused on developing innovative oncology radiopharmaceuticals for areas of high unmet medical need, today announced the signing of a research and option agreement with Starpharma (ASX: SPL, US OTC: SPHRY), to develop and manufacture a radiopharmaceutical molecule utilising Starpharma’s proprietary DEP® platform technology. Starpharma will also grant Radiopharm an exclusive option to license the asset developed through this collaboration, subject to successful development and manufacturing.
Radiopharm Theranostic’s Chief Executive Officer, Riccardo Canevari, commented:
“We are excited to collaborate with Starpharma to explore the potential of combining Radiopharm’s novel radiotherapeutic molecule with their cutting-edge DEP® platform. This partnership represents a strategic step forward in our mission to develop highly targeted and effective radiopharmaceuticals for cancer treatment.”
Cheryl Maley, Starpharma Chief Executive Officer, commented:
“This research and option agreement with Radiopharm Theranostics is the first Star Navigator program to progress into a formal research collaboration, marking a key milestone. We are excited by the opportunity to advance this partnership with Radiopharm and to continually demonstrate how Starpharma’s DEP® platform can help shape the future of targeted cancer therapies.”
Terms of the Research & Option Agreement
| ● | Starpharma will apply its proprietary DEP® platform technology to develop a drug conjugate that incorporates a radiopharmaceutical molecule under development by Radiopharm. |
| ● | Starpharma will receive R&D service and manufacturing fees. |
| ● | Starpharma will grant Radiopharm an exclusive option to license the asset developed through this collaboration, subject to successful development and manufacturing. Should Radiopharm exercise its right to exclusivity, an option fee of AUD $0.5 million will be payable to Starpharma and a subsequent exclusive license agreement would be entered into. Under the license agreement, Starpharma would receive an upfront payment of AUD $2 million and be eligible to receive up to $89 million in success-based development, regulatory, and commercial milestones. In addition to this amount, Starpharma is eligible to receive royalties on net sales. |
Radiopharm Theranostics Limited
Suite 1, Level 3, 62 Lygon Street, Carlton South VIC 3053 Australia
ABN: 57 647 877 889
| ASX ANNOUNCEMENT | |
About Starpharma
Starpharma (ASX: SPL, OTCQX: SPHRY) is an innovative biotechnology company with two decades of experience in advancing dendrimer technology from the lab to the patient. Our mission is to help patients with significant illnesses, such as cancer, achieve improved health outcomes and quality of life through the application of our unique dendrimer technology. Dendrimers are precise, synthetically manufactured, nanoscale molecules. Their unique properties—including their size, structure, high degree of branching, polyvalency, and water solubility—are advantageous in medical and pharmaceutical applications.
Starpharma’s portfolio of dendrimer-based products includes three clinical-stage DEP® (dendrimer enhanced product) assets, preclinical radiopharmaceutical assets, research collaborations, and three commercially marketed over-the-counter (OTC) products. For more information about Starpharma, visit www.starpharma.com or connect with Starpharma on LinkedIn.
About Radiopharm Theranostics
Radiopharm Theranostics is a clinical stage radiotherapeutics company developing a world-class platform of innovative radiopharmaceutical products for diagnostic and therapeutic applications in areas of high unmet medical need. Radiopharm is listed on ASX (RAD) and on NASDAQ (RADX). The company has a pipeline of distinct and highly differentiated platform technologies spanning peptides, small molecules and monoclonal antibodies for use in cancer. The clinical program includes one Phase 2 and three Phase 1 trials in a variety of solid tumor cancers including lung, breast, and brain. Learn more at radiopharmtheranostics.com.
Authorized on behalf of the Radiopharm Theranostics Board of Directors by Executive Chairman Paul Hopper.
For more information:
Investors:
Riccardo Canevari
CEO & Managing Director
P: +1 862 309 0293
E: rc@radiopharmtheranostics.com
Anne Marie Fields
Precision AQ (formerly Stern IR)
E: annemarie.fields@precisionaq.com
Media:
Matt Wright
NWR Communications
P: +61 451 896 420
E: matt@nwrcommunications.com.au
Follow Radiopharm Theranostics:
Website – https://radiopharmtheranostics.com/
X – https://x.com/TeamRadiopharm
LinkedIn – https://www.linkedin.com/company/radiopharm-theranostics/
InvestorHub – https://investorhub.radiopharmtheranostics.com/
Radiopharm Theranostics Limited
Suite 1, Level 3, 62 Lygon Street, Carlton South VIC 3053 Australia
ABN: 57 647 877 889