6-K
Radiopharm Theranostics Ltd (RADX)
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 June 2026
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 ☐
RADIOPHARM THERANOSTICS LIMITED
EXPLANATORY NOTE
Radiopharm Theranostics Limited (the “Company”) published one announcement (the “Public Notice”) to the Australian Securities Exchange on June 3, 2026 titled:
“Notification of cessation of securities - RAD”
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 any exhibit hereto) shall not be deemed to be “filed” for purposes of the Securities Exchange Act of 1934 and shall not be incorporated by reference into any registration statement or prospectus under the Securities Act of 1933, except as shall be expressly set forth by specific reference in such registration statement or prospectus.
1
EXHIBITS
| Exhibit <br><br>Number | Description |
|---|---|
| 99.1 | Notification of cessation of securities - RAD |
2
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: June 3, 2026 | By: | /s/ Nathan Jong |
| Nathan Jong | ||
| Company Secretary |
3
Exhibit 99.1
 |
Appendix 3H - Notification of cessation of securities |
|---|
Announcement Summary
Entity name
RADIOPHARM THERANOSTICS LIMITED
Announcement Type
New announcement
Date of this announcement
Wednesday June 03, 2026
Details of +securities that have ceased
| ASX +securitycode | Security description | Number of +securities thathave ceased | The +securities haveceased due to | Date of cessation |
|---|---|---|---|---|
| RADAN | OPTION EXPIRING VARIOUS DATES EX VARIOUS PRICES | 505,598 | Expiry of option or other convertible security without exercise or conversion | 31/05/2026 |
Refer to next page for full details of the announcement
| Appendix 3H - Notification of cessation of securities | 1 / 4 |
| --- | --- |
| | Appendix 3H - Notification of cessation of securities |
| --- | --- |
Part 1 - Announcement Details
| 1.1 | Name of +Entity |
|---|
RADIOPHARM THERANOSTICS LIMITED
We (the entity named above) provide the following information about our issued capital.
| 1.2 | Registered Number Type | Registration Number |
|---|---|---|
| ACN | 647877889 | |
| 1.3 | ASX issuer code | |
| --- | --- |
RAD
| 1.4 | The announcement is |
|---|
New announcement
| 1.5 | Date of this announcement |
|---|
3/6/2026
| Appendix 3H - Notification of cessation of securities | 2 / 4 |
| --- | --- |
| | Appendix 3H - Notification of cessation of securities |
| --- | --- |
Part 2 - Details of +equity securities or +debt securities that have ceased
ASX +Security Code and Description
RADAN : OPTION EXPIRING VARIOUS DATES EX VARIOUS PRICES
Unquoted+equity securities that have ceased
Number of securities that have ceased
505,598
Reason for cessation
Expiry of option or other convertible security without exercise or conversion
| Date of cessation | Is the entity paying any consideration for the cessation? |
|---|---|
| 31/5/2026 | No |
Any other information the entity wishes to notify to ASX about the cessation?
| Appendix 3H - Notification of cessation of securities | 3 / 4 |
| --- | --- |
| | Appendix 3H - Notification of cessation of securities |
| --- | --- |
Part 3 - Issued capital following changes
Following the cessation of the +securities the subjectof this notification, the issued capital of the entity will comprise:
The figures in parts 3.1 and 3.2 below are automatically generated and may not reflect the entity's current issued capital if other Appendix 2A, Appendix 3G or Appendix 3H forms are currently with ASX for processing.
| 3.1 | Quoted +equity securities and +debt securities (totalnumber of each +class of +securities quoted on ASX) | |
|---|---|---|
| ASX +security code and description | Total<br><br> number of <br> +securities <br><br>on issue | |
| --- | --- | --- |
| RADO : OPTION EXPIRING 30-NOV-2026 | 79,352,040 | |
| RAD : ORDINARY FULLY PAID | 3,544,216,160 | |
| RADOA : OPTION EXPIRING 24-AUG-2026 | 818,890,534 | |
| RADOB : OPTION EXPIRING 31-OCT-2027 | 1,179,266,658 | |
| 3.2 | Unquoted +equity securities (total number of each +classof +equity securities issued but not quoted on ASX) | |
| --- | --- |
| ASX +security code and description | Total<br><br> number of<br><br> +securities<br><br> on issue | |
|---|---|---|
| RADAK : OPTION EXPIRING 01-JUN-2027 EX 0.60 | 1,666,500 | |
| RADAN : OPTION EXPIRING VARIOUS DATES EX VARIOUS PRICES | 421,025,268 | |
| RADAJ : OPTION EXPIRING 01-JUL-2027 EX 0.17 | 13,137,976 | |
| RADAF : OPTION EXPIRING 25-NOV-2026 RESTRICTED | 8,666,678 | |
| RADAG : OPTION EXPIRING 25-NOV-2026 EX 0.60 | 5,066,672 | |
| RADAI : OPTION EXPIRING 27-MAY-2027 EX 0.60 | 740,000 | |
| RADAP : OPTION EXPIRING 24-APR-2028 EX 0.09 | 8,955,224 |
All values are in US Dollars.
Note: the figures stated in the tables above are used to calculate the total market capitalisation of the entity published by ASX from time to time. The table will not include those classes of +securities that have ceased or lapsed in their entirety in ASX records before the announcement date described in Q1.5, even if the entity has advised ASX of a change to that class of +security in Part 2 of this form.
| Appendix 3H - Notification of cessation of securities | 4 / 4 |
| --- | --- |