# EDGAR Filing Document

**Accession Number:** 0001949257
**File Stem:** 0001213900-26-052518
**Filing Date:** 2026-5
**Character Count:** 6072
**Document Hash:** 92887c240949e91bf48d220c34fb0c1e
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001213900-26-052518.hdr.sgml**: 20260506

**ACCESSION NUMBER**: 0001213900-26-052518

**CONFORMED SUBMISSION TYPE**: 3

**PUBLIC DOCUMENT COUNT**: 1

**CONFORMED PERIOD OF REPORT**: 20260318

**FILED AS OF DATE**: 20260506

**DATE AS OF CHANGE**: 20260506

**REPORTING-OWNER**: 

**OWNER DATA:**
- **COMPANY CONFORMED NAME:** HOPPER PAUL
- **CENTRAL INDEX KEY:** 0002045367

**ORGANIZATION NAME:**

**FILING VALUES:**
- **FORM TYPE:** 3
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-41621
- **FILM NUMBER:** 26945636

**MAIL ADDRESS:**
- **STREET 1:** LEVEL 3, 62 LYGON STREET
- **CITY:** CARLTON
- **STATE:** C3
- **ZIP:** VIC 3053
**ISSUER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** Radiopharm Theranostics Ltd
- **CENTRAL INDEX KEY:** 0001949257
- **STANDARD INDUSTRIAL CLASSIFICATION:** PHARMACEUTICAL PREPARATIONS [2834]
- **ORGANIZATION NAME:** 03 Life Sciences
- **EIN:** 000000000
- **STATE OF INCORPORATION:** C3
- **FISCAL YEAR END:** 0630

**BUSINESS ADDRESS:**
- **ADDRESS IS A NON US LOCATION:** YES
- **STREET 1:** LEVEL 3, 62 LYGON STREET
- **CITY:** CARLTON VIC
- **PROVINCE COUNTRY:** C3
- **ZIP:** 3053
- **BUSINESS PHONE:** 61 3 9824 5254

**MAIL ADDRESS:**
- **ADDRESS IS A NON US LOCATION:** YES
- **STREET 1:** LEVEL 3, 62 LYGON STREET
- **CITY:** CARLTON VIC
- **PROVINCE COUNTRY:** C3
- **ZIP:** 3053

### UNITED STATES SECURITIES AND EXCHANGE COMMISSION
**Washington, D.C. 20549**

## FORM 3

### INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

[ ] Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

---

| | | |
|:---|:---|:---|
| **1. Name and Address of Reporting Person**<sup>*</sup><br>HOPPER PAUL<br><sub>(Last) (First) (Middle)</sub><br>SUITE 1 LEVEL 3, 62 LYGON STREET<br><sub>(Street)</sub><br>CARLTON SOUTH, VICTORIA, AUSTRALIA 3053<br><sub>(City) (State) (Zip)</sub> | **3. Issuer Name and Ticker or Trading Symbol**<br>Radiopharm Theranostics Ltd [ RADX ] | **5. If Amendment, Date of Original Filed (Month/Day/Year)**<br>  |
| **2. Date of Event Requiring Statement (Month/Day/Year)**<br>2026-03-18 | **4. Relationship of Reporting Person(s) to Issuer**<br>(Check all applicable)<br>[X] Director   [ ] 10% Owner<br>[ ] Officer (give title below)   [ ] Other (specify below)<br>_ _ | **6. Individual or Joint/Group Filing (Check Applicable Line)**<br>[X] Form filed by One Reporting Person<br>[ ] Form filed by More than One Reporting Person |

---

## Table I - Non-Derivative Securities Beneficially Owned

---

|  |  |  |  |
| --- | --- | --- | --- |
| 1. Title of Security | 2. Amount of Securities Beneficially Owned | 3. Ownership Form | 4. Nature of Indirect Beneficial Ownership |
| Ordinary Shares | 53900000 | D |  |
| Ordinary Shares | 250000 | I | Held by Deborah Coleman, who is Mr. Hopper's spouse. |
| Ordinary Shares | 93571428 | I | Held through Kilinwata Investments Pty Ltd, of which Mr. Hopper is the sole Shareholder and Director |

---

## Table II - Derivative Securities Beneficially Owned

---

|  |  |  |  |  |  |  |  |
| --- | --- | --- | --- | --- | --- | --- | --- |
| 1. Title of Derivative Security | 2. Date Exercisable and Expiration Date (Month/Day/Year) | 2. Date Exercisable and Expiration Date (Month/Day/Year) | 3. Title and Amount of Underlying Securities | 3. Title and Amount of Underlying Securities | 4. Conversion or Exercise Price | 5. Ownership Form | 6. Nature of Indirect Beneficial Ownership |
| 1. Title of Derivative Security | Date Exercisable | Expiration Date | Title | Amount or Number of Shares | 4. Conversion or Exercise Price | 5. Ownership Form | 6. Nature of Indirect Beneficial Ownership |
| Option (right to buy) | 2025-09-30 | 2029-09-30 | Ordinary Shares | 2666667 | $0.060 | D |  |
| Option (right to buy) | <sup>(1)</sup> | 2029-09-30 | Ordinary Shares | 5333333 | $0.060 | D |  |
| Option (right to buy) | 2023-07-01 | 2027-06-30 | Ordinary Shares | 1403303 | $0.170 | I | Held through Kilinwata Investments Pty Ltd, of which Mr. Hopper is the sole Shareholder and Director |
| Option (right to buy) | 2024-07-01 | 2027-06-30 | Ordinary Shares | 1403303 | $0.170 | I | Held through Kilinwata Investments Pty Ltd, of which Mr. Hopper is the sole Shareholder and Director |
| Option (right to buy) | 2025-07-01 | 2027-06-30 | Ordinary Shares | 1403723 | $0.170 | I | Held through Kilinwata Investments Pty Ltd, of which Mr. Hopper is the sole Shareholder and Director |
| Option (right to buy) | 2026-07-01 | 2030-07-01 | Ordinary Shares | 6046729 | $0.025 | D |  |
| Option (right to buy) | 2027-07-01 | 2030-07-01 | Ordinary Shares | 6046729 | $0.025 | D |  |
| Option (right to buy) | 2028-07-01 | 2030-07-01 | Ordinary Shares | 6048542 | $0.025 | D |  |
| Option (right to buy) | 2024-09-13 | 2026-08-24 | Ordinary Shares | 27500000 | $0.060 | D |  |
| Option (right to buy) | 2022-11-25 | 2026-11-30 | Ordinary Shares | 3571428 | $0.20 | I | Held through Kilinwata Investments Pty Ltd, of which Mr. Hopper is the sole Shareholder and Director |

---

### Footnotes:

(1) Granted on December 16, 2024. 2,666,667 options will vest on September 30, 2026 and 2,666,666 options will vest on September 30, 2027 provided that Mr. Hopper is still a Director on such dates.

**Remarks:**
1. All exercise prices are in Australian dollars.

**Signature:** /s/ Paul Hopper  
**Date:** 2026-05-06

### Remarks:

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.

* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).

** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).

Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.

**Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.**