FORM 3

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940

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

Table I - Non-Derivative Securities Beneficially Owned
1. Title of Security (Instr. 4)	2. Amount of Securities Beneficially Owned (Instr. 4)	3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	4. Nature of Indirect Beneficial Ownership (Instr. 5)
Ordinary Shares	53,900,000	D
Ordinary Shares	250,000	I	Held by Deborah Coleman, who is Mr. Hopper's spouse.
Ordinary Shares	93,571,428	I	Held through Kilinwata Investments Pty Ltd, of which Mr. Hopper is the sole Shareholder and Director

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 4)	2. Date Exercisable and Expiration Date (Month/Day/Year)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Option (right to buy)	09/30/2025	09/30/2029	Ordinary Shares	2,666,667	0.06	D
Option (right to buy)	(1)	09/30/2029	Ordinary Shares	5,333,333	0.06	D
Option (right to buy)	07/01/2023	06/30/2027	Ordinary Shares	1,403,303	0.17	I	Held through Kilinwata Investments Pty Ltd, of which Mr. Hopper is the sole Shareholder and Director
Option (right to buy)	07/01/2024	06/30/2027	Ordinary Shares	1,403,303	0.17	I	Held through Kilinwata Investments Pty Ltd, of which Mr. Hopper is the sole Shareholder and Director
Option (right to buy)	07/01/2025	06/30/2027	Ordinary Shares	1,403,723	0.17	I	Held through Kilinwata Investments Pty Ltd, of which Mr. Hopper is the sole Shareholder and Director
Option (right to buy)	07/01/2026	07/01/2030	Ordinary Shares	6,046,729	0.025	D
Option (right to buy)	07/01/2027	07/01/2030	Ordinary Shares	6,046,729	0.025	D
Option (right to buy)	07/01/2028	07/01/2030	Ordinary Shares	6,048,542	0.025	D
Option (right to buy)	09/13/2024	08/24/2026	Ordinary Shares	27,500,000	0.06	D
Option (right to buy)	11/25/2022	11/30/2026	Ordinary Shares	3,571,428	0.2	I	Held through Kilinwata Investments Pty Ltd, of which Mr. Hopper is the sole Shareholder and Director

Explanation of Responses:

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.

	/s/ Paul Hopper	05/06/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
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