Theranostics options lapse without exercise

Theranostics Limited reported that 505,598 unquoted RADAN options expired on 31 May 2026 without being exercised or converted, meaning these potential shares will no longer be issued.

Rhea-AI Filing Summary

Theranostics Limited reported that 505,598 unquoted RADAN options expired on 31 May 2026 without being exercised or converted, meaning these potential shares will no longer be issued. No consideration was paid in connection with the cessation.

After this change, the company reports 3,544,216,160 RAD ordinary fully paid shares on issue, alongside multiple series of outstanding options, including 421,025,268 RADAN options and several other option classes with varying expiry dates and exercise prices.

Key Figures

RADAN options ceased: 505,598 options Ordinary shares on issue: 3,544,216,160 shares RADAN options remaining: 421,025,268 options +3 more

6 metrics

RADAN options ceased 505,598 options Expired 31/05/2026 without exercise or conversion

Ordinary shares on issue 3,544,216,160 shares RAD ordinary fully paid shares on issue after cessation

RADAN options remaining 421,025,268 options RADAN options on issue following reported cessation

RADO options on issue 79,352,040 options RADO options expiring 30-Nov-2026

RADOA options on issue 818,890,534 options RADOA options expiring 24-Aug-2026

RADOB options on issue 1,179,266,658 options RADOB options expiring 31-Oct-2027

Key Terms

foreign private issuer, Form 6-K, expiry of option or other convertible security without exercise or conversion, issued capital, +1 more

5 terms

foreign private issuer regulatory

"Form 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16"

A foreign private issuer is a company organized outside the United States that meets tests showing it is primarily foreign-controlled and therefore qualifies for a different set of U.S. reporting rules. For investors, that means the company files less frequent or differently formatted disclosures with U.S. regulators and may follow home-country accounting and governance practices, so buying its stock is like dining at a well-reviewed restaurant that follows its home kitchen’s rules instead of the local menu — you get access but should check what standards apply.

Form 6-K regulatory

"A copy of the Public Notice is attached as an exhibit to this report on Form 6-K."

A Form 6-K is a report that companies listed in certain countries file to provide important updates, such as financial results, corporate changes, or other significant information, to regulators and investors. It functions like an official company update or news release, helping investors stay informed about developments that could affect their investment decisions.

expiry of option or other convertible security without exercise or conversion financial

"Expiry of option or other convertible security without exercise or conversion"

issued capital financial

"We (the entity named above) provide the following information about our issued capital."

+securities financial

"Details of +securities that have ceased"

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What did Theranostics Limited (RADX) disclose in its June 2026 Form 6-K?

Theranostics Limited disclosed that 505,598 RADAN options expired on 31 May 2026 without exercise or conversion. This removes those potential shares from future issuance and slightly reduces the company’s outstanding option overhang.

How many Theranostics Limited RADAN options ceased in May 2026?

Theranostics Limited reported that 505,598 RADAN options ceased on 31 May 2026 due to expiry without exercise or conversion. These were unquoted equity securities and no consideration was paid for their cessation.

Did Theranostics Limited pay any consideration for the cessation of RADAN options?

No, Theranostics Limited confirmed it did not pay any consideration when 505,598 RADAN options ceased on 31 May 2026. The options simply expired unexercised, removing those rights to acquire shares.

What is Theranostics Limited’s ordinary share capital after the RADAN option expiry?

Following the reported option cessation, Theranostics Limited states it has 3,544,216,160 RAD ordinary fully paid shares on issue. This figure is used by ASX to help calculate the company’s market capitalisation from time to time.

How many RADAN options remain on issue for Theranostics Limited after the expiry?

After the expiry of some RADAN options, Theranostics Limited reports 421,025,268 RADAN options still on issue. These options have various expiry dates and exercise prices, separate from other option classes listed.

What other Theranostics Limited option classes are currently on issue?

Theranostics Limited lists several option classes on issue, including RADO, RADOA, RADOB, RADAK, RADAJ, RADAF, RADAG, RADAI and RADAP. Each class has its own total number of securities, expiry dates and, for some, specified exercise prices.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Accepted by SEC EDGAR 06/03/2026 - 08:00 AM Learn about SEC filing dates

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 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 +security code		Security description		Number of +securities that have ceased		The +securities have ceased 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 subject of 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 (total number of each +class of +securities quoted on ASX)

ASX +security code and description		Total number of +securities 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 +class of +equity securities issued but not quoted on ASX)

ASX +security code and description		Total number of +securities 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

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

Filing Exhibits & Attachments

1 document

Press Releases

• EX-99.1 NOTIFICATION OF CESSATION OF SECURITIES - RAD 30.1 KB