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ATHE 6-K

Alterity Therapeutics Ltd (ATHE)

6-K 2025-08-15 For: 2025-08-15
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Added on July 04, 2026

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 6-K

REPORT OF FOREIGN PRIVATE ISSUER

PURSUANT TO RULE 13a-16 OR 15d-163

UNDER THE SECURITIES EXCHANGE ACT OF 1934

For the month of August 2025

Alterity Therapeutics Limited

(Name of Registrant)

Level 14, 350 Collins Street, Melbourne, Victoria 3000 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 ☐

This Form 6-K is being incorporated by reference into our Registration Statement on Form S-8 (Files No. 333-251073, 333-248980 and 333-228671) and our Registration Statements on Form F-3 (Files No. 333-274816, 333-251647, 333-231417 and 333-250076)

ALTERITY THERAPEUTICS LIMITED

(a development stage enterprise)

The following exhibits are submitted:

99.1 Notification regarding unquoted securities - ATH

1

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.

Alterity Therapeutics Limited
By: /s/ Geoffrey P. Kempler
Geoffrey P. Kempler
Chairman

Date: August 15, 2025

2

Exhibit 99.1

Appendix 3G - Notification of issue, conversion or payment up of unquoted equity securities

Announcement Summary

Entity name

ALTERITY THERAPEUTICS LIMITED

Date of this announcement

Friday August 15, 2025

The +securities the subject of this notification are:

+Other securities issued under an +employee incentive scheme that are not intended to be quoted on ASX

Total number of +securities to be issued/transferred

ASX<br>+security code Security<br>description Total<br>number of<br><br>+securities to be<br><br>issued/transferred Issue<br>date
New class - code<br><br>to be confirmed Unlisted options expiring 8 August 2030 ex 0.013 11,500,000 15/08/2025

All values are in US Dollars.

Refer to next page for full details of the announcement

Appendix 3G - Notification of issue, conversion or payment up of unquoted equity securities 1 / 6
Appendix 3G - Notification of issue, conversion or payment up of unquoted equity securities
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Part 1 - Entity and announcement details

1.1 Name of entity

ALTERITY THERAPEUTICS LIMITED

We (the entity named above) give notice of the issue, conversion or payment up of the following unquoted +securities.

1.2 Registered number type Registration number
ABN 37080699065

1.3 ASX issuer code

ATH

1.4 The announcement is

New announcement

1.5 Date of this announcement

15/8/2025

Appendix 3G - Notification of issue, conversion or payment up of unquoted equity securities 2 / 6
Appendix 3G - Notification of issue, conversion or payment up of unquoted equity securities
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Part 2 - Issue details

2.1 The +securities the subject of this notification are:

+Other securities issued under an +employee incentive scheme that are not intended to be quoted on ASX

2.2a This notification is given in relation to an issue of +securities in a class which is not quoted on ASX and which:

does not have an existing ASX security code (“new class”)

Appendix 3G - Notification of issue, conversion or payment up of unquoted equity securities 3 / 6
Appendix 3G - Notification of issue, conversion or payment up of unquoted equity securities
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Part 3C - number and type of +securities the subject of this notification (new class)

ASX +security code +Security description
New class - code to be confirmed Unlisted options expiring 8 August 2030 ex $0.013
+Security type ISIN<br>code
Options

Date the +securities the subject of this notification were issued

15/8/2025

Will all the +securities issued in this class rank equally in all respects from their issue date?

Yes

Were any of the +securities issued to +key management personnel (KMP) or an +associate?

No

Have you received confirmation from ASX that the terms of the +securities are appropriate and equitable under listing rule 6.1?

No

Please provide a URL link for a document lodged with ASX setting out the material terms of the +securities being issued.

Options Details

+Security currency Exercise price Expiry date
AUD - Australian Dollar AUD 0.01300000 8/8/2030

Details of the existing class of +security that will be issued upon exercise or conversion of this new class of company option

ATH : ORDINARY FULLY PAID

Please provide a URL link for a document lodged with ASX detailing the terms of the +employee incentive scheme or a summary of the terms

https://app.sharelinktechnologies.com/announcement/asx/786790b2c52e5b04b80c6d18bc2009d4

Any other information the entity wishes to provide about the +securities the subject of this notification

Issue details

Number of +securities

11,500,000

Appendix 3G - Notification of issue, conversion or payment up of unquoted equity securities 4 / 6
Appendix 3G - Notification of issue, conversion or payment up of unquoted equity securities
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Part 4 - +Securities on issue

Following the issue, conversion or payment up of the +securities the subject of this notification, the +securities of the entity will comprise:

The figures in parts 4.1 and 4.2 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.

4.1 Quoted +securities (Total number of each +class of +securities issued and quoted on ASX)

Total number of
ASX +security code and description +securities on issue
ATH : ORDINARY FULLY PAID 9,207,465,724
ATHO : OPTION EXPIRING 31-AUG-2026 932,516,031
ATHOA : OPTION EXPIRING 26-FEB-2027 1,222,300,911

4.2 Unquoted +securities (Total number of each +class of +securities issued but not quoted on ASX)

ASX +security code and description Total number of<br><br>+securities on issue
ATHAAE : OPTION EXPIRING 29-NOV-2026 EX $0.0375 10,000,000
ATHAAG : OPTION EXPIRING 29-NOV-2026 EX $0.0238 11,500,000
ATHAD : OPTION EXPIRING 01-JUL-2030 EX $0.01 15,000,000
ATHAAB : OPTION EXPIRING 17-SEP-2025 EX $0.09 35,000,000
ATHAAK : OPTION EXPIRING 30-DEC-2027 EX $0.01 170,000,000
ATHAAH : OPTION EXPIRING 19-DEC-2026 EX $0.0105 8,000,000
ATHAB : OPTION EXPIRING 13-MAR-2029 EX US$0.0031 62,500,000
ATHAA : OPTION EXPIRING 13-MAR-2029 EX $0.004 20,166,667
ATHAC : OPTION EXPIRING 21-MAR-2029 EX US$0.003 40,000,200
ATHAAD : OPTION EXPIRING 06-JAN-2026 EX $0.032 91,392,720
New class - code to be confirmed : Unlisted options expiring 8 August 2030 ex $0.013 11,500,000
Appendix 3G - Notification of issue, conversion or payment up of unquoted equity securities 5 / 6
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Appendix 3G - Notification of issue, conversion or payment up of unquoted equity securities
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Part 5 - Other Listing Rule requirements

5.1 Were the +securities issued under an exception in Listing Rule 7.2 and therefore the issue did not need any security holder approval under Listing Rule 7.1?

Yes

5.1 a Select the number of the applicable exception in Listing Rule 7.2

13

Appendix 3G - Notification of issue, conversion or payment up of unquoted equity securities 6 / 6