ATHE 6-K

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 September 2026

Alterity Therapeutics Limited

(Name of Registrant)

Level 15, 500 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:

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.

Date: September 3, 2026

2

ex_1012294.htm

Exhibit 99.1

Alterity Therapeutics to Participate in a Fireside Chat at the

Cantor Global Healthcare Conference 2026

MELBOURNE, AUSTRALIA AND SAN FRANCISCO, USA – 3 September 2026: Alterity Therapeutics (ASX: ATH, NASDAQ: ATHE) (“Alterity” or “the Company”), a biotechnology company dedicated to developing disease modifying treatments for neurodegenerative diseases, today announced that David Stamler, M.D., Chief Executive Officer, will participate in a Fireside Chat at the Cantor Global Healthcare Conference 2026 on Friday, September 11, 2026 at 10:20 a.m. ET in the United States.

A link to the live and archived webcast may be accessed on Alterity Therapeutics website under the Investors section: Events and Presentations.

About Alterity Therapeutics Limited

Alterity Therapeutics is a clinical stage biotechnology company dedicated to creating an alternate future for people living with neurodegenerative diseases. The Company is focused on developing disease modifying therapies in Multiple System Atrophy (MSA) and related Parkinsonian disorders. Alterity is preparing to initiate a Phase 3 pivotal trial in MSA, a rare and rapidly progressive disease. ATH434, the Company’s lead asset, has demonstrated clinically meaningful efficacy in a randomized, double-blind, placebo-controlled Phase 2 clinical trial in participants with MSA. Alterity has further reported positive data in its open label Phase 2 clinical trial in participants with advanced MSA. In addition, Alterity has a broad drug discovery platform generating patentable chemical compounds to treat the underlying pathology of neurological diseases. The Company is based in Melbourne, Australia, and San Francisco, California, USA. For further information please visit the Company’s website at https://alteritytx.com.

Authorization & Additional Information

This announcement was authorized by David Stamler, CEO of Alterity Therapeutics Limited.

Contacts:

Investors

Elyse Shapiro

[email protected]

Remy Bernarda

Investor Relations Advisory Solutions

[email protected]

+1 (415) 203-6386

Media

Melissa Tempra

NWR Communications

[email protected]

Casey McDonald

Tiberend Strategic Advisors, Inc.

[email protected]

+1 (646) 577-8520