Exhibit 99.1

Appendix 3H - Notification of cessation of securities

Announcement Summary

Entity name

ALTERITY THERAPEUTICS LIMITED

Announcement Type

New announcement

Date of this announcement

Wednesday January 07, 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

ATHAAD	OPTION EXPIRING 06-JAN-2026 EX $0.032	91,392,720	Expiry of option or other convertible security without exercise or conversion	06/01/2026

Refer to next page for full details of the announcement

Appendix 3H - Notification of cessation of securities

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Appendix 3H - Notification of cessation of securities

Part 1 - Announcement Details

	1.1 Name of +Entity
	ALTERITY THERAPEUTICS LIMITED

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

	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

	7/1/2026

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Appendix 3H - Notification of cessation of securities

Part 2 - Details of +equity securities or +debt securities that have ceased

	ASX +Security Code and Description
	ATHAAD : OPTION EXPIRING 06-JAN-2026 EX $0.032

	Unquoted +equity securities that have ceased
	Number of securities that have ceased
	91,392,720

	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?
	6/1/2026		No

Any other information the entity wishes to notify to ASX about the cessation?

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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)

	Total number of
ASX +security code and description	+securities on issue
ATH : ORDINARY FULLY PAID		10,875,416,329

ATHO : OPTION EXPIRING 31-AUG-2026		931,232,089

ATHOA : OPTION EXPIRING 26-FEB-2027		1,222,300,911

3.2 Unquoted +equity securities (total number of each +class of +equity securities issued but not quoted on ASX)

	Total number of
ASX +security code and description		+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

ATHAE : OPTION EXPIRING 08-AUG-2030 EX $0.013		11,500,000

ATHAF : OPTION EXPIRING 08-AUG-2030 EX USD 0.0086		312,400,200

ATHAD : OPTION EXPIRING 01-JUL-2030 EX $0.01		15,000,000

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		0

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

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