BIOTRON LIMITED — Director's Dealing 2012

Sep 9, 2012

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Level 2, 66 Hunter Street Sydney NSW 2000 Tel: (61-2) 9300 3344 Fax: (61-2) 9221 6333 E-mail: pnightingale@biotron.com.au Website: www.biotron.com.au

10 September 2012

The Manager Companies ASX Limited 20 Bridge Street SYDNEY NSW 2000

(3 pages by email)

Dear Madam,

DIRECTOR'S INTERESTS

Pursuant to Listing Rule 3.19A, I attach an Appendix 3Y, Change of Director's Interest Notice, for Robert B. Thomas.

Yours sincerely

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Peter J. Nightingale Company Secretary

pjn6870

Appendix 3Y Change of Director’s Interest Notice

Rule 3.19A.2

Appendix 3Y

Change of Director’s Interest Notice

Information or documents not available now must be given to ASX as soon as available. Information and documents given to ASX become ASX’s property and may be made public.

Introduced 30/09/01 Amended 01/01/11

Name of entity	BIOTRON LIMITED
ABN	60 086 399 144

We (the entity) give ASX the following information under listing rule 3.19A.2 and as agent for the director for the purposes of section 205G of the Corporations Act.

Name of Director	Robert B. THOMAS
Date of last notice	7 March 2012

Part 1 - Change of director’s relevant interests in securities

In the case of a trust, this includes interests in the trust made available by the responsible entity of the trust

Note: In the case of a company, interests which come within paragraph (i) of the definition of “notifiable interest of a director” should be disclosed in this part.

Direct or indirect interest	Indirect
Nature of indirect interest (including registered holder) Note: Provide details of the circumstances giving rise to the relevant interest.	Robert Thomas and Kyrenia Thomas Rob Thomas Super Fund A/C> in which Robert Bain Thomas has an interest and Robert Thomas A/C> inwhich RobThomashas an interest.
Date of change	4 - 7 September 2012
No. of securities held prior to change	5,000,000 fully paid ordinary shares held by Robert Thomas and Kyrenia Thomas Rob Thomas Super Fund A/C> 250,000 fully paid ordinary shares held by Robert Bain Thomas A/C>.
Class	Fully paid ordinary shares
Number acquired	316,716
Number disposed	Nil
Value/Consideration Note: If consideration is non-cash, provide details and estimated valuation	$28,324

• See chapter 19 for defined terms.

Appendix 3Y Page 1

01/01/2011

Appendix 3Y Change of Director’s Interest Notice

No. of securities held after change	5,316,716 fully paid ordinary shares held by Robert Thomas and Kyrenia Thomas Rob Thomas Super Fund A/C> 250,000 fully paid ordinary shares held by Robert Bain Thomas A/C>.
Nature of change Example: on-market trade, off-market trade, exercise of options, issue of securities under dividend reinvestment plan, participation in buy-back	On market purchase.

Part 2 – Change of director’s interests in contracts

Note: In the case of a company, interests which come within paragraph (ii) of the definition of “notifiable interest of a director” should be disclosed in this part.

Detail of contract	Nil
Nature of interest	N/A
Name of registered holder (if issued securities)	N/A
Date of change	N/A
No. and class of securities to which interest related prior to change Note: Details are only required for a contract in relation to which the interest has changed	N/A
Interest acquired	N/A
Interest disposed	N/A
Value/Consideration Note: If consideration is non-cash, provide details and an estimated valuation	N/A
Interest after change	N/A

Part 3 –[+] Closed period

Were the interests in the securities or contracts detailed above traded during a+closed period where prior written clearance was required?	No
If so, was prior written clearance provided to allow the trade toproceed during thisperiod?	N/A
If prior written clearance was provided, on what date was thisprovided?	N/A

• See chapter 19 for defined terms.

Appendix 3Y Page 2

01/01/2011