ORIGIN ENERGY LIMITED — Director's Dealing 2026

Mar 5, 2026

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ToCompany Announcements OfficeCompanyASX LimitedFromHelen Hardy	Facsimile1300 135 638
	Date6 March 2026
	Pages3
SubjectAppendix 3Y

Please find attached a release on the above subject.

Regards

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Authorised for lodgement by: Helen Hardy Company Secretary

02 8345 5000

Origin Energy Limited ABN 30 000 051 696 • Level 32, Tower 1, 100 Barangaroo Avenue, Barangaroo, NSW 2000 GPO Box 5376, Sydney NSW 2001 • Telephone (02) 8345 5000 • Facsimile (02) 9252 9244• www.originenergy.com.au

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	ORIGIN ENERGY LIMITED
ABN	30 000 051 696

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	Stephen Mikkelsen
Date of last notice	18 August 2025

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 relevantinterest.	Fully paid ordinary shares in the name ofInvia Custodian Pty Limited <SmikkelsFamily A/C>
Date of change	5 March 2026
No. of securities held prior to change	Nil
Class	Fully paid ordinary shares
Number acquired	10,000
Number disposed	Nil
Value/ConsiderationNote: If consideration is non-cash, provide details and estimatedvaluation	Average price of $11.8495 per share
No. of securities held after change	10,000 Fully paid ordinary shares heldindirectly

• See chapter 19 for defined terms.

01/01/2011

Appendix 3Y Page 1

Appendix 3Y Change of Director’s Interest Notice

Nature of change Example: on-market trade, off-market trade, exercise of options, issue of securities under dividend reinvestment plan, participation in buyback

On market trade

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	N/A
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 whichinterest related prior to changeNote: Details are only required for a contract inrelation to which the interest has changed	N/A
Interest acquired	N/A
Interest disposed	N/A
Value/ConsiderationNote: If consideration is non-cash, provide details andan estimated valuation	N/A
Interest after change	N/A

Part 3 –[+] Closed period

art 3 –+Closed period
Were the interests in the securities or contracts detailedabove traded during a+closed period where prior writtenclearance was required?	N/A
If so, was prior written clearance provided to allow thetrade to proceed during this period?	N/A
If prior written clearance was provided, on what date wasthis provided?	N/A

• See chapter 19 for defined terms.

Appendix 3Y Page 2

01/01/2011