MASTERMYNE GROUP LIMITED — Director's Dealing 2024

Dec 30, 2024

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 Mastermyne Group Limited ABN 96 142 490 579

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 Jeffrey Keith Whiteman

Date of last notice 5 February 2024 (Appendix 3X)

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.	Interest held by JK & VA Whiteman ATF TheWhiteman Family Trust, of which Mr Whitemanis a trustee and beneficiary of the trust.
Date of change	31 December 2024
No. of securities held prior to change	Ordinary Shares:640,650Performance Rights:2,939,893Options:4,114($0.23 ex price, expiry 31/5/28)
Class	Performance Rights
Number acquired	2,102,851
Number disposed	Nil
Value/ConsiderationNote: If consideration is non-cash, provide details and estimatedvaluation	$0.1964 per security (non cash value)

• See chapter 19 for defined terms.

01/01/2011

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Appendix 3Y Change of Director’s Interest Notice

No. of securities held after change	Ordinary Shares:640,650Performance Rights:5,042,744Options:4,114($0.23 ex price, expiry 31/5/28)
Nature of changeExample: on-market trade, off-market trade, exercise of options, issueof securities under dividend reinvestment plan, participation in buy-back	Issue of Performance Rights under theMastermyneGroupLimitedEmployeePerformance Rights Plan, as approved byshareholders at the 2024 Annual GeneralMeeting.

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	Not Applicable
Nature of interest
Name of registered holder(if issued securities)
Date of change
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
Interest acquired
Interest disposed
Value/ConsiderationNote: If consideration is non-cash, provide details andan estimated valuation
Interest after change

Part 3 –[+] Closed period

Were the interests in the securities or contracts detailed Not Applicable above traded during a[+] closed period where prior written clearance was required? If so, was prior written clearance provided to allow the trade to proceed during this period?

• See chapter 19 for defined terms.

Appendix 3Y Page 2

01/01/2011

Appendix 3Y Change of Director’s Interest Notice

If prior written clearance was provided, on what date was this provided?

• See chapter 19 for defined terms.

01/01/2011

Appendix 3Y Page 3