MAYNE PHARMA GROUP LIMITED — Major Shareholding Notification 2023

Jul 25, 2023

Corporations Law

Section 671B

Form 604

Notice of change of interests of substantial holder

To Company Name/Scheme Mayne Pharma Group Limited (MYX)

ACN/ARSN 115 832 963

1. Details of substantial holder (1)

Name Viburnum Funds Pty Ltd (“Viburnum”) and each of the parties listed in Annexure A

ABN (if applicable) 126 348 990

There was a change in the interests of the substantial holder on 24/07/2023

The previous notice was given to the company on 31/05/2023 The previous notice was dated 31/05/2023

1. Previous and present voting power

The total number of votes attached to all the voting shares in the company or voting interests in the scheme that the substantial holder or an associate (2) had a relevant interest (3) in when last required, and when now required, to give a substantial holding notice to the company or scheme, are as follows:

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----- Start of picture text ----- Class of securities (4) Previous notice Present noticePerson's votes Voting power (5) Person's votes Voting power (5)FPO 5,236,799 6.16% 6,360,592 7.48%----- End of picture text -----

3. Changes in relevant interests

Particulars of each change in, or change in the nature of, a relevant interest of the substantial holder or an associate in voting securities of the company or scheme, since the substantial holder was last required to give a substantial holding notice to the company or scheme are as follows:

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----- Start of picture text ----- Date of change Person whose Nature of change Consideration given in Class and number Person's votesrelevant interest (6) relation to change (7) of securities affectedchanged affected08 / 06 / 2023 – Viburnum Purchase of $4,900,566 1,123,793 FPO 1,123,79324 / 07 / 2023 shares on market----- End of picture text -----

4. Present relevant interests

Particulars of each relevant interest of the substantial holder in voting securities after the change are as follows:

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----- Start of picture text ----- Holder of Registered holder Person entitled to be Nature of relevant interest Class and Person'srelevant interest of securities registered as holder (6) number of votes(8) securitiesViburnum JP Morgan Viburnum Power to (or to control) 6,360,592 6,360,592Nominees exercise vote and/or FPOAustralia Ltd; or dispose of the securitiesas discretionaryBank of New York investment managers orMellon advisers ofsuperannuation funds,pooled superannuationtrusts, managedinvestment schemes andinvestment managementagreements.Viburnum As above As above Relevant interest underAssociates section 608(3)(a) and/orreferred to in 608(3)(b) of theAnnexure A Corporations Act 2001 (Cth).----- End of picture text -----

5. Changes in association

The persons who have become associates (2) of, ceased to be associates of, or have changed the nature of their association (9) with, the substantial holder in relation to voting interests in the company or scheme are as follows:

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----- Start of picture text ----- Name and ACN/ARSN (if applicable) Nature of associationN/A6. AddressesThe addresses of persons named in this form are as follows:Name AddressViburnum 31 Carrington Street, Nedlands, WA, 6009SignaturePrint Name David St Quintin Capacity Company SecretarySign Here Date 26 / 07 / 2023----- End of picture text -----

Annexure A to form 604

This is Annexure A of 1 page referred to in ASIC form 604 (Notice of change of interests of substantial holder), for Mayne Pharma Group Limited.

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David St Quintin Company Secretary 26 July 2023

Viburnum Funds Pty Ltd Subsidiaries (“Viburnum Subsidiaries”):

Viburnum Management Pty Ltd (ACN 126 937 424) Viburnum Holdings (Singapore) Pte. Ltd. V3 Trustees Pte. Ltd. V3 Management Pte. Ltd. Viburnum Management Pte. Ltd

Viburnum Funds Pty Ltd Associates (“Viburnum Associates”):

Gilbeyallen Investments Pty Ltd (ACN 164 108 258) Justin Court Holdings Pty Ltd (ACN 668 961 902)