Mondi plc (Incorporated in England and Wales) (Registered number: 6209386) LEI: 213800LOZA69QFDC9N34 LSE share code: MNDI ISIN: GB00B1CRLC47 JSE share code: MNP 20 June 2022 Notification of Major Interests in Shares 1. Issuer Details: ISIN: GB00B1CRLC47 Issuer Name: Mondi plc UK or Non-UK Issuer: UK 2. Reason for notification: An acquisition or disposal of voting rights 3. Details of person subject to the notification obligation: Name: Allan Gray Proprietary Limited City of registered office: Cape Town Country of registered office: South Africa 4. Details of the shareholder: Full name of shareholder(s) if different from the persons(s) subject to the notification obligation, above: N/A City of registered office: N/A Country of registered office: N/A 5. Date on which the threshold was crossed or reached: 17 June 2022 6. Date on which Issuer notified: 20 June 2022 7. Total positions of person(s) subject to the notification obligation: % of voting rights % of voting rights Total of both in % Total number of attached to shares through financial (8.A + 8.B) voting rights held (total of 8. A) instruments (total in issuer of 8.B 1 + 8.B 2) Resulting situation on the date on 3.022000 0.000000 3.022000 14,672,188 which threshold was crossed or reached Position of previous notification (if N/A N/A N/A N/A applicable) 8. Notified details of the resulting situation on the date which the threshold was crossed or reached: A: Voting rights attached to shares Class/type of No. of voting rights % of voting rights shares ISIN code (if Direct Indirect Direct Indirect possible) (DTR5.1) (DTR5.2.1) (DTR5.1) (DTR5.2.1) GB00B1CRLC47 14,672,188 N/A 3.022000 N/A Subtotal 8.A 14,672,188 3.022000 B1: Financial Instruments according to (DTR5.3.1.1 (a)) Type of Expiration Exercise/ Number of voting % of voting financial date Conversion rights that may be rights instrument Period acquired if the instrument is exercised/ converted. N/A N/A N/A N/A N/A Subtotal 8.B 1 B2: Financial Instruments with similar economic effect according to (DTR5.3.1R.(1) (b)) Type of Expiration Exercise/ Physical or Number of % of voting financial date Conversion cash voting rights rights instrument Period settlement N/A N/A N/A N/A N/A N/A Subtotal 8.B 2 9. Information in relation to the person subject to the notification obligation: 1. Person subject to the notification obligation is not controlled by any natural person or legal entity and does not control any other undertaking(s) holding directly or indirectly an interest in the (underlying) issuer. % of voting % of voting rights rights if it through financial Total of both if it Ultimate Name of equals or is instruments if it equals or is higher controlling controlled higher than equals or is higher than the notifiable person undertaking the notifiable than the notifiable threshold threshold threshold 10. In case of proxy voting: Name of the proxy holder: N/A The number and % of voting rights held: N/A The date until which the voting rights will be held: N/A 11. Additional information: The ordinary shares acquired are held by Allan Gray's clients, as opposed to by Allan Gray itself. 12. Date of completion: 20 June 2022 13. Place of completion: Cape Town, South Africa Sponsor in South Africa: Merrill Lynch South Africa (Pty) Ltd t/s BofA Securities