Proxy form (Proxy form 2026)

As a shareholder of Mayr-Melnhof Karton Aktiengesellschaft, I/we herewith authorise

(name of proxy in block letters)

to represent me/us at the 32ndOrdinary Shareholders' Meeting of Mayr-Melnhof Karton Aktiengesellschaft, Vienna, Commercial Register No. 81906 a, at the Wiener Börsensäle, Wipplingerstrasse 34, 1010 Vienna, starting at 10:00am on Wednesday, April 29th, 2026, and to exercise all rights to which I am entitled as a shareholder of Mayr-Melnhof Karton Aktiengesellschaft, in particular my right to vote.

In particular, I/we authorise the above-mentioned representative to exercise voting rights and to take decisions on the agenda below:

1. Presentation of the annual financial statements including the management report and the consolidated corporate governance report, the consolidated financial statements and the management report of the Group including the consolidated non-financial statement (sustainability statement), the proposed allocation of profit and the report of the Supervisory Board for the financial year 2025

2. Resolution on the allocation of the balance sheet profit

3. Resolution on the discharge of the members of the Management Board for the financial year 2025

4. Resolution on the discharge of the members of the Supervisory Board for the financial year 2025

5. Resolution on the remuneration of the members of the Supervisory Board for the financial year 2025

6. Appointment of the auditor and the Group auditor as well as the auditor of the consolidated sustainability reporting for the financial year 2026

7. Resolution on the remuneration report for the financial year 2025

8. Resolution on the remuneration policy

9. Resolution on the authorisation of the Management Board

   1. to acquire treasury shares in accordance with Section 65 (1)(8) as well as (1a) and (1b) AktG both via the stock exchange as well as off-market to the extent of up to 10 % of the share capital and excluding proportional selling rights that may be associated with such an acquisition (inverse exclusion of subscription rights),

   2. in accordance with Section 65 (1b) AktG, decide a method of disposal for the sale or use of treasury shares other than via the stock exchange or through a public offering, applying arrangements corresponding to those relating to the exclusion of subscription rights for shareholders,

   3. reduce the share capital through the cancelation of such treasury shares without further resolution of the Shareholders' Meeting

   4. Revocation of the authorisation granted by the resolution of the Sharehold-ers' Meeting of April 24th, 2024, under item 9 of the agenda to acquire treasury shares to the extent not yet utilised.

10. Resolution on the amendment to the Articles of Association in Section 22 (7)

I/We hereby instruct the proxy named above to vote as follows on agenda items 2 to 10 on the proposed resolutions of the Management Board and the Supervisory Board, as these are available for download on the Company's website at www.mm.group/ and www.mm.group/investors/shareholders-meeting/ in accordance with the convening notice (tick as appropriate):

(Please tick the box ankreuzen, do not use a red pen)

In the event of new or amended proposals put

the proposed resolutions

In the event of new or amended proposals from the Management Board or the Supervisory Board at the Shareholders' Meeting, I instruct the proxy to vote in accordance with the following instructions:

Voting rights are only exercised via instructions. If no instructions have been issued for a proposed resolution, the representative will abstain from voting.

If additional or amended instructions are issued after this form has been submitted, the instructions issued here remain valid unless they are amended or revoked.

The named proxy is authorised and empowered to issue sub-proxies.

The named proxy is authorised and empowered to carry out all actions and declarations with exemption from the prohibition of double representation.

Mayr-Melnhof Karton Aktiengesellschaft processes personal data on the basis of applicable data protection legislation and the Austrian Stock Corporation Act in order to enable shareholders to participate in and exercise their rights during the Shareholders' Meeting. The legal basis for such processing is article 6 (1) c) of the General Data Protection Regulation.

You can obtain additional information concerning data protection, in particular about your right to information, rectification, erasure, objection and restriction of processing from the invitation to this shareholders' meeting or you can contact the Company's Data Privacy Officer at privacy@mm.group.

(Name/company and address/registered office of the shareholder in block letters)

(Number of shares)

(Name of the bank where the securities account is held)

(Date, shareholder's personal signature or image of signature or corporate signature)

This English version is a translation of the German original text.