Indivior : 2023 Form of Proxy

Please detach this portion before posting this proxy form.

Attendance Card

Please bring this card with you to the Meeting and present it at Shareholder registration/accreditation.

The Chair of Indivior PLC invites you to attend the Annual General Meeting of the Company to be held at The Marlborough Theatre, No. 11 Cavendish Square, London W1G 0AN on 4 May 2023 at 11.00 am.

Shareholder Reference Number

Register atwww.investorcentre.co.uk - elect for electronic communications & manage your shareholding online!

To be effective, all proxy appointments must be lodged with the Company's Registrars at:

Computershare Investor Services PLC, The Pavilions, Bridgwater Road, Bristol BS99 6ZY by 2 May 2023 at 11.00 am.

Explanatory Notes:

• 1. Every holder has the right to appoint some other person(s) of their choice, who need not be a shareholder, as their proxy to exercise all or any of their rights, to attend, speak and vote on their behalf at the meeting. If you wish to appoint a person other than the Chair, please insert the name of your chosen proxy holder in the space provided (see reverse). If the proxy is being appointed in relation to less than your full voting entitlement, please enter in the box next to the proxy holder's name (see reverse) the number of shares in relation to which they are authorised to act as your proxy. If returned without an indication as to how the proxy shall vote on any particular matter, the proxy will exercise their discretion as to whether, and if so how, they vote (or if this proxy form has been issued in respect of a designated account for a shareholder, the proxy will exercise their discretion as to whether, and if so how, they vote).

• 2. To appoint more than one proxy, an additional proxy form(s) may be obtained by contacting the Registrar's helpline on 0370 707 1820 or you may photocopy this form. Please indicate in the box next to the proxy holder's name (see reverse) the number of shares in relation to which they are authorised to act as your proxy. Please also indicate by marking the box provided if the proxy instruction is one of multiple instructions being given. All forms must be signed and should be returned together in the same envelope.

• 3. The 'Vote Withheld' option overleaf is provided to enable you to abstain on any particular resolution. However, it should be noted that a 'Vote Withheld' is not a vote in law and will not be counted in the calculation of the proportion of the votes 'For' and 'Against' a resolution.

• 4. Pursuant to Regulation 41 of the Uncertificated Securities Regulations 2001, entitlement to attend and vote at the meeting and the number of votes which may be cast thereat will be determined by reference to the Register of Members of the Company at close of business on the day which is two days before the day of the meeting. Changes to entries on the Register of Members after that time shall be disregarded in determining the rights of any person to attend and vote at the meeting.

• 5. To appoint one or more proxies or to give an instruction to a proxy (whether previously appointed or otherwise) via a designated voting platform, any such messages must be received by the issuer's agent prior to the specified deadline within the relevant system. For this purpose, the time of receipt will be taken to be the time (as determined by the timestamp generated by the relevant designated voting platform) from which the issuer's agent is able to retrieve the message. The Company may treat as invalid a proxy appointment sent via a designated voting platform in the circumstances set out

• in Regulation 35(5)(a) of the Uncertificated Securities Regulations 2001.

• 6. The above is how your address appears on the Register of Members. If this information is incorrect please ring the Registrar's helpline on 0370 707 1820 to request a change of address form or go towww.investorcentre.co.ukto use the online Investor Centre service.

• 7. Any alterations made to this form should be initialled.

• 8. The completion and return of this form will not preclude a member from attending the meeting and voting in person.

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Form of Proxy

Please complete this box only if you wish to appoint a third party proxy other than the Chair. Please leave this box blank if you want to select the Chair. Do not insert your own name(s).

I/We hereby appoint the Chair of the Meeting OR the person indicated in the box above as my/our proxy to attend, speak and vote in respect of my/our full voting entitlement* on my/our behalf at the Annual General Meeting of Indivior PLC to be held at The Marlborough Theatre, No. 11 Cavendish Square, London W1G 0AN on 4 May 2023 at 11.00 am, and at any adjourned meeting.

* For the appointment of more than one proxy, please refer to Explanatory Note 2 (see front).

Please mark here to indicate that this proxy appointment is one of multiple appointments being made.

Ordinary Resolutions

• 1. To receive the Company's audited accounts and the reports of the

• Directors and the Auditor for the year ended December 31, 2022.

• 2. To approve the Directors' Remuneration Report (other than the part containing the Directors' Remuneration Policy which was approved at the 2021 AGM) for the year ended December 31, 2022.

• 3. To elect Barbara Ryan as a Director.

• 4. To re-elect Peter Bains as a Director.

• 5. To re-elect Mark Crossley as a Director.

• 6. To re-elect Graham Hetherington as a Director.

• 7. To re-elect Jerome Lande as a Director.

• 8. To re-elect Joanna Le Couilliard as a Director.

• 9. To re-elect Dr A. Thomas McLellan as a Director.

• 10. To re-elect Lorna Parker as a Director.

• 11. To re-elect Daniel J. Phelan as a Director.

• 12. To re-elect Ryan Preblick as a Director.

VoteFor

Against Withheld

Please use a black pen. Mark with an X inside the box as shown in this example.

• 13. To re-elect Mark Stejbach as a Director.

• 14. To re-elect Juliet Thompson as a Director.

• 15. To re-appoint PricewaterhouseCoopers LLP as Auditor of the Company to hold office until the conclusion of the next general meeting of the Company at which the accounts are laid before the Company.

• 16. To authorize the Audit Committee of the Board to determine the remuneration of the Auditor.

• 17. To authorize the Company and any of its UK subsidiaries to make political donations and incur political expenditure.

• 18. That the Directors be generally authorized to allot shares in the Company.

Special Resolutions

• 19. That the Directors be authorized to disapply pre-emption rights up to 10% of the issued capital.

• 20. That the Directors be authorized to disapply pre-emption rights up to an additional 10% for transactions which the Board determines to be an acquisition or capital investment.

• 21. That the Company be generally and unconditionally authorized to make market purchases of its own ordinary shares.

  X

  VoteFor

  Against Withheld

• 22. That a general meeting of the Company other than an annual general meeting may be called on not less than 14 clear days' notice.

• 23. That the articles of association produced to the meeting (and for the purposes of identification signed by the Chair of the meeting) be adopted as the articles of association of the Company.

I/We instruct my/our proxy as indicated on this form. Unless otherwise instructed the proxy may vote as he or she sees fit or abstain in relation to any business of the meeting.

Signature

Date

In the case of a corporation, this proxy must be given under its common seal or be signed on its behalf by an attorney or officer duly authorised, stating their capacity (e.g. director, secretary).

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