Indivior PLC

Proxy Solicitation & Information Statement • Sep 5, 2022

MR A SAMPLE < DESIGNATION> SAMPLE STREET SAMPLE TOWN SAMPLE CITY SAMPLE COUNTY AA11 1AA

Attendance Card

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

ADDITIONAL HOLDER 1 ADDITIONAL HOLDER 2 ADDITIONAL HOLDER 3

ADDITIONAL HOLDER 4

The Chair of Indivior PLC invites you to attend the General Meeting of the Company to be held at the offices of Freshfields Bruckhaus Deringer LLP, 100 Bishopsgate, London EC2P 2SR on 30 September 2022 at 11.00 am.

Shareholder Reference Number

C0000000000

Please detach this portion before posting this proxy form.

Form of Proxy - General Meeting to be held on 30 September 2022

Cast your Proxy online...It's fast, easy and secure! www.investorcentre.co.uk/eproxy

You will be asked to enter the Control Number, Shareholder Reference Number (SRN) and PIN shown opposite and agree to certain terms and conditions.

PIN: 1245 SRN: C0000000000 Control Number: 918039

View the Notice of Meeting online: www.indivior.com/en/investors/shareholder-information

Register at www.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 28 September 2022 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 his proxy to exercise all or any of his 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 his discretion as to whether, and if so how, he votes (or if this proxy form has been issued in respect of a designated account for a shareholder, the proxy will exercise his discretion as to whether, and if so how, he votes).
• 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. A corporation may appoint more than one corporate representative.
• 4. In the case of joint shareholders the signature of any shareholder will suffice, but the names of all joint holders should be shown. The vote of the senior holder who tenders the vote, in person or by proxy, shall be accepted to the exclusion of the votes of the other joint members. For this purpose seniority is determined by the order in which names stand on the register of members.
• 5. The proxy form must be signed by the shareholder or any person duly authorised by the shareholder or, if the shareholder is a corporation, be signed by a duly authorised person or under its common seal, or any other manner authorised by its constitution. If someone other than the shareholder signs the form, the letter of authority, power of attorney or certified copy of the power of attorney authorising him/her to sign on your behalf must be sent with this form.
• 6. The 'Vote Withheld' option overleaf is provided to enable you to abstain on any particular resolution. ReallyReallyReallyReallyLongWord reallyLongword andmore

Kindly Note: This form is issued only to the addressee(s) and is specific to the unique designated account printed hereon. This personalised form is not transferable between different: (i) account holders; or (ii) uniquely designated accounts. The Company and Computershare Investor Services PLC accept no liability for any instruction that does not comply with these conditions.

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.

• 7. 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.
• 8. 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.
• 9. 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 to www.investorcentre.co.uk to use the online Investor Centre service.
• 10. Any alterations made to this form should be initialled.
• 11. The completion and return of this form will not preclude a member from attending the meeting and voting in person.

MR A SAMPLE < Designation> Additional Holder 1 Additional Holder 2 Additional Holder 3 Additional Holder 4

*00000101010000*

Poll Card To be completed only at the Meeting if a Poll is called.

Special Resolution For Against

1. To adopt the new Articles of Association in connection with the additional US listing.

Ordinary Resolution

2. To approve the Consolidation of the Company's issued share capital in connection with the additional US listing pursuant to which every 5 ordinary shares will be consolidated into 1 ordinary share.

Signature

In the case of a corporation, a letter of representation will be required (in accordance with S323 of the Companies Act 2006) unless this has already been lodged at registration.

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).

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

C0000000000

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 General Meeting of Indivior PLC to be held at the offices of Freshfields Bruckhaus Deringer LLP, 100 Bishopsgate, London EC2P 2SR on 30 September 2022 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.

Special Resolution	For	Against	Vote Withheld
1. To adopt the new Articles of Association in connection with the additional US listing.

Ordinary Resolution

2. To approve the Consolidation of the Company's issued share capital in connection with the additional US listing pursuant to which every 5 ordinary shares will be consolidated into 1 ordinary share.

*

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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