Holding(s) in Company

TR-1: NOTIFICATION OF MAJOR INTEREST IN SHARESi

1. Identity of the issuer or the underlying issuer of existing shares to which voting rights are attached: ii

Indivior PLC

2 Reason for the notification (please tick the appropriate box or boxes):

An acquisition or disposal of voting rights

An acquisition or disposal of qualifying financial instruments which may result in the acquisition of shares already issued to which voting rights are attached

An acquisition or disposal of instruments with similar economic effect to qualifying financial instruments

An event changing the breakdown of voting rights

Other (please specify):

Reckitt Benckiser Group ("RB Group") demerger of the Reckitt

Benckiser Pharmaceutical business; RB Group shareholders

received one ordinary share in Indivior PLC for each ordinary

share in RB Group held on 23 December 2014.

Yes

3. Full name of person(s) subject to the notification obligation: iii

Massachusetts Financial Services Company

4. Full name of shareholder(s) (if different from 3.):iv

MFS invests in securities of the issuer on behalf of its various mutual funds and institutional account clients.

5. Date of the transaction and date on which the threshold is crossed or reached: v

23 December 2014

6. Date on which issuer notified:

24 December 2014

7. Threshold(s) that is/are crossed or reached: vi, vii

5%

Class/type ofshares

if possible usingthe ISIN CODE

Situation previousto the triggeringtransaction

Resulting situation afterthe triggeringtransaction

NumberofShares

NumberofVotingRights

Numberof shares

Number ofvotingrights

% of votingrights x

Direct

Direct xi

Indirect xii

Direct

Indirect

GB00BRS65X63 

N/A

N/A

39,878,835

5.5497%

B: Qualifying Financial Instruments

Resulting situation after the triggering transaction

Type of financialinstrument

Expirationdate xiii

Exercise/Conversion Period xiv

Number of votingrights that may beacquired if theinstrument isexercised/ converted.

% of votingrights

C: Financial Instruments with similar economic effect to Qualifying Financial Instruments xv, xvi

Resulting situation after the triggering transaction

Type of financialinstrument

Exerciseprice

Expirationdate xvii

Exercise/Conversionperiod xviii

Number of votingrights instrumentrefers to

% of votingrights xix, xx

Nominal

Delta

Total (A+B+C)

Number of voting rights

Percentage of voting rights

39,878,835

5.5497%

9. Chain of controlled undertakings through which the voting rights and/or the financial instruments are effectively held, if applicable: xxi

Entity Holding Percentage Held

MFS Investment Management (LUX) S.A. (LUX) 1,743,939.00 0.2427%

MFS Investment Management Canada Ltd 1,368,913.00 0.1905%

MFS - Massachusetts Financial Services Company 18,000,835.00 2.5051%

MFS Heritage Trust Company 373,575.00 0.0521%

MFS Institutional Advisors, Inc. 8,773,415.00 1.2209%

MFS International Singapore Pte. Ltd. 206,290.00 0.0287%

MFS International (U.K.) Ltd. 6,448,819.00 0.8974%

MFS Investment Management K.K. 2,963,049.00 0.4123%

Notifiable Interest 39,878,835 5.5497%

Shares Outstanding 718,577,616

Proxy Voting:

10. Name of the proxy holder:

N/A

11. Number of voting rights proxy holder will cease to hold:

N/A

12. Date on which proxy holder will cease to hold voting rights:

N/A

13. Additional information:

14. Contact name:

15. Contact telephone number:

Note: Annex should only be submitted to the FSA not the issuer

Annex: Notification of major interests in share

Full name(including legal form of legal entities)

Contact address(registered office for legal entities)

Phone number & email

Other useful information(at least legal representative for legal persons)

Full name

Contact address

Phone number & email

Other useful information(e.g. functional relationship with the person or legal entity subject to the notification obligation)

C: Additional information