TTR-1: NOTIFICATION OF MAJOR INTEREST IN SHARES

TR-1: NOTIFICATION OF MAJOR INTEREST IN SHARES

1. Identity of the issuer or the underlying issuerof existing shares to which voting rights areattached:

WPP plc

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

An acquisition or disposal of voting rights

Yes

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):

3. Full name of person(s) subject to thenotification obligation:

Massachusetts Financial Services Company

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

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 onwhich the threshold is crossed orreached:

9 May 2014

6. Date on which issuer notified:

12 May 2014

7. Threshold(s) that is/are crossed orreached:

5%

8. Notified details:

A: Voting rights attached to shares

Class/type ofshares

if possible usingthe ISIN CODE

Situation previousto the triggeringtransaction

Resulting situation after the triggering transaction

NumberofShares

NumberofVotingRights

Numberof shares

Number of votingrights

% of voting rights

Direct

Direct

Indirect

Direct

Indirect

JE00B8KF9B49

66,068,194

66,068,194

67,134,987

5.04%

B: Qualifying Financial Instruments

Resulting situation after the triggering transaction

Type of financialinstrument

Expirationdate

Exercise/Conversion Period

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

% of votingrights

C: Financial Instruments with similar economic effect to Qualifying Financial Instruments

Resulting situation after the triggering transaction

Type of financialinstrument

Exercise price

Expiration date

Exercise/Conversion period

Number of voting rights instrument refers to

% of voting rights

Nominal

Delta

Total (A+B+C)

Number of voting rights

Percentage of voting rights

67,134,987

5.04%

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

Entity Voting Rights %of TSO

MFS Investment Management (LUX) S.A. 3,262,860 0.25%

MFS Investment Management Canada Ltd 5,118,308 0.38%

Massachusetts Financial Services Company 25,453,046 1.91%

MFS Heritage Trust Company 1,160,648 0.09%

MFS Institutional Advisors, Inc. 13,122,487 0.98%

MFS International Ltd. 693,395 0.05%

MFS International (U.K.) Ltd. 11,968,077 0.90%

MFS Investment Management K.K. 6,356,166 0.48%

Total 67,134,987 5.04%

Proxy Voting:

10. Name of the proxy holder:

N/A

11. Number of voting rights proxy holder will ceaseto hold:

N/A

12. Date on which proxy holder will cease to holdvoting 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 shares

A: Identity of the persons or legal entity subject to the notification obligation

Full name

(Including legal form of legal entities)

Massachusetts Financial Services Co.

Contact address

(registered office for legal entities)

111 Huntington Avenue

Boston, MA 02199

USA

Phone number & email

617-954-5814

Other useful information

(at least legal representative for legal persons)

Robert Flaherty

B: Identity of the notifier, if applicable

Full name

WPP plc

Contact address

27 Farm Street, London, WIJ 5RJ

Phone number & email

Marie Capes, [email protected]

Other useful information

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

0207-408-2204

C: Additional Information