TR-1: NOTIFICATION OF MAJOR INTEREST IN SHARES 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

1pm plc

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

An acquisition or disposal of voting rights

X

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 the notification obligation: iii

Henderson Global Investors

4. Full name of shareholder(s)

(if different from 3.):iv

5. Date of the transaction and date on

which the threshold is crossed or reached: v

26 August 2015

6. Date on which issuer notified:

27 August 2015

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

Above 16%, 17% & 18%

8. Notified details:

A: Voting rights attached to shares viii, ix

Class/type of

shares

if possible using the ISIN CODE

Situation previous

to the triggering transaction

Resulting situation after the triggering transaction

Class/type of

shares

if possible using the ISIN CODE

Number

of

Shares

Number

of Voting Rights

Number

of shares

Number of voting

rights

% of voting rights x

Class/type of

shares

if possible using the ISIN CODE

Number

of

Shares

Number

of Voting Rights

Direct

Direct xi

Indirect xii

Direct

Indirect

Ordinary

GB00BCDBXK43

5,890,212

5,890,212

9,623,370

18.31%

B: Qualifying Financial Instruments

Resulting situation after the triggering transaction

Type of financial

instrument

Expiration date xiii

Exercise/

Conversion Period xiv

Number of voting

rights that may be acquired if the instrument is exercised/ converted.

% of voting

rights

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

xv, xvi

Resulting situation after the triggering transaction

Type of financial

instrument

Exercise

price

Expiration date xvii

Exercise/

Conversion period xviii

Number of voting rights

instrument refers to

% of voting rights xix,

xx

Nominal

Delta

Total (A+B+C)

Number of voting rights

Percentage of voting rights

9,623,370

18.31%


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

Proxy Voting:

10. Name of the proxy holder:

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

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

13. Additional information:

This disclosure has been calculated based on total voting rights amount of 52,534,463.

14. Contact name:

Scott Dickenson

15. Contact telephone number:

020 7818 4184

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