Notification of Major Interest In Shares

TR-1: NOTIFICATION OF MAJOR INTEREST IN SHARESi

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

Ibstock 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: iii

Diamond (BC) S.à r.l

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

5. Date of the transaction and date onwhich the threshold is crossed orreached: v

4 November 2015

6. Date on which issuer notified:

5 November 2015

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

Below 53%, below 52%, below 51%, below 50%, below 49% and below 48%

8. Notified details:

A: Voting rights attached to shares viii, ix

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 x

Direct

Direct xi

Indirect xii

Direct

Indirect

Ordinary

215,030,435

215,030,435

190,700,435

190,700,435

47.03%

ISIN GB00BYXJC278

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

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

190,700,435

47.03%

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

Diamond (BC) S.à r.l is an indirect subsidiary of investment funds advised by Bain Capital Europe, LLP and its affiliates.

Proxy Voting:

10. Name of the proxy holder:

Not applicable

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

Not applicable

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

Not applicable

13. Additional information:

Sale of shares pursuant to the exercise of the over-allotment option

14. Contact name:

Bart Gombert

European General Counsel

Bain Capital Europe, LLP

15. Contact telephone number:

020 7514 5279