Holding(s) in Company

For filings with the FCA include the annex

For filings with issuer exclude the annex

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

Ibstock 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 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

14 March 2017

6. Date on which issuer notified:

14 March 2017

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

Below 36%; below 35%; below 34%; below 33%; below 32%; below 31%; below 30%; below 29%; below 28%; below 27%; and below 26%

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

150,200,435

150,200,435

101,579,873

101,579,873

25.0%

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

101,579,873

25.0%

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 Private Equity (Europe), LLP and its affiliates.

Proxy Voting:

10. Name of the proxy holder:

Not applicable

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

Not applicable

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

Not applicable

13. Additional information:

Sale of shares pursuant to a placing

14. Contact name:

Bart Gombert

European General Counsel

Bain Capital Private Equity (Europe), LLP

15. Contact telephone number:

020 7514 5279

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

Annex: Notification of major interests in sharesxxii

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

Full name

(including legal form of legal entities)

Diamond (BC) S.à r.l

Contact address

(registered office for legal entities)

4 Lou Hemmer

1748 Findel

Luxembourg

Phone number & email

rspringham@baincapital.com

+352 2615 6636

Other useful information

(at least legal representative for legal persons)

Bart Gombert

European General Counsel

Bain Capital Private Equity (Europe), LLP

B: Identity of the notifier, if applicable

Full name

Bart Gombert

Contact address

Bain Capital Private Equity (Europe), LLP

Devonshire House

Mayfair Place

London W1J 8AJ

Phone number & email

020 7514 5279

bgombert@baincapital.com

Other useful information

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

Legal representative of Diamond (BC) S.à r.l

C: Additional information

For notes on how to complete form TR-1 please see the FCA website.