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 issuerof existing shares to which voting rights areattached: ii

Sirius Minerals 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

X

Other (please specify):

Holdings in ordinary shares increased above 10% after exercising warrants.

X

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

The Capital Group Companies, Inc.

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

See Schedule A

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

3 August 2015

6. Date on which issuer notified:

4 August 2015

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

Above 10%

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 Shares

(ISIN: GB00B0DG3H29)

208,692,970

208,692,970

225,492,970

10.1751%

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

Warrants

(ISIN: GB00BKJ9V379)

14 Sep 2015

33,200,000

1.4981%

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

258,692,970

11.6732%

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

See Schedule A

Proxy Voting:

10. Name of the proxy holder:

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

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

13. Additional information:

14. Contact name:

15. Contact telephone number:

As of 3 August 2015

Sirius Minerals plc

Number of Shares

Percent of Outstanding

The Capital Group Companies, Inc. ("CG") holdings

258,692,970

11.673%

Holdings by CG Management Companies and Funds:

Capital Research and Management Company

258,692,970

11.673%

SMALLCAP World Fund, Inc.