Rule 2.9 Announcement

NOT FOR RELEASE, PUBLICATION OR DISTRIBUTION IN WHOLE OR IN PART, IN, INTO OR FROM ANY JURISDICTION WHERE TO DO SO WOULD CONSTITUTE A VIOLATION OF THE RELEVANT LAWS OF SUCH JURISDICTION

13 January 2020

Sirius Minerals Plc ("Sirius")

Rule 2.9 Announcement

Further to the announcement released by Sirius on 9 January 2020 and in accordance with Rule 2.9 of the City Code on Takeovers and Mergers, Sirius confirms that as at the close of business on 10 January 2020 it had in issue 7,020,196,560 ordinary shares of 0.25 pence each and admitted to trading on the main market of the London Stock Exchange under the ISIN code GB00B0DG3H29. Sirius holds no ordinary shares in treasury.

Sirius also confirms that as at the close of business on 10 January 2020 it has USD 236,600,000 convertible bonds outstanding; these bonds are convertible into Sirius ordinary shares, and comprise two series 1) USD 137,600,000 8.5 per cent convertible bonds due 2023 (ISIN code: XS1515223516) and 2) USD 99,000,000 5 per cent convertible bonds due 2027 (ISIN code: XS1991118255).

Sirius also further confirms that as at the close of business on 10 January 2020, it had in issue 30,229 American depositary receipts (ADRs) for which Deutsche Bank Trust Company Americas acts as depository. These ADRs represent 1,511,450 ordinary shares. The ADRs are traded over-the-counter (OTC). The trading symbol for the ADR securities is SRUXY and the ISIN is US82967P1030.

Enquiries:

Sirius Minerals Plc Tel: +44 (0) 84 5524 0247

Gareth Edmunds

Tristan Pottas

J.P. Morgan Cazenove (Financial Adviser to Sirius) Tel: +44 (0) 20 7742 4000

Jamie Riddell

James Robinson

Andrey Zhvitiashvili

Jonty Edwards

Edelman

Alex Simmons Tel: +44 (0) 7970 174 353

Ed Brown Tel: +44 (0) 7540 412 298

Allen & Overy LLP is acting as legal adviser to Sirius.