Director/PDMR Shareholding

26 June 2018

Sirius Minerals Plc

Director/PDMR Shareholding

On 26 June 2018, Sirius Minerals Plc ("Sirius" or the "Company") granted awards under its Share Based Incentive Plan (the "Plan") to its Executive Directors, other Persons Discharging Managerial Responsibilities ("PDMR") and other employees.

The awards have been granted as Jointly Owned Equity Awards ("JOE Awards") or as "Options". The JOE Awards consist of the acquisition by the Plan participant of an interest in the growth in value of shares which are owned jointly by the participant and the trustee of the Company's employee benefit trust ("EBT"), along with the right on the part of the participant to acquire the trustee's interest for nil-cost. The Options are rights to acquire shares for nil cost.

The Executive Directors' awards are the "Ordinary Awards" and "Exceptional Stretch Awards", in each case as referred to in the Directors' Remuneration Report on page 97 of the Company's 2017 Annual Report and Accounts, and are subject to the performance conditions set out there.

The vesting of all awards granted to the other Persons Discharging Managerial Responsibilities and other employees is subject to the satisfaction of performance condition milestones linked to the delivery of the Company's North Yorkshire polyhalite project. The following awards have been granted to other Persons Discharging Managerial Responsibilities.

A total of 9,393,263 new ordinary shares of £0.0025 each (the "Relevant Shares") have been awarded to the EBT as part of its employee incentive awards. An application has been made for the Relevant Shares to be admitted to the premium listing segment of the Official List of the Financial Conduct Authority (the "FCA") and to trading on the London Stock Exchange plc's main market for listed securities, and dealings are expected to commence at 8.00 am on 27 June 2018. The Relevant Shares will rank pari passu in all respects with all existing ordinary shares in the Company. In accordance with the requirements of the FCA's Disclosure Guidance and Transparency Rules 5.6.1AR and 5.6.2G, the Company confirms that the enlarged share capital of the Company following Admission on 27 June 2018 will be 4,699,404,050 Ordinary Shares in aggregate, each with equal voting rights. No shares are held in treasury.

In addition to the shares issued to the EBT, 1,060,000 ordinary shares have been awarded to Simon Carter, who is a Person Discharging Managerial Responsibility as part of his contractual arrangements following the achievement of certain milestones ("Milestone Award Shares"). Following this transaction, Simon Carter holds 1,060,000 shares in the Company, representing 0.02% of the Company's issued share capital. A further application has been made for the Milestone Award Shares to be admitted to the premium listing segment of the Official List of the Financial Conduct Authority (the "FCA") and to trading on the London Stock Exchange plc's main market for listed securities, and dealings are expected to commence at 8.00 am on 28 June 2018. The Milestone Award Shares will rank pari passu in all respects with all existing ordinary shares in the Company. In accordance with the requirements of the FCA's Disclosure Guidance and Transparency Rules 5.6.1AR and 5.6.2G, the Company confirms that the enlarged share capital of the Company following Admission on 28 June 2018 will be 4,700,464,050 Ordinary Shares in aggregate, each with equal voting rights. No shares are held in treasury.

The above figures may be used by shareholders (and others with notification obligations) as the denominator for the calculations by which they will determine if they are required to notify their interest in, or a change to their interest in, Sirius Minerals Plc under the FCA's Disclosure Guidance and Transparency Rules.

The Company can confirm that each of the Directors and PDMRs has complied with their respective obligations to notify the Financial Conduct Authority in respect of the above transactions as is their requirement under the EU Market Abuse Regulation.

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About Sirius Minerals Plc

Sirius Minerals Plc is focused on the development of the Woodsmith Mine, which will access the world's largest and highest grade polyhalite deposit located in North Yorkshire, United Kingdom. Polyhalite is a unique multi-nutrient fertilizer, which can be used to increase balanced fertilization around the world. Sirius Minerals' shares are traded on the Premium List of the London Stock Exchange. Its shares are also traded in the United States on the OTCQX through a sponsored ADR facility. Further information on the Company can be found at: www.siriusminerals.com.