Sirius Minerals Regulatory News (SXX)

THIS ANNOUNCEMENT AND THE INFORMATION CONTAINED HEREIN IS RESTRICTED AND NOT FOR RELEASE, PUBLICATION OR DISTRIBUTION, IN WHOLE OR IN PART, DIRECTLY OR INDIRECTLY, IN OR INTO THE UNITED STATES, ANY EXCLUDED TERRITORY OR ANY OTHER JURISDICTION IN WHICH THE RELEASE, PUBLICATION OR DISTRIBUTION WOULD BE UNLAWFUL.

This announcement is for information purposes only and is not a prospectus and not an offer of securities for sale in any jurisdiction, including in the United States, Australia, Canada, Japan and South Africa.

This announcement should be read in its entirety. In particular, you should read and understand the information provided in the "Important Notice" section.

28 April 2017

Sirius Minerals Plc

Notification of admission to the Main Market

Further to the announcements previously made by Sirius Minerals Plc (the "Company") on 28 March 2017 and on 25 April 2017 the Company is pleased to confirm that, effective 8.00 am today, its entire ordinary share capital, being 4,164,514,405 ordinary shares, will be admitted to the premium listing segment of the Official List of the UK Listing Authority (the "Official List") and to trading on London Stock Exchange plc's main market ("Main Market") for listed securities (together, "Admission") and trading in the Company's shares on the AIM market of London Stock Exchange plc ("AIM") will be cancelled.

The Company is not raising any funds or issuing any new shares in connection with Admission. No shares have been offered or marketed to the public in the UK or elsewhere in connection with Admission or the publication of the related prospectus. The Company's shares will continue to be registered with their existing ISIN number GB00B0DG3H29 and SEDOL number B0DG3H2. The Company's TIDM code on the London Stock Exchange will continue to be SXX. The share capital of the Company following Admission is 4,164,514,405 shares in aggregate, each with equal voting rights. No shares are held in treasury.

Existing shareholders need take no further action to maintain their existing holdings as this change only affects the platform the ordinary shares are traded on.

Chris Fraser, Managing Director and Chief Executive Officer, said:

"This is another important milestone for the Company as we fulfil our commitment to move to the Main Market. The delivery of our Woodsmith Mine and associated infrastructure continues to proceed in a timely fashion and we look forward to providing further updates in due course."

For further information, please contact:

About Sirius Minerals Plc

Sirius Minerals Plc is the fertilizer development company focused on the construction and development of its North Yorkshire polyhalite project in the United Kingdom. It believes the Project represents the world's largest high-grade known deposit of polyhalite, a multi-nutrient form of potash containing potassium, sulphur, magnesium and calcium. Incorporated in 2003, Sirius Minerals Plc's shares are traded on the London Stock Exchange's Main Market. Further information on the Company can be found at: www.siriusminerals.com.

Important notice

This announcement is for information purposes only and does not constitute an offer or invitation to sell or issue or the solicitation of an offer to buy, acquire or subscribe for shares in the Company. This announcement does not constitute nor form part of an offer to sell securities or the solicitation of an offer to buy securities in the United States. The Ordinary Shares have not been and will not be registered under the Securities Act or under any securities laws or with any securities regulatory authority of any state or other jurisdiction of the United States. The Ordinary Shares may not be offered, sold, resold, taken up, transferred, delivered or distributed, directly or indirectly, into or within the United States absent registration under the Securities Act or an available exemption from, or in a transaction not subject to, the registration requirements of the Securities Act and in compliance with any applicable securities laws of any state or other jurisdiction of the United States. There is no public offer of the Ordinary Shares in the United States. The Ordinary Shares may not be offered or sold to, or for the account or benefit of, any ADR holder. Subject to certain exceptions, no action has been taken by the Company or by the Sponsor that would permit an offer of the Ordinary Shares or possession or distribution of this announcement in any other jurisdiction where action for that purpose is required, other than the United Kingdom. No public offering of the shares referred to in this announcement is being made.

This announcement has been issued by, and is the sole responsibility of, the Company. No representation or warranty, express or implied, is or will be made as to, or in relation to, and no responsibility or liability is or will be accepted by the Sponsor or by any of its affiliates or agents as to or in relation to, the accuracy or completeness of this announcement or any other written or oral information made available to or publicly available to any interested party or its advisers, and any liability therefore is expressly disclaimed.

J.P. Morgan Securities plc (which conducts its UK investment banking business as J.P. Morgan Cazenove), which is authorised by the Prudential Regulation Authority (the "PRA") and regulated in the United Kingdom by the Financial Conduct Authority (the "FCA") and the PRA, is acting exclusively for the Company and no one else in connection with the proposed Admission, and will not regard any other person (whether or not a recipient of this document) as a client in relation to the proposed Admission, and will not be responsible to anyone other than the Company for providing the protections afforded to their respective clients, nor for providing advice, in relation to the proposed Admission or any other matter referred to in this announcement.

Apart from the responsibilities and liabilities, if any, which may be imposed on the Sponsor by the Financial Service and Markets Act 2000, as amended, or the regulatory regime established thereunder, or by the London Stock Exchange or the AIM Rules, or under the regulatory regime of any jurisdiction where exclusion of liability under the relevant regulatory regime would be illegal, void or unenforceable, neither the Sponsor, nor any of its affiliates, directors, officers, employees or advisers accepts any responsibility whatsoever for, or makes any representation or warranty, express or implied, as to the contents of this announcement, including its accuracy or completeness, or for any other statement made or purported to be made by it, or on behalf of it, the Company, the Directors or any other person, in connection with Admission, and nothing in this document should be relied upon as a promise or representation in this respect, whether or not to the past or future. The Sponsor and its affiliates, directors, officers, employees and advisers accordingly disclaims to the fullest extent permitted by law all and any responsibility or liability whatsoever, whether arising in tort, contract or otherwise (save as referred to above), which it might otherwise have in respect of this announcement or any such statement.

Statements contained in this announcement regarding past trends or activities should not be taken as a representation that such trends or activities will continue in the future.

No statement in this announcement is or is intended to be a profit forecast or profit estimate or to imply that the earnings of the Company for the current or future financial years will necessarily match or exceed the historical or published earnings of the Company. The price of shares and the income from them may go down as well as up and investors may not get back the full amount invested on disposal of the shares.

Neither the content of the Company's website nor any website accessible by hyperlinks on the Company's website is incorporated in, or forms part of, this announcement.