Update in relation to Petra Diamonds UK Treasury Limited

THIS ANNOUNCEMENT CONTAINS INSIDE INFORMATION

FOR IMMEDIATE RELEASE

2 October 2026

LSE: PDL

Petra Diamonds Limited

(the “Company”)

Update in relation to Petra Diamonds UK Treasury Limited

The Company announces that a winding-up petition in respect of Petra Diamonds UK Treasury Limited ("PDUK Treasury"), a wholly owned, indirect subsidiary of the Company, has today been advertised in the London Gazette by HM Revenue & Customs ("HMRC") (the "Petition") in respect of £5,647,811.32 for the year ended 30 June 2025, due to HMRC in relation to corporation tax. This arose in respect of interest income accrued on a receivable due from Ealing Management Services (Proprietary) Limited, another indirectly, wholly owned subsidiary of the Company and affiliate of PDUK Treasury. This liability to tax arose notwithstanding that the accrued interest was not and has not been received by PDUK Treasury from its affiliate. Both PDUK Treasury and Ealing Management Services (Proprietary) Limited are non-operating subsidiaries of the Company and do not own or operate any of Petra’s mining operations.

The Petition has been filed with the court and the hearing date for the Petition is scheduled for 14 October 2026. The Petition relates solely to PDUK Treasury and does not directly affect the Group’s mining operations. The Company is assessing the implications of the Petition for the Group’s financing arrangements and ongoing refinancing discussions

The Company will provide a further update as and when appropriate.

The person responsible for releasing this announcement is Tumi Dakada, Acting General Counsel and Company Secretary of the Company.

FURTHER INFORMATION

For further information, please contact:

Investor Relations, London

       Telephone: [phone]

Julia Stone and Kelsey Traynor   [e-mail]

About Petra Diamonds Limited

Petra Diamonds is a leading independent diamond mining group and a supplier of gem quality rough diamonds to the international market. The Company’s portfolio incorporates interests in two underground mines in South Africa (Cullinan Mine and Finsch). The Group’s principal operating asset is Cullinan Mine. Finsch entered business rescue on 29 May 2026.

Petra strives to conduct all operations according to the highest ethical standards and only operates in countries which are members of the Kimberley Process. The Company aims to generate tangible value for each of its stakeholders, thereby contributing to the socio-economic development of its host countries and supporting long-term sustainable operations to the benefit of its employees, partners and communities.

Petra is quoted on the Main Market of the London Stock Exchange under the ticker 'PDL'. The Company’s loan notes, due in 2030, are listed on EuroNext Dublin (Irish Stock Exchange). For more information, visit www.petradiamonds.com.

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