JADESTONE ENERGY PLC

Major Shareholding Notification • Jul 23, 2025

National Storage Mechanism | Additional information

RNS Number : 0848S

Jadestone Energy PLC

23 July 2025

TR-1: Notification of Major Holdings

23 July 2025 - Singapore: Jadestone Energy plc (AIM:JSE) (the "Company" and together with its subsidiaries, "Jadestone" or the "Group"), an independent upstream production and development company focused on the Asia-Pacific region, announces that it has been notified by Tyrus Capital, S.A.M that its shareholding in the Company has increased from 27.42% to 28.48%.

TR-1: Standard form for notification of major holdings

NOTIFICATION OF MAJOR HOLDINGS (to be sent to the relevant issuer and to the FCA in Microsoft Word format if possible)
1a. Identity of the issuer or the underlying issuer of existing shares to which voting rights are at- tached ii :	Jadestone Energy Plc
1b. Please indicate if the issuer is a non-UK issuer (please mark with an "X" if appropriate)
Non-UK issuer
2. Reason for the notification (please mark the appropriate box or boxes with an "X")
An acquisition or disposal of voting rights		X
An acquisition or disposal of financial instruments
An event changing the breakdown of voting rights
Other (please specify) iii :
3. Details of person subject to the notification obligation iv
Name	Tyrus Capital, S.A.M
City and country of registered office (if applicable)	Monaco
4. Full name of shareholder(s) (if different from 3.) v
Name	Tyrus Capital Special Situations Master Fund Sarl, SICAV-RAIF, TC Six Limited, TC Special Private Equity Opportunities IV Limited

City and country of registered office (if applicable)			Grand Cayman, Cayman Islands (for TC Six Limited and TC Special Private Equity Opportunities IV Limited) and Luxembourg (for Tyrus Capital Special Situations Master Fund Sarl, SICAV-RAIF)
5. Date on which the threshold was crossed or reached vi :			21 July 2025
6. Date on which issuer notified (DD/MM/YYYY):			22 July 2025
7. Total positions of person(s) subject to the notification obligation
	% of voting rights at- tached to shares (to- tal of 8. A)	% of voting rights through financial instru- ments (total of 8.B 1 + 8.B 2)		Total of both in % (8.A + 8.B)	Total number of voting rights held in issuer (8.A + 8.B) vii
Resulting situation on the date on which threshold was crossed or reached	28.47743%	0.00000%		28.47743%	154,094,444
Position of previous notification (if applicable)	27.41518%	0.00000%		27.41518%

8. Notified details of the resulting situation on the date on which the threshold was crossed or reached viii
A: Voting rights attached to shares
Class/type of shares ISIN code (if possible)	Number of voting rights ix				% of voting rights
Direct (DTR5.1)		Indirect (DTR5.2.1)		Direct (DTR5.1)	Indirect (DTR5.2.1)
GB00BLR71299	0		154,094,444		0.00000%	28.47743%
SUBTOTAL 8. A	154,094,444				28.47743%
B 1: Financial Instruments according to DTR5.3.1R (1) (a)
Type of financial in- strument	Expiration date x	Exercise/ Conversion Period xi		Number of voting rights that may be acquired if the instrument is exercised/converted.		% of voting rights

			SUBTOTAL 8. B 1
B 2: Financial Instruments with similar economic effect according to DTR5.3.1R (1) (b)
Type of financial instrument	Expiration date x		Exercise/ Conversion Pe- riod xi	Physical or cash Settlement xii		Number of voting rights	% of voting rights
				SUBTOTAL 8.B.2

9. Information in relation to the person subject to the notification obligation (please mark the applicable box with an "X")
Person subject to the notification obligation is not controlled by any natural person or legal entity and does not control any other undertaking(s) holding directly or indirectly an interest in the (underlying) issuer xiii
Full chain of controlled undertakings through which the voting rights and/or the financial instruments are effectively held starting with the ultimate controlling natural person or legal entity (please add additional rows as necessary) xiv
Name xv	% of voting rights if it equals or is higher than the notifiable threshold	% of voting rights through financial in- struments if it equals or is higher than the notifiable threshold	Total of both if it equals or is higher than the notifiable threshold
10. In case of proxy voting, please identify:
Name of the proxy holder

The number and % of voting rights held
The date until which the voting rights will be held
11. Additional information xvi

Place of completion	Monaco
Date of completion	22 July 2025

-ends-

For further information, please contact:

Jadestone Energy plc
Phil Corbett, Head of Investor Relations	+44 (0) 7713 687467 (UK)
	[email protected]
Stifel Nicolaus Europe Limited (Nomad, Joint Broker)	+44 (0) 20 7710 7600 (UK)
Callum Stewart
Jason Grossman
Ashton Clanfield
Berenberg (Joint Broker)	+44 (0) 20 3757 4980 (UK)
Ciaran Walsh
Dan Gee-Summons
Yasmina Benchekroun
Camarco (Public Relations Advisor)	+44 (0) 203 757 4980 (UK)
Billy Clegg	[email protected]
Georgia Edmonds
Poppy Hawkins

About Jadestone Energy

Jadestone Energy plc is an independent upstream company focused on the Asia-Pacific region. It has a balanced and increasingly diversified portfolio of production and development assets in Australia, Malaysia, Indonesia and Vietnam, all stable jurisdictions with a positive upstream investment climate.

The Company is pursuing a strategy to grow and diversify the Company's production base both organically, through developments such as Nam Du/U Minh in Vietnam and the Puteri Cluster offshore Malaysia, as well as through acquisitions that fit within Jadestone's financial framework and play to the Company's strengths in managing maturing oil assets. Jadestone delivers value in its acquisition strategy by enhancing returns through operating efficiencies, cost reductions and increased production through further investment.

Jadestone is a responsible operator and well positioned for the energy transition through its increasing gas production, by maximising recovery from existing brownfield developments and through its Net Zero pledge on Scope 1 & 2 GHG emissions from operated assets by 2040. This strategy is aligned with the IEA Net Zero by 2050 scenario, which stresses the necessity of continued investment in existing upstream assets to avoid an energy crisis and meet demand for oil and gas through the energy transition.

Jadestone Energy plc (LEI: 21380076GWJ8XDYKVQ37) is listed on the AIM market of the London Stock Exchange (AIM: JSE).  The Company is headquartered in Singapore.  For further information on the Company please visit www.jadestone-energy.com .

This announcement does not include inside information.

This information is provided by RNS, the news service of the London Stock Exchange. RNS is approved by the Financial Conduct Authority to act as a Primary Information Provider in the United Kingdom. Terms and conditions relating to the use and distribution of this information may apply. For further information, please contact [email protected] or visit www.rns.com.

RNS may use your IP address to confirm compliance with the terms and conditions, to analyse how you engage with the information contained in this communication, and to share such analysis on an anonymised basis with others as part of our commercial services. For further information about how RNS and the London Stock Exchange use the personal data you provide us, please see our Privacy Policy.

END

HOLUUSRRVWUBUAR