Arverne increases its stake in its subsidiary Lithium de France, Hydro Energy Invest AS becomes a shareholder in Arverne

In this context, Hydro Energy Invest AS transfers its 474,753 Lithium de France shares to Arverne Group. In return, 2,232,288 new Arverne Group shares are issued to Hydro Energy Invest AS, with a value of €22,322,880, representing an Arverne Group share value of €10.00.

In accordance with the terms of the agreement, Hydro Energy Invest AS will have the right to request the appointment of an observer to the Arverne board of directors for as long as Hydro Energy Invest AS holds at least 5% of Arverne Group share capital. Hydro Energy Invest AS is committed to retain its Arverne Group shares until the earlier of the date of completion of a significant capital increase by Arverne Group and a period of 18 months from the date of completion of the contribution.

Pierre Brossollet, founder and CEO of Arverne: "By increasing its stake in Lithium de France, Arverne is strengthening its position as France's leading supplier of geothermal solutions, including critical metals contained in brines. I am delighted to welcome our partner Hydro Energy Invest AS as a new Arverne’s shareholder, to combine our expertise to promote the development of sustainable energies."

Settlement-Delivery
The admission of the New Shares to trading on the Euronext Paris market is completed on October 6, 2025 and the settlement and delivery on October 10, 2025.
The New Shares are immediately assimilated to the Company's existing shares and are traded on the same listing line as the latter under the same ISIN code: FR001400JWR8 – Ticker symbol: ARVEN.
Upon settlement and delivery, the Company's share capital will amount to four hundred and twenty thousand seven hundred and sixty euros and eighty-one cents (€420,760.81). It is divided into forty-two million seventy-six thousand eighty-one (42,076,081) shares with a par value of €0.01 each, fully paid up including thirty-seven million twenty-eight thousand three hundred and five (37,028,305) Common Shares.

Impact of the transaction on the shareholding structure of Arverne Group
Following the issue of 2,232,288 new shares and to the Company's knowledge, the share capital is distributed as follows:

Impact of the transaction on Lithium de France's shareholding structure
Arverne Group now holds 73.8% of the capital, Equinor Ventures 24.4% and management 1.8%.

About ARVERNE
ARVERNE is the leading French supplier of geothermal solutions.
It specialises in harnessing natural ground resources to transform them into local energy sources for heating and cooling systems and to extract lithium. A mission-driven company listed on Euronext Paris, Arverne works for local authorities and industrial companies with a focus on energy sovereignty and short supply chains.
www.arverne.earth

About Hydro
Hydro is a leading company in the field of aluminum and renewable energy that develops businesses and partnerships for a more sustainable future. It employs 32,000 people in more than 140 locations and 42 countries.

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