Elia Group NV/SA

Major Shareholding Notification • Sep 4, 2025

PRESS RELEASE | 4 September 2025

Transparency notification – ATLAS Infrastructure Partners

BRUSSELS - BERLIN | 6.00 PM (CEST) – regulated information

1. Summary of the notification

Pursuant to Article 14 of the law of 2 May 2007 on the disclosure of large shareholdings, Elia Group SA/NV announces that it has received a transparency notification dated 1 st September 2025 from ATLAS Infrastructure Partners (having its registered offices at 1-3 College Hill, London EC4R 2RA, United Kingdom).

ATLAS Infrastructure Partners has notified that, following a disposal of Elia Group shares with voting rights, its shareholding in Elia Group has crossed the 5%-threshold downwards on 26 August 2025.

On 26 August 2025, ATLAS Infrastructure Partners owned 5,384,329 Elia Group shares with voting rights, representing 4.94% of the total number of shares issued by the company (109,072,607).

2. Content of the notification

The transparency notification dated 1 st September 2025 includes the following information:

• Reason for the notification: Acquisition or disposal of voting securities or voting rights.
• Notification by: A person that notifies alone.
• Person subject to the notification requirement:

Name	Address (for legal entities)
ATLAS Infrastructure Partners	1-3 College Hill, London EC4R 2RA

• Date on which the threshold is crossed: 26 August 2025.
• Threshold crossed (in %): 5%.
• Denominator: 109,072,607.

• Notified details:

A) Voting rights	Previous notification	After the transaction
	# of voting rights	# of voting rights		% of voting rights
Holders of voting rights		Linked to securities	Not linked to the securities	Linked to securities	Not linked to the securities
ATLAS Infrastructure Partners		5.384.329	0
	TOTAL	5.384.329	0	4,94%	0,00%

B) Equivalent financial instruments	After the transaction
Holders of equivalent financial instruments	Type of financial instrument		Expiration date Exercise period or date	# of voting rights that may be acquired if the instrument is exercised	% of voting rights	Settlement
	TOTAL			0	0,00%

TOTAL (A & B)			# of voting rights % of voting rights
	CALCULATE	5.384.329	4,94%

• Chain of controlled undertakings through which the holding is effectively held:

ATLAS Infrastructure is not a controlled entity.

• Additional information: Not applicable.
• 3. Further information

This press release and the detailed transparency notification are available on Elia Group SA/NV's website.

An updated overview of the Elia Group SA/NV large shareholdings is available also on Elia Group SA/NV's website.

About Elia Group

One of Europe's top five TSOs

Elia Group is a key player in electricity transmission. We ensure that production and consumption are balanced around the clock, supplying 30 million end users with electricity. Through our subsidiaries in Belgium (Elia) and the north and east of Germany (50Hertz), we operate 19,741 km of high-voltage connections, meaning that we are one of Europe's top 5 transmission system operators. With a reliability level above 99%, we provide society with a robust power grid, which is important for socioeconomic prosperity. We also aspire to be a catalyst for a successful energy transition, helping to establish a reliable, sustainable and affordable energy system.

We are making the energy transition happen

By expanding international high-voltage connections and incorporating ever-increasing amounts of renewable energy into our grid, we are promoting both the integration of the European energy market and the decarbonisation of society. We also continuously optimise our operational systems and develop new market products so that new technologies and market parties can access our grid, thus further facilitating the energy transition.

In the interest of society

As a key player in the energy system, Elia Group is committed to working in the interest of society. We are responding to the rapid increase in renewable energy by constantly adapting our transmission grid. We also ensure that investments are made on time and within budget, with a maximum focus on safety. In carrying out our projects, we manage stakeholders proactively by establishing two-way communication channels between all relevant parties very early on in the development process. We also offer our expertise to different players across the sector in order to build the energy system of the future.

International focus

In addition to its activities as a transmission system operator, Elia Group provides consulting services to international customers through its subsidiary Elia Grid International. In recent years, the Group has launched new non-regulated activities such as re.alto - the first European marketplace for the exchange of energy data via standardised energy APIs - and WindGrid, a subsidiary which will continue to expand the Group's overseas activities, contributing to the development of offshore electricity grids in Europe and beyond.

The legal entity Elia Group is a listed company whose core shareholder is the municipal holding company Publi-T/NextGrid Holding.

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For further information, please contact:

Investor Relations

Yannick Dekoninck | M +32 478 90 13 16 | investor.relations@elia.be Stéphanie Luyten | M +32 467 05 44 95 | investor.relations@elia.be Corporate Communication Marleen Vanhecke | M +32 486 49 01 09 | marleen.vanhecke@elia.be

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