Groupe Bruxelles Lambert SA

Major Shareholding Notification • Apr 28, 2025

Transparency notification by Artisan Partners Limited Partnership and Artisan Partners Asset Management Inc.

1. Summary of the notification

In accordance with article 14 § 1 of the law of May 2, 2007 on disclosure of major shareholdings, Groupe Bruxelles Lambert ("GBL") has received a transparency notification dated April 22, 2025 indicating that as of April 16, 2025 Artisan Partners Limited Partnership and Artisan Partners Asset Management Inc. held 5.03% of GBL's voting rights.

2. Content of the notification

The notification dated April 22, 2025 contains the following information:

• Reason for the notification:
  • Acquisition or disposal of voting securities or voting rights
  • Upward crossing of the lowest threshold
• Notification by a parent undertaking or a controlling person
• Persons subject to the notification requirement:
  • Artisan Partners Limited Partnership
  • Artisan Partners Asset Management Inc.
• Transaction date: April 16, 2025
• Threshold that is crossed (upper): 5%
• Denominator: 193,886,325
• Notified details:
  • A. Voting rights

Holders of voting rights	Previous notification	After the transaction
	# voting rights	# of voting rights linked to securities	# voting rights not linked to securities	% voting rights linked to securities	% voting rights not linked to securities
Artisan Partners Asset Management Inc.		0	0	0.00%	0.00%
Artisan Partners Limited Partnership		9,754,758	0	5.03%	0.00%
Total		9,754,758	0	5.03%	0.00%

B. Equivalent financial instruments

Holders of	Type of	Expiration	Exercise period	# of voting rights	% of voting rights	Settlement
equivalent	financial	date	or date	that may be
financial	instruments			acquired if the
instruments				instrument is
				exercised
-	-	-	-	-	-
Total				0	0.00%

Total A+B	# of voting rights	% of voting rights
	9,754,758	5.03%

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

Artisan Partners Limited Partnership ("APLP"), a U.S. registered investment adviser, is a limited partnership organized under the laws of the State of Delaware. APLP is controlled by Artisan Investments GP LLC ("Artisan LLC"), a limited liability company organized under the laws of the State of Delaware. Artisan LLC is controlled by Artisan Partners Holdings LP. Artisan Partners Holdings LP is controlled by Artisan Partners Asset Management Inc. Artisan Partners Asset Management Inc. is not a controlled entity.

• Additional information

Under a contractual proxy, APLP exercises voting rights in GBL on a discretionary basis for a number of clients, of which no client individually holds shares representing 5% or more of the voting rights in GBL. APLP is an investment adviser registered with the United States Securities and Exchange Commission under the U.S. Investment Advisers Act of 1940.

This press release is available on GBL's website.

The detailed notification can be found here.

For more information, please contact:

Xavier Likin Alison Donohoe Tel: +32 2 289 17 72 Tel: +32 2 289 17 64 xlikin@gbl.com adonohoe@gbl.com

Chief Financial Officer Head of Investor Relations

About Groupe Bruxelles Lambert

Groupe Bruxelles Lambert ("GBL") is an established investment holding company, with seventy years of stock exchange listing and a net asset value of €15.7bn at the end of December 2024. As a leading and active investor in Europe, GBL focuses on long-term value creation with the support of a stable family shareholder base.

GBL aims to grow its diversified high-quality portfolio of listed, direct private and indirect private investments.

GBL is focused on delivering meaningful growth by providing attractive returns to its shareholders through a combination of growth in its net asset value per share, a sustainable dividend and share buybacks.

GBL is listed on Euronext Brussels (Ticker: GBLB BB; ISIN code: BE0003797140) and is included in the BEL20 index.