Groupe Bruxelles Lambert SA

Transaction in Own Shares • Jun 16, 2025

Transactions on GBL Shares

Disclosure of transaction on GBL shares from June 9, 2025, untilJune 13, 2025 (included) Implementation of the authorization of the Extraordinary General Shareholders' Meeting of April 28, 2020

Purchases

GBL, directly and through its subsidiaries, acquired during the period from June 9, 2025 until June 13, 2025 included, as part of:

• The share buyback program: 0 GBL share
• The share buyback program by an independent financial institution on the basis of a discretionary mandate (until August 2, 2025) in the central order book of a regulated market or MTF: 91,580 GBL shares

Trade date	Number of shares	Average price (EUR)	Lowest price (EUR)	Highest price (EUR)	Amount (EUR)	Market (MIC Code)
06/09/2025	607	72.80	72.75	72.85	44,189	CEUX
06/09/2025	1,737	72.85	72.75	73.00	126,547	TQEX
06/09/2025	3,576	72.89	72.75	73.05	260,656	XBRU
06/10/2025	4,384	73.39	73.15	73.55	321,756	CEUX
06/10/2025	3,439	73.43	73.25	73.60	252,535	TQEX
06/10/2025	11,488	73.44	73.00	73.60	843,694	XBRU
06/11/2025	6,686	73.58	73.45	73.70	491,947	CEUX
06/11/2025	3,108	73.58	73.45	73.65	228,689	TQEX
06/11/2025	17,831	73.52	73.40	73.75	1,310,917	XBRU
06/12/2025	6,235	73.04	72.55	73.40	455,416	CEUX
06/12/2025	1,615	73.12	72.60	73.25	118,095	TQEX
06/12/2025	17,150	73.02	72.45	73.40	1,252,362	XBRU
06/13/2025	3,770	72.11	71.80	72.50	271,868	CEUX
06/13/2025	2,356	72.13	71.80	72.55	169,936	TQEX
06/13/2025	7,598	72.15	71.75	72.55	548,191	XBRU

• The liquidity agreement: 0 GBL share

Sales

GBL, directly and through its subsidiaries, sold during the period from June 9, 2025 until June 13, 2025 included, as part of:

• The liquidity agreement: 0 GBL share

As of June 13, 2025, GBL holds directly and through its subsidiaries 9,800,526 GBL shares representing 7.4% of the issued capital and holds no shares under the liquidity agreement. On that date, 87.3% of the seventh share buyback program is executed1.

Following GBL's decision to use the safe harbour2 regime for the on-the-market share buybacks in the context of a EUR 598.9 million envelope, the liquidity contract with an independent financial institution has been suspended for an indefinite period.

For more information, please contact:

Tel: +32 2 289 17 72 Tel: +32 2 289 17 64 xlikin@gbl.com adonohoe@gbl.com

Xavier Likin Alison Donohoe

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 €15.4bn at the end of March 2025. 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.

¹ cf. http://www.gbl.com/en/transactions-gbl-shares

² Provided for in Regulation (EU) No. 596/2014 of 16 April 2014 on market abuse and Delegated Regulation (EU) No. 2016/1052 of 8 March 2016 with regard to regulatory technical standards for the terms of buyback programs and stabilization measures