Groupe Bruxelles Lambert SA

Transaction in Own Shares • May 19, 2025

Transactions on GBL Shares

Disclosure of transaction on GBL shares from May 12, 2025, until May 16, 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 May 12, 2025 until May 16, 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: 86,435 GBL shares

	Number of	Average price	Lowest price	Highest price	Amount	Market
Trade date	shares	(EUR)	(EUR)	(EUR)	(EUR)	(MIC Code)
05/12/2025	4,898	71.55	71.20	71.95	350,439	CEUX
05/12/2025	1,771	71.54	71.40	71.70	126,694	TQEX
05/12/2025	17,097	71.46	71.10	71.95	1,221,707	XBRU
05/13/2025	4,627	71.50	71.15	71.75	330,814	CEUX
05/13/2025	2,847	71.52	71.20	71.65	203,604	TQEX
05/13/2025	8,542	71.52	71.15	71.80	610,925	XBRU
05/14/2025	4,942	71.77	71.60	72.10	354,693	CEUX
05/14/2025	1,779	71.82	71.55	72.10	127,763	TQEX
05/14/2025	8,656	71.80	71.55	72.10	621,521	XBRU
05/15/2025	4,364	71.88	71.60	72.15	313,663	CEUX
05/15/2025	1,086	71.92	71.70	72.05	78,110	TQEX
05/15/2025	8,622	71.91	71.60	72.10	619,968	XBRU
05/16/2025	5,812	72.50	72.35	72.55	421,347	CEUX
05/16/2025	1,358	72.37	72.35	72.45	98,284	TQEX
05/16/2025	10,034	72.40	72.25	72.55	726,417	XBRU

• The liquidity agreement: 0 GBL share

Sales

GBL, directly and through its subsidiaries, sold during the period from May 12, 2025 until May 16, 2025 included, as part of:

• The liquidity agreement: 0 GBL share

As of May 16, 2025, GBL holds directly and through its subsidiaries 9,401,292 GBL shares representing 7.1% of the issued capital and holds no shares under the liquidity agreement. On that date, 81.5% 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