Groupe Bruxelles Lambert SA

Transaction in Own Shares • Aug 4, 2025

Transactions on GBL Shares

Disclosure of transaction on GBL shares from July 28, 2025, until August 1, 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 July 28, 2025 until August 1, 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: 94,614 GBL shares

Trade date	Number of shares	Average price (EUR)	Lowest price (EUR)	Highest price (EUR)	Amount (EUR)	Market (MIC Code)
07/28/2025	5,377	76.64	76.50	76.90	412,091	CEUX
07/28/2025	1,669	76.77	76.55	76.90	128,130	TQEX
07/28/2025	12,954	76.69	76.55	76.90	993,490	XBRU
07/29/2025	3,001	76.15	75.95	76.40	228,532	CEUX
07/29/2025	1,740	76.08	75.95	76.20	132,373	TQEX
07/29/2025	8,776	76.10	75.95	76.45	667,849	XBRU
07/30/2025	5,587	75.49	75.00	75.90	421,778	CEUX
07/30/2025	1,705	75.76	75.70	75.85	129,165	TQEX
07/30/2025	13,450	75.13	74.45	75.85	1,010,447	XBRU
07/31/2025	5,303	74.05	73.70	74.35	392,666	CEUX
07/31/2025	1,932	73.85	73.65	74.15	142,681	TQEX
07/31/2025	9,344	73.99	73.60	74.40	691,396	XBRU
08/01/2025	6,334	72.54	72.00	73.00	459,466	CEUX
08/01/2025	1,983	72.89	72.70	73.20	144,534	TQEX
08/01/2025	15,459	72.43	72.00	73.20	1,119,729	XBRU

• The liquidity agreement: 0 GBL share

Sales

GBL, directly and through its subsidiaries, sold during the period from July 28, 2025 until August 1, 2025 included, as part of:

• The liquidity agreement: 0 GBL share

As of August 1, 2025, GBL holds directly and through its subsidiaries 10,522,491 GBL shares representing 7.9% of the issued capital and holds no shares under the liquidity agreement. On that date, 97.8% 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 €14.4bn at the end of June 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