Groupe Bruxelles Lambert SA

Transaction in Own Shares • Jul 14, 2025

Transactions on GBL Shares

Disclosure of transaction on GBL shares from July 7, 2025, untilJuly 11, 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 7, 2025 until July 11, 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: 60,474 GBL shares

Trade date	Number of shares	Average price (EUR)	Lowest price (EUR)	Highest price (EUR)	Amount (EUR)	Market (MIC Code)
07/07/2025	3,118	73.03	72.70	73.20	227,694	CEUX
07/07/2025	923	73.05	73.00	73.15	67,426	TQEX
07/07/2025	13,926	73.03	72.55	73.20	1,016,996	XBRU
07/08/2025	2,633	72.96	72.85	73.05	192,094	CEUX
07/08/2025	523	73.05	73.00	73.10	38,205	TQEX
07/08/2025	4,173	72.97	72.70	73.20	304,495	XBRU
07/09/2025	2,235	73.22	73.10	73.35	163,649	CEUX
07/09/2025	2,405	73.22	73.10	73.30	176,084	TQEX
07/09/2025	5,272	73.19	73.00	73.40	385,880	XBRU
07/10/2025	3,217	73.78	73.40	73.95	237,355	CEUX
07/10/2025	3,043	73.77	73.45	74.00	224,485	TQEX
07/10/2025	8,232	73.76	73.40	74.00	607,169	XBRU
07/11/2025	2,182	73.73	73.65	73.90	160,875	CEUX
07/11/2025	2,993	73.76	73.60	73.90	220,749	TQEX
07/11/2025	5,599	73.71	73.55	73.90	412,726	XBRU

• The liquidity agreement: 0 GBL share

Sales

GBL, directly and through its subsidiaries, sold during the period from July 7, 2025 until July 11, 2025 included, as part of:

• The liquidity agreement: 0 GBL share

As of July 11, 2025, GBL holds directly and through its subsidiaries 10,276,878 GBL shares representing 7.7% of the issued capital and holds no shares under the liquidity agreement. On that date, 94.2% 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