Groupe Bruxelles Lambert SA

Transaction in Own Shares • Nov 24, 2025

Delivering meaningful growth

Transactions on GBL Shares

Disclosure of transaction on GBL shares from November 17, 2025, until November 21, 2025 (included) Implementation of the authorization of the Extraordinary General Shareholders' Meeting of May 2, 2025

Purchases

GBL, directly and through its subsidiaries, acquired during the period from November 17, 2025 until November 21, 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 March 13, 2026) in the central order book of a regulated market or MTF: 127,429 GBL shares

Trade date	Number of shares	Average price (EUR)	Lowest price (EUR)	Highest price (EUR)	Amount (EUR)	Market (MIC Code)
11/17/2025	1,456	74.09	73.85	74.30	107,876	AQEU
11/17/2025	8,477	74.09	73.85	74.45	628,069	CEUX
11/17/2025	1,800	74.09	73.90	74.40	133,367	TQEX
11/17/2025	3,020	74.09	73.85	74.40	223,751	XBRU
11/18/2025	1,651	73.07	72.80	73.40	120,641	AQEU
11/18/2025	11,800	73.08	72.75	73.45	862,386	CEUX
11/18/2025	2,155	73.04	72.80	73.30	157,391	TQEX
11/18/2025	17,982	72.95	72.75	73.40	1,311,751	XBRU
11/19/2025	1,300	72.83	72.35	73.20	94,679	AQEU
11/19/2025	6,449	72.79	72.30	73.15	469,414	CEUX
11/19/2025	2,000	72.86	72.30	73.20	145,712	TQEX
11/19/2025	15,087	72.81	72.30	73.20	1,098,439	XBRU
11/20/2025	1,700	73.07	72.90	73.30	124,227	AQEU
11/20/2025	6,731	73.10	72.90	73.25	492,027	CEUX
11/20/2025	2,400	73.10	72.90	73.25	175,430	TQEX
11/20/2025	13,847	72.74	72.65	73.25	1,007,180	XBRU
11/21/2025	1,700	72.68	71.95	72.95	123,550	AQEU
11/21/2025	6,967	72.72	72.00	73.00	506,645	CEUX
11/21/2025	2,300	72.69	72.05	73.00	167,176	TQEX
11/21/2025	18,607	72.78	71.85	73.00	1,354,149	XBRU
Total	127,429	73.01			9,303,861

• The liquidity agreement: 0 GBL share

Sales

GBL, directly and through its subsidiaries, sold during the period from November 17, 2025 until November 21, 2025 included, as part of:

• The liquidity agreement: 0 GBL share

As of November 21, 2025, GBL holds directly and through its subsidiaries 11,963,692 GBL shares representing 9.0% of the issued capital and holds no shares under the liquidity agreement. On that date, 19.5% of the eighth 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

Xavier Likin Alison Donohoe

Chief Financial Officer Head of Investor Relations xlikin@gbl.com adonohoe@gbl.com

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 €14.0bn at the end of September 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 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