Groupe Bruxelles Lambert SA

Transaction in Own Shares • Mar 10, 2025

Transactions on GBL Shares

Disclosure of transaction on GBL shares from March3, 2025, untilMarch7, 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 March 3, 2025 until March 7, 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 14, 2025) in the central order book of a regulated market or MTF: 186,562 GBL shares

Trade date	Number of shares	Average price (EUR)	Lowest price (EUR)	Highest price (EUR)	Amount (EUR)	Market (MIC Code)
03/03/2025	1,767	69.67	68.60	70.40	123,105	AQEU
03/03/2025	7,404	69.63	68.60	70.55	515,563	CEUX
03/03/2025	3,170	69.79	68.55	70.50	221,244	TQEX
03/03/2025	26,086	70.07	68.60	70.60	1,827,966	XBRU
03/04/2025	1,834	69.58	69.40	69.80	127,607	AQEU
03/04/2025	7,437	69.59	69.35	69.90	517,517	CEUX
03/04/2025	3,178	69.53	69.30	69.90	220,960	TQEX
03/04/2025	21,868	69.49	69.25	69.90	1,519,620	XBRU
03/05/2025	1,891	70.31	69.95	70.65	132,950	AQEU
03/05/2025	7,630	70.34	69.95	70.70	536,664	CEUX
03/05/2025	3,201	70.28	69.95	70.65	224,955	TQEX
03/05/2025	20,566	70.21	69.95	70.70	1,444,003	XBRU
03/06/2025	1,899	69.89	69.50	70.35	132,721	AQEU
03/06/2025	10,432	69.97	69.35	70.40	729,916	CEUX
03/06/2025	3,248	69.86	69.45	70.40	226,905	TQEX
03/06/2025	28,750	69.92	69.40	70.45	2,010,303	XBRU
03/07/2025	1,984	69.92	69.75	70.00	138,714	AQEU
03/07/2025	7,635	69.91	69.75	70.05	533,767	CEUX
03/07/2025	3,206	70.00	69.75	70.35	224,423	TQEX
03/07/2025	23,376	70.04	69.75	70.40	1,637,180	XBRU

• The liquidity agreement: 0 GBL share

Sales

GBL, directly and through its subsidiaries, sold during the period from March 3, 2025 until March 7, 2025 included, as part of:

• The liquidity agreement: 0 GBL share

As of March 7, 2025, GBL holds directly and through its subsidiaries 14,332,222 GBL shares representing 10.4% of the issued capital and holds no shares under the liquidity agreement. On that date, 77.7% 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 500 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 €16.3bn at the end of September 2024. As a leading and active investor in Europe, GBL focuses on long-term value creation with the support of a stable family shareholder base. As a responsible company and investor, GBL perceives ESG factors as being inextricably linked to value creation.

GBL aims to grow its diversified high-quality portfolio of listed, private and alternative 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