Tessenderlo Group nv

Report Publication Announcement • Dec 18, 2025

PRESS RELEASE

Regulated information 1 December 18, 2025, 5:40 pm CET

TESSENDERLO GROUP: DISCLOSURE IN ACCORDANCE WITH THE REQUIREMENTS OF THE TRANSPARENCY LAW

Tessenderlo Group (Euronext: TESB) discloses information required under article 15, §1 of the Law of May 2, 2007, regarding the disclosure of important shareholdings in listed companies.

Pursuant to the authorization granted by the extraordinary general meeting of May 10, 2022, the Board of Directors of Tessenderlo Group nv decided to cancel 1,096,747 treasury shares purchased under the share repurchase programs launched in January 2025 and May 2025. Following the cancellation of these treasury shares, the denominator changed from 60,159,303 shares to 59,062,556 shares on December 17, 2025.

Status as of December 18, 2025

Total outstanding capital: 428,268,879.25 EUR

Total number of outstanding ordinary shares: 59,062,556 Total number of voting rights (the denominator): 98,987,136

Total number of outstanding warrants: 0

(each warrant entitles the holder to subscribe to one new ordinary share)

Notifications:

According to Tessenderlo Group nv bylaws, the threshold as from which a shareholding needs to be disclosed has been set at 1%, 3%, 5%, 7.5% as well as each multiple of 5%, in either direction. Notifications of important shareholdings to be made according to the Law of May 2, 2007 or Tessenderlo Group's bylaws, should be sent to Tessenderlo Group (IR@Tessenderlo.com), as well as to the Belgian Financial Services and Markets Authority (FSMA) at trp.fin@fsma.be.

This information is also available on www.tessenderlo.com.

¹ The information provided includes regulated information, as defined in the Royal Decree of November 14, 2007, regarding the duties of issuers of financial instruments permitted to trade on regulated markets.

About Tessenderlo Group

Tessenderlo Group is an industrial group that focuses on agriculture, valorizing bio-residuals, machinery, mechanical engineering, electronics, energy, and providing industrial solutions with a focus on water. With its headquarters in Belgium, the group is active in over 100 countries and it has a global team of more than 7,000 employees. Its belief that "Every Molecule Counts" is at the heart of the strategy of the group: Tessenderlo Group continually strives to valorize its products and processes to the maximum and to add value to everything it does. In 2024, Tessenderlo Group recorded a consolidated revenue of 2.6 billion EUR. Tessenderlo Group is listed on Euronext Brussels and is part of the Next 150 and BEL Mid indices. Financial News wires: Bloomberg: TESB BB - Reuters: TESB.BR - Datastream: B:Tes. For more information about Tessenderlo Group, its people, its brands, and its results, please visit www.tessenderlo.com.

CFO – Investor Relations

Miguel de Potter +32 2 887 09 58 ir@tessenderlo.com

This press release is available in Dutch and English on the website www.tessenderlo.com.