PRESS RELEASE

MERSEN JOINS THE SBF 120 INDEX

PARIS, JUNE 11, 2026 – Mersen (Euronext FR0000039620 - MRN), a global expert in electrical power and advanced materials, today announced its inclusion in the SBF 120 index following the quarterly review of Euronext Paris indices. This decision will take effect on June 19, 2026, after market closing.

The SBF 120 includes the companies listed in the CAC 40, as well as 80 other stocks that are among the most representative of the French equity market in terms of liquidity and market capitalization.

This inclusion strengthens the Group’s market visibility among investors and financial markets.

Mersen continues to implement its growth plan, with the aim of strengthening the Group’s position in its strategic markets.

ABOUT MERSEN

Mersen is a global industrial group which designs and deploys the technologies at the heart of today's major energy and industrial transitions.

A recognized expert in electrical power and advanced materials, Mersen enables the performance and reliability of industrial systems and essential infrastructure across a range of areas, from power management and electric vehicles to renewable energies and storage, aerospace and rail.

With more than 50 industrial sites in 30 countries, the Group combines local agility with the strength of a global organization to develop and industrialize tailored engineering solutions at scale. Backed by 24 R&D centers worldwide, Mersen partners closely with its customers, providing the best added value whilst accelerating innovation and shortening time-to-market, delivering pragmatic solutions by combining speed and reliability. Rooted in a 130-year heritage and guided by a long-term industrial vision, the Group pursues sustainable growth based on responsible practices, while playing a key role in electrification, the climate transition and the resilience of industrial and energy systems.