Mersen — Regulatory Filings 2012

May 3, 2012

Paris, May 3, 2012

Mersen has once again obtained a contract with the operator of the London underground in time for the 2012 Olympic Games

Mersen has just renewed a major maintenance contract with London Underground. The contract involves maintenance work to rectify commutators on underground train engines, without disassembly and within a short turnaround period. In the months ahead, 24 engines per week will undergo maintenance.

Mersen has developed expertise which reduces the downtime of rolling stock. This expertise proved decisive: with 400km of track and 270 stations in London to manage, London Underground must accelerate the pace of engine overhaul while conducting its maintenance operations solely during the night shift, in order to ensure irreproachable service during the Olympic Games which will run from 27 July to 12 August.

This contract fits within the group's strategy of developing services for electrical engines and power generators – a strategy that Mersen has already rolled out successfully in the wind power industry in North America. Thanks to this approach, Mersen is able to highlight its expertise to its customers and to offer a comprehensive range of products.

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Paris, May 3, 2012

About Mersen

Global expert in materials and solutions for extreme environments as well as in the safety and reliability of electrical equipment, Mersen designs innovative solutions to address its clients' specific needs to enable them to optimize their manufacturing process in sectors such as energy, transportation, electronics, chemical, pharmaceutical and process industries.

The Group is listed on NYSE Euronext Paris – Compartment B Visit our website www.mersen.com

Analyst and Investor Contact Press Contact

Véronique Boca Vilizara Lazarova VP Financial Communication Mersen Publicis Consultants Tel: + 33 (0)1 46 91 54 40 Tel: +33 (0)1 44 82 46 34

Email: dri@mersen.com Email: vilizara.lazarova@consultants.publicis.fr