Mersen : Changes to Mersen's Board of Directors

PRESS RELEASE

After 21 years as a member of Mersen's Board of Directors1, first as a director and later as Chairman, Hervé Couffin has decided not to stand for re-election at the Annual General Meeting of May 18, 2017.

The Board of Directors would particularly like to thank Hervé Couffin for contributing so significantly to Mersen's development, as a director and then as Chairman of the Board.

Hervé Couffin commented: "It has been a pleasure to accompany Mersen over the past couple of decades, a period during which the Group has strengthened its global leadership positions in its main businesses, in terms of both technology and sales. As I say goodbye to the Board, I'm happy to see that the Group is on the verge of returning to growth both in sales and in margins."

In addition, Jean-Paul Jacamon, who has been a member of the Board of Directors1 for 14 years, has decided to resign from his position as a director for personal reasons, effective May 18, 2017. The Board of Directors thanks Jean-Paul Jacamon for his constantly insightful input over the years.

Shareholders at the Annual General Meeting will be asked to approve the appointment to the Board of Directors, for four-year terms, of Olivier Legrain and Michel Crochon to replace Hervé Couffin and Jean-Paul Jacamon, and to renew the terms as directors of Carolle Foissaud, Ulrike Steinhorst, Yann Chareton and Dominique Gaillard.

Subject to shareholders' approval of the proposed appointments, and following an in-depth process led by the Governance and Remuneration Committee, the Board of Directors will formally appoint Olivier Legrain as its Chairman at the close of the Annual General Meeting.

Furthermore, Fonds Nobel, a director of the Company, has informed the Board of Directors that, effective April 10, 2017, its permanent representative will be Bénédicte Levinson, who replaces Philippe de Verdalle.

1 Supervisory Board from 2009 to 2016

PAGE 1 OF 2

PRESS RELEASE

Michel Crochon, 65, has spent the majority of his career at Schneider Electric, where he held various industrial, commercial and development-related positions, in Europe and Asia. During his 12 years as a member of the group's executive committee, he headed up several business units. In his most recent position, he was in charge of corporate strategy and technology.

Olivier Legrain, 65, began his career with Rhône-Poulenc, where he held executive positions in various business units. He then joined Lafarge as a member of its executive committee, in charge of specialty materials and strategy. He later became Chairman of Materis, after organizing its exit from the Lafarge group.

Bénédicte Levinson began her career at 3M, before joining Air Liquide where she has held management positions in marketing and operations, in France and Europe. She is currently Air Liquide's VP, Industrial Merchant for Southern Europe.

Global expert in electrical power and advanced materials, Mersen designs innovative solutions to address its clients' specific needs to enable them to optimize their manufacturing performance in sectors such as energy, electronics, transportation, chemicals & pharmaceuticals and process industries.

Mersen, with its 6,100 employees working across 35 countries, recorded sales of 764 million euros in 2016.

PAGE 2 OF 2