Mersen

ISS • Dec 1, 2025

PRESS RELEASE

MERSEN SELECTED BY THE U.S. DEFENSE LOGISTICS AGENCY TO SUPPLY ISOSTATIC GRAPHITE

PARIS, DECEMBER 1 ST , 2025 – Mersen (Euronext FR0000039620 – MRN), a global expert in electrical power and advanced materials, has been selected by the Defense Logistics Agency (DLA) of the United States of America to provide isostatic synthetic graphite.

This three-year contract, worth approximately \$10 million, demonstrates Mersen's advanced capabilities in the production of synthetic graphite, which is critical to high-performance defense applications and appears in the DLA's "Materials of Interest" list. It also validates Mersen's commitment to a localized presence as a key pillar of its growth strategy, enabling the company to capture opportunities and serve customers more effectively.

Matthieu Elriz, VP Graphite Material Technologies at Mersen, said: "We are proud to have won this competitive bid to support the U.S. DLA. Being selected by the DLA reflects Mersen's strong U.S. manufacturing footprint and its capacity to deliver advanced materials for even the most demanding applications – both today and in future. We look forward to working with our U.S. teams and partners to execute this program to the highest standards."

Isostatic synthetic graphite is a high-density, precision-engineered material used in demanding environments such as aerospace, defense, and semiconductor manufacturing. The material's uniformity, purity, and strength make it ideal for applications requiring exceptional thermal and mechanical stability. Mersen is the largest isostatic graphite manufacturer in the United States, with production capacity in St Marys, PA and Columbia, TN.

PRESS RELEASE

ABOUT MERSEN

Mersen is a global expert in electrical power and advanced materials for high-tech industries. With more than 50 industrial sites and 21 R&D centers in 33 countries around the world, Mersen develops custombuilt solutions and delivers key products for clients in order to meet the new technological challenges shaping tomorrow's world. For over 130 years, Mersen's teams have focused tirelessly on innovation to accompany its clients and meet their needs. Be it in solar power, electronics, electric vehicles, aerospace or other sectors, wherever technology is progressing, you will always find a bit of Mersen. We work to constantly contribute to progress, striving daily to improve people's lives and protect the planet. This corporate commitment has been recognized by external rating agencies, EcoVadis (Silver Medal) and MSCI (A rating).

MERSEN IS PART OF THE SBF 120 INDEX (EURONEXT PARIS – COMPARTMENT B)

INVESTOR AND ANALYST CONTACT MEDIA CONTACT Mersen Brunswick

Véronique Boca Guillaume Maujean/Stephan Bürklin

Tel.: +33 (0)1 46 91 54 40 Tel.: +33 (0)6 33 06 55 93

Email: dri@mersen.com Email: mersen@brunswickgroup.com