PRESS RELEASE

PARIS, April 10, 2026

Imerys signs agreement to acquire Great Lakes Minerals

Imerys announces today that it has entered into a binding agreement to acquire the business of Great Lakes Minerals, a leading United States-based processor and distributor of minerals for the refractory and abrasive industry.

This acquisition will strengthen Imerys' Solutions for Refractory, Abrasives and Construction portfolio with critical materials, including calcined bauxite, mullite and fused alumina, while positioning the Group as a key supplier to customers across North America. The transaction also expands Imerys' geographical footprint with strategically located industrial assets on the Ohio River in Kentucky, allowing the Group to leverage direct barge-to-plant feedstock handling capabilities.

Imerys expects the business to reach revenue of $80 million per year post integration, and to benefit from the ongoing reshoring of industrial activities to the USA.

The transaction is subject to customary closing conditions and is expected to be completed in the first half of 2026.

Imerys is the world’s leading supplier of mineral-based specialty solutions for the industry with €3.4 billion in revenue and 12,300 employees in 40 countries in 2025. The Group offers high value-added and functional solutions to a wide range of industries and fast-growing markets such as solutions for the energy transition and sustainable construction, as well as natural solutions for consumer goods. Imerys draws on its understanding of applications, technological knowledge, and expertise in material science to deliver solutions which contribute essential properties to customers’ products and their performance. As part of its commitment to responsible development, Imerys promotes environmentally friendly products and processes in addition to supporting its customers in their decarbonization efforts. Imerys is listed on Euronext Paris (France) with the ticker symbol NK.PA.

More comprehensive information about Imerys may be obtained from its website (www.imerys.com) in the Regulated Information section, particularly in its Registration Document filed with the French financial markets authority (Autorité des marchés financiers, AMF) on March 19, 2026 under number D.26-0117 (also available from the AMF website, www.amf-france.org). Imerys draws investors’ attention to chapter 2 “Risk Factors and Internal Control” of its Registration Document.

Analyst/Investor Relations:

Cyrille Arhanchiague : +33 (0)6 07 16 67 26
finance@imerys.com

Press contacts:

Mathieu Gratiot : +33 (0)7 87 53 46 60
Hugues Schmitt (Primatice) : + 33 (0)6 71 99 74 58
Olivier Labesse (Primatice) : + 33 (0)6 79 11 49 71