Kemira Oyj, Stock Exchange Release, October 1, 2025, at 07:00 p.m. EEST Kemira Oyj: Acquisition of own shares on 1 October 2025 Date 1 October 2025 Exchange transaction Buy Share trading code KEMIRA Amount, shares 46,206 Average price/share (EUR) 19.2701 Total cost (EUR) 890,394.24 After the acquisitions Kemira Oyj holds a total of 3,056,762 treasury shares. On behalf of Kemira Oyj Danske Bank A/S, Finland Branch Antti Väliaho Jonathan Nyberg For more information, please contact: Kemira Oyj Kiira Fröberg, Vice President, Investor Relations Tel. +358 40 760 4258 kiira.froberg@kemira.com Kemira is a global leader in sustainable chemical solutions for water-intensive industries. We deliver tailored products and services to improve the product quality, processes, and resource efficiency of our diverse range of customers. Our focus is on water treatment, as well as on fiber and renewable solutions - enabling sustainability transformation for our customers. In 2024, Kemira reported annual revenue of EUR 2.9 billion with a global team of some 4,700 colleagues. Kemira is listed on the Nasdaq Helsinki www.kemira.com