Rockwool

Share Issue/Capital Change • May 2, 2025

Company announcement for ROCKWOOL A/S Release no. 27 – 2025 to Nasdaq Copenhagen

2 May 2025

Reduction of the share capital

At the Annual General Meeting of ROCKWOOL A/S (the "Company") held on 2 April 2025, it was resolved to reduce the Company's B share capital from nominally 118,028,700 DKK to nominally 113,427,400 DKK by cancelling a portion of the Company's treasury B shares, corresponding to nominally 4,601,300 DKK.

The Company has today completed the capital reduction and registered it with the Danish Business Authority, thus cancelling 4,601,300 B shares of 1 DKK each, corresponding to a total nominal value of 4,601,300 DKK.

Following the reduction, the Company's total share capital amounts to nominally 211,605,790 DKK, divided into a class A share capital of nominally 98,178,390 DKK and a class B share capital of nominally 113,427,400 DKK.

The capital reduction does not affect the Company's share buy-back programme, which continues unchanged as previously announced.

Further information: Kim Junge Andersen Senior Vice President, CFO ROCKWOOL A/S +45 46 55 80 15

ROCKWOOL A/S Hovedgaden 584, DK-2640 Hedehusene, Denmark T (+45) 46 56 03 00 E info@rockwool.com