Rockwool

Transaction in Own Shares • Sep 24, 2025

Company announcement for ROCKWOOL A/S Release no. 57 – 2025 to Nasdaq Copenhagen

24 September 2025

ROCKWOOL A/S – transactions in connection with share buy-back programme

As mentioned in announcement no. 07/2025, ROCKWOOL A/S has initiated a share buy-back programme which will run from 7 February 2025 until 5 February 2026. During this period, the Company will buy own shares for up to a maximum of 150 MEUR.

The programme is implemented in accordance with EU Commission Regulation No 596/2014 of 16 April 2014 and EU Commission Delegated Regulation No 2016/1052 of 8 March 2016, which together constitute the "Safe Harbour" regulation.

The following transactions have been executed during the period 17 – 23 September 2025:

Date	Number of B shares	Average purchase price B shares (DKK)	Aggregate amount, B shares (DKK)
[Accumulated, last announcement]	2,717,500		755,734,126
17 September 2025	20,000	237.48	4,749,600
18 September 2025	20,000	238.77	4,775,400
19 September 2025	20,000	237.41	4,748,200
22 September 2025	24,000	233.52	5,604,480
23 September 2025	20,000	239.29	4,785,800
Accumulated under the programme (B shares)	2,821,500		780,397,606

With the transactions stated above, ROCKWOOL A/S owns 3,268,356 B shares corresponding to 1.54 percent of the Company's total share capital.

An overview showing the transaction data for the period 17 – 23 September 2025 is enclosed.

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