Rockwool

Transaction in Own Shares • Oct 22, 2025

Company announcement for ROCKWOOL A/S Release no. 61 – 2025 to Nasdaq Copenhagen

22 October 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 15 – 21 October 2025:

Date	Number of B shares	Average purchase price B shares (DKK)	Aggregate amount, B shares (DKK)
[Accumulated, last announcement]	3,131,500		853,443,366
15 October 2025	20,000	232.93	4,658,600
16 October 2025	20,000	233.12	4,662,400
17 October 2025	20,000	232.01	4,640,200
20 October 2025	18,000	235.55	4,239,900
21 October 2025	18,000	233.81	4,208,580
Accumulated under the programme (B shares)	3,227,500		875,853,046

With the transactions stated above, ROCKWOOL A/S owns 3,674,356 B shares corresponding to 1.74 percent of the Company's total share capital.

An overview showing the transaction data for the period 15 – 21 October 2025 is enclosed.

Further information: Kim Junge Andersen

Senior Vice President, CFO ROCKWOOL A/S

+45 46 55 80 15