Rockwool

Transaction in Own Shares • Nov 5, 2025

Company announcement for ROCKWOOL A/S Release no. 63 – 2025 to Nasdaq Copenhagen

5 November 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 29 October – 4 November 2025:

Date	Number of B shares	Average purchase price B shares (DKK)	Aggregate amount, B shares (DKK)
[Accumulated, last announcement]	3,317,500		896,823,406
29 October 2025	18,000	230.17	4,143,060
30 October 2025	20,000	226.94	4,538,800
31 October 2025	22,000	223.16	4,909,520
3 November 2025	22,000	221.64	4,876,080
4 November 2025	22,000	220.44	4,849,680
Accumulated under the programme (B shares)	3,421,500		920,140,546

With the transactions stated above, ROCKWOOL A/S owns 3,868,356 B shares corresponding to 1.83 percent of the Company's total share capital.

An overview showing the transaction data for the period 29 October – 4 November 2025 is enclosed.

Further information: Kim Junge Andersen

Senior Vice President, CFO ROCKWOOL A/S

+45 46 55 80 15