Rockwool

Transaction in Own Shares • Sep 3, 2025

Company announcement for ROCKWOOL A/S Release no. 53 – 2025 to Nasdaq Copenhagen

3 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 27 August – 2 September 2025:

Date	Number of B shares	Average purchase price B shares (DKK)	Aggregate amount, B shares (DKK)
[Accumulated, last	2,330,500		661,881,746
announcement]
27 August 2025	32,000	241.79	7,737,280
28 August 2025	28,000	247.97	6,943,160
29 August 2025	26,000	243.02	6,318,520
1 September 2025	26,000	244.31	6,352,060
2 September 2025	28,000	241.07	6,749,960
Accumulated under the programme (B shares)	2,470,500		695,982,726

With the transactions stated above, ROCKWOOL A/S owns 2,917,356 B shares corresponding to 1.38 percent of the Company's total share capital.

An overview showing the transaction data for the period 27 August – 2 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