Rockwool

Transaction in Own Shares • May 21, 2025

Company announcement for ROCKWOOL A/S Release no. 31 – 2025 to Nasdaq Copenhagen

21 May 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 14 – 20 May 2025:

Date	Number of B shares	Average purchase price B shares (DKK)	Aggregate amount, B shares (DKK)
[Accumulated, last announcement]	1,061,500		299,481,956
14 May 2025	10,000	308.96	3,089,600
15 May 2025	10,000	306.28	3,062,800
16 May 2025	10,000	306.15	3,061,500
19 May 2025	9,000	309.24	2,783,160
20 May 2025	10,000	310.22	3,102,200
Accumulated under the programme (B shares)	1,110,500		314,581,216

With the transactions stated above, ROCKWOOL A/S owns 1,729,330 B shares corresponding to 0.82 percent of the Company's total share capital.

An overview showing the transaction data for the period 14 – 20 May 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