During the period from 15 July to 23 July 2026, Castellum AB (LEI code: 549300GU5OHTR1T5IY68) (“Castellum”) repurchased a total of 5,720,885 own shares (ISIN: SE0000379190) under the two parallel share repurchase programmes initiated by Castellum’s Board of Directors and announced on 15 July 2026.

Repurchases of own shares under the first share repurchase programme (“Programme 1”) are carried out in accordance with the Nasdaq Nordic Main Market Rulebook for Issuers of Shares. Repurchases of own shares under the second share repurchase programme (“Programme 2”) are carried out in accordance with the EU Market Abuse Regulation (EU) No 596/2014 (“MAR”) and Commission Delegated Regulation (EU) 2016/1052 (the “Safe Harbour Regulation”).

The purpose of the share repurchase programmes is to adjust the company’s capital structure and thereby efficiently contribute to increased shareholder value.

Shares in Castellum have been repurchased as follows:

DateAggregated volume (number of shares)of which block transactions under Programme 1Weighted average price (SEK)Total transaction value (SEK)15 July 20261,132,009982,009129.5559146,658,41716 July 2026250,0000129.421232,355,30017 July 20261,903,6271,793,627130.4693248,364,82820 July 2026461,158261,158130.079359,987,12421 July 2026676,752476,752129.029187,320,71522 July 2026575,000375,000130.447375,007,19023 July 2026722,339522,339130.313094,130,167Total5,720,8854,410,885130.0190743,823,742

All repurchases were carried out on Nasdaq Stockholm by Carnegie Investment Bank AB (publ) on behalf of Castellum. Following the repurchases described above, Castellum’s holding of own shares amounts to 30,164,885 shares as of 23 July 2026. The total number of shares in Castellum is 477,526,355.

Complete information on the transactions carried out pursuant to Article 5.3 of MAR and Article 2.3 of the Safe Harbour Regulation is attached to this press release.

For further information, please contact:Christoffer Strömbäck, CFO, Castellum AB, +46 70 249 72 55

About CastellumCastellum is a Swedish property company that owns, manages, and develops commercial properties in growth cities. As of 30 June 2026, the property value amounted to approximately SEK 134 Bn. The company is listed on Nasdaq Stockholm Large Cap and is classified as green under the Green Equity Designation. Castellum is the only Swedish property company included in the Dow Jones Sustainability Indices (DJSI). Beyond expectations.www.castellum.com

AttachmentsAppendix ENGRepurchase of shares in Castellum 15–23 July 2026