On 20 February 2026 it was announced that the Board of Directors of Castellum AB (“Castellum”) had resolved to initiate share buy-backs of a purchase amount of up to SEK 3.4 billion. The Board of Directors of Castellum has now resolved to end the share buy-back program.

During the period 20 February to 24 March 2026 Castellum has acquired 15,075,097 own shares for a total consideration of SEK 1.7 billion, equivalent to an average share price of SEK 112.02 per share.

The Board of Directors of Castellum has today, through utilization of the authorization granted by Castellum’s Annual General Meeting held on 7 May 2025, resolved to initiate a new share buy-back program.

Acquisitions of shares pursuant to the new share buy-back program will be carried out in accordance with the EU Market Abuse Regulation (EU) No 596/2014 ("MAR") and the Commission Delegated Regulation (EU) 2016/1052 (the "Safe Harbour Regulation"). Acquisitions of shares will be managed by ABG Sundal Collier, that will make its trading decisions regarding the timing of the acquisitions of Castellum's shares independently of Castellum.

The share buy-back program is subject to the following terms:

1. Acquisitions may be carried out only to the extent that Castellum, after each acquisition, will hold a maximum of ten per cent (10%) of all shares issued by the company. The maximum purchase amount is SEK 1.7 billion.
2. Acquisitions shall be made on Nasdaq Stockholm in accordance with Nasdaq Nordic Main Market Rulebook, MAR and the Safe Harbour Regulation.
3. The shares shall be acquired at a price per share within the registered price level on Nasdaq Stockholm at the time of the acquisition, which refers to the level between the highest current purchase price and the lowest selling price published on a regular basis by Nasdaq Stockholm, and acquisitions shall otherwise be conducted in accordance with the rules regarding the price for repurchase of own shares set out in Nasdaq Nordic Main Market Rulebook.
4. Acquisition of shares may be carried out on one or several occasions during the period until Castellum's Annual General Meeting 2026.
5. Payment of the shares shall be made in cash.

The purpose of acquiring own shares is to adjust the company’s capital structure, thereby efficiently contributing to an increase in shareholder value.

ABG Sundal Collier has been appointed as Castellum’s advisor in relation to the repurchases of shares.

At the time of this press release, the total number of issued shares in Castellum amounted to 492,601,452 and Castellum held 15,574,500 own shares.

For further information, please contact:
Pål Ahlsén, Chief Executive Officer, Castellum AB, +46 76 807 97 02
Christoffer Strömbäck, Acting CFO and Acting Head of Transactions, Castellum AB, +46 70 249 72 55