Shareholders may choose to exercise their voting rights at the Extraordinary General Meeting by attending in person or through a proxy. No beverages or food will be served at the meeting.

Notification etc.
A person who wishes to attend the meeting venue in person or by proxy must

• be registered as a shareholder in the share register kept by Euroclear Sweden AB by Thursday, 10 July 2025; and

• give notice of participation in the Extraordinary General Meeting no later than Monday, 14 July 2025 (preferably before 4 p.m. CEST). Notification of participation at the Extraordinary General Meeting can be made by post to Castellum Aktiebolag, c/o Euroclear Sweden AB, Box 191, SE-101 23 Stockholm, by phone at +46 8–401 43 76, or through Euroclear Sweden AB’s website, https://anmalan.vpc.se/EuroclearProxy/.The notification must state name/business name, social security number/corporate identification number, address and telephone number.

For those who wish to be represented by a proxy, a written and dated power of attorney signed by the shareholder must be attached to the notification and presented at the meeting. A form of proxy is available on Castellum’s website, www.castellum.com. If the shareholder is a legal person, a copy of the registration certificate, or if such document does not exist, other corresponding authorisation documentation must be attached.

Nominee-registered shares
In order to be entitled to participate in the Extraordinary General Meeting, a shareholder whose shares are registered in the name of a nominee must, in addition to giving notice of participation, register its shares in its own name so that it is registered as a shareholder in the share register kept by Euroclear Sweden AB by Thursday, 10 July 2025. Such registration may be temporary (so-called voting rights registration), and request for such voting rights registration shall be made to the nominee, in accordance with the nominee’s routines, at such a time as decided by the nominee. Voting rights registrations that have been made no later Monday, 14 July 2025 will be taken into account in the presentation of the share register.

Right for shareholders to receive information
Shareholders are reminded of their right to receive information from the Board of Directors and the CEO at the Extraordinary General Meeting in accordance with Chapter 7, Section 32 of the Swedish Companies Act in respect of information regarding circumstances that may affect the assessment of an item on the agenda. The Board of Directors and the CEO shall provide such information at the Extraordinary General Meeting, provided that they consider that it may be done without significant harm to Castellum. Shareholders wishing to submit questions in advance may do so by sending an email to info@castellum.se.

Items
1. Opening of the meeting and election of the Chair of the meeting.

2. Preparation and approval of the voting list.

3. Approval of the agenda.

4. Election of one or two persons to verify the minutes.

5. Determination of whether the Extraordinary General Meeting has been duly convened.

6. Determination of the number of members of the Board of Directors.

7. Resolution regarding the remuneration to be paid to the members of the Board of Directors.

8. Election of new members of the Board of Directors and the Chair of the Board of Directors.

9. Closing of the Extraordinary General Meeting.

Resolution proposed by the Board of Directors
Item 1 – Election of the Chair of the Extraordinary General Meeting.

The Board of Directors proposes the attorney Wilhelm Lüning to preside as Chair of the Extraordinary General Meeting.

Other information

Number of shares and votes
At the date of this notice, there are in total 492,601,452 shares and votes in the Company. The Company holds 499,403 own shares.

Documentation
The notice to the Extraordinary General Meeting can be found on the Company’s website, www.castellum.com.

The notice will be sent to shareholders, who have stated their postal address, upon request.

Processing of personal data
For information on how your personal data is processed, see
https://www.euroclear.com/dam/ESw/Legal/ES_PUA_Privacy_notice_bolagsstammor.pdf.

Gothenburg in June 2025
CASTELLUM AKTIEBOLAG
The Board of Directors