Castellum

The Board of Directors has decided, pursuant to Chapter 7, Section 4 a of the Swedish Companies Act (Sw. aktiebolagslagen) and the Company's Articles of Assocation, that shareholders that do not want to, or cannot, attend the Extraordinary General Meeting in person can exercise their voting rights by postal voting. Consequently, shareholders may choose to exercise their voting rights at the Extraordinary General Meeting by attending in person, through a proxy or by postal voting.

Notification etc.

A) Attending the meeting venue in person

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 Wednesday, 5 July 2023; and

• give notice of participation in the Extraordinary General Meeting no later than Friday, 7 July 2023 (preferably before 16:00 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/company registration 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 registration certificate, or if such document does not exist, other corresponding authorisation documentation must be attached.

B) Participation by postal voting

A person who wishes to participate in the Extraordinary General Meeting by postal voting must

• be registered as a shareholder in the share register kept by Euroclear Sweden AB by Wednesday, 5 July 2023; and

• give notice of participation in the Extraordinary General Meeting no later than Friday, 7 July 2023, by submitting a postal voting form in accordance with the instructions below, so that the postal vote is received by Euroclear Sweden AB no later than that day.

A person who wishes to attend the meeting venue in person or by proxy, must give notice in accordance with the instructions stated under A) above. Hence, a notice of participation only through postal voting is not sufficient for a person who wishes to attend the meeting venue.

A special form shall be used for postal voting. The form is available on the Company's website, www.castellum.com. The completed and signed form may be sent by post to Castellum Aktiebolag, ”Extraordinary General Meeting”, c/o Euroclear Sweden AB, Box 191, SE-101 23 Stockholm, or by email to GeneralMeetingService@euroclear.com (state “Castellum Aktiebolag – postal voting” in the subject line). The completed and signed form must be received by Euroclear Sweden AB no later than Friday, 7 July 2023. Shareholders may also submit the postal vote electronically by verifying with BankID via Euroclear Sweden AB's website, https://anmalan.vpc.se/EuroclearProxy/.

Shareholders may not provide specific instructions or conditions in the voting form. If so, the postal vote, in its entirety, is invalid. Further instructions and conditions are included in the form for postal voting.

If the shareholder postal votes by proxy, a written and dated power of attorney signed by the shareholder must be attached to the postal voting form. A form of proxy is available on Castellum's website, www.castellum.com. If the shareholder is a legal person, a registration certificate or other corresponding authorisation document must be attached to the form.

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 Wednesday, 5 July 2023. 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 than Friday, 7 July 2023 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 Managing Director at the Extraordinary General Meeting in respect of information regarding circumstances that may affect the assessment of an item on the agenda. The Board of Directors and the Managing Director shall provide such information at the meeting, provided that they consider that it may be done without significant harm to Castellum.

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. Determination of the remuneration to be paid to the members of the Board of Directors.

8. Election of a new Board member.

9. Closing of the Extraordinary General Meeting.

Resolutions proposed by the Board of Directors

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

The Board of Directors proposes Johan Henriks, representing Länsförsäkringar Fondförvaltning AB (publ), or to the extent he is prevented, the person appointed by the Board of Directors, as the person to verify the minutes.

Resolutions proposed by the Nomination Committee

Item 1 – Election of the Chair of the meeting.

The Nomination Committee proposes the attorney Erik Persson to preside as Chair of the Extraordinary General Meeting.

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

The Nomination Committee proposes that the Board of Directors shall consist of six Board members.

Item 7 – Determination of the remuneration to be paid to the members of the Board of Directors.

The Nomination Committee proposes that the remuneration to the Board of Directors remain in accordance with the resolution of the Annual General Meeting held on 23 March 2023.

Item 8 – Election of a new Board member.

The Nomination Committee proposes that Pål Ahlsén is elected as a new Board member until the end of the next Annual General Meeting.

Pål Ahlsén was born in 1972 and is a Swedish citizen. Since 2023, Pål Ahlsén is the Chair of the Board of Directors of Akelius Residential Property AB (publ). Pål Ahlsén has previously been the President and CEO of Akelius Residential Property AB (publ). Additionally, Pål Ahlsén has been the Head of Germany and has worked with business development at Akelius Residential Property AB (publ). Pål Ahlsén has a Master's degree in Economics from Stockholm University. Pål Ahlsén does not hold any shares in Castellum Aktiebolag.

Further information regarding the proposed Board member will be available on the Company’s website at www.castellum.com.

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. Castellum does not hold any own shares.

Documentation

The Nomination Committee's complete proposal for resolutions, information regarding the proposed Board member and its statement concerning the Nomination Committee's proposal regarding the Board member can be found on the Company's website, www.castellum.com and 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/Privacy-notice-bolagsstammor-engelska.pdf.

Gothenburg in June 2023
CASTELLUM AKTIEBOLAG
The Board of Directors