Castellum publishes prospectus

This press release may not be announced, published or distributed, in whole or
in part, directly or indirectly, in the United States, Canada, Japan, Australia,
Hong Kong, New Zealand, Singapore, South Africa or any other country where such
publication or distribution would violate applicable laws or rules or would
require additional documents to be prepared or registered or require any other
actions to be taken, in addition to the requirements under Swedish law. This
press release is not a prospectus. For further information, please refer to
“Important notice” in this press release.

N.B. This press release has been published in Swedish and English. In the event
of any discrepancy between these two versions, the Swedish version shall
prevail.

Castellum AB (publ) announced on 13 April, 2016, that the Board of Directors had
resolved to, subject to the approval by the Extraordinary General Meeting,
launch a fully underwritten rights issue with preferential rights for
Castellum’s shareholders (the “Rights issue”) in order to finance part of the
acquisition of all shares in Norrporten AB (publ). The Rights issue was approved
by the Extraordinary General Meeting on 20 May, 2016. The prospectus has today
been approved and registered by the Swedish Financial Supervisory Authority and
is now available on Castellum’s website: www.castellum.se.
The prospectus and the application form can be obtained from Castellum and
Carnegie Investment Bank AB (publ). The prospectus and the application form will
also be available on Castellum’s website (www.castellum.se) as well as Carnegie
Investment Bank AB’s (publ) website (www.carnegie.se).

FINANCIAL AND LEGALA ADVISORS IN RELATION TO THE RIGHTS ISSUE

Carnegie Investment Bank AB (publ), Handelsbanken Capital Markets, HSBC Bank
plc, Skandinaviska Enskilda Banken AB (publ), and Swedbank AB (publ) are Joint
Global Coordinators and Joint Bookrunners in relation to the Rights issue.
Gernandt & Danielsson Advokatbyrå KB is legal advisor to Castellum and
Linklaters is legal advisor to Joint Global Coordinators and Joint Bookrunners.

For additional information, please contact:
Henrik Saxborn, CEO, Tel +46-31-60 74 50
Ulrika Danielsson, CFO, Tel +46-31-60 74 74

www.castellum.se

Castellum AB (publ) publishes this information in compliance with the Swedish
Securities Market Act and/or the Swedish Act on Trading in Financial
Instruments. This information was announced on May 25, 2016, at 6.45 pm (CET).

Castellum is one of the major listed real estate companies in Sweden. The fair
value of the real estate portfolio, prior to the contemplated acquisition of
Norrporten, amounts to approx. SEK 45 billion, and comprises premises for
office, retail, warehouse and industrial purposes with a total lettable area of
approx. 3.6 million sq.m. After the acquisition of Norrporten, Castellum’s real
estate portfolio will increase by 60 percent to SEK 71 billion, as per pro forma
March 31, 2016.

After acquiring Norrporten, Castellum will own and manage properties through one
common brand in five geographical regions with strong local presence. The five
geographical regions are: West, Öresund, Stockholm, North and Central.

In 2015, Castellum sustainability performance was awarded two top distinctions:
the World Green Building Council’s award Business Leadership in Sustainability
and “Green Star 2015” by GRESB. This means that Castellum is one of the highest
ranking companies in the world in the real estate sector.

The Castellum share is listed on Nasdaq Stockholm Large Cap.

Castellum AB (publ), Box 2269, SE-403 14 Gothenburg | Org nr/Corp Id no SE
556475-5550 | Phone +46 31 60 74 00 Fax +46 31 13 17 55

IMPORTANT INFORMATION

This press release does not contain or constitute an invitation or an offer to
acquire, sell, subscribe for or otherwise trade in shares, subscription rights
or other securities in Castellum. Invitation to the persons concerned to
subscribe for shares in Castellum will only be made through the prospectus
referred to in this press release. The prospectus contains, among other things,
risk factors, financial statements as well as information regarding the
company’s board of directors. This press release has not been approved by any
regulatory authority and is not a prospectus and accordingly, investors should
not subscribe for or purchase any securities referred to in this press release
except on the basis of information provided in the prospectus referred to in
this press release.

In certain jurisdictions, the publication or distribution of this press release
may be subject to restrictions according to law and persons in those
jurisdictions where this press release has been published or distributed should
inform themselves about and abide by such restrictions.

This press release is not directed to persons located in Canada, Japan,
Australia, Hong Kong, New Zealand, Singapore, South Africa or in any other
country where the offer or sale of the subscription rights, paid subscribed
shares (Sw. betalda tecknade aktier) or new shares is not permitted. In the
United States (including its territories and possessions, any state of the
United States and the District of Columbia) any offering will only be of
subscription rights and paid subscribed shares (Sw. betalda tecknade aktier)
made by the Company to a limited number of existing shareholders who are
reasonably believed to be qualified institutional buyers (as defined in Rule
144a under the US Securities Act of 1933, as amended (the “Securities Act”)
pursuant to an exemption from registration under the Securities Act in a
transaction not involving any public offering and who have executed and returned
an investor letter to the Company. This press release may not be announced,
published or distributed, directly or indirectly, in or into Canada, Japan,
Australia, Hong Kong, New Zealand, Singapore, South Africa or any other country
where such action is wholly or partially subject to legal restrictions or where
such action would require additional prospectuses, other offer documentation,
registrations or other actions in addition to what follows from Swedish law. The
information in this press release may not be forwarded, reproduced or disclosed
in such a manner that would contravene such restrictions or would require such
additional prospectuses, other offer documentation, registrations or other
actions. Failure to comply with this instruction may result in a violation of
the Securities Act or laws applicable in other jurisdictions.

No subscription rights, paid subscribed shares or new shares have been or will
be registered under the Securities Act, or with any other securities regulatory
authority of any state or other jurisdiction of the United States and no
subscription rights, paid subscribed shares or new shares may be offered, sold,
resold, transferred, delivered or distributed, directly or indirectly, into or
within the United States other than pursuant to an exemption from, or in a
transaction not subject to the registration requirements of the Securities Act,
and in compliance with any applicable securities laws of any state or
jurisdiction of the United States. No public offering of subscription rights,
paid subscribed shares or new shares is made in the United States. There is no
intention to register any securities referred to herein in the United States or
to make a public offering in the United States.

This press release contains forward-looking statements which reflect Castellum’s
current view on future events and financial and operational development. Words
such as “intend”, “will”, “expect”, “anticipate”, “may”, “plan”, “estimate” and
other expressions than historical facts which imply indications or predictions
of future development or trends, constitute forward-looking statements. Forward
-looking statements inherently involve both known and unknown risks and
uncertainties as they depend on future events and circumstances. Forward-looking
statements do not guarantee future results or development and the actual outcome
could differ materially from the forward-looking statements.

The information, opinions and forward-looking statements concluded in this
announcement speak only as of its date and are subject to change without notice.