Overview
Castellum AB is a commercial property owner, investor and developer. Its business focuses on investing in and developing commercial premises, with a stated mission of “Creating workplaces where people and enterprises thrive.” [1][2] Its portfolio is principally in Sweden’s growth cities, with properties also in Copenhagen and Helsinki and exposure to Norway through associated company Entra. The portfolio includes offices, public-sector properties, warehouses and light industrial premises, as well as retail.[3][4]
At 30 June 2026, Castellum reported 655 investment properties covering 5.156 million square metres.[5] For FY2025, rental and service income was SEK 9,593 million, and the company reported 485 employees at year-end.[6][7] [1][2][3][4][5][6][7]
Products & services
Castellum’s products are commercial spaces including offices, public-sector properties, warehouses and light-industrial and retail premises. Its logistics offer spans large central warehouses through to last-mile locations. The company also provides property management, leasing, new construction, renovation and tenant-specific adaptations.[8][9][10][11]
Services for tenants include local property-team support, service requests and fault reporting, and help with adaptations. Castellum also offers furnished serviced offices and coworking through United Spaces, alongside flexible workspace options.[12][13][14][15][16][17]
Technical and environmental features include solar PV systems and charging stations; Castellum reported installing 130 PV systems with more than 23 MW of capacity during 2020–2025 and generating 15,609 MWh from its own PV systems in 2025.[18][19] The 2025 annual report lists certifications including Miljöbyggnad, LEED, BREEAM, WELL and NollCO2; certified buildings represented 58% of total property area at year-end 2025. This is a portfolio certification measure, not a share of financial performance.[20] The reviewed reporting does not provide revenue or performance percentages by property type.[8][13] [8][9][10][11][12][13][14][15][16][17][18][19][20][10][11][14][15][16][17]
Geographic presence
Castellum’s direct property operations are concentrated in Sweden, with additional portfolios in Finland and Denmark. Its Swedish regions are Stockholm, West, Central, Mälardalen and Öresund; the company also identifies Copenhagen and Helsinki among its growth-city markets. Castellum reports Norway exposure through its associated company Entra.[3][21]
In H1 2026, property income totaled SEK 4,449 million. By reported portfolio region, income was Stockholm SEK 1,177 million (26.5%), West SEK 885 million (19.9%), Central SEK 861 million (19.4%), Mälardalen SEK 631 million (14.2%), Öresund SEK 477 million (10.7%), Finland SEK 300 million (6.7%) and Denmark SEK 118 million (2.7%). The five Swedish regions together represented about 90.6% of the total; these percentages are calculated from reported property-income figures and are not a separate breakdown of consolidated group revenue.[5]
Castellum lists head offices in Gothenburg and Stockholm, and offices in Helsinki and Copenhagen. At year-end 2025, associated company Entra’s property-management portfolio covered Oslo, Bergen/Stavanger, Sandvika and Drammen in Norway.[22][23][24][25] [3][21][5][25][22][23][24]
Business segments
Castellum reports geographic operating segments. Its six active segments in the first half of 2026 were Stockholm; West, covering Greater Gothenburg including Borås; Central, covering Örebro, Linköping, Norrköping, Jönköping and Växjö; Mälardalen, covering Uppsala and Västerås; Öresund, covering Malmö, Lund, Helsingborg and Copenhagen; and Finland. The company says its segments are largely identified by geographical area of activity.[26][27][28] Coworking was previously reported as a separate business segment, but was eliminated after the United Spaces divestment in 2025; it is not an active segment in the 2026 H1 results.[29][28]
For January–June 2026, net operating income was SEK 3,215 million in total. Approximate contributions to that total were Stockholm SEK 841 million (26.2%), West SEK 720 million (22.4%), Central SEK 614 million (19.1%), Mälardalen SEK 410 million (12.7%), Öresund SEK 465 million (14.5%), and Finland SEK 165 million (5.1%). Percentages are calculated from reported segment net operating income.[28] [26][27][29][28][28][28][28][28][28][28]
Company history
Castellum’s documented corporate history includes the formation of its A shares on 27 October 1993; the company went public in 1997, when its shares were listed on Nasdaq Stockholm.[30][31]
In 2015–2016, Castellum expanded through property acquisitions, including Henry Ståhl Fastigheter and the remaining shares in CORHEI, formerly Henry Ståhl Fastigheter.[32][33] In 2016, it also acquired Norrporten, a major portfolio expansion.[34][35]
In 2020–2021, Castellum proposed a combination with Norwegian property company Entra and later withdrew its offer; it nevertheless held 33.3% of Entra at the end of 2021.[36][37][38] In a separate major transaction, Kungsleden became a Castellum subsidiary in November 2021, and Castellum completed its acquisition of the remaining shares in 2022.[39][40] [30][38][31][32][33][34][35][36][37][39][40]
Sources
- CASTELLUM AB — Full financial report (2025 Y)
- CASTELLUM AB — Partial financial report (2026 H 1)
- www.castellum.se[10]
- www.castellum.se[11]
- www.castellum.se[14]
- www.castellum.se[15]
- www.castellum.se[16]
- www.castellum.se[17]
- www.castellum.se[22]
- castellum.fi[23]
- www.castellum.dk[24]
- CASTELLUM AB — Full financial report (2020 Y)[30]
- www.castellum.se[31]
- news.cision.com[32]
- www.castellum.se[33]
- www.castellum.se[34]
- www.castellum.se[35]
- www.castellum.se[36]
- www.castellum.se[37]
- CASTELLUM AB — Full financial report (2021 Y)[38]
- www.castellum.se[39]
- www.castellum.se[40]
Continue your research
From company context to financial detail.
Explore original sources and worldwide fundamental financial data and intelligence with Finbar.
Explore CASTELLUM AB in Finbar ↗