Castellum

Castellum is one of the largest listed real estate companies in Sweden. Property values amount to SEK 89.2 billion and holdings comprise office, warehousing/ logistics and public sector properties, covering a total leasable area of 4.2 million square metres. The real estate portfolio is owned and managed under the Castellum brand through a decentralized organization with strong and clear local presence in 20 cities in Sweden and also in Copenhagen and Helsinki. It received two awards for sustainability efforts; designated Number One in the world by GRESB for the offices-and-logistics sector, as well as the Level Gold award for sustainability reporting from the EPRA (European Public Real Estate Association) in 2018. Moreover, Castellum is the only Nordic real-estate and construction company elected to the Dow Jones Sustainability Index (DJSI), joining a select group of companies in the world who perform best on sustainability issues. The Castellum share is listed on Nasdaq Stockholm Large Cap.

Rutger Arnhult

CEO

3 past transactions

Entra

Post in 2025
Entra is a prominent real estate company based in Norway, specializing in the ownership, development, and management of office properties. The company's portfolio is predominantly concentrated in Oslo and its surrounding areas, including Bergen, Stavanger, Drammen, and Trondheim. Entra's properties are known for their environmental standards and flexibility, catering primarily to the public sector, which constitutes the majority of its tenants. Rental income is the primary source of the company's operating revenue, supplemented by property appreciation and sales. Notably, properties located in Oslo represent over half of Entra's total portfolio value and are a significant contributor to its rental income.

Specialty Systems

Acquisition in 2021
SSI is an Information Systems and Engineering Services consulting firm that specializes in the delivery of technical services and customized software solutions for customers in both the private and federal/state/local government markets.

MFSI Government Group

Acquisition in 2021
MFSI Government Group specializes in delivering mission-critical support solutions for national security and the armed forces. The company offers engineering and analysis services tailored to the needs of U.S. federal agencies, focusing on the review and analysis of project requirements, functions, and elements related to defense and security initiatives. Through its expertise, MFSI Government Group plays a vital role in enhancing the capabilities and effectiveness of the military and government operations.
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