Castellum stock steadies as rental income and net operating income shape the case

Castellum stock (SE0021921319) is framed by 2025 full-year numbers: rental income was SEK 8.3 billion, net operating income reached SEK 5.8 billion, and profit from property management was SEK 2.5 billion. Those figures give the Swedish commercial property group a concrete base for investors assessing the shares in late July 2026.

2025 numbers set the tone

In the 2025 annual report, Castellum said income from property management rose to SEK 2.5 billion, while net debt was reduced in line with a loan-to-value ratio of 42.9% at year-end. The same report showed property value in the portfolio at SEK 149.5 billion and economic occupancy at 93.9%, which helps explain why balance-sheet progress matters as much as earnings growth.

The comparison that stands out is leverage: the 42.9% loan-to-value ratio at 31 December 2025 is lower than the levels that often pressure Nordic real-estate valuations, and the report also showed an interest coverage ratio of 2.7 times. For a property company, that combination usually matters more than a single quarter of revenue momentum.

Income and occupancy

Rental income of SEK 8.3 billion in 2025 and net operating income of SEK 5.8 billion imply a net operating margin of about 69.9% for the year, a useful indicator in a capital-intensive sector. Economic occupancy of 93.9% added another sign that the portfolio remained well let across its core markets.

Castellum also said it held 738 properties as of year-end 2025, giving scale to the income base behind the reported numbers. That property count matters because even modest changes in occupancy, financing cost, or like-for-like rent can move cash generation across a large portfolio.

Balance sheet matters

The 2025 figures also showed a reported earnings profile that is sensitive to financing conditions, because Castellum operates in a sector where interest expense can quickly eat into distributable cash flow. An interest coverage ratio of 2.7 times leaves less room than the operating margin might suggest, even if occupancy stays above 90%.

That is why the market tends to focus on property values, leverage, and financing costs together instead of treating rental income alone as the main signal. In Castellum's case, the 2025 portfolio value of SEK 149.5 billion and the 42.9% loan-to-value ratio are the two numbers that do most of the explanatory work.

Property portfolio scale

Castellum's portfolio spans office, logistics, and public-sector properties, and the 738-property base at year-end 2025 shows how diversified cash generation is built. In a company with that many assets, small changes in occupancy and rent collection can compound across the group.

The representative product is not a single consumer item but the property portfolio itself, which is the revenue engine behind the 2025 rental income and net operating income figures. For investors, the practical question is whether the cash-flow profile can keep supporting the balance sheet while rates and property valuations remain central to valuation.

Shares in 2026

As a dated market reference for 25 July 2026, Castellum stock trades on Nasdaq Stockholm under the ticker CAST, and the shares are being assessed against the 2025 operating and leverage data. The latest reported figures remain the most concrete anchors for valuation until the next update from the company.