Is Castellum (STO:CAST) A Risky Investment?

The external fund manager backed by Berkshire Hathaway's Charlie Munger, Li Lu, makes no bones about it when he says 'The biggest investment risk is not the volatility of prices, but whether you will suffer a permanent loss of capital.' So it might be obvious that you need to consider debt, when you think about how risky any given stock is, because too much debt can sink a company. Importantly, Castellum AB (publ) (STO:CAST) does carry debt. But should shareholders be worried about its use of debt?

When Is Debt A Problem?

Debt assists a business until the business has trouble paying it off, either with new capital or with free cash flow. In the worst case scenario, a company can go bankrupt if it cannot pay its creditors. However, a more common (but still painful) scenario is that it has to raise new equity capital at a low price, thus permanently diluting shareholders. Of course, the upside of debt is that it often represents cheap capital, especially when it replaces dilution in a company with the ability to reinvest at high rates of return. When we think about a company's use of debt, we first look at cash and debt together.

What Is Castellum's Net Debt?

As you can see below, Castellum had kr58.9b of debt at December 2024, down from kr62.3b a year prior. However, it also had kr2.40b in cash, and so its net debt is kr56.5b.

A Look At Castellum's Liabilities

According to the last reported balance sheet, Castellum had liabilities of kr8.24b due within 12 months, and liabilities of kr70.4b due beyond 12 months. Offsetting this, it had kr2.40b in cash and kr1.33b in receivables that were due within 12 months. So its liabilities outweigh the sum of its cash and (near-term) receivables by kr75.0b.

Given this deficit is actually higher than the company's market capitalization of kr53.2b, we think shareholders really should watch Castellum's debt levels, like a parent watching their child ride a bike for the first time. In the scenario where the company had to clean up its balance sheet quickly, it seems likely shareholders would suffer extensive dilution.

Check out our latest analysis for Castellum

In order to size up a company's debt relative to its earnings, we calculate its net debt divided by its earnings before interest, tax, depreciation, and amortization (EBITDA) and its earnings before interest and tax (EBIT) divided by its interest expense (its interest cover). Thus we consider debt relative to earnings both with and without depreciation and amortization expenses.

With a net debt to EBITDA ratio of 9.0, it's fair to say Castellum does have a significant amount of debt. However, its interest coverage of 3.9 is reasonably strong, which is a good sign. Investors should also be troubled by the fact that Castellum saw its EBIT drop by 10% over the last twelve months. If things keep going like that, handling the debt will about as easy as bundling an angry house cat into its travel box. The balance sheet is clearly the area to focus on when you are analysing debt. But ultimately the future profitability of the business will decide if Castellum can strengthen its balance sheet over time. So if you want to see what the professionals think, you might find this free report on analyst profit forecasts to be interesting.

Finally, a business needs free cash flow to pay off debt; accounting profits just don't cut it. So we always check how much of that EBIT is translated into free cash flow. During the last three years, Castellum produced sturdy free cash flow equating to 68% of its EBIT, about what we'd expect. This cold hard cash means it can reduce its debt when it wants to.

Our View

To be frank both Castellum's level of total liabilities and its track record of managing its debt, based on its EBITDA, make us rather uncomfortable with its debt levels. But at least it's pretty decent at converting EBIT to free cash flow; that's encouraging. Overall, it seems to us that Castellum's balance sheet is really quite a risk to the business. For this reason we're pretty cautious about the stock, and we think shareholders should keep a close eye on its liquidity. When analysing debt levels, the balance sheet is the obvious place to start. But ultimately, every company can contain risks that exist outside of the balance sheet. These risks can be hard to spot. Every company has them, and we've spotted 3 warning signs for Castellum (of which 1 makes us a bit uncomfortable!) you should know about.

Of course, if you're the type of investor who prefers buying stocks without the burden of debt, then don't hesitate to discover our exclusive list of net cash growth stocks, today.

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This article by Simply Wall St is general in nature. We provide commentary based on historical data and analyst forecasts only using an unbiased methodology and our articles are not intended to be financial advice. It does not constitute a recommendation to buy or sell any stock, and does not take account of your objectives, or your financial situation. We aim to bring you long-term focused analysis driven by fundamental data. Note that our analysis may not factor in the latest price-sensitive company announcements or qualitative material. Simply Wall St has no position in any stocks mentioned.