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.' It's only natural to consider a company's balance sheet when you examine how risky it is, since debt is often involved when a business collapses. We note that Ciena Corporation (NYSE:CIEN) does have debt on its balance sheet. But the real question is whether this debt is making the company risky.

When Is Debt Dangerous?

Generally speaking, debt only becomes a real problem when a company can't easily pay it off, either by raising capital or with its own cash flow. In the worst case scenario, a company can go bankrupt if it cannot pay its creditors. However, a more frequent (but still costly) occurrence is where a company must issue shares at bargain-basement prices, permanently diluting shareholders, just to shore up its balance sheet. Of course, debt can be an important tool in businesses, particularly capital heavy businesses. When we think about a company's use of debt, we first look at cash and debt together.

What Is Ciena's Net Debt?

The chart below, which you can click on for greater detail, shows that Ciena had US$1.54b in debt in November 2024; about the same as the year before. However, it also had US$1.25b in cash, and so its net debt is US$293.6m.

How Healthy Is Ciena's Balance Sheet?

The latest balance sheet data shows that Ciena had liabilities of US$999.8m due within a year, and liabilities of US$1.83b falling due after that. Offsetting these obligations, it had cash of US$1.25b as well as receivables valued at US$1.08b due within 12 months. So its liabilities outweigh the sum of its cash and (near-term) receivables by US$491.5m.

Given Ciena has a humongous market capitalization of US$12.3b, it's hard to believe these liabilities pose much threat. But there are sufficient liabilities that we would certainly recommend shareholders continue to monitor the balance sheet, going forward.

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). This way, we consider both the absolute quantum of the debt, as well as the interest rates paid on it.

Looking at its net debt to EBITDA of 0.90 and interest cover of 5.5 times, it seems to us that Ciena is probably using debt in a pretty reasonable way. But the interest payments are certainly sufficient to have us thinking about how affordable its debt is. Importantly, Ciena's EBIT fell a jaw-dropping 50% in the last twelve months. If that decline continues then paying off debt will be harder than selling foie gras at a vegan convention. There's no doubt that we learn most about debt from the balance sheet. But it is future earnings, more than anything, that will determine Ciena's ability to maintain a healthy balance sheet going forward. So if you're focused on the future you can check out this free report showing analyst profit forecasts.

But our final consideration is also important, because a company cannot pay debt with paper profits; it needs cold hard cash. So we always check how much of that EBIT is translated into free cash flow. Looking at the most recent three years, Ciena recorded free cash flow of 24% of its EBIT, which is weaker than we'd expect. That weak cash conversion makes it more difficult to handle indebtedness.

Our View

Ciena's struggle to grow its EBIT had us second guessing its balance sheet strength, but the other data-points we considered were relatively redeeming. For example, its net debt to EBITDA is relatively strong. Looking at all the angles mentioned above, it does seem to us that Ciena is a somewhat risky investment as a result of its debt. That's not necessarily a bad thing, since leverage can boost returns on equity, but it is something to be aware of. 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. For example - Ciena has 1 warning sign we think you should be aware of.

If, after all that, you're more interested in a fast growing company with a rock-solid balance sheet, then check out our list of net cash growth stocks without delay.

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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.