Just because a business does not make any money, does not mean that the stock will go down. For example, biotech and mining exploration companies often lose money for years before finding success with a new treatment or mineral discovery. Nonetheless, only a fool would ignore the risk that a loss making company burns through its cash too quickly.

So, the natural question for Atossa Therapeutics (NASDAQ:ATOS) shareholders is whether they should be concerned by its rate of cash burn. In this article, we define cash burn as its annual (negative) free cash flow, which is the amount of money a company spends each year to fund its growth. The first step is to compare its cash burn with its cash reserves, to give us its 'cash runway'.

When Might Atossa Therapeutics Run Out Of Money?

You can calculate a company's cash runway by dividing the amount of cash it has by the rate at which it is spending that cash. As at June 2026, Atossa Therapeutics had cash of US$26m and no debt. In the last year, its cash burn was US$36m. That means it had a cash runway of around 9 months as of June 2026. To be frank, this kind of short runway puts us on edge, as it indicates the company must reduce its cash burn significantly, or else raise cash imminently. The image below shows how its cash balance has been changing over the last few years.

How Is Atossa Therapeutics' Cash Burn Changing Over Time?

Because Atossa Therapeutics isn't currently generating revenue, we consider it an early-stage business. Nonetheless, we can still examine its cash burn trajectory as part of our assessment of its cash burn situation. With the cash burn rate up 43% in the last year, it seems that the company is ratcheting up investment in the business over time. However, the company's true cash runway will therefore be shorter than suggested above, if spending continues to increase. Clearly, however, the crucial factor is whether the company will grow its business going forward. So you might want to take a peek at how much the company is expected to grow in the next few years.

How Hard Would It Be For Atossa Therapeutics To Raise More Cash For Growth?

Since its cash burn is moving in the wrong direction, Atossa Therapeutics shareholders may wish to think ahead to when the company may need to raise more cash. Generally speaking, a listed business can raise new cash through issuing shares or taking on debt. One of the main advantages held by publicly listed companies is that they can sell shares to investors to raise cash and fund growth. By looking at a company's cash burn relative to its market capitalisation, we gain insight on how much shareholders would be diluted if the company needed to raise enough cash to cover another year's cash burn.

Atossa Therapeutics' cash burn of US$36m is about 138% of its US$26m market capitalisation. That suggests the company may have some funding difficulties, and we'd be very wary of the stock.

So, Should We Worry About Atossa Therapeutics' Cash Burn?

There are no prizes for guessing that we think Atossa Therapeutics' cash burn is a bit of a worry. Take, for example, its cash burn relative to its market cap, which suggests the company may have difficulty funding itself, in the future. And although we accept its increasing cash burn wasn't as worrying as its cash burn relative to its market cap, it was still a real negative; as indeed were all the factors we considered in this article. After considering the data discussed in this article, we don't have a lot of confidence that its cash burn rate is prudent, as it seems like it might need more cash soon. On another note, Atossa Therapeutics has 5 warning signs (and 2 which are potentially serious) we think you should know about.

Of course, you might find a fantastic investment by looking elsewhere. So take a peek at this free list of interesting companies, and this list of stocks growth stocks (according to analyst forecasts)

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.