We can readily understand why investors are attracted to unprofitable companies. For example, although Amazon.com made losses for many years after listing, if you had bought and held the shares since 1999, you would have made a fortune. But the harsh reality is that very many loss making companies burn through all their cash and go bankrupt.

So, the natural question for Amylyx Pharmaceuticals (NASDAQ:AMLX) shareholders is whether they should be concerned by its rate of cash burn. For the purposes of this article, cash burn is the annual rate at which an unprofitable company spends cash to fund its growth; its negative free cash flow. First, we'll determine its cash runway by comparing its cash burn with its cash reserves.

Does Amylyx Pharmaceuticals Have A Long Cash Runway?

A company's cash runway is the amount of time it would take to burn through its cash reserves at its current cash burn rate. As at June 2024, Amylyx Pharmaceuticals had cash of US$310m and no debt. Looking at the last year, the company burnt through US$60m. That means it had a cash runway of about 5.2 years as of June 2024. Even though this is but one measure of the company's cash burn, the thought of such a long cash runway warms our bellies in a comforting way. Depicted below, you can see how its cash holdings have changed over time.

How Well Is Amylyx Pharmaceuticals Growing?

It was fairly positive to see that Amylyx Pharmaceuticals reduced its cash burn by 34% during the last year. And arguably the operating revenue growth of 56% was even more impressive. We think it is growing rather well, upon reflection. While the past is always worth studying, it is the future that matters most of all. So you might want to take a peek at how much the company is expected to grow in the next few years.

Can Amylyx Pharmaceuticals Raise More Cash Easily?

We are certainly impressed with the progress Amylyx Pharmaceuticals has made over the last year, but it is also worth considering how costly it would be if it wanted to raise more cash to fund faster growth. Generally speaking, a listed business can raise new cash through issuing shares or taking on debt. Commonly, a business will sell new shares in itself to raise cash and drive growth. We can compare a company's cash burn to its market capitalisation to get a sense for how many new shares a company would have to issue to fund one year's operations.

Amylyx Pharmaceuticals' cash burn of US$60m is about 22% of its US$267m market capitalisation. That's not insignificant, and if the company had to sell enough shares to fund another year's growth at the current share price, you'd likely witness fairly costly dilution.

So, Should We Worry About Amylyx Pharmaceuticals' Cash Burn?

It may already be apparent to you that we're relatively comfortable with the way Amylyx Pharmaceuticals is burning through its cash. In particular, we think its revenue growth stands out as evidence that the company is well on top of its spending. Although its cash burn relative to its market cap does give us reason for pause, the other metrics we discussed in this article form a positive picture overall. Based on the factors mentioned in this article, we think its cash burn situation warrants some attention from shareholders, but we don't think they should be worried. Readers need to have a sound understanding of business risks before investing in a stock, and we've spotted 2 warning signs for Amylyx Pharmaceuticals that potential shareholders should take into account before putting money into a stock.

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

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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.