We can readily understand why investors are attracted to unprofitable companies. For example, biotech and mining exploration companies often lose money for years before finding success with a new treatment or mineral discovery. But the harsh reality is that very many loss making companies burn through all their cash and go bankrupt.

Given this risk, we thought we'd take a look at whether Rhythm Pharmaceuticals (NASDAQ:RYTM) shareholders should be worried about its 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'.

View our latest analysis for Rhythm Pharmaceuticals

Does Rhythm Pharmaceuticals Have A Long Cash Runway?

A company's cash runway is calculated by dividing its cash hoard by its cash burn. When Rhythm Pharmaceuticals last reported its December 2024 balance sheet in February 2025, it had zero debt and cash worth US$321m. Importantly, its cash burn was US$165m over the trailing twelve months. That means it had a cash runway of around 23 months as of December 2024. Importantly, analysts think that Rhythm Pharmaceuticals will reach cashflow breakeven in 3 years. That means unless the company reduces its cash burn quickly, it may well look to raise more cash. The image below shows how its cash balance has been changing over the last few years.

How Well Is Rhythm Pharmaceuticals Growing?

At first glance it's a bit worrying to see that Rhythm Pharmaceuticals actually boosted its cash burn by 16%, year on year. Having said that, it's revenue is up a very solid 68% in the last year, so there's plenty of reason to believe in the growth story. The company needs to keep up that growth, if it is to really please shareholders. It seems to be growing nicely. Clearly, however, the crucial factor is whether the company will grow its business going forward. For that reason, it makes a lot of sense to take a look at our analyst forecasts for the company.

Can Rhythm Pharmaceuticals Raise More Cash Easily?

While Rhythm Pharmaceuticals seems to be in a fairly good position, it's still worth considering how easily it could raise more cash, even just to fuel faster growth. 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. 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.

Since it has a market capitalisation of US$3.1b, Rhythm Pharmaceuticals' US$165m in cash burn equates to about 5.3% of its market value. Given that is a rather small percentage, it would probably be really easy for the company to fund another year's growth by issuing some new shares to investors, or even by taking out a loan.

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

As you can probably tell by now, we're not too worried about Rhythm Pharmaceuticals' cash burn. In particular, we think its revenue growth stands out as evidence that the company is well on top of its spending. While its increasing cash burn wasn't great, the other factors mentioned in this article more than make up for weakness on that measure. Shareholders can take heart from the fact that analysts are forecasting it will reach breakeven. Looking at all the measures in this article, together, we're not worried about its rate of cash burn; the company seems well on top of its medium-term spending needs. We think it's very important to consider the cash burn for loss making companies, but other considerations such as the amount the CEO is paid can also enhance your understanding of the business. You can click here to see what Rhythm Pharmaceuticals' CEO gets paid each year.

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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.