There's no doubt that money can be made by owning shares of unprofitable businesses. For example, although software-as-a-service business Salesforce.com lost money for years while it grew recurring revenue, if you held shares since 2005, you'd have done very well indeed. Having said that, unprofitable companies are risky because they could potentially burn through all their cash and become distressed.
So, the natural question for Korro Bio (NASDAQ:KRRO) 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.
How Long Is Korro Bio's Cash Runway?
A cash runway is defined as the length of time it would take a company to run out of money if it kept spending at its current rate of cash burn. When Korro Bio last reported its June 2026 balance sheet in August 2026, it had zero debt and cash worth US$115m. In the last year, its cash burn was US$68m. That means it had a cash runway of around 20 months as of June 2026. That's not too bad, but it's fair to say the end of the cash runway is in sight, unless cash burn reduces drastically. You can see how its cash balance has changed over time in the image below.
View our latest analysis for Korro Bio
How Well Is Korro Bio Growing?
On balance, we think it's mildly positive that Korro Bio trimmed its cash burn by 7.6% over the last twelve months. In contrast, however, operating revenue tanked 62% during the period. Taken together, we think these growth metrics are a little worrying. 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 Korro Bio Raise More Cash Easily?
Even though it seems like Korro Bio is developing its business nicely, we still like to consider how easily it could raise more money to accelerate growth. Issuing new shares, or taking on debt, are the most common ways for a listed company to raise more money for its business. 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.
Korro Bio has a market capitalisation of US$130m and burnt through US$68m last year, which is 53% of the company's market value. From this perspective, it seems that the company spent a huge amount relative to its market value, and we'd be very wary of a painful capital raising.
Is Korro Bio's Cash Burn A Worry?
On this analysis of Korro Bio's cash burn, we think its cash runway was reassuring, while its falling revenue has us a bit worried. Looking at the factors mentioned in this short report, we do think that its cash burn is a bit risky, and it does make us slightly nervous about the stock. On another note, Korro Bio has 6 warning signs (and 2 which shouldn't be ignored) 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)
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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.