Even when a business is losing money, it's possible for shareholders to make money if they buy a good business at the right price. 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. Nonetheless, only a fool would ignore the risk that a loss making company burns through its cash too quickly.

So, the natural question for Lyell Immunopharma (NASDAQ:LYEL) 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. We'll start by comparing its cash burn with its cash reserves in order to calculate its cash runway.

Does Lyell Immunopharma Have A Long Cash Runway?

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. In March 2026, Lyell Immunopharma had US$254m in cash, and was debt-free. Importantly, its cash burn was US$134m over the trailing twelve months. Therefore, from March 2026 it had roughly 23 months of cash runway. 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. Importantly, if we extrapolate recent cash burn trends, the cash runway would be noticeably longer. The image below shows how its cash balance has been changing over the last few years.

How Is Lyell Immunopharma's Cash Burn Changing Over Time?

Whilst it's great to see that Lyell Immunopharma has already begun generating revenue from operations, last year it only produced US$31k, so we don't think it is generating significant revenue, at this point. Therefore, for the purposes of this analysis we'll focus on how the cash burn is tracking. While it hardly paints a picture of imminent growth, the fact that it has reduced its cash burn by 24% over the last year suggests some degree of prudence. While the past is always worth studying, it is the future that matters most of all. For that reason, it makes a lot of sense to take a look at our analyst forecasts for the company.

How Hard Would It Be For Lyell Immunopharma To Raise More Cash For Growth?

While Lyell Immunopharma is showing a solid reduction in its cash burn, 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. Commonly, a business will sell new shares in itself to raise cash and drive growth. By comparing a company's annual cash burn to its total market capitalisation, we can estimate roughly how many shares it would have to issue in order to run the company for another year (at the same burn rate).

Lyell Immunopharma's cash burn of US$134m is about 48% of its US$279m market capitalisation. That's high expenditure relative to the value of the entire company, so if it does have to issue shares to fund more growth, that could end up really hurting shareholders returns (through significant dilution).

Is Lyell Immunopharma's Cash Burn A Worry?

On this analysis of Lyell Immunopharma's cash burn, we think its cash runway was reassuring, while its cash burn relative to its market cap has us a bit worried. We don't think its cash burn is particularly problematic, but after considering the range of factors in this article, we do think shareholders should be monitoring how it changes over time. On another note, Lyell Immunopharma has 4 warning signs (and 2 which are concerning) we think you should know about.

If you would prefer to check out another company with better fundamentals, then do not miss this free list of interesting companies, that have HIGH return on equity and low debt or this list of stocks which are all forecast to grow.

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.