There’s no doubt that money can be made by owning shares of unprofitable businesses. 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. Having said that, unprofitable companies are risky because they could potentially burn through all their cash and become distressed.
So, the natural question for Tectonic Therapeutic (NASDAQ:TECX) shareholders is whether they should be concerned by its rate of cash burn. For the purpose of this article, we’ll define cash burn as the amount of cash the company is spending each year to fund its growth (also called its negative free cash flow). First, we’ll determine its cash runway by comparing its cash burn with its cash reserves.
A company’s cash runway is calculated by dividing its cash hoard by its cash burn. When Tectonic Therapeutic last reported its September 2025 balance sheet in November 2025, it had zero debt and cash worth US$268m. In the last year, its cash burn was US$63m. So it had a cash runway of about 4.3 years from September 2025. A runway of this length affords the company the time and space it needs to develop the business. You can see how its cash balance has changed over time in the image below.
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Tectonic Therapeutic didn’t record any revenue over the last year, indicating that it’s an early stage company still developing its 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 16% in the last year, it seems that the company is ratcheting up investment in the business over time. That’s not necessarily a bad thing, but investors should be mindful of the fact that will shorten the cash runway. 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.
Given its cash burn trajectory, Tectonic Therapeutic shareholders may wish to consider how easily it could raise more cash, despite its solid cash runway. 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.
