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BRAIN Biotech (ETR:BNN investor five-year losses grow to 70% as the stock sheds €8.7m this past week

Simply Wall St·12/19/2025 04:23:28
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BRAIN Biotech AG (ETR:BNN) shareholders should be happy to see the share price up 21% in the last quarter. But will that repair the damage for the weary investors who have owned this stock as it declined over half a decade? Probably not. Five years have seen the share price descend precipitously, down a full 70%. It's true that the recent bounce could signal the company is turning over a new leaf, but we are not so sure. The fundamental business performance will ultimately determine if the turnaround can be sustained.

Given the past week has been tough on shareholders, let's investigate the fundamentals and see what we can learn.

BRAIN Biotech wasn't profitable in the last twelve months, it is unlikely we'll see a strong correlation between its share price and its earnings per share (EPS). Arguably revenue is our next best option. Generally speaking, companies without profits are expected to grow revenue every year, and at a good clip. That's because fast revenue growth can be easily extrapolated to forecast profits, often of considerable size.

Over five years, BRAIN Biotech grew its revenue at 9.0% per year. That's a fairly respectable growth rate. So the stock price fall of 11% per year seems pretty steep. The truth is that the growth might be below expectations, and investors are probably worried about the continual losses.

The company's revenue and earnings (over time) are depicted in the image below (click to see the exact numbers).

earnings-and-revenue-growth
XTRA:BNN Earnings and Revenue Growth December 19th 2025

Balance sheet strength is crucial. It might be well worthwhile taking a look at our free report on how its financial position has changed over time.

A Different Perspective

Investors in BRAIN Biotech had a tough year, with a total loss of 25%, against a market gain of about 17%. Even the share prices of good stocks drop sometimes, but we want to see improvements in the fundamental metrics of a business, before getting too interested. Regrettably, last year's performance caps off a bad run, with the shareholders facing a total loss of 11% per year over five years. We realise that Baron Rothschild has said investors should "buy when there is blood on the streets", but we caution that investors should first be sure they are buying a high quality business. I find it very interesting to look at share price over the long term as a proxy for business performance. But to truly gain insight, we need to consider other information, too. Take risks, for example - BRAIN Biotech has 2 warning signs we think you should be aware of.

If you would prefer to check out another company -- one with potentially superior financials -- then do not miss this free list of companies that have proven they can grow earnings.

Please note, the market returns quoted in this article reflect the market weighted average returns of stocks that currently trade on German exchanges.