As every investor would know, not every swing hits the sweet spot. But you have a problem if you face massive losses more than once in a while. So consider, for a moment, the misfortune of Westport Fuel Systems Inc. (TSE:WPRT) investors who have held the stock for three years as it declined a whopping 88%. That'd be enough to cause even the strongest minds some disquiet. And over the last year the share price fell 32%, so we doubt many shareholders are delighted. Furthermore, it's down 26% in about a quarter. That's not much fun for holders. While a drop like that is definitely a body blow, money isn't as important as health and happiness.

It's worthwhile assessing if the company's economics have been moving in lockstep with these underwhelming shareholder returns, or if there is some disparity between the two. So let's do just that.

Check out our latest analysis for Westport Fuel Systems

Because Westport Fuel Systems made a loss in the last twelve months, we think the market is probably more focussed on revenue and revenue growth, at least for now. Shareholders of unprofitable companies usually desire strong revenue growth. Some companies are willing to postpone profitability to grow revenue faster, but in that case one would hope for good top-line growth to make up for the lack of earnings.

Over three years, Westport Fuel Systems grew revenue at 2.1% per year. Given it's losing money in pursuit of growth, we are not really impressed with that. Nonetheless, it's fair to say the rapidly declining share price (down 24%, compound, over three years) suggests the market is very disappointed with this level of growth. While we're definitely wary of the stock, after that kind of performance, it could be an over-reaction. Before considering a purchase, take a look at the losses the company is racking up.

You can see how earnings and revenue have changed over time in the image below (click on the chart to see the exact values).

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

While the broader market gained around 25% in the last year, Westport Fuel Systems shareholders lost 32%. 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. Unfortunately, last year's performance may indicate unresolved challenges, given that it was worse than the annualised loss of 13% over the last half decade. Generally speaking long term share price weakness can be a bad sign, though contrarian investors might want to research the stock in hope of a turnaround. While it is well worth considering the different impacts that market conditions can have on the share price, there are other factors that are even more important. Take risks, for example - Westport Fuel Systems has 2 warning signs we think you should be aware of.