Quarterhill shareholders are up 18% for the year. But that was short of the market average. On the bright side, that's still a gain, and it's actually better than the average return of 4% over half a decade It is possible that returns will improve along with the business fundamentals. It's always interesting to track share price performance over the longer term. But to understand Quarterhill better, we need to consider many other factors. Consider risks, for instance. Every company has them, and we've spotted 1 warning sign for Quarterhill you should know about.