It's nice to see that Merit Medical Systems shareholders have received a total shareholder return of 7.6% over the last year. However, the TSR over five years, coming in at 10% per year, is even more impressive. It's always interesting to track share price performance over the longer term. But to understand Merit Medical Systems better, we need to consider many other factors. Take risks, for example - Merit Medical Systems has 1 warning sign we think you should be aware of.