Building a successful investment portfolio takes skill and hard work, no matter if you're a growth, value, income, or momentum-focused investor. But how do you find the right combination of stocks?

Here is how Matrix Service (MTRX) and Array Technologies, Inc. (ARRY) have performed compared to their sector so far this year.

Whether you're a growth, value, income, or momentum-focused investor, building a successful investment portfolio takes skill, research, and a little bit of luck. How do you find the right combination ...