There are many ways to value potential investment opportunities. A more off-the-radar approach is to look for companies that get high ratings from employees.

The logic is simple. When employees are happy, they’re likely to be more productive. Happy work environments are conducive to open communication about policies or projects that are (or aren’t) working. It makes hiring and retaining top talent easier, and that factor can have a significant impact on a company’s bottom line.

That’s why one way to screen for potential investments may be to look at publicly-traded companies that are highly regarded by the folks that work there. We’ve identified the top three: