Every company -- even our favorite investments -- have things that concern us. In most cases, these are just little things that we keep an eye on. There are times, however, when we do our research on a company only to discover something so egregious that we simply don’t want to invest. These “red flags” stop us in our tracks and cause us to move on from that particular investment. What constitutes a red flag, however, differs from investor to investor. We’ll take a look at some of ours and share some that you shared with us.