It's a risk management thing. If the company folds or has bad times, it would suck to lose both your job and a significant part of your investments. For that re

It's a risk management thing. If the company folds or has bad times, it would suck to lose both your job and a significant part of your investments. For that reason, you should not treat your company stock as more special, more safe, or more profitable – making your company's stock a significant part of portfolio just because you're working for them. On the contrary, it's more risky for you because you're working for them.