> No one company should be more than 15% of your portfolio. Even the one you work at.

Tell that to the guy who went all-in for NVidia employee share purchase plan and is worth more than 50M USD. (I think it was a Register article posted here recently.) Sometimes the gamble is worth it. That said, for every one of those once-in-a-lifetime stories, there are many, many more about engineers who walked away from post-IPO start-ups with very little wealth gained. So many have posted here before, it just isn't worth it.