Hawk Yes I'm certain there are some 26 yr old guys working for Volkswagen today who did exactly the same thing as you ...They work for the Co , did their DD etc etc and have all their investment $ tied up in Volkswagen ..what could go wrong , they know the company right ?
You can NEVER know all the risks about any one company ..which is why you diversify You need to understand "risk adjusted rate of return"...its been years since I studied basic finance ...Gabor is more fluent /current and can probably explain the concept to you.
You'd be better off putting 1/2 in an index fund and gambling with the other half - and I'm serious - since 2009 very few investments have paid off better than the S&P 500, QQQ, or the Russell indexes.