I guess whether having 40 or even 80% of your portfolio made up of one single stock is healthy depends on your risk appetite. It's happened to me too many times before that my portfolio doubled and then went back down into red territory in the same year - wouldn't want that to happen again.

A stock like CMM can go down, let us not forget that. Regardless of how positive the fundamentals are, technically this stock is ready for a serious correction. In fact, the more I look at the picture, the more I realise that it is time to cash.

The last candle in the weekly chart is completely outside the Bollinger Bands and RSI is o/b and could be topping here. A quick drop to the EMA(9)-line crossing at around $0.60 seems like the most conservative scenario for a healthy intermediate correction.

Of course, just my 2 pence - do your own DD.