If you're worried about liquidity of stocks forget NZ (being a Kiwi myself) it is a waste of time investing on the NZX IMO...
... also far better real time information on the ASX if you're using E*Trade or the like.
I'd keep all/ some of MTU if I was you. Also be careful of oilers at present - note UBS just downgraded most of their oiler stocks on back of lower long term projected price of oil (POO)
Good luck anyway...
MTU Price at posting:
64.0¢ Sentiment: Hold Disclosure: Held