One of the peculiarities of the NZ market is that it is often priced on tiny sales late in the day. I have seen a $150 sale take millions off the reported value of a company on the market and it is easy to believe that this is a deliberate manipulation. Have a look at Contact energy friday sales pattern. From a start of 639 it shoots up to 645 and stays there most of the day then at 5pm it drops to 637 on 50,000 shares and stays there. Who sold 300G worth of shares, probably at market for that low price?