Bigphos, I am asking myself the same question about Attara. Actually, they sold most of their position -

Attara Substantial Shareholders sold 195,113,331 National Australian Diamond shares on-market on February 2 and February 4, 2010, ceasing to be a substantial holder.

The question is what is behind that transaction (buying and selling 2 month later) and who is Pan Australia Nomenees Pty that bought the shares.