substantial holder / s

while this looks like 2 substantial holders have sold off and taken profit it appears they are one and the same. scroll down Challenger's list of related companies and you find Nova Port then the table of transactions is exactly the same on both notices.
Not a bad return in a short time,pick up 1/2 mill shares in an issue and flog them off for a healthy profit. I'm not concerned by the selling, but I am interested in who bought them and nudged up the price another insto? or a lot of existing holders who did not get many last time they fed the chooks.
Still pleased the price is stabilised and with the big sell off over and less on the market could see a small increase again before the annual report.