If its a predator then that is probably fine. If its someone that has been informed of the deal ahead of ASX announcement and is getting in before the general market has been informed that is not fine.
The ASX should investigate all trades after 3.55 pm which were above 94c (the highest price the stock traded at up till that point). Even small trades could be part of an accumulation (multiple purchases) by someone with insider information.
Monday coud be an interesting day.
IRN Price at posting:
86.2¢ Sentiment: Buy Disclosure: Held