anglo just a substantial holder or more?

original post question on wrong forum (asx general):
Anglo now hold 26,708,963 shares this being 18.25% of all company shares. They have now consistently and yet slowly increased their holding in MUN, clearly taking advantage of the lower sp.

What is the limit before a formal T/O must be announced?

I know there is something regarding a 15% holding however I just can't recall what it actually is.

Anyone know this off the top of their head?

One thing is for sure Anglo likes MUN ;)

Latest finding (unconfirmed):
The Corporations Act seems to indicate you can't increase your holding from under 20% to over 20%. Unless it is via a formal takeover bid or by slowly increasing holdings by 3% every 6 months or something like that...sounds familiar with Anglo and MUN.

Anyone have more information, or more importantly accurate information?

I am now thinking Anglo are pursuing MUN as a T/O target.