Hey!!! What is going on???There was one seller with 2,575,000...

Hey!!! What is going on???
There was one seller with 2,575,000 shares on the sell side and he is only one of many extremely large sellers lately.
Now i have had a look at the Top 20 holders of KEY and the bottom of that list holds 2,000,000 shares so how come there have been no substantial holder announcements???
This one after he has flogged his total order which the way they are being taken up will be this arvo should be flagged via an ASX Sub Holders Announcement late next week but there should have been others announced by now?
What am i missing here???
The trading pattern in KEY over the past week or two is weird to say the least and i am staggered that the ASX hasn't asked for a please explain from the company?
Not that i personally am complaining considering the share price is still rising, but something is fishy as to where all these large sellers keep coming out of the blue???