ok this is the seller of those 15M shares last week
http://www.asx.com.au/asx/statistics/displayAnnouncement.do?display=pdf&idsId=01116948
still waiting on the buyer of same though
and the previous notice was because dropped below 5% after new shares issued
http://www.asx.com.au/asx/statistics/displayAnnouncement.do?display=pdf&idsId=01116493