Mac Prime has just released their margin rate changes at 4:30pm today and effective 22nd Jan, NEN will go from being able to borrow 54% to 0%.http://www.macquarie.com.au/dafiles/Internet/mgl/au/docs-pa/fact-sheet/prime-margin-rate-change-14-jan-2014.pdfMac Prime normally give you 24hrs to come up with more cash so I'd say if anyone was on margin with NEN they would have already had to stump up more cash or been closed out.