Have a quick look at what they did to GDXJ after hours, what you can't see is that they nailed it for seconds in mid-afternoon to $15.52 (see low for day listed), this has been removed from the chart, I don't know why (but I saw it at the time and down graph was stunning). This kind of manipulative moves are so blatant and so obvious but for sure the entity doing them doesn't care and has no fear of regulators.

http://www.marketwatch.com/investing/fund/GDXJ