And if you don't recall... two index funds, XIV and SVXY got saw their combined value shrink to $150 million from $3 billion in a day of trading earlier this month. It looks like this was written in Oct 17.
Thiel Macro (Peter Thiel's personal investment firm) apparently was also well-positioned for the event.
https://www.theguardian.com/business/2018/feb/09/how-artemis...
https://www.zerohedge.com/news/2018-02-16/peter-thiel-makes-...
https://static1.squarespace.com/static/5581f17ee4b01f59c2b15...
I don't blame them for extrapolating the likely consequences of central bank recklessness, and positioning themselves accordingly.