One week ago, on November 9 something snapped in the Nikkei, which in the span of just over an one hour (from 13:20 to 14:30) crashed more than 800 points (before closing almost unchanged) at the same time as it was revealed that foreigners had just bought a record amount of Japanese stocks the previous month.
As expected, numerous theories emerged shortly after the wild plunge, with explanation from the mundane, i.e., foreigners dumping as the upward momentum abruptly ended, to the “Greek”, as gamma and vega stops were hit by various vol-targeting (CTAs, systemic, variable annutities and risk parity) funds. One such explanation came from Deutsche Bank, which attributed the move to a volatility shock, as “heightened volatility appears to have triggered program trades to reduce risk”, and catalyzed by a rare swoon in both stocks and bonds, which led to a surge in Nikkei volatility…
… and forced highly leveraged risk parity funds and their peers to quickly delever. As DB’s Masao Muraki explained at the time:
This post was published at Zero Hedge on Nov 16, 2017.