Why all indices are down but XIV is up?

It isn't unusual for VIX derivatives to follow their own path for short periods of time, as they aren't perfectly correlated with the market indexes. This is especially true when VIX levels are at extreme lows or highs.
 
Someone teach me why?

XIV has negative convexity vs. the SPX, meaning that it does better (worse) than a linear SPX beta model would predict on days with small (large) squared SPX returns. In other words, XIV tends to outperform when the absolute value of the SPX move is small.
 
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