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SPX Options SKEW Vs VIX

Tyler Durden's picture




 

Submitted by Pater Tenebrarum of Acting-Man blog,

Skew Index Rises Sharply

One of our readers pointed out to us last week that the recent strong rise in the so-called CBOE SKEW index should also be counted among the various divergences that make the stock market's current advance suspect. Skew  measures the perceived tail risk of the market via the pricing of out-of-the-money options. Generally, a rise in skew indicates that 'crash protection' is in demand among institutional investors (institutional/professional investors are the biggest traders in SPX options). The basic idea is similar to the CSFB 'fear index' or the Ansbacher index (which compares the premiums paid on equidistant calls and puts).

A unusual move in the skew index (which historically oscillates approximately between a value of 100 and 150) is especially interesting when it diverges strongly from the VIX, which measures at the money and close to the money front month SPX option premiums.

Basically what a 'low VIX/high skew' combination is saying is: 'the market overall is complacent, but big investors perceive far more tail risk than usually' (it is exactly the other way around when the VIX is high and SKEW is low). In other words, a surprising increase in realized volatility may not be too far away. Below is a chart showing the current SKEW/VIX combination.

 

 


 

SKEW vs VIX

SKEW is rising strongly, even as the VIX is very low – click to enlarge.

 


 

Next is a long term chart which we have taken from the CBOE website. This chart looks a bit 'crowded', but it shows that the current level of the SKEW index is historically on the high side:

 


 

SKEW_index

SKEW vs. VIX, long term. As can be seen, the perception of increased tail risk can be 'early', but it is definitely a warning sign.

 


 

And lastly, here is a chart showing two divergences between VIX and SPX – a bullish and a (potentially) bearish one:

 


 

VIX-SPX divergences

The VIX and the SPX – two divergences (lower high in VIX vs. lower low in SPX at the 2011 low, and currently a higher low in VIX vs. a higher high in SPX) – click to enlarge.

 


 

So here we have some additional evidence that the risk-reward equation in the stock market has recently shifted toward 'risk'. Once again, these are not precise timing signals – as the longer term chart of the SKEW index shows, investors are at times too early worrying about growing tail risk. On the other hand, it is definitely a 'heads-up', and lead and lag times are bound to vary. This is to say, we cannot state apodictically that they are once again 'too early' or how long exactly the lead time of the rise in the SPX options skew will actually turn out to be before the market gets into trouble this time.

 

 

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Mon, 10/28/2013 - 14:50 | 4098495 Max Damage
Max Damage's picture

BTD, BTATFH, just like today. Utter shit data, Buy MOARRRRRRRRRRR

Mon, 10/28/2013 - 14:55 | 4098510 Motorhead
Motorhead's picture

Charts, bitchez!

Mon, 10/28/2013 - 15:06 | 4098554 ParkAveFlasher
ParkAveFlasher's picture

I'm currently charting the yawning gap between my solvency and market "irrationality".  Doesn't look good for the home team.

Mon, 10/28/2013 - 15:15 | 4098585 flacon
flacon's picture

Hopefully the S&P will get into trouble this afternoon. 3:30pm flush perhaps?

Mon, 10/28/2013 - 15:53 | 4098728 Say What Again
Say What Again's picture

Don't try to confuse people with all that Greek options shit.  Answer this question.

Is the bernank still printing?

Nothing else matters.

Mon, 10/28/2013 - 15:10 | 4098577 slaughterer
Mon, 10/28/2013 - 14:51 | 4098498 Cognitive Dissonance
Cognitive Dissonance's picture

"It's different this time." - Every sell side Wall Street house trying to lure in the last of the greater fools.

<"Here kitty kitty kitty." - Goldman>

Mon, 10/28/2013 - 15:03 | 4098544 fooshorter
fooshorter's picture

No offense but how many more squiggley line charts do you need to tell yourself this whole thing is a farce.

Mon, 10/28/2013 - 15:13 | 4098580 B.J. Worthy
B.J. Worthy's picture

SPX is aiming to shatter Felix Baumgartner's freefall record.

Mon, 10/28/2013 - 16:06 | 4098782 Dadburnitpa
Dadburnitpa's picture

I wonder if these guys realize that monkey hammering the VIX every day at the close is like occasionally priming a well pump with hydrochloric acid.  It will work just fine for a while, but when it finally fails, it will be catastrophic and they won't be able to suck anything more out of the system.

Mon, 10/28/2013 - 16:59 | 4098999 SloaneSquare
SloaneSquare's picture

I think this chart is actually displaying the risk during the government shutdown. 

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