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What the S&P 500 Term Structure Says
06/13/2013 7:00 am EST
Changes in the slope of the VIX term structure have more explanatory power than many of the technical signals and chart patterns favored by directional traders, opines Jared Woodard of CondorOptions.com.
The only two occasions when we got close to backwardation here were in May 2012 and the end of December 2012 (fiscal cliff). In 2013, the mean level has been about 0.83, which just means that three-month SPY options were typically about 83% as expensive, in IV terms, as one year SPY options. We're intentionally using further dated options to filter out some noise of the sort that you would get with e.g. a VIX study.
There were three occasions that got the 3m1y term structure to perk up this year, but it's the most recent jog higher that has my attention. Instead of spiking higher, the term structure rose steadily from mid-May until it peaked around 0.90 on June 5.
Keep in mind that this flattening of the term structure-presumably on talk of reduced Fed asset purchases?-required a decline of less than 70 S&P 500 points. The chart below zooms in on this period with SPY prices for comparison. This behavior seems consistent with the nervous fidgeting I described in late April.
After the big rally on June 7, the market has already made up half the distance to its recent closing high. Option implied volatility, though, has further to fall. If stock prices continue to stabilize and the 3m1y estimate returns to its recent floor, a time spread opened for a debit (short three-month, long one year) should perform well. Given the preference these days for unrelenting marches higher, I wouldn't care to be short upside gamma too close to the money, so a double calendar or double diagonal makes more sense.
By Jared Woodard of CondorOptions.com
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