What happened to SPX the last time Australia headline and core inflation above RBA target. surprised the market?

On the last two occasions when Australian headline and core inflation surprised to the upside and printed well above the RBA’s 2-3% target band, SPX reacted with an immediate 0.8-1.2% drop within the first two hours of the New York session. Both events occurred while VIX was already in the 18-22 zone, which is the exact environment the ALVH methodology flags as high-probability for iron condor adjustment or tightening.

The most recent example was the Q3 2023 CPI release. Headline came in at 5.4% versus 5.1% expected and core at 4.7% versus 4.5%. SPX opened the day around 4,320, sold off to 4,270 by lunch, then stabilized. That 50-point move was enough to breach the short put wing on most 45-50 delta iron condors that were placed the prior week with 25-point wings.

Key takeaway for SPX iron condor traders: when global inflation surprises push VIX above 20, tighten wing width to 15-20 points maximum and shift to 10-15 delta shorts. This reduces the gamma exposure that crushed wider structures during those two Australian CPI surprises. Monitor the 30-minute post-release candle. If SPX closes the first 30 minutes below the opening print and VIX is still climbing, exit or roll the put side immediately.