What happened to SPX the last time Iran war stasis brings US inflation expectations back to the boil - Reuters surprised the market?

The last comparable event occurred in mid-April 2024 when Iran's direct attack on Israel and the subsequent US/Israeli response cycle pushed 10-year breakeven inflation from 2.25% to 2.55% in eight trading days. Reuters ran a surprise story on April 17 revealing higher-than-expected US refinery utilization and Middle East supply disruption risks. SPX dropped 3.1% over the next three sessions as VIX spiked from 13.8 to 19.4.

For iron condor traders the sequence was textbook: short-dated condors placed the week prior with 45-50 delta wings were breached on the downside within 48 hours. The 0.15% OTM short put wing was taken out when SPX fell below 5,020 from 5,150.

Key ALVH takeaway from that episode: when VIX moves from sub-15 to above 19 on a geopolitical inflation shock, immediately cut wing width from 50-60 points to 30-35 points on the next cycle. Wider wings performed poorly because implied volatility expansion crushed the short strikes faster than the underlying could stabilize. The market recovered within ten days once the physical oil supply risk proved limited, but the initial volatility spike invalidated most standard 45-50 delta iron condors opened in low VIX regimes.

Monitor 10-year breakevens and Reuters supply disruption headlines closely. When both appear together, tighten wings and favor 21-28 DTE over 45 DTE until VIX settles below 17.