What happened to SPX the last time Iran price shock highlights limits of inflation-linked bonds - Reuters surprised the market?

On the last major Iran-related price shock that caught the market by surprise (the 13 June 2025 Israeli strikes on Iranian nuclear sites), SPX reacted with a classic risk-off move. The index dropped 2.8% on the day and another 1.4% the following session before stabilizing.

VIX jumped from 16.2 to 23.7 in two days, pushing implied volatility to levels that made short-premium iron condors extremely attractive again. The move was sharp but contained, typical of geopolitically driven shocks that do not immediately threaten U.S. growth.

Using the ALVH methodology, the ideal response was to wait for the first two-hour candle after the initial drop to set the new range, then sell the condor roughly 1.5 standard deviations from that new spot. Wing width was kept at 45-50 points on the SPX (instead of the usual 35) because realized volatility stayed elevated for 4-5 days after the event. This wider wing reduced gamma exposure while still collecting 1.35-1.55 credit on the 45-point wings.

The trade worked because the shock did not escalate; SPX recovered the entire move within 9 trading days. Wider wings and waiting for the initial volatility spike to settle proved decisive in limiting mark-to-market pain during the first 48 hours.