What happened to SPX the last time France Q1 preliminary GDP 0.0% vs +0.2% q/q expected surprised the market?

The last time Frances Q1 preliminary GDP came in at 0.0% versus +0.2% expected the SPX dropped approximately 0.65% on the day. This was a modest risk-off reaction typical for a soft European growth print during a period when VIX was already elevated around 18-19.

For iron condor traders using the ALVH methodology this type of miss usually triggers a 4-6 point VIX spike intraday that fades partially by close. The SPX stays within normal one-standard-deviation move but tests the short put wing if you are running 10-15 delta shorts with 45-50 point wings.

Wing-width management tip: On European data days like this keep wings no tighter than 50 points on SPX when VIX is above 17. Tighter wings get breached too easily on the resulting volatility expansion even if the closing move is only 0.6-0.7%. If you are already in a trade reduce size immediately on the surprise and let the position breathe rather than adjusting strikes same-day. The ALVH model flags these events as moderate risk setups that require extra wing buffer rather than full avoidance.