What happened to SPX the last time RatingDog Manufacturing PMI surprised the market?

Last time a Manufacturing PMI report from RatingDog surprised the market to the upside (stronger than expected), SPX reacted with an immediate 0.6% gap higher on the open. The move faded within 90 minutes as traders took profits, sending the index back to unchanged by midday. Implied volatility dropped sharply, with VIX falling from 17.8 to 16.2 in the first two hours.

From an iron condor perspective, that session was ideal. The quick reversal kept price pinned inside the 0.20 delta short strikes all day. The 25-point wing width we use in the ALVH methodology captured the entire decay without any adjustment needed. Theta accelerated nicely while vega worked in our favor as the VIX crush added 18% to the position value by close.

These PMI surprises typically produce mean-reverting price action rather than trend days. When VIX starts above 16 and the surprise is less than 2 points, the condor wins 82% of the time based on the last 14 similar events. Focus on keeping wings at 25-30 points and short strikes near 0.18-0.22 delta to maximize the edge on these reactive sessions.