What the data shows about SPX extension risk when VIX < 19S&P 500SP:SPXOfficialTraderSwiftTLDR: if you're legging a condor wider than ±0.75% on a 0.5–0.7% moderate open in this environment, the two legs aren't equivalent. The call side is historically near-zero for end-of-day risk beyond +1.0%. The put side isn't. - Most mornings aren't explosive. The setup I've been looking at: SPX moves 0.5–0.7% in either direction by 10am, prior-day VIX in the 16–19 range. That's a common, unremarkable open in a moderate-vol environment. Here's what the data shows about extension risk from that point. I measured how often price continued an additional X% beyond the 10am extreme for the rest of the session. Dataset is SPX 5-min back to 2010 - 110 qualifying up sessions and 94 down sessions in this specific setup. Starting tight: At ±0.25% beyond the 10am extreme, the two sides are almost identical: 44.5% of up sessions see the call touched, 44.7% of down sessions see the put touched. Symmetric to a rounding error. Reversion is also similar - about 40–50% of touches close back inside. Tight condor structure is genuinely balanced here. At ±0.5%: Still close - 21.8% call touch, 25.5% put touch. The put side carries a small premium but nothing dramatic. Effective max-loss rate (touch but close outside) is 15.5% calls vs 17.0% puts. Where it breaks: Go to ±0.75% and the divergence starts - 10.0% calls vs 16.0% puts. At ±1.0% it's 2.7% vs 10.6%. Nearly four times the historical touch rate on the put side at the same distance. The call number at +1.0% also has a different character: 67% of those touches reversed by close. Effective max-loss rate drops to 0.9%. Two sessions out of 110 ended with the call closed above the +1.0% level. The put at -1.0% reverts 50% of the time, leaving an effective rate of 5.3% - still meaningful. The pattern: In this regime and opening-move range, tight strikes are actually balanced. The asymmetry isn't there at ±0.25% or ±0.5% — you're running a roughly symmetric structure. But going wider to "get safer" moves you into a zone where the put is carrying 3–4x the historical exposure of the call at the same distance. --- SPX 5-min 2010–2026. Q3 VIX regime (prior-day close 16–19). Sessions with 0.5–0.7% opening move by 10am: 110 up, 94 down. Touch rate = intraday reach beyond 10am extreme. Reversion = closed back inside by EOD.