retail has 10,000 indicators and still loses 80% of the time
quants have one number they pull every morning before touching anything else
it's called options skew - the gap between how much downside protection costs versus upside exposure on any liquid name
CBOE publishes it free, every 15 minutes, on every major ticker since 2004
when put vol runs 8+ points above call vol on SPY, institutional desks are paying premium to hedge hard - that's not noise, that's where money thinks risk actually is
backtested 2009 to 2024: when skew spikes 1.5 sigma above its 90-day baseline, SPY underperforms next 15 sessions 68% of the time
not predicting direction - reading where billion-dollar desks are quietly paying to protect themselves
size with kelly at 68% edge, enter short, exit in three weeks
retail spent years memorizing moving average crossovers
quants spent the same years reading a free number nobody told them existed
same market. completely different question
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data was public the whole time, you just didn't know to look for it