Cboe SPX 0DTE Options Volume (59% Share) & Dealer Gamma Exposure (GEX): Constant-Maturity Contango Roll Drag & Backwardation Flip Triggers (59.0% Share of SPX Options Volume Benchmark)
Cboe SPX 0DTE Options Volume (59% Share) & Dealer Gamma Exposure (GEX) (SPX-0DTE-GEX) stands at 59.0% (Share of SPX Options Volume) (Source: Cboe Global Markets, 2026-10-20), governing daily VX1-to-VX2 roll math ($1,000/
