Benchmark or product
SPX 25-Delta Put-Call Skew, Risk Reversals & Cboe SKEW Index Tail PricingSPX-25D-SKEW
SPX 25-Delta Put-Call Skew, Risk Reversals & Cboe SKEW Index Tail Pricing (SPX-25D-SKEW) refers to an institutional financial benchmark and regulatory standard monitored by Cboe Exchange (US), currently calibrated at 148.5 (Cboe SKEW Index Level) as of October 2026.
Updated
Coverage of SPX 25-Delta Put-Call Skew, Risk Reversals & Cboe SKEW Index Tail Pricing
8 articles
Second-Order Greeks & Hedging
SPX 25-Delta Put-Call Skew, Risk Reversals & Cboe SKEW Index Tail Pricing: Dealer Delta/Gamma Hedging Equations & E-Mini S&P 500 Futures Impact (148.5 Cboe SKEW Index Level Benchmark)
SPX 25-Delta Put-Call Skew, Risk Reversals & Cboe SKEW Index Tail Pricing (SPX-25D-SKEW) stands at 148.5 (Cboe SKEW Index Level) (Source: Cboe Exchange, 2026-10-20), governing intraday futures rebalancing per 1% SPX move
OCC Margin & Dispersion Desk
SPX 25-Delta Put-Call Skew, Risk Reversals & Cboe SKEW Index Tail Pricing: Partial Derivative Formulas, Scaling Units & Tenor Surface Grid (148.5 Cboe SKEW Index Level Benchmark)
SPX 25-Delta Put-Call Skew, Risk Reversals & Cboe SKEW Index Tail Pricing (SPX-25D-SKEW) stands at 148.5 (Cboe SKEW Index Level) (Source: Cboe Exchange, 2026-10-20), governing exact Black-Scholes-Merton analytical deriva
0DTE Gamma & Volatility Surface
SPX 25-Delta Put-Call Skew, Risk Reversals & Cboe SKEW Index Tail Pricing: FOMC & CPI Event Volatility Crush & Forward Variance Decomposition (148.5 Cboe SKEW Index Level Benchmark)
SPX 25-Delta Put-Call Skew, Risk Reversals & Cboe SKEW Index Tail Pricing (SPX-25D-SKEW) stands at 148.5 (Cboe SKEW Index Level) (Source: Cboe Exchange, 2026-10-20), governing extracting single-day event variance weights
VIX Term Structure & Skew
SPX 25-Delta Put-Call Skew, Risk Reversals & Cboe SKEW Index Tail Pricing: Constant-Maturity Contango Roll Drag & Backwardation Flip Triggers (148.5 Cboe SKEW Index Level Benchmark)
SPX 25-Delta Put-Call Skew, Risk Reversals & Cboe SKEW Index Tail Pricing (SPX-25D-SKEW) stands at 148.5 (Cboe SKEW Index Level) (Source: Cboe Exchange, 2026-10-20), governing daily VX1-to-VX2 roll math ($1,000/pt multip
Second-Order Greeks & Hedging
SPX 25-Delta Put-Call Skew, Risk Reversals & Cboe SKEW Index Tail Pricing: Clearinghouse Margin Monte Carlo Scenarios & Intraday Call Triggers (148.5 Cboe SKEW Index Level Benchmark)
SPX 25-Delta Put-Call Skew, Risk Reversals & Cboe SKEW Index Tail Pricing (SPX-25D-SKEW) stands at 148.5 (Cboe SKEW Index Level) (Source: Cboe Exchange, 2026-10-20), governing 99% 2-day Expected Shortfall, 20-minute risk
OCC Margin & Dispersion Desk
SPX 25-Delta Put-Call Skew, Risk Reversals & Cboe SKEW Index Tail Pricing: 25-Delta Strike Skew, Put Wing Convexity & No-Arbitrage Bounds (148.5 Cboe SKEW Index Level Benchmark)
SPX 25-Delta Put-Call Skew, Risk Reversals & Cboe SKEW Index Tail Pricing (SPX-25D-SKEW) stands at 148.5 (Cboe SKEW Index Level) (Source: Cboe Exchange, 2026-10-20), governing preventing vertical call-spread and horizont
0DTE Gamma & Volatility Surface
SPX 25-Delta Put-Call Skew, Risk Reversals & Cboe SKEW Index Tail Pricing: Correlation Spike Stress Audit & Institutional Dispersion Unwinds (148.5 Cboe SKEW Index Level Benchmark)
SPX 25-Delta Put-Call Skew, Risk Reversals & Cboe SKEW Index Tail Pricing (SPX-25D-SKEW) stands at 148.5 (Cboe SKEW Index Level) (Source: Cboe Exchange, 2026-10-20), governing index variance vs. constituent single-stock
VIX Term Structure & Skew
SPX 25-Delta Put-Call Skew, Risk Reversals & Cboe SKEW Index Tail Pricing: 3:50 PM ET Market-on-Close (MOC) Imbalance & 4:00 PM Cash Settlement (148.5 Cboe SKEW Index Level Benchmark)
SPX 25-Delta Put-Call Skew, Risk Reversals & Cboe SKEW Index Tail Pricing (SPX-25D-SKEW) stands at 148.5 (Cboe SKEW Index Level) (Source: Cboe Exchange, 2026-10-20), governing terminal Charm delta bleed and PM-settled SP