https://volsurfacedesk.com/desk-notes/vanna-charm-second-order-greeks-hedging-flows-spx-25-delta-skew-dealer-opex-pin-risk VolSurface Desk en 2026-10-22T13:11:18.254Z Vanna-Charm Second-Order Greeks Hedging Flows, S&P 500 25-Delta Skew Term Structure & Dealer OpEx Pin Risk Mechanics (2026 Quantitative Desk Manual) https://volsurfacedesk.com/desk-notes/spx-0dte-gamma-exposure-gex-vanna-charm-occ-stans-margin VolSurface Desk en 2026-10-22T08:04:12.739Z SPX 0DTE Gamma Exposure (GEX), Vanna & Charm Hedging Ratios, and OCC STANS Intraday Margin Framework https://volsurfacedesk.com/desk-notes/spx-0dte-gex-dealer-gamma-hedging-and-es-futures-impact VolSurface Desk en 2026-10-22T07:59:17.363Z Cboe SPX 0DTE Options Volume (59% Share) & Dealer Gamma Exposure (GEX): Dealer Delta/Gamma Hedging Equations & E-Mini S&P 500 Futures Impact (59.0% Share of SPX Options Volume Benchmark) https://volsurfacedesk.com/desk-notes/spx-0dte-gex-partial-derivative-formulas-and-surface-grid VolSurface Desk en 2026-10-22T07:44:17.363Z Cboe SPX 0DTE Options Volume (59% Share) & Dealer Gamma Exposure (GEX): Partial Derivative Formulas, Scaling Units & Tenor Surface Grid (59.0% Share of SPX Options Volume Benchmark) https://volsurfacedesk.com/desk-notes/spx-0dte-gex-fomc-and-cpi-event-volatility-crush-math VolSurface Desk en 2026-10-22T07:29:17.363Z Cboe SPX 0DTE Options Volume (59% Share) & Dealer Gamma Exposure (GEX): FOMC & CPI Event Volatility Crush & Forward Variance Decomposition (59.0% Share of SPX Options Volume Benchmark) https://volsurfacedesk.com/desk-notes/spx-0dte-gex-contango-roll-drag-and-term-structure-carry VolSurface Desk en 2026-10-22T07:14:17.363Z 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) https://volsurfacedesk.com/desk-notes/spx-0dte-gex-clearing-margin-monte-carlo-stress-scenarios VolSurface Desk en 2026-10-22T06:59:17.363Z Cboe SPX 0DTE Options Volume (59% Share) & Dealer Gamma Exposure (GEX): Clearinghouse Margin Monte Carlo Scenarios & Intraday Call Triggers (59.0% Share of SPX Options Volume Benchmark) https://volsurfacedesk.com/desk-notes/spx-0dte-gex-strike-skew-convexity-and-butterfly-arbitrage VolSurface Desk en 2026-10-22T06:44:17.363Z Cboe SPX 0DTE Options Volume (59% Share) & Dealer Gamma Exposure (GEX): 25-Delta Strike Skew, Put Wing Convexity & No-Arbitrage Bounds (59.0% Share of SPX Options Volume Benchmark) https://volsurfacedesk.com/desk-notes/spx-0dte-gex-dispersion-correlation-unwind-stress-audit VolSurface Desk en 2026-10-22T06:29:17.363Z Cboe SPX 0DTE Options Volume (59% Share) & Dealer Gamma Exposure (GEX): Correlation Spike Stress Audit & Institutional Dispersion Unwinds (59.0% Share of SPX Options Volume Benchmark) https://volsurfacedesk.com/desk-notes/spx-0dte-gex-350pm-moc-imbalance-and-cash-close-pinning VolSurface Desk en 2026-10-22T06:14:17.363Z Cboe SPX 0DTE Options Volume (59% Share) & Dealer Gamma Exposure (GEX): 3:50 PM ET Market-on-Close (MOC) Imbalance & 4:00 PM Cash Settlement (59.0% Share of SPX Options Volume Benchmark) https://volsurfacedesk.com/desk-notes/vix-futures-term-structure-contango-backwardation-dispersion-skew VolSurface Desk en 2026-10-22T06:04:12.739Z VIX Futures Term Structure (VX1/VX2 Contango vs. Backwardation), VIX1D Benchmarks & Index Dispersion Mechanics https://volsurfacedesk.com/desk-notes/vanna-charm-flows-dealer-gamma-hedging-and-es-futures-impact VolSurface Desk en 2026-10-22T05:59:17.363Z Vanna (dDelta/dVol) & Charm (dDelta/dTime) Second-Order Dealer Hedging: Dealer Delta/Gamma Hedging Equations & E-Mini S&P 500 Futures Impact (6.5 hrs Intraday Cash Decay Window Benchmark) https://volsurfacedesk.com/desk-notes/vanna-charm-flows-partial-derivative-formulas-and-surface-grid VolSurface Desk en 2026-10-22T05:44:17.363Z Vanna (dDelta/dVol) & Charm (dDelta/dTime) Second-Order Dealer Hedging: Partial Derivative Formulas, Scaling Units & Tenor Surface Grid (6.5 hrs Intraday Cash Decay Window Benchmark) https://volsurfacedesk.com/desk-notes/vanna-charm-flows-fomc-and-cpi-event-volatility-crush-math VolSurface Desk en 2026-10-22T05:29:17.363Z Vanna (dDelta/dVol) & Charm (dDelta/dTime) Second-Order Dealer Hedging: FOMC & CPI Event Volatility Crush & Forward Variance Decomposition (6.5 hrs Intraday Cash Decay Window Benchmark) https://volsurfacedesk.com/desk-notes/vanna-charm-flows-contango-roll-drag-and-term-structure-carry VolSurface Desk en 2026-10-22T05:14:17.363Z Vanna (dDelta/dVol) & Charm (dDelta/dTime) Second-Order Dealer Hedging: Constant-Maturity Contango Roll Drag & Backwardation Flip Triggers (6.5 hrs Intraday Cash Decay Window Benchmark) https://volsurfacedesk.com/desk-notes/vanna-charm-flows-clearing-margin-monte-carlo-stress-scenarios VolSurface Desk en 2026-10-22T04:59:17.363Z Vanna (dDelta/dVol) & Charm (dDelta/dTime) Second-Order Dealer Hedging: Clearinghouse Margin Monte Carlo Scenarios & Intraday Call Triggers (6.5 hrs Intraday Cash Decay Window Benchmark) https://volsurfacedesk.com/desk-notes/vanna-charm-flows-strike-skew-convexity-and-butterfly-arbitrage VolSurface Desk en 2026-10-22T04:44:17.363Z Vanna (dDelta/dVol) & Charm (dDelta/dTime) Second-Order Dealer Hedging: 25-Delta Strike Skew, Put Wing Convexity & No-Arbitrage Bounds (6.5 hrs Intraday Cash Decay Window Benchmark) https://volsurfacedesk.com/desk-notes/vanna-charm-flows-dispersion-correlation-unwind-stress-audit VolSurface Desk en 2026-10-22T04:29:17.363Z Vanna (dDelta/dVol) & Charm (dDelta/dTime) Second-Order Dealer Hedging: Correlation Spike Stress Audit & Institutional Dispersion Unwinds (6.5 hrs Intraday Cash Decay Window Benchmark) https://volsurfacedesk.com/desk-notes/vanna-charm-flows-350pm-moc-imbalance-and-cash-close-pinning VolSurface Desk en 2026-10-22T04:14:17.363Z Vanna (dDelta/dVol) & Charm (dDelta/dTime) Second-Order Dealer Hedging: 3:50 PM ET Market-on-Close (MOC) Imbalance & 4:00 PM Cash Settlement (6.5 hrs Intraday Cash Decay Window Benchmark) https://volsurfacedesk.com/desk-notes/occ-stans-margin-dealer-gamma-hedging-and-es-futures-impact VolSurface Desk en 2026-10-22T03:59:17.363Z OCC STANS 20-Minute Intraday Risk Snapshots & 0DTE Margin Add-On: Dealer Delta/Gamma Hedging Equations & E-Mini S&P 500 Futures Impact (20 min Intraday Monte Carlo Interval Benchmark) https://volsurfacedesk.com/desk-notes/occ-stans-margin-partial-derivative-formulas-and-surface-grid VolSurface Desk en 2026-10-22T03:44:17.363Z OCC STANS 20-Minute Intraday Risk Snapshots & 0DTE Margin Add-On: Partial Derivative Formulas, Scaling Units & Tenor Surface Grid (20 min Intraday Monte Carlo Interval Benchmark) https://volsurfacedesk.com/desk-notes/occ-stans-margin-fomc-and-cpi-event-volatility-crush-math VolSurface Desk en 2026-10-22T03:29:17.363Z OCC STANS 20-Minute Intraday Risk Snapshots & 0DTE Margin Add-On: FOMC & CPI Event Volatility Crush & Forward Variance Decomposition (20 min Intraday Monte Carlo Interval Benchmark) https://volsurfacedesk.com/desk-notes/occ-stans-margin-contango-roll-drag-and-term-structure-carry VolSurface Desk en 2026-10-22T03:14:17.363Z OCC STANS 20-Minute Intraday Risk Snapshots & 0DTE Margin Add-On: Constant-Maturity Contango Roll Drag & Backwardation Flip Triggers (20 min Intraday Monte Carlo Interval Benchmark) https://volsurfacedesk.com/desk-notes/occ-stans-margin-clearing-margin-monte-carlo-stress-scenarios VolSurface Desk en 2026-10-22T02:59:17.363Z OCC STANS 20-Minute Intraday Risk Snapshots & 0DTE Margin Add-On: Clearinghouse Margin Monte Carlo Scenarios & Intraday Call Triggers (20 min Intraday Monte Carlo Interval Benchmark) https://volsurfacedesk.com/desk-notes/occ-stans-margin-strike-skew-convexity-and-butterfly-arbitrage VolSurface Desk en 2026-10-22T02:44:17.363Z OCC STANS 20-Minute Intraday Risk Snapshots & 0DTE Margin Add-On: 25-Delta Strike Skew, Put Wing Convexity & No-Arbitrage Bounds (20 min Intraday Monte Carlo Interval Benchmark) https://volsurfacedesk.com/desk-notes/occ-stans-margin-dispersion-correlation-unwind-stress-audit VolSurface Desk en 2026-10-22T02:29:17.363Z OCC STANS 20-Minute Intraday Risk Snapshots & 0DTE Margin Add-On: Correlation Spike Stress Audit & Institutional Dispersion Unwinds (20 min Intraday Monte Carlo Interval Benchmark) https://volsurfacedesk.com/desk-notes/occ-stans-margin-350pm-moc-imbalance-and-cash-close-pinning VolSurface Desk en 2026-10-22T02:14:17.363Z OCC STANS 20-Minute Intraday Risk Snapshots & 0DTE Margin Add-On: 3:50 PM ET Market-on-Close (MOC) Imbalance & 4:00 PM Cash Settlement (20 min Intraday Monte Carlo Interval Benchmark) https://volsurfacedesk.com/desk-notes/vix-vx1-vx2-roll-dealer-gamma-hedging-and-es-futures-impact VolSurface Desk en 2026-10-22T01:59:17.363Z Cboe VIX Futures Term Structure (VX1/VX2 Contango vs. Backwardation): Dealer Delta/Gamma Hedging Equations & E-Mini S&P 500 Futures Impact ($1,000 Standard VX Point Multiplier Benchmark) https://volsurfacedesk.com/desk-notes/vix-vx1-vx2-roll-partial-derivative-formulas-and-surface-grid VolSurface Desk en 2026-10-22T01:44:17.363Z Cboe VIX Futures Term Structure (VX1/VX2 Contango vs. Backwardation): Partial Derivative Formulas, Scaling Units & Tenor Surface Grid ($1,000 Standard VX Point Multiplier Benchmark) https://volsurfacedesk.com/desk-notes/vix-vx1-vx2-roll-fomc-and-cpi-event-volatility-crush-math VolSurface Desk en 2026-10-22T01:29:17.363Z Cboe VIX Futures Term Structure (VX1/VX2 Contango vs. Backwardation): FOMC & CPI Event Volatility Crush & Forward Variance Decomposition ($1,000 Standard VX Point Multiplier Benchmark) https://volsurfacedesk.com/desk-notes/vix-vx1-vx2-roll-contango-roll-drag-and-term-structure-carry VolSurface Desk en 2026-10-22T01:14:17.363Z Cboe VIX Futures Term Structure (VX1/VX2 Contango vs. Backwardation): Constant-Maturity Contango Roll Drag & Backwardation Flip Triggers ($1,000 Standard VX Point Multiplier Benchmark) https://volsurfacedesk.com/desk-notes/vix-vx1-vx2-roll-clearing-margin-monte-carlo-stress-scenarios VolSurface Desk en 2026-10-22T00:59:17.363Z Cboe VIX Futures Term Structure (VX1/VX2 Contango vs. Backwardation): Clearinghouse Margin Monte Carlo Scenarios & Intraday Call Triggers ($1,000 Standard VX Point Multiplier Benchmark) https://volsurfacedesk.com/desk-notes/vix-vx1-vx2-roll-strike-skew-convexity-and-butterfly-arbitrage VolSurface Desk en 2026-10-22T00:44:17.363Z Cboe VIX Futures Term Structure (VX1/VX2 Contango vs. Backwardation): 25-Delta Strike Skew, Put Wing Convexity & No-Arbitrage Bounds ($1,000 Standard VX Point Multiplier Benchmark) https://volsurfacedesk.com/desk-notes/vix-vx1-vx2-roll-dispersion-correlation-unwind-stress-audit VolSurface Desk en 2026-10-22T00:29:17.363Z Cboe VIX Futures Term Structure (VX1/VX2 Contango vs. Backwardation): Correlation Spike Stress Audit & Institutional Dispersion Unwinds ($1,000 Standard VX Point Multiplier Benchmark) https://volsurfacedesk.com/desk-notes/vix-vx1-vx2-roll-350pm-moc-imbalance-and-cash-close-pinning VolSurface Desk en 2026-10-22T00:14:17.363Z Cboe VIX Futures Term Structure (VX1/VX2 Contango vs. Backwardation): 3:50 PM ET Market-on-Close (MOC) Imbalance & 4:00 PM Cash Settlement ($1,000 Standard VX Point Multiplier Benchmark) https://volsurfacedesk.com/desk-notes/vix1d-vix9d-short-dealer-gamma-hedging-and-es-futures-impact VolSurface Desk en 2026-10-21T23:59:17.363Z Cboe 1-Day (VIX1D) & 9-Day (VIX9D) Ultra-Short Volatility Benchmarks: Dealer Delta/Gamma Hedging Equations & E-Mini S&P 500 Futures Impact (1 Day Event Jump Volatility Horizon Benchmark) https://volsurfacedesk.com/desk-notes/vix1d-vix9d-short-partial-derivative-formulas-and-surface-grid VolSurface Desk en 2026-10-21T23:44:17.363Z Cboe 1-Day (VIX1D) & 9-Day (VIX9D) Ultra-Short Volatility Benchmarks: Partial Derivative Formulas, Scaling Units & Tenor Surface Grid (1 Day Event Jump Volatility Horizon Benchmark) https://volsurfacedesk.com/desk-notes/vix1d-vix9d-short-fomc-and-cpi-event-volatility-crush-math VolSurface Desk en 2026-10-21T23:29:17.363Z Cboe 1-Day (VIX1D) & 9-Day (VIX9D) Ultra-Short Volatility Benchmarks: FOMC & CPI Event Volatility Crush & Forward Variance Decomposition (1 Day Event Jump Volatility Horizon Benchmark) https://volsurfacedesk.com/desk-notes/vix1d-vix9d-short-contango-roll-drag-and-term-structure-carry VolSurface Desk en 2026-10-21T23:14:17.363Z Cboe 1-Day (VIX1D) & 9-Day (VIX9D) Ultra-Short Volatility Benchmarks: Constant-Maturity Contango Roll Drag & Backwardation Flip Triggers (1 Day Event Jump Volatility Horizon Benchmark) https://volsurfacedesk.com/desk-notes/vix1d-vix9d-short-clearing-margin-monte-carlo-stress-scenarios VolSurface Desk en 2026-10-21T22:59:17.363Z Cboe 1-Day (VIX1D) & 9-Day (VIX9D) Ultra-Short Volatility Benchmarks: Clearinghouse Margin Monte Carlo Scenarios & Intraday Call Triggers (1 Day Event Jump Volatility Horizon Benchmark) https://volsurfacedesk.com/desk-notes/vix1d-vix9d-short-strike-skew-convexity-and-butterfly-arbitrage VolSurface Desk en 2026-10-21T22:44:17.363Z Cboe 1-Day (VIX1D) & 9-Day (VIX9D) Ultra-Short Volatility Benchmarks: 25-Delta Strike Skew, Put Wing Convexity & No-Arbitrage Bounds (1 Day Event Jump Volatility Horizon Benchmark) https://volsurfacedesk.com/desk-notes/vix1d-vix9d-short-dispersion-correlation-unwind-stress-audit VolSurface Desk en 2026-10-21T22:29:17.363Z Cboe 1-Day (VIX1D) & 9-Day (VIX9D) Ultra-Short Volatility Benchmarks: Correlation Spike Stress Audit & Institutional Dispersion Unwinds (1 Day Event Jump Volatility Horizon Benchmark) https://volsurfacedesk.com/desk-notes/vix1d-vix9d-short-350pm-moc-imbalance-and-cash-close-pinning VolSurface Desk en 2026-10-21T22:14:17.363Z Cboe 1-Day (VIX1D) & 9-Day (VIX9D) Ultra-Short Volatility Benchmarks: 3:50 PM ET Market-on-Close (MOC) Imbalance & 4:00 PM Cash Settlement (1 Day Event Jump Volatility Horizon Benchmark) https://volsurfacedesk.com/desk-notes/index-dispersion-dealer-gamma-hedging-and-es-futures-impact VolSurface Desk en 2026-10-21T21:59:17.363Z S&P 500 Index vs. Single-Stock Implied Correlation & Dispersion Trading: Dealer Delta/Gamma Hedging Equations & E-Mini S&P 500 Futures Impact (+8.5 pts Implied vs. Realized Corr Spread Benchmark) https://volsurfacedesk.com/desk-notes/index-dispersion-partial-derivative-formulas-and-surface-grid VolSurface Desk en 2026-10-21T21:44:17.363Z S&P 500 Index vs. Single-Stock Implied Correlation & Dispersion Trading: Partial Derivative Formulas, Scaling Units & Tenor Surface Grid (+8.5 pts Implied vs. Realized Corr Spread Benchmark) https://volsurfacedesk.com/desk-notes/index-dispersion-fomc-and-cpi-event-volatility-crush-math VolSurface Desk en 2026-10-21T21:29:17.363Z S&P 500 Index vs. Single-Stock Implied Correlation & Dispersion Trading: FOMC & CPI Event Volatility Crush & Forward Variance Decomposition (+8.5 pts Implied vs. Realized Corr Spread Benchmark) https://volsurfacedesk.com/desk-notes/index-dispersion-contango-roll-drag-and-term-structure-carry VolSurface Desk en 2026-10-21T21:14:17.363Z S&P 500 Index vs. Single-Stock Implied Correlation & Dispersion Trading: Constant-Maturity Contango Roll Drag & Backwardation Flip Triggers (+8.5 pts Implied vs. Realized Corr Spread Benchmark) https://volsurfacedesk.com/desk-notes/index-dispersion-clearing-margin-monte-carlo-stress-scenarios VolSurface Desk en 2026-10-21T20:59:17.363Z S&P 500 Index vs. Single-Stock Implied Correlation & Dispersion Trading: Clearinghouse Margin Monte Carlo Scenarios & Intraday Call Triggers (+8.5 pts Implied vs. Realized Corr Spread Benchmark) https://volsurfacedesk.com/desk-notes/index-dispersion-strike-skew-convexity-and-butterfly-arbitrage VolSurface Desk en 2026-10-21T20:44:17.363Z S&P 500 Index vs. Single-Stock Implied Correlation & Dispersion Trading: 25-Delta Strike Skew, Put Wing Convexity & No-Arbitrage Bounds (+8.5 pts Implied vs. Realized Corr Spread Benchmark) https://volsurfacedesk.com/desk-notes/index-dispersion-dispersion-correlation-unwind-stress-audit VolSurface Desk en 2026-10-21T20:29:17.363Z S&P 500 Index vs. Single-Stock Implied Correlation & Dispersion Trading: Correlation Spike Stress Audit & Institutional Dispersion Unwinds (+8.5 pts Implied vs. Realized Corr Spread Benchmark) https://volsurfacedesk.com/desk-notes/index-dispersion-350pm-moc-imbalance-and-cash-close-pinning VolSurface Desk en 2026-10-21T20:14:17.363Z S&P 500 Index vs. Single-Stock Implied Correlation & Dispersion Trading: 3:50 PM ET Market-on-Close (MOC) Imbalance & 4:00 PM Cash Settlement (+8.5 pts Implied vs. Realized Corr Spread Benchmark) https://volsurfacedesk.com/desk-notes/spx-25d-skew-dealer-gamma-hedging-and-es-futures-impact VolSurface Desk en 2026-10-21T19:59:17.363Z 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) https://volsurfacedesk.com/desk-notes/spx-25d-skew-partial-derivative-formulas-and-surface-grid VolSurface Desk en 2026-10-21T19:44:17.363Z 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) https://volsurfacedesk.com/desk-notes/spx-25d-skew-fomc-and-cpi-event-volatility-crush-math VolSurface Desk en 2026-10-21T19:29:17.363Z 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) https://volsurfacedesk.com/desk-notes/spx-25d-skew-contango-roll-drag-and-term-structure-carry VolSurface Desk en 2026-10-21T19:14:17.363Z 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) 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https://volsurfacedesk.com/desk-notes/spx-25d-skew-350pm-moc-imbalance-and-cash-close-pinning VolSurface Desk en 2026-10-21T18:14:17.363Z 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) https://volsurfacedesk.com/desk-notes/vomma-zomma-speed-dealer-gamma-hedging-and-es-futures-impact VolSurface Desk en 2026-10-21T17:59:17.363Z Third-Order & Cross-Vega Greeks: Vomma (Volga), Zomma & Speed Mechanics: Dealer Delta/Gamma Hedging Equations & E-Mini S&P 500 Futures Impact (d²V/dσ² Vega Convexity Derivative Benchmark) https://volsurfacedesk.com/desk-notes/vomma-zomma-speed-partial-derivative-formulas-and-surface-grid VolSurface Desk en 2026-10-21T17:44:17.363Z Third-Order & Cross-Vega Greeks: Vomma (Volga), Zomma & Speed Mechanics: Partial Derivative Formulas, Scaling Units & Tenor Surface Grid (d²V/dσ² Vega Convexity Derivative Benchmark) https://volsurfacedesk.com/desk-notes/vomma-zomma-speed-fomc-and-cpi-event-volatility-crush-math VolSurface Desk en 2026-10-21T17:29:17.363Z Third-Order & Cross-Vega Greeks: Vomma (Volga), Zomma & Speed Mechanics: FOMC & CPI Event Volatility Crush & Forward Variance Decomposition (d²V/dσ² Vega Convexity Derivative Benchmark) https://volsurfacedesk.com/desk-notes/vomma-zomma-speed-contango-roll-drag-and-term-structure-carry VolSurface Desk en 2026-10-21T17:14:17.363Z Third-Order & Cross-Vega Greeks: Vomma (Volga), Zomma & Speed Mechanics: Constant-Maturity Contango Roll Drag & Backwardation Flip Triggers (d²V/dσ² Vega Convexity Derivative Benchmark) https://volsurfacedesk.com/desk-notes/vomma-zomma-speed-clearing-margin-monte-carlo-stress-scenarios VolSurface Desk en 2026-10-21T16:59:17.363Z Third-Order & Cross-Vega Greeks: Vomma (Volga), Zomma & Speed Mechanics: Clearinghouse Margin Monte Carlo Scenarios & Intraday Call Triggers (d²V/dσ² Vega Convexity Derivative Benchmark) https://volsurfacedesk.com/desk-notes/vomma-zomma-speed-strike-skew-convexity-and-butterfly-arbitrage VolSurface Desk en 2026-10-21T16:44:17.363Z Third-Order & Cross-Vega Greeks: Vomma (Volga), Zomma & Speed Mechanics: 25-Delta Strike Skew, Put Wing Convexity & No-Arbitrage Bounds (d²V/dσ² Vega Convexity Derivative Benchmark) https://volsurfacedesk.com/desk-notes/vomma-zomma-speed-dispersion-correlation-unwind-stress-audit VolSurface Desk en 2026-10-21T16:29:17.363Z Third-Order & Cross-Vega Greeks: Vomma (Volga), Zomma & Speed Mechanics: Correlation Spike Stress Audit & Institutional Dispersion Unwinds (d²V/dσ² Vega Convexity Derivative Benchmark) https://volsurfacedesk.com/desk-notes/vomma-zomma-speed-350pm-moc-imbalance-and-cash-close-pinning VolSurface Desk en 2026-10-21T16:14:17.363Z Third-Order & Cross-Vega Greeks: Vomma (Volga), Zomma & Speed Mechanics: 3:50 PM ET Market-on-Close (MOC) Imbalance & 4:00 PM Cash Settlement (d²V/dσ² Vega Convexity Derivative Benchmark) https://volsurfacedesk.com/desk-notes/sabr-svi-surface-dealer-gamma-hedging-and-es-futures-impact VolSurface Desk en 2026-10-21T15:59:17.363Z SABR Stochastic Volatility vs. Gatheral SVI Arbitrage-Free Surface Fitting: Dealer Delta/Gamma Hedging Equations & E-Mini S&P 500 Futures Impact (0.0 bps Butterfly & Calendar Arb Floor Benchmark) https://volsurfacedesk.com/desk-notes/sabr-svi-surface-partial-derivative-formulas-and-surface-grid VolSurface Desk en 2026-10-21T15:44:17.363Z SABR Stochastic Volatility vs. Gatheral SVI Arbitrage-Free Surface Fitting: Partial Derivative Formulas, Scaling Units & Tenor Surface Grid (0.0 bps Butterfly & Calendar Arb Floor Benchmark) https://volsurfacedesk.com/desk-notes/sabr-svi-surface-fomc-and-cpi-event-volatility-crush-math VolSurface Desk en 2026-10-21T15:29:17.363Z SABR Stochastic Volatility vs. Gatheral SVI Arbitrage-Free Surface Fitting: FOMC & CPI Event Volatility Crush & Forward Variance Decomposition (0.0 bps Butterfly & Calendar Arb Floor Benchmark) https://volsurfacedesk.com/desk-notes/sabr-svi-surface-contango-roll-drag-and-term-structure-carry VolSurface Desk en 2026-10-21T15:14:17.363Z SABR Stochastic Volatility vs. Gatheral SVI Arbitrage-Free Surface Fitting: Constant-Maturity Contango Roll Drag & Backwardation Flip Triggers (0.0 bps Butterfly & Calendar Arb Floor Benchmark) https://volsurfacedesk.com/desk-notes/sabr-svi-surface-clearing-margin-monte-carlo-stress-scenarios VolSurface Desk en 2026-10-21T14:59:17.363Z SABR Stochastic Volatility vs. Gatheral SVI Arbitrage-Free Surface Fitting: Clearinghouse Margin Monte Carlo Scenarios & Intraday Call Triggers (0.0 bps Butterfly & Calendar Arb Floor Benchmark) https://volsurfacedesk.com/desk-notes/sabr-svi-surface-strike-skew-convexity-and-butterfly-arbitrage VolSurface Desk en 2026-10-21T14:44:17.363Z SABR Stochastic Volatility vs. Gatheral SVI Arbitrage-Free Surface Fitting: 25-Delta Strike Skew, Put Wing Convexity & No-Arbitrage Bounds (0.0 bps Butterfly & Calendar Arb Floor Benchmark) https://volsurfacedesk.com/desk-notes/sabr-svi-surface-dispersion-correlation-unwind-stress-audit VolSurface Desk en 2026-10-21T14:29:17.363Z SABR Stochastic Volatility vs. Gatheral SVI Arbitrage-Free Surface Fitting: Correlation Spike Stress Audit & Institutional Dispersion Unwinds (0.0 bps Butterfly & Calendar Arb Floor Benchmark) https://volsurfacedesk.com/desk-notes/sabr-svi-surface-350pm-moc-imbalance-and-cash-close-pinning VolSurface Desk en 2026-10-21T14:14:17.363Z SABR Stochastic Volatility vs. Gatheral SVI Arbitrage-Free Surface Fitting: 3:50 PM ET Market-on-Close (MOC) Imbalance & 4:00 PM Cash Settlement (0.0 bps Butterfly & Calendar Arb Floor Benchmark) https://volsurfacedesk.com/desk-notes/ndx-qqq-gamma-dealer-gamma-hedging-and-es-futures-impact VolSurface Desk en 2026-10-21T13:59:17.363Z Nasdaq-100 (NDX) vs. SPX Implied Volatility Spread & Tech Gamma Pinning: Dealer Delta/Gamma Hedging Equations & E-Mini S&P 500 Futures Impact (+4.2 pts VXN over VIX Volatility Spread Benchmark) https://volsurfacedesk.com/desk-notes/ndx-qqq-gamma-partial-derivative-formulas-and-surface-grid VolSurface Desk en 2026-10-21T13:44:17.363Z Nasdaq-100 (NDX) vs. SPX Implied Volatility Spread & Tech Gamma Pinning: Partial Derivative Formulas, Scaling Units & Tenor Surface Grid (+4.2 pts VXN over VIX Volatility Spread Benchmark) https://volsurfacedesk.com/desk-notes/ndx-qqq-gamma-fomc-and-cpi-event-volatility-crush-math VolSurface Desk en 2026-10-21T13:29:17.363Z Nasdaq-100 (NDX) vs. SPX Implied Volatility Spread & Tech Gamma Pinning: FOMC & CPI Event Volatility Crush & Forward Variance Decomposition (+4.2 pts VXN over VIX Volatility Spread Benchmark) https://volsurfacedesk.com/desk-notes/ndx-qqq-gamma-contango-roll-drag-and-term-structure-carry VolSurface Desk en 2026-10-21T13:14:17.363Z Nasdaq-100 (NDX) vs. SPX Implied Volatility Spread & Tech Gamma Pinning: Constant-Maturity Contango Roll Drag & Backwardation Flip Triggers (+4.2 pts VXN over VIX Volatility Spread Benchmark) https://volsurfacedesk.com/desk-notes/ndx-qqq-gamma-clearing-margin-monte-carlo-stress-scenarios VolSurface Desk en 2026-10-21T12:59:17.363Z Nasdaq-100 (NDX) vs. SPX Implied Volatility Spread & Tech Gamma Pinning: Clearinghouse Margin Monte Carlo Scenarios & Intraday Call Triggers (+4.2 pts VXN over VIX Volatility Spread Benchmark) https://volsurfacedesk.com/desk-notes/ndx-qqq-gamma-strike-skew-convexity-and-butterfly-arbitrage VolSurface Desk en 2026-10-21T12:44:17.363Z Nasdaq-100 (NDX) vs. SPX Implied Volatility Spread & Tech Gamma Pinning: 25-Delta Strike Skew, Put Wing Convexity & No-Arbitrage Bounds (+4.2 pts VXN over VIX Volatility Spread Benchmark) https://volsurfacedesk.com/desk-notes/ndx-qqq-gamma-dispersion-correlation-unwind-stress-audit VolSurface Desk en 2026-10-21T12:29:17.363Z Nasdaq-100 (NDX) vs. SPX Implied Volatility Spread & Tech Gamma Pinning: Correlation Spike Stress Audit & Institutional Dispersion Unwinds (+4.2 pts VXN over VIX Volatility Spread Benchmark) https://volsurfacedesk.com/desk-notes/ndx-qqq-gamma-350pm-moc-imbalance-and-cash-close-pinning VolSurface Desk en 2026-10-21T12:14:17.363Z Nasdaq-100 (NDX) vs. SPX Implied Volatility Spread & Tech Gamma Pinning: 3:50 PM ET Market-on-Close (MOC) Imbalance & 4:00 PM Cash Settlement (+4.2 pts VXN over VIX Volatility Spread Benchmark) https://volsurfacedesk.com/desk-notes/vvix-vol-of-vol-dealer-gamma-hedging-and-es-futures-impact VolSurface Desk en 2026-10-21T11:59:17.363Z Cboe VVIX (Volatility of VIX) & Out-of-the-Money VIX Call Convexity: Dealer Delta/Gamma Hedging Equations & E-Mini S&P 500 Futures Impact (96.4 30-Day VVIX Benchmark Benchmark) https://volsurfacedesk.com/desk-notes/vvix-vol-of-vol-partial-derivative-formulas-and-surface-grid VolSurface Desk en 2026-10-21T11:44:17.363Z Cboe VVIX (Volatility of VIX) & Out-of-the-Money VIX Call Convexity: Partial Derivative Formulas, Scaling Units & Tenor Surface Grid (96.4 30-Day VVIX Benchmark Benchmark) https://volsurfacedesk.com/desk-notes/vvix-vol-of-vol-fomc-and-cpi-event-volatility-crush-math VolSurface Desk en 2026-10-21T11:29:17.363Z Cboe VVIX (Volatility of VIX) & Out-of-the-Money VIX Call Convexity: FOMC & CPI Event Volatility Crush & Forward Variance Decomposition (96.4 30-Day VVIX Benchmark Benchmark) https://volsurfacedesk.com/desk-notes/vvix-vol-of-vol-contango-roll-drag-and-term-structure-carry VolSurface Desk en 2026-10-21T11:14:17.363Z Cboe VVIX (Volatility of VIX) & Out-of-the-Money VIX Call Convexity: Constant-Maturity Contango Roll Drag & Backwardation Flip Triggers (96.4 30-Day VVIX Benchmark Benchmark) https://volsurfacedesk.com/desk-notes/vvix-vol-of-vol-clearing-margin-monte-carlo-stress-scenarios VolSurface Desk en 2026-10-21T10:59:17.363Z Cboe VVIX (Volatility of VIX) & Out-of-the-Money VIX Call Convexity: Clearinghouse Margin Monte Carlo Scenarios & Intraday Call Triggers (96.4 30-Day VVIX Benchmark Benchmark) https://volsurfacedesk.com/desk-notes/vvix-vol-of-vol-strike-skew-convexity-and-butterfly-arbitrage VolSurface Desk en 2026-10-21T10:44:17.363Z Cboe VVIX (Volatility of VIX) & Out-of-the-Money VIX Call Convexity: 25-Delta Strike Skew, Put Wing Convexity & No-Arbitrage Bounds (96.4 30-Day VVIX Benchmark Benchmark) https://volsurfacedesk.com/desk-notes/vvix-vol-of-vol-dispersion-correlation-unwind-stress-audit VolSurface Desk en 2026-10-21T10:29:17.363Z Cboe VVIX (Volatility of VIX) & Out-of-the-Money VIX Call Convexity: Correlation Spike Stress Audit & Institutional Dispersion Unwinds (96.4 30-Day VVIX Benchmark Benchmark) https://volsurfacedesk.com/desk-notes/vvix-vol-of-vol-350pm-moc-imbalance-and-cash-close-pinning VolSurface Desk en 2026-10-21T10:14:17.363Z Cboe VVIX (Volatility of VIX) & Out-of-the-Money VIX Call Convexity: 3:50 PM ET Market-on-Close (MOC) Imbalance & 4:00 PM Cash Settlement (96.4 30-Day VVIX Benchmark Benchmark) https://volsurfacedesk.com/desk-notes/variance-swaps-dealer-gamma-hedging-and-es-futures-impact VolSurface Desk en 2026-10-21T09:59:17.363Z Over-the-Counter SPX Variance Swaps vs. Corridor Variance & Vega Notional: Dealer Delta/Gamma Hedging Equations & E-Mini S&P 500 Futures Impact (σ² - K² Variance Payoff Scaling Benchmark) https://volsurfacedesk.com/desk-notes/variance-swaps-partial-derivative-formulas-and-surface-grid VolSurface Desk en 2026-10-21T09:44:17.363Z Over-the-Counter SPX Variance Swaps vs. Corridor Variance & Vega Notional: Partial Derivative Formulas, Scaling Units & Tenor Surface Grid (σ² - K² Variance Payoff Scaling Benchmark) https://volsurfacedesk.com/desk-notes/variance-swaps-fomc-and-cpi-event-volatility-crush-math VolSurface Desk en 2026-10-21T09:29:17.363Z Over-the-Counter SPX Variance Swaps vs. Corridor Variance & Vega Notional: FOMC & CPI Event Volatility Crush & Forward Variance Decomposition (σ² - K² Variance Payoff Scaling Benchmark) https://volsurfacedesk.com/desk-notes/variance-swaps-contango-roll-drag-and-term-structure-carry VolSurface Desk en 2026-10-21T09:14:17.363Z Over-the-Counter SPX Variance Swaps vs. Corridor Variance & Vega Notional: Constant-Maturity Contango Roll Drag & Backwardation Flip Triggers (σ² - K² Variance Payoff Scaling Benchmark) https://volsurfacedesk.com/desk-notes/variance-swaps-clearing-margin-monte-carlo-stress-scenarios VolSurface Desk en 2026-10-21T08:59:17.363Z Over-the-Counter SPX Variance Swaps vs. Corridor Variance & Vega Notional: Clearinghouse Margin Monte Carlo Scenarios & Intraday Call Triggers (σ² - K² Variance Payoff Scaling Benchmark) https://volsurfacedesk.com/desk-notes/variance-swaps-strike-skew-convexity-and-butterfly-arbitrage VolSurface Desk en 2026-10-21T08:44:17.363Z Over-the-Counter SPX Variance Swaps vs. Corridor Variance & Vega Notional: 25-Delta Strike Skew, Put Wing Convexity & No-Arbitrage Bounds (σ² - K² Variance Payoff Scaling Benchmark) https://volsurfacedesk.com/desk-notes/variance-swaps-dispersion-correlation-unwind-stress-audit VolSurface Desk en 2026-10-21T08:29:17.363Z Over-the-Counter SPX Variance Swaps vs. Corridor Variance & Vega Notional: Correlation Spike Stress Audit & Institutional Dispersion Unwinds (σ² - K² Variance Payoff Scaling Benchmark) https://volsurfacedesk.com/desk-notes/variance-swaps-350pm-moc-imbalance-and-cash-close-pinning VolSurface Desk en 2026-10-21T08:14:17.363Z Over-the-Counter SPX Variance Swaps vs. Corridor Variance & Vega Notional: 3:50 PM ET Market-on-Close (MOC) Imbalance & 4:00 PM Cash Settlement (σ² - K² Variance Payoff Scaling Benchmark) https://volsurfacedesk.com/desk-notes/jpm-collar-heqt-dealer-gamma-hedging-and-es-futures-impact VolSurface Desk en 2026-10-21T07:59:17.363Z Institutional Quarterly Equity Collar Rolls & Strike Pinning Microstructure: Dealer Delta/Gamma Hedging Equations & E-Mini S&P 500 Futures Impact ($16.0B+ Quarterly SPX Collar Notional Benchmark) https://volsurfacedesk.com/desk-notes/jpm-collar-heqt-partial-derivative-formulas-and-surface-grid VolSurface Desk en 2026-10-21T07:44:17.363Z Institutional Quarterly Equity Collar Rolls & Strike Pinning Microstructure: Partial Derivative Formulas, Scaling Units & Tenor Surface Grid ($16.0B+ Quarterly SPX Collar Notional Benchmark) https://volsurfacedesk.com/desk-notes/jpm-collar-heqt-fomc-and-cpi-event-volatility-crush-math VolSurface Desk en 2026-10-21T07:29:17.363Z Institutional Quarterly Equity Collar Rolls & Strike Pinning Microstructure: FOMC & CPI Event Volatility Crush & Forward Variance Decomposition ($16.0B+ Quarterly SPX Collar Notional Benchmark) https://volsurfacedesk.com/desk-notes/jpm-collar-heqt-contango-roll-drag-and-term-structure-carry VolSurface Desk en 2026-10-21T07:14:17.363Z Institutional Quarterly Equity Collar Rolls & Strike Pinning Microstructure: Constant-Maturity Contango Roll Drag & Backwardation Flip Triggers ($16.0B+ Quarterly SPX Collar Notional Benchmark) https://volsurfacedesk.com/desk-notes/jpm-collar-heqt-clearing-margin-monte-carlo-stress-scenarios VolSurface Desk en 2026-10-21T06:59:17.363Z Institutional Quarterly Equity Collar Rolls & Strike Pinning Microstructure: Clearinghouse Margin Monte Carlo Scenarios & Intraday Call Triggers ($16.0B+ Quarterly SPX Collar Notional Benchmark) https://volsurfacedesk.com/desk-notes/jpm-collar-heqt-strike-skew-convexity-and-butterfly-arbitrage VolSurface Desk en 2026-10-21T06:44:17.363Z Institutional Quarterly Equity Collar Rolls & Strike Pinning Microstructure: 25-Delta Strike Skew, Put Wing Convexity & No-Arbitrage Bounds ($16.0B+ Quarterly SPX Collar Notional Benchmark) https://volsurfacedesk.com/desk-notes/jpm-collar-heqt-dispersion-correlation-unwind-stress-audit VolSurface Desk en 2026-10-21T06:29:17.363Z Institutional Quarterly Equity Collar Rolls & Strike Pinning Microstructure: Correlation Spike Stress Audit & Institutional Dispersion Unwinds ($16.0B+ Quarterly SPX Collar Notional Benchmark) https://volsurfacedesk.com/desk-notes/jpm-collar-heqt-350pm-moc-imbalance-and-cash-close-pinning VolSurface Desk en 2026-10-21T06:14:17.363Z Institutional Quarterly Equity Collar Rolls & Strike Pinning Microstructure: 3:50 PM ET Market-on-Close (MOC) Imbalance & 4:00 PM Cash Settlement ($16.0B+ Quarterly SPX Collar Notional Benchmark) https://volsurfacedesk.com/desk-notes/sofr-sro-swaptions-dealer-gamma-hedging-and-es-futures-impact VolSurface Desk en 2026-10-21T05:59:17.363Z CME SOFR Options & Interest Rate Swaption Normal (Bachelier) Volatility Grid: Dealer Delta/Gamma Hedging Equations & E-Mini S&P 500 Futures Impact (98.5 bps Annualized Normal Vol (1Y10Y) Benchmark) https://volsurfacedesk.com/desk-notes/sofr-sro-swaptions-partial-derivative-formulas-and-surface-grid VolSurface Desk en 2026-10-21T05:44:17.363Z CME SOFR Options & Interest Rate Swaption Normal (Bachelier) Volatility Grid: Partial Derivative Formulas, Scaling Units & Tenor Surface Grid (98.5 bps Annualized Normal Vol (1Y10Y) Benchmark) https://volsurfacedesk.com/desk-notes/sofr-sro-swaptions-fomc-and-cpi-event-volatility-crush-math VolSurface Desk en 2026-10-21T05:29:17.363Z CME SOFR Options & Interest Rate Swaption Normal (Bachelier) Volatility Grid: FOMC & CPI Event Volatility Crush & Forward Variance Decomposition (98.5 bps Annualized Normal Vol (1Y10Y) Benchmark) https://volsurfacedesk.com/desk-notes/sofr-sro-swaptions-contango-roll-drag-and-term-structure-carry VolSurface Desk en 2026-10-21T05:14:17.363Z CME SOFR Options & Interest Rate Swaption Normal (Bachelier) Volatility Grid: Constant-Maturity Contango Roll Drag & Backwardation Flip Triggers (98.5 bps Annualized Normal Vol (1Y10Y) Benchmark) https://volsurfacedesk.com/desk-notes/sofr-sro-swaptions-clearing-margin-monte-carlo-stress-scenarios VolSurface Desk en 2026-10-21T04:59:17.363Z CME SOFR Options & Interest Rate Swaption Normal (Bachelier) Volatility Grid: Clearinghouse Margin Monte Carlo Scenarios & Intraday Call Triggers (98.5 bps Annualized Normal Vol (1Y10Y) Benchmark) https://volsurfacedesk.com/desk-notes/sofr-sro-swaptions-strike-skew-convexity-and-butterfly-arbitrage VolSurface Desk en 2026-10-21T04:44:17.363Z CME SOFR Options & Interest Rate Swaption Normal (Bachelier) Volatility Grid: 25-Delta Strike Skew, Put Wing Convexity & No-Arbitrage Bounds (98.5 bps Annualized Normal Vol (1Y10Y) Benchmark) https://volsurfacedesk.com/desk-notes/sofr-sro-swaptions-dispersion-correlation-unwind-stress-audit VolSurface Desk en 2026-10-21T04:29:17.363Z CME SOFR Options & Interest Rate Swaption Normal (Bachelier) Volatility Grid: Correlation Spike Stress Audit & Institutional Dispersion Unwinds (98.5 bps Annualized Normal Vol (1Y10Y) Benchmark) https://volsurfacedesk.com/desk-notes/sofr-sro-swaptions-350pm-moc-imbalance-and-cash-close-pinning VolSurface Desk en 2026-10-21T04:14:17.363Z CME SOFR Options & Interest Rate Swaption Normal (Bachelier) Volatility Grid: 3:50 PM ET Market-on-Close (MOC) Imbalance & 4:00 PM Cash Settlement (98.5 bps Annualized Normal Vol (1Y10Y) Benchmark) https://volsurfacedesk.com/desk-notes/portfolio-margin-tims-dealer-gamma-hedging-and-es-futures-impact VolSurface Desk en 2026-10-21T03:59:17.363Z FINRA Rule 4210 Portfolio Margin vs. Reg T Strategy-Based Options Haircuts: Dealer Delta/Gamma Hedging Equations & E-Mini S&P 500 Futures Impact (15.0% Broad-Based Index Stress Range Benchmark) https://volsurfacedesk.com/desk-notes/portfolio-margin-tims-partial-derivative-formulas-and-surface-grid VolSurface Desk en 2026-10-21T03:44:17.363Z FINRA Rule 4210 Portfolio Margin vs. Reg T Strategy-Based Options Haircuts: Partial Derivative Formulas, Scaling Units & Tenor Surface Grid (15.0% Broad-Based Index Stress Range Benchmark) https://volsurfacedesk.com/desk-notes/portfolio-margin-tims-fomc-and-cpi-event-volatility-crush-math VolSurface Desk en 2026-10-21T03:29:17.363Z FINRA Rule 4210 Portfolio Margin vs. Reg T Strategy-Based Options Haircuts: FOMC & CPI Event Volatility Crush & Forward Variance Decomposition (15.0% Broad-Based Index Stress Range Benchmark) https://volsurfacedesk.com/desk-notes/portfolio-margin-tims-contango-roll-drag-and-term-structure-carry VolSurface Desk en 2026-10-21T03:14:17.363Z FINRA Rule 4210 Portfolio Margin vs. Reg T Strategy-Based Options Haircuts: Constant-Maturity Contango Roll Drag & Backwardation Flip Triggers (15.0% Broad-Based Index Stress Range Benchmark) https://volsurfacedesk.com/desk-notes/portfolio-margin-tims-clearing-margin-monte-carlo-stress-scenarios VolSurface Desk en 2026-10-21T02:59:17.363Z FINRA Rule 4210 Portfolio Margin vs. Reg T Strategy-Based Options Haircuts: Clearinghouse Margin Monte Carlo Scenarios & Intraday Call Triggers (15.0% Broad-Based Index Stress Range Benchmark) https://volsurfacedesk.com/desk-notes/portfolio-margin-tims-strike-skew-convexity-and-butterfly-arbitrage VolSurface Desk en 2026-10-21T02:44:17.363Z FINRA Rule 4210 Portfolio Margin vs. Reg T Strategy-Based Options Haircuts: 25-Delta Strike Skew, Put Wing Convexity & No-Arbitrage Bounds (15.0% Broad-Based Index Stress Range Benchmark) https://volsurfacedesk.com/desk-notes/portfolio-margin-tims-dispersion-correlation-unwind-stress-audit VolSurface Desk en 2026-10-21T02:29:17.363Z FINRA Rule 4210 Portfolio Margin vs. Reg T Strategy-Based Options Haircuts: Correlation Spike Stress Audit & Institutional Dispersion Unwinds (15.0% Broad-Based Index Stress Range Benchmark) https://volsurfacedesk.com/desk-notes/portfolio-margin-tims-350pm-moc-imbalance-and-cash-close-pinning VolSurface Desk en 2026-10-21T02:14:17.363Z FINRA Rule 4210 Portfolio Margin vs. Reg T Strategy-Based Options Haircuts: 3:50 PM ET Market-on-Close (MOC) Imbalance & 4:00 PM Cash Settlement (15.0% Broad-Based Index Stress Range Benchmark)