Derivatives • Options
Options Greeks & Market Maker Gamma Hedging (0DTE)
Delta, Gamma, Vega, Theta dynamics, positive vs. negative gamma regimes, and how 0DTE options dictate intraday price discovery.
1. The Options Greeks Defined
The price sensitivity of an options contract to underlying market variables is measured by the Options Greeks:
| Greek | Sensitivity Variable | Market Definition |
|---|---|---|
| Delta (\Delta) | Underlying Stock Price | Rate of change of option price per $1 move in underlying asset. |
| Gamma (\Gamma) | Delta Acceleration | Rate of change of Delta per $1 move in underlying asset. |
| Vega ( u) | Implied Volatility | Option price change per 1% change in implied volatility. |
| Theta ( heta) | Time Decay | Option value loss per elapsed calendar day. |
2. Market Maker Gamma Regimes
Market makers who sell options to retail and institutional traders must hedge their directional exposure in the underlying stock/futures market:
- Positive Gamma Regime (Long Gamma): Market makers buy dips and sell rips to re-hedge delta, acting as a volatility dampener that pins prices in narrow trading ranges.
- Negative Gamma Regime (Short Gamma): Market makers must sell when prices fall and buy when prices rise, aggressively accelerating market crashes and melt-ups.
3. The Rise of 0DTE Options
With same-day expiring Zero-Day-to-Expiration (0DTE) options accounting for over 50% of total S&P 500 options volume, Gamma concentration at at-the-money strikes generates massive intraday dealer hedging flows that can reverse or accelerate daily market momentum in minutes.
Track 8: Volatility Surfaces & Systematic Flows
Lesson 2 of 5
Current Lesson in Pathway
2. Options Greeks & Gamma Hedging
Institutional Research Disclaimer: This primer is published by CMD Wire Institutional Research strictly for educational, macroeconomic modeling, and academic reference purposes. It does not constitute investment advice or trading solicitations.