Gamma scalping
Gamma scalping is the practice of holding a long option position and repeatedly delta-hedging it, selling the underlying after rises and buying after falls. The hedges lock in gains from price swings, which offset the option's time decay; the strategy profits when realized volatility exceeds the implied volatility paid.
Senzoukria · Glossary · Updated September 2026
At a glance
- Position
- Long options (long gamma), delta-hedged
- Hedging P&L per move
- ≈ ½·Γ·(ΔS)²
- Breakeven
- Realized volatility equal to the implied volatility paid
The mechanism
A long option has positive gamma: as price rises its delta increases, as price falls it decreases. Keeping the position delta neutral therefore requires selling the underlying after a rise and buying it after a fall. Each round trip buys low and sells high, and the gain on a move ΔS is approximately ½·Γ·(ΔS)² per unit of the option. Against that, the option loses theta every day. Gamma scalping is the bet that the swings will be large enough to pay for the decay.
Worked example and breakeven
A 30-day at-the-money option on an underlying at 100, implied volatility 20%, zero rates, has a gamma of 0.0695 and a theta of −0.038 per day. A 2-point move re-hedged at the end of the day earns ½ × 0.0695 × 2² = 0.139, net 0.101 after theta. A 0.5-point day earns 0.009, a net loss of 0.029. The breakeven move is √(2 × 0.038/0.0695) = 1.05 points, which equals 100 × 20% × √(1/365): the daily standard deviation implied by 20% volatility. The strategy wins when the underlying's realized moves exceed what implied volatility priced.
| Move in the underlying | Gamma gain | Theta | Net |
|---|---|---|---|
| 0.5 | +0.009 | −0.038 | −0.029 |
| 1.05 | +0.038 | −0.038 | 0.000 |
| 2.0 | +0.139 | −0.038 | +0.101 |
Why it matters beyond the option desk
The reverse position, short options delta-hedged, sells after falls and buys after rises, earning theta and paying on swings. Gamma exposure models apply this logic to an assumed dealer book: if dealers are net long gamma their hedging leans against moves, if they are net short it follows them. That is the mechanical basis of the dampened and amplified regimes, and it inherits the same uncertainty: nobody publishes who holds which side of each option.
Limits
- Hedge frequency changes the result: trending days reward infrequent hedging, choppy days reward frequent hedging.
- Spreads and fees on each hedge reduce the gamma gain; on futures, tick size and commissions matter.
- Implied volatility can fall while the position is held, adding a vega loss unrelated to realized swings.
- Senzoukria does not run gamma-scalping strategies or place option orders; its GEX and Option Flow modules are analysis tools.
Related
- Gamma (option greek)
- Theta (time decay)
- Delta neutral
- Realized volatility
- Positive gamma regime (dampened)
In the same section
- Gamma squeeze
- Gamma profile
- Gamma wall
- Gamma exposure
- Gap risk
- GEX calculation
- Gambler's fallacy
- Half-open connection
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Frequently asked questions
- Is gamma scalping a way to profit from volatility without predicting direction?
- It is a bet on realized volatility relative to implied volatility, not on direction. It still requires a view: that the underlying will move more than the option's price implies over the holding period, net of costs and of any change in implied volatility.
- Why do dealers not always gamma scalp?
- Dealers mostly hold the positions their clients leave them, long or short gamma, and hedge to manage risk rather than to express a view. When they are net short options, their hedging does the opposite of gamma scalping and loses on large swings.