Direct Answer
Speed exposure aggregates option speed, the rate of change of gamma with respect to the underlying price (dGamma/dS, the third derivative d3V/dS3), across open interest. It indicates how quickly aggregate gamma could change as price moves. Larger magnitudes mean aggregate gamma would shift more quickly as price moves, so hedging needs could change faster than the gamma figure alone suggests.
Speed Exposure: Formula, Meaning, Signals, Examples and How to Use It
How Is Speed Exposure Calculated?
Speed exposure aggregates option speed, the rate of change of gamma with respect to the underlying price (dGamma/dS, the third derivative d3V/dS3), across open interest. It indicates how quickly aggregate gamma could change as price moves.
Formula: speed exposure = sum of (sign_i x speed_i x open interest_i x 100); gamma change for a price move dS = speed x dS
Inputs:
- Speed per contract from an option pricing model
- Open interest by strike and expiry
- Contract multiplier (100)
- Assumption about which side dealers hold
Worked example. A strike with speed 0.0002 and 5,000 contracts changes aggregate gamma by 200 shares per $1 for a $2 move in the underlying. The inputs are illustrative numbers, not market data.
Reading it. Larger magnitudes mean aggregate gamma would shift more quickly as price moves, so hedging needs could change faster than the gamma figure alone suggests. It is a third-order effect and mostly of interest near large strikes.
Limits. It is a modeled, dealer-positioning estimate: open interest does not reveal who holds the contracts, and speed depends on the volatility input. It is very sensitive to inputs and is rarely quoted consistently by vendors.
What is Speed Exposure?
Speed exposure aggregates option speed, the rate of change of gamma with respect to the underlying price (dGamma/dS, the third derivative d3V/dS3), across open interest. It indicates how quickly aggregate gamma could change as price moves.
How to use Speed Exposure
Larger magnitudes mean aggregate gamma would shift more quickly as price moves, so hedging needs could change faster than the gamma figure alone suggests. It is a third-order effect and mostly of interest near large strikes. A reading alone is never a buy or sell signal; it needs context from price structure, volume, volatility and the broader market regime.
Strengths
- As the third derivative with respect to spot, it shows how gamma itself would change as price moves, which gamma alone cannot.
- Quoting the gamma change per dollar move gives a number in the same units as gamma, so it can be read against a gamma profile.
- Reproducible when the formula and data convention are fixed.
Weaknesses and limitations
- Speed is small for most contracts away from the money, so the aggregate is dominated by a few near-the-money strikes.
- It is a derivative of a derivative, so a small error in volatility or time inputs is magnified more than it would be for delta or gamma.
- Correlated indicators can create false confidence by repeating the same underlying information.
Editorial and risk note
This page is educational content, not individualized investment advice. It should not imply guaranteed prediction, accuracy or outperformance.
Frequently Asked Questions
Is Speed Exposure a buy or sell signal?
No. Larger magnitudes mean aggregate gamma would shift more quickly as price moves, so hedging needs could change faster than the gamma figure alone suggests. It is a modeled, dealer-positioning estimate: open interest does not reveal who holds the contracts, and speed depends on the volatility input. A trade built on it still needs a trigger, an invalidation rule, a position size and realistic execution assumptions.
What is the best setting for Speed Exposure?
Speed Exposure takes these inputs: speed per contract from an option pricing model; open interest by strike and expiry; contract multiplier (100). There is no universal best setting for the tunable ones, so test them across instruments, regimes and out-of-sample periods and favor stable parameter regions over one historical winner.
Can Speed Exposure be used by itself?
It is a modeled, dealer-positioning estimate: open interest does not reveal who holds the contracts, and speed depends on the volatility input. It is very sensitive to inputs and is rarely quoted consistently by vendors. For that reason it is read next to measures of direction, participation, valuation, liquidity and risk, not alone.
Does Speed Exposure work on every timeframe?
The calculation (speed exposure = sum of (sign_i x speed_i x open interest_i x 100); gamma change for a price move dS = speed x dS) can be run on any bar size, but behavior is not portable: a reading on a five-minute chart describes a very different market window from the same reading on a daily chart. Validate the exact timeframe before relying on it.
Why does Speed Exposure give false signals?
Speed is small for most contracts away from the money, so the aggregate is dominated by a few near-the-money strikes. It is a derivative of a derivative, so a small error in volatility or time inputs is magnified more than it would be for delta or gamma. Lag, noise and regime changes add to this, because market participants react to new information after the reading is calculated.
How should Speed Exposure be backtested?
Rebuild Speed Exposure from speed per contract from an option pricing model using point-in-time data, write the rules before testing, include delisted securities where relevant, model realistic fills and costs, reserve a validation sample and compare with a simpler baseline.