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Questions tagged [gamma]

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gamma-weighted SOIR

I came across a term 'gamma-weighted SOIR' several times recently. it seem like an old term on gamma imbalance. could someone care to explain what this is and the rationale behind it?
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1k views

Short Call Hedge. Options and gamma trading

Let’s say a trader sells a Short Call with strike 100 (for making profit with the premium) at-the-money (for highest extrinsic value there). For hedging until expiration, he buys the underlying share ...
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0answers
69 views

Stress Test for gamma FX portfolios?

How can I create scenarios to stress gamma FX portfolios? If I shock the underlying for example +/-10%, then I gain in both scenarios. I get to capture some losses if I shock the implied volatility. ...
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1answer
715 views

Interpretation of an option gamma larger than one

I am working on an option hedging simulation. In this context, I wanted to expand the simulation to include gamma. For testing purposes, I used among others the natural gas futures. When I calculate ...
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1answer
57 views

Known future volatility and difficulty in predicting final P/L

I have started Chapter 1 of Dynamic Hedging by Taleb and it starts by saying "Even if traders knew the exact future volatility but hedged themselves (rebalanced the gamma) at discretely spaced ...
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1answer
306 views

Delta-Gamma VaR question on inputs (do I need only one delta or the delta for the past 500 days?)

When calculating a VaR using the Delta-Gamma approach, I am supposed to use this formula: ∆(V) = Delta * ∆(X) + 0.5 * Gamma * ∆(X)² where: ∆(V) = change in value of the asset in portfolio ∆(X) = ...
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1answer
202 views

If you have a delta-hedged position and you're short gamma, why are spot price movements bad?

I simply can't wrap my head around the concept of Gamma. I've read multiple sites and explanations and for some reason can't wrap my head around the logic, so I feel that it'll really help for me to ...
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1answer
112 views

In this scenario could gamma be higher for OTM options?

Let's say there is a $1 stock, with say 1 day to expiration. The 1.5 strike call, is probably a 0 delta at this point; however, a 1 point increase would mean the stock would be at trading at 2 dollars;...
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1answer
1k views

Compute cross-gamma

I am trying to use delta-gamma method with montecarlo simulations to calculate the VAR of a portfolio consisting in options and equities. To use the method I need to compute a gamma matrix, that has ...
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1answer
389 views

Bucketed gamma for swaptions

For a long 7Y1Y payer swaption, I understand that the overall gamma will be positive. I see gamma to be positive in 7Y tenor and negative in 8Y - why would that be the case? Intuitively, how would ...