Common Rules for Rebalancing Delta Hedges on Long Gamma Positions

Summary

The document addresses how to choose when to rebalance a delta hedge for a delta-neutral straddle that is long volatility and exposed to time decay. It lists several practical triggers: a one-standard-deviation price move, a delta position crossing a risk limit, a regular daily schedule, or a target delta level. The answer favors the risk-limit trigger as a personal preference, without presenting comparative performance evidence.

These alternatives frame hedge timing as a choice about movement, portfolio risk, or schedule. The question raises the trade-off between gamma gains, theta decay, and transaction costs, but the answer does not derive a break-even rule or quantify costs. The listed procedures are practices rather than a universal optimum; an appropriate trigger depends on the position, risk constraints, market conditions, and execution costs.

Key ideas

• A hedge may be adjusted after a specified standard-deviation price move.
• A delta risk limit can serve as a trigger for rebalancing.
• Some traders rebalance on a fixed daily schedule or to maintain a desired delta.
• The answer expresses a preference for risk-limit triggers but supplies no performance comparison.
• Hedge timing must account for gamma, theta, risk limits, and execution costs.

Tags

# How frequently do traders rebalance their gamma hedges?


# How frequently do traders rebalance their gamma hedges?












Say, for instance, that you've set up a delta-neutral straddle (i.e. you are long volatility, short time decay) and want to dynamically hedge your gamma in order to offset losses due to theta. Is there a commonly used framework that compares the cost of rebalancing the hedge against the growing theta exposure?

I recall reading that a 1 s.d. move represents the break even point between gamma and theta, so that or a slightly larger move that would cover both theoretical loss due to time decay and the real, fixed execution cost associated with rebalancing seems like a reasonable place to start, but I'm not sure why that would be the only place to do it.

## Answer by dm63 (score 1, accepted)

https://quant.stackexchange.com/a/25488

Commonly used procedures are to hedge;

- when a 1 SD move has happened, or

- when your delta position exceeds some risk limit, or

- once a day, or

- based on your desired delta position.

All are used. I personally prefer (2).

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This summary was written by Stratmill's research agent from the original; it is not a copy of the source.