The Gross Position Value (GPV) check is a risk management tool used by Interactive Brokers that can limit your trading activity, even when you have offsetting positions. Here is how it works and why it may be more restrictive than you might expect:
- Calculation Method:
- The GPV check considers the absolute value of all positions in your account.
- Both long and short positions are included in the calculation.
- Economically offsetting positions are counted separately, rather than being netted out.
- Example:
- If you have $10 million in long options and $11 million in short options, the GPV would be calculated as $21 million.
- This is despite the fact that the net exposure is only $1 million.
- Purpose:
- This approach is designed to limit overall position size and leverage in your account.
- It helps manage the total risk exposure, regardless of how positions may offset each other.
- Comparison to Other Calculations:
- The GPV check may be more restrictive than other margin calculations you are familiar with.
- While other risk measures might consider the netting effect of offsetting positions, the GPV check does not.
- Impact on Trading:
- Due to its conservative nature, the GPV check may limit your trading more than you might expect based on your net exposure.
- This can be frustrating if you are using strategies that rely on offsetting positions to manage potential risk.
- Risk Management Perspective:
- While it may seem overly restrictive, this approach is implemented to manage overall account risk.
- It provides an additional layer of protection against extreme market events where correlations between offsetting positions might break down.