Aggregate Greeks across stocks and option positions while accounting for contract sizes, different underlyings and changing correlations.
Scale each position
Multiply per-share Greeks by signed quantity and the correct contract multiplier. Add stock delta where relevant. Check adjusted, index and futures-option specifications rather than assuming every multiplier is 100.
Normalize different assets
Raw delta across unrelated stocks can mislead. Dollar delta or beta weighting can create a common benchmark, while vega may need normalization by volatility points and maturity.
Stress the portfolio
Net zero exposure can hide offsetting concentrations that break during gaps or correlation changes. Test individual positions, sectors, expirations and broad shocks rather than relying on one total.
A practical example
A portfolio shows near-zero total delta because technology calls offset index puts. A sector-specific rally or correlation break can create losses even though the opening aggregate looked neutral.
This simplified example isolates selected sensitivities so their interaction is easier to understand. Live option prices also reflect the underlying price, time decay, rates, dividends, liquidity and transaction costs. Greeks are theoretical estimates, not guarantees.
Frequently asked questions
Can Greeks across stocks be added?
They can be aggregated after appropriate scaling, but interpretation across underlyings requires care.
What is net vega?
It is the signed first-order sensitivity to an assumed IV-point change across positions.
Does zero net Greek remove risk?
No. Offsetting exposures, curvature, basis and gap risks remain.
Continue the All Greeks in Action cluster
Explore related guides: Option Greeks Scenario Analysis · How Option Greeks Interact · Option Greeks for Debit Spreads. For a structured sequence, use the free Level 8 – All Greeks in Action course.
Options involve risk and are not suitable for every investor. This material is educational and is not investment, tax or legal advice. Greeks are theoretical estimates, and contract terms and broker requirements can vary.