Who this is for — Anyone who needs to state precisely which price, factor or entity a position reacts to without confusing scale, margin and possible loss.
Exposure is a quantified relationship between a position or portfolio and an economic variable: market price, risk factor, currency, issuer or counterparty. The word alone is incomplete. Every number should state its unit, convention, currency, sign, time and scope.
For a linear cash position, a simple convention is signed market value:
E = q × Pwhere quantity and price must use coherent specifications. Futures, options, swaps, bonds and inverse contracts require product-specific multipliers and measures; quantity times price is not a universal formula.
“Exposure” can denote different objects
| Measure | Question | Typical unit |
|---|---|---|
| Market value | what is the position worth now? | currency |
| Notional | what is the contractual scale or reference amount? | currency or contract unit |
| Gross / net | what are absolute scale and signed balance? | one comparable unit or % NAV |
| Beta-adjusted | what is approximate sensitivity to a market? | benchmark equivalent |
| Delta-adjusted | what is the option's local sensitivity to its underlying? | equivalent units or notional |
| Duration / DV01 | how does value respond to an interest-rate move? | time or currency per basis point |
| Scenario | what value change follows a stated shock? | currency or % NAV |
| Counterparty | what current or future value is exposed to default? | currency by netting set and horizon |
These measures are not interchangeable. Notional value describes contractual scale but is not by itself margin, maximum loss or comparable risk across assets. Beta, delta and duration are sensitivities that change with markets, models and horizons.
Exposure is not “risk per trade”
A planned loss at a stop may, in the simplest linear case, be estimated as entry-to-stop distance times quantity. It is a sizing assumption, not a general exposure measure, and does not guarantee an exit price. Gaps, slippage, halts, liquidity, costs and nonlinearities can produce a different loss.
Three trades each sized for a planned 1% loss imply neither “3% exposure” nor exactly 3% aggregate loss. Portfolio assessment needs positions, payoffs, common factors, dependencies and scenarios. Moving a stop to break-even changes the exit plan but does not cancel market exposure or execution uncertainty.
Common mistake — Reporting one total without stating whether it is notional, market value, sensitivity, scenario loss or counterparty exposure. The number is not auditable while its convention remains hidden.
Measurement checklist
- Identify contract, quantity, multiplier and direction.
- Choose the variable against which exposure is measured.
- Align currency and valuation time.
- Keep market value, notional, margin and scenario loss separate.
- At portfolio level, aggregate only comparable quantities and retain gross and net views.
- Revalue after market moves, exercise, expiry, collateral or sensitivity changes.
Sources
- U.S. Securities and Exchange Commission, Division of Economic and Risk Analysis, Use of Derivatives by Registered Investment Companies — comparison of notional-based, delta-adjusted and other exposure measures for derivatives.
- U.S. Commodity Futures Trading Commission, Futures Glossary — Notional Principal — the reference amount used to calculate contractual cash flows, distinct from market value.
- Basel Committee on Banking Supervision, MAR21 — Standardised approach: sensitivities-based method — an institutional example of measuring market risk through separate risk-factor sensitivities.
- Basel Committee on Banking Supervision, CRE51 — Counterparty credit risk overview — distinction between traditional credit exposure and bilateral counterparty exposure that changes over time.