Counterparty exposure measures a defined amount at risk to a legal counterparty under specified valuation, netting and collateral assumptions. A netting set groups trades whose offsets are recognized within the applicable agreement and calculation boundary.

Valuations and eligible aggregation

Individual trades first produce valuations from the selected market data, contractual conventions and model. Aggregation then applies a separate structure: the counterparty entities and eligible netting sets.

A common customer name is not a substitute for that structure. Two trades associated with the same commercial relationship can belong to different legal entities or agreements. Conversely, a supported netting arrangement can connect multiple eligible trades into one calculation set.

The data model therefore affects the result before any advanced risk simulation runs. The engine needs the correct agreement relationship, eligible trade population and version of those relationships for the calculation date.

A netting example with two trades

Take two replacement values, +80 dollars and −60 dollars, from the reporting party’s perspective. Assume the trades belong to one eligible netting set and ignore collateral and other adjustments. Positive net replacement value is max(80 − 60, 0), or 20 dollars.

Now assume the same trades belong to separate non-offsetting sets. The sum of positive replacement values is max(80, 0) + max(−60, 0), or 80 dollars. The negative value in the second set does not offset the positive value in the first under this construction.

The 60-dollar difference comes from the stipulated aggregation boundary, not a changed market price or faster engine. The example assumes eligibility; it does not determine whether an actual agreement is enforceable or prescribe a regulatory capital calculation.

Collateral and settlement state

Collateral adds its own terms and operational state. Eligibility, haircuts, thresholds and other agreement provisions determine how a calculation recognizes a collateral asset. A recorded margin call and a completed collateral transfer are different events.

A collateral workflow needs the exposure calculation, agreement terms, selected assets, instructions and settlement evidence. A dispute can concern the valuation or the call calculation while the settlement system separately records whether assets moved.

Subtracting a requested collateral amount as though it were already available would combine different lifecycle states. The calculation needs an explicit rule for which collateral population and settlement state it recognizes.

Current measures and future exposure

A current positive replacement-value calculation describes a selected valuation point. Potential future exposure uses a defined simulation or other forward-looking method. Its result depends on scenarios, models and aggregation assumptions in addition to today’s marks.

Market risk and counterparty risk also differ. Sensitivity to a market factor does not by itself identify the amount exposed to a legal counterparty. A single pricing library can supply valuations without supplying the complete operating system for agreements, collateral and exposure monitoring.

Scope of a counterparty-risk result

A reproducible result identifies the trade population, valuation time, market-data and model versions, counterparty relationships, netting assumptions and recognized collateral. Changes in any of those inputs can change the result while the trades’ display names remain unchanged.

The numerical example isolates one mechanism: eligible aggregation changes positive replacement value. It leaves legal enforceability, capital treatment, initial-margin methodologies and the suitability of a production model to their separately defined assessments.

Questions about netting set

Can all trades with the same customer name be netted?

No. Recognized offsets depend on the eligible legal entities, agreements and calculation scope.

Does a margin call prove collateral has settled?

No. A call, an instruction and a completed transfer are separate states.

Is positive replacement value a complete measure of counterparty risk?

No. Future exposure, collateral, agreement terms and other model assumptions can require additional analysis.