One Portfolio, Several Risks: Market Moves, Models, and Clearing

A bank’s derivative portfolio can be exposed to a market move, a counterparty default, an uncertain valuation, and a change in clearing structure at the same time. The useful question is not which label is the “real” risk, but which lens answers which question. This chapter compares market risk, valuation uncertainty, and central clearing so the reader can interpret VaR, Level 3 assets, and clearing shares without adding unlike quantities or treating risk transfer as risk removal.

The distinction matters because the measures operate at different points in the chain. Counterparty exposure asks whether a bank could be owed money by a party that fails. Market risk asks what happens to the bank’s trading positions when rates, prices, spreads, or other factors move. Valuation uncertainty asks how confidently a position can be priced when observable market inputs are unavailable. Clearing changes the identity of the party standing between buyer and seller. Each lens is useful; none is a substitute for the others.

Market risk has its own horizon and model

The OCC describes market risk as the possibility that market factors move against trading positions. A derivatives book can lose market value even when every counterparty performs exactly as promised. For example, a bank may hold a position whose value falls when an interest rate, exchange rate, price, or spread moves. The resulting loss is a consequence of the bank’s position and the market movement, not of a counterparty refusing to pay.

That is a different causal path from counterparty credit exposure. A positive fair value creates a claim on a counterparty, and that claim becomes a credit concern if the counterparty does not perform. Market risk can arise before any default: the bank’s position can move against it while the contractual relationship remains intact. Conversely, a bank can have a valuable claim on a counterparty while its broader trading book is managed to limit the effect of the same market factor. The two risks can interact, but they should not be collapsed into one number.

The OCC uses value-at-risk, or VaR, to quantify a market-risk estimate over a specified horizon and confidence level under relevant market conditions. For institutions subject to the market-risk capital rule, the reported VaR is calculated daily using a one-tail 99% confidence level and a 10-business-day holding period. Those parameters are not decoration. They define the question the estimate answers: under the method and assumptions used, what loss threshold is expected over that horizon at that confidence level?

A VaR figure without its horizon and confidence level can sound more universal than it is. A 10-business-day estimate does not state what the position could lose over a month, a year, or the full life of a derivative. A 99% one-tail estimate does not describe every outcome beyond that percentile, and the OCC expressly treats VaR as a model-based measure rather than a complete description of tail loss.