Cross-collateralised hedging is a risk-management configuration where a single pool of collateral or margin backs offsetting positions spanning multiple asset classes, so that hedges and exposures net against each other under one margin agreement rather than being funded and collateralised in isolation.
How it works
A dealer or fund posts collateral into a single netting set — under an ISDA CSA or a prime broker's portfolio-margin agreement — that spans equities, rates, FX and credit. Margin is computed on the net risk of the combined book, so a hedge in one asset class offsets the collateral demand of an exposure in another, reducing total margin posted but linking the funding of all legs.
Why it matters now
In the 2025-2026 regime of compressed cross-asset correlations and crowded carry, cross-collateralised books amplify deleveraging risk: a correlation break or volatility spike triggers a margin call against the whole netting set at once, forcing simultaneous unwinds across asset classes — the mechanism behind several sharp, self-reinforcing flow reversals.
Example
A relative-value fund runs a long-Treasuries/short-Bund basis trade alongside an equity-index short, all under one prime-broker portfolio-margin account. Because the legs are modelled as partially offsetting, posted margin might be $200m rather than the $500m the legs would require standalone. When the assumed offset breaks — as in the March 2020 dash-for-cash, when Treasuries and risk assets sold off together — the cross-collateralised book faces a margin call on the full gross position simultaneously, forcing liquidation across all asset classes at once.
Frequently asked
- What is cross-collateralised hedging?
- Cross-collateralised hedging is a configuration where one pool of collateral backs offsetting positions across multiple asset classes, so hedges and exposures net under a single margin agreement. It lowers total margin posted by recognising risk offsets, but ties the funding of every leg together — a margin call hits the whole netting set rather than individual positions.
- Why does cross-collateralised hedging matter for systemic risk?
- Cross-collateralised hedging concentrates funding risk because a single margin call can force simultaneous unwinds across equities, rates, FX and credit. When assumed correlations break — as in March 2020 — the netted offsets reverse, collateral demand jumps on the gross book, and the levered holder is forced to liquidate every leg at once, amplifying cross-asset contagion.
- How does cross-collateralised hedging differ from standard hedging?
- Cross-collateralised hedging differs from standard hedging by sharing one collateral pool and margin calculation across asset classes, whereas conventional hedges are collateralised position-by-position. The shared pool reduces posted margin via netting but creates correlated failure modes
Glossary · correlated failure modes
Correlated failure modes are situations where multiple components, institutions, or strategies break simultaneously because they share an underlying dependency — common exposures, shared infrastructure, or identical models — rather than failing independently. The correlation defeats the diversification that the system's risk assumptions presume.
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- What triggers a margin call in a cross-collateralised book?
- A margin call in a cross-collateralised book is triggered when the net risk of the combined portfolio rises — typically from a volatility spike or a breakdown in the correlations the margin model assumed would offset positions. Because margin is computed on net exposure, an unexpected co-movement turns offsetting legs into additive risk, lifting required collateral sharply.