A US shock returns through European financial plumbing

A US asset can lose value without causing a European crisis. Transmission starts only when the loss becomes a need for cash: fund redemptions, collateral to deliver, a derivative to margin or bank funding to roll. It intensifies if several funds sell at the same time and the banks financing them shrink their balance sheets. The risk does not lie in an Irish or Luxembourg address by itself. It lies in the chain connecting a global portfolio, a vehicle domiciled in Europe and European banks. That chain is documented. Its full activation is not.

This is the third instalment in the “€12 trillion in transit” series. The first mapped the distinction between domicile, manager, investor, currency and issuer. The second followed capital into US securities. This article takes the route in reverse.

A valuation loss is not yet a liquidity crisis

In the second quarter of 2025, euro area residents held about €6.1 trillion in US securities, according to the ECB’s November 2025 Financial Stability Review. Investment funds accounted for 75% of this population’s US equities, almost 50% of its US sovereign debt and about 60% of its other US debt.

A correction in those assets lowers their euro value and the NAV of the funds holding them. If investors stay put, the fund has no leverage and its derivatives require no collateral, the loss remains primarily a portfolio loss. A second event is needed for systemic risk: a cash outflow.

In an open-ended fund, redemption requests require the manager to mobilise liquidity. It can use cash, sell money-market instruments, reduce a repo position or sell securities. The order depends on the mandate, the assets and market conditions. There is no universal liquidation waterfall.

The May 2026 Financial Stability Review estimates that cash represented about 4% of euro area bond fund assets in the first quarter of 2026, compared with about 2% for equity funds. During the April 2025 tariff turmoil, outflows from high-yield funds exceeded their average cash buffers. The ECB says this indicates that they may have resorted to precautionary or forced sales. The observation applies neither to every fund nor to every US equity. It documents the link from redemption to sale. Our analysis of bond funds’ liquidity buffer examines that first line of defence.

FX hedging changes both the loss and its cash timing

The dollar adds a second axis to the shock. The ECB estimates that euro area investment funds and insurance corporations hedge only about one-third of the currency risk in their US dollar bond portfolios. For funds, gross FX derivative notional represented less than 10% of dollar assets in equity funds and 55% in bond funds in the second quarter of 2025. The ECB warns that gross notionals mix long and short positions and cannot reliably reconstruct net hedging.

A simultaneous decline in a US asset and the dollar amplifies the euro loss of an unhedged investor. For a fund hedged by selling dollars forward, the dollar’s decline instead creates a gain on the hedge that offsets some or all of the FX loss. A margin call is therefore not automatic in this scenario.

The cash strain can emerge in the opposite configuration. If the dollar rises, the asset’s euro value cushions part of the correction, but a short-dollar hedge can lose and require cash or collateral. The outcome depends on the contract, clearing, netting agreements and margin thresholds. The margin call definition preserves the distinction between the final economic loss and cash that must be delivered immediately.

Maturity creates a separate vulnerability regardless of the currency’s direction. Long-lived foreign-currency assets are often hedged with shorter FX derivatives that must be rolled. The ECB identifies a liquidity mismatch: when FX markets are strained, rolling becomes more expensive and a fund may have to choose between selling a foreign asset and retaining more currency risk. This is the mechanism behind the cross-currency basis and our guide to dollar liquidity.

Bank balance sheets form the European bridge

Funds and other non-bank financial intermediaries (NBFIs) deposit cash with banks, lend to them through repo, buy their bonds and borrow to obtain leverage or market access. The joint ECB-ESRB report released on 12 February 2026 isolates two systemic channels.

The first runs through bank liabilities. The ECB’s detailed study estimates that euro area banks fund, on average, 15% of their assets through liabilities to NBFIs. About 60% of those liabilities are very short-term deposits and repos. A fund facing redemptions or margin calls may withdraw a deposit or decline to roll a repo. The bank then loses funding that may be hard to replace quickly.

The second runs through bank assets. Euro area banks’ exposures to NBFIs amount to about 10% of their total assets. Much of this credit is collateralised and short-dated, which reduces direct credit risk. But a bank can raise a haircut, refuse to roll funding or reduce the leverage supplied to a counterparty. If the fund then sells into a falling market, collateral values decline further and deleveraging can reinforce itself. This is the secured-funding logic explained in our repo and SOFR guide.

The relationship also operates at longer maturities. In June 2025, euro area NBFIs held about €1.5 trillion in bank bonds, close to one-third of the amount outstanding. The ECB notes that this funding, held prominently by insurers and pension funds and spread over long maturities, presents limited immediate liquidity risk. A prolonged loss of bond-market access would matter more than a one-day sale.

These figures cannot be added together. They use different denominators, instruments and populations. Nor do they imply that 10% of bank balance sheets finances Irish or Luxembourg funds. They establish the interconnection between euro area banks and the broader non-bank sector.

Three conditions make the loop procyclical

The scenario becomes systemic only if three conditions combine.

1. Outflows are synchronised. Several funds face redemptions or seek the same collateral at the same time.
2. Buffers cannot absorb the need. Cash, liquid assets and available lines are insufficient, forcing sales.
3. Banks reduce intermediation together. They replace less withdrawn funding, tighten repo, provide less leverage or shrink market-making capacity.

The ESRB’s EU Non-bank Financial Intermediation Risk Monitor 2025 describes precisely this combination of liquidity mismatch, leverage and interconnectedness. It does not find every open-ended fund fragile. It identifies pockets of risk, notably among funds making heavy use of derivatives, some absolute-value-at-risk UCITS and hedge funds. NBFI must never be treated as one homogeneous balance sheet.

Buffers keep the scenario from becoming a forecast

Listed equities and Treasuries are generally easier to sell than private credit or thinly traded bonds. Collateralised bank exposures limit losses in default. Long-term bank bonds held by insurers and pension funds do not all flee on day one. Funds can hold cash, stagger sales, use liquidity-management tools and reduce hedges instead of immediately liquidating assets.

In February 2026, the ECB and ESRB wrote that bank-NBFI linkages did not then pose acute risks to financial stability, while creating vulnerabilities that could amplify stress. That is the appropriate conclusion here. The channel exists, its scale is significant and some connections are concentrated. Nothing in the public evidence reviewed supports a claim that a crash is imminent.

The thesis is falsifiable. A US correction accompanied by contained redemptions, absorbed margin calls, stable NBFI deposits and a functioning bank repo market would remain mainly a portfolio loss. Synchronised outflows, forced sales, withdrawals of short-term funding and rising haircuts would instead show that the plumbing is transmitting the shock.

The fourth instalment examines the fragmented supervision of this chain when the fund, manager, investor, asset and bank fall under several jurisdictions.

Sources

1. ECB, “What safe haven after the April US tariff announcement?”, Financial Stability Review, November 2025: US holdings, FX hedging and the maturity mismatch in derivatives.
2. ECB, Financial Stability Review, May 2026: cash buffers, redemptions and procyclical fund sales.
3. ECB, “Systemic risks in linkages between banks and the non-bank financial sector”, November 2025: bank funding, exposures and bank bonds held by NBFIs.
4. ECB and ESRB, press release on bank-NBFI linkages, 12 February 2026: two transmission channels and the current risk assessment.
5. ESRB, EU Non-bank Financial Intermediation Risk Monitor 2025: liquidity, leverage, margin calls and fund heterogeneity.
6. FSB, Liquidity Preparedness for Margin and Collateral Calls, 10 December 2024: cash management, stress testing and collateral availability. This is not investment advice.