When policymakers use trade and technology bans as tools of geopolitics, the fallout is not limited to the targeted foreign firms. Geoeconomic risk—the chance that a company’s valuation falls because a government leverages economic power for strategic aims—now penetrates the heart of many domestic portfolios. Even investors who own only U.S.-listed equities can be exposed, because a large share of American corporations sell to overseas customers or depend on global supply chains.
Domestic equity funds inherit foreign exposure
Our analysis, based on a staff report that tracked U.S. export-control actions from 2014 onward, shows that more than one-fifth of assets in U.S. mutual funds are invested in firms that serve at least one Chinese client. The exposure is especially pronounced in growth-oriented vehicles: science and technology funds allocate roughly 43% of their holdings to companies with Chinese customers, while the average fund sits at 20.3%. When a Chinese firm lands on the export-control blacklist, every U.S. supplier linked to that firm becomes a conduit for the shock, transmitting valuation losses to domestic shareholders.
Export controls generate measurable stock drops
By cross-referencing the Bureau of Industry and Security’s blacklist with FactSet Revere supply-chain data, we identified the U.S. firms directly tied to newly sanctioned Chinese entities. On the day the announcement is made, affected suppliers experience a cumulative abnormal return of about -3.6% over the next five trading days, according to a Fama-French five-factor model. The impact is not isolated; mutual funds that hold these suppliers see their monthly returns dip by roughly 22 basis points for each standard-deviation increase in exposure (about 2.5% of assets).
Fund managers rebalance, but risk pricing persists
Active managers react by trimming positions in the sanctioned suppliers and, intriguingly, also sell other U.S. firms with Chinese links that were not directly targeted. This broader sell-off continues for three months, indicating that managers view the supply-chain link as a lasting source of risk rather than a fleeting news shock. Passive funds, which simply track benchmarks, suffer a similar return decline (about 31 basis points) but also experience outflows of roughly 0.35% of assets in the month following a control event.
Beyond immediate price effects, the market appears to reward investors who tolerate geoeconomic exposure. A long-short strategy that buys firms previously hit by export controls and shorts those untouched generates an abnormal return of about 1% per month after adjusting for standard risk factors. In other words, investors demand a premium for bearing the uncertainty that geopolitical policy can inject into corporate cash flows.
The evidence points to a new dimension of portfolio risk assessment: understanding where a firm earns its revenue and how deeply its supply chain is intertwined with geopolitically sensitive markets. Traditional diversification across domestic stocks may no longer shield investors if many of those stocks share the same foreign exposure. For fund managers, mapping policy-driven shocks onto global value-chain positions is becoming as essential as classic market-timing or stock-picking skills.
