BofA month-end FX rebalancing: USD inflows vs GBP & EUR outflows

Month-end rebalancing signals from the major custodial and bank flow models are a recurring fixture of the FX calendar, typically published in the final sessions of the month and derived from the performance of benchmark equity and bond portfolios. The mechanism is mechanical rather than discretionary: when US assets have outperformed their hedged foreign counterparts, passive managers tracking global benchmarks must sell dollars against the overweight currencies to restore target weights, and vice versa, so the signal direction is largely a function of relative asset returns over the month. A call for dollar inflows against sterling and the euro therefore implies foreign markets have outperformed US ones on the month, requiring dollar buying to rebalance. Flows of this kind tend to cluster around the London fix on the final trading day, and past episodes have shown the effect concentrated in the hour around the fix with partial retracement once the flow clears, though larger-than-usual signals have occasionally left a more lasting imprint when they align with the prevailing trend. The points of divergence worth noting are whether the various bank models agree in direction and magnitude, since they differ in assumed hedge ratios and benchmark composition, and whether month-end falls on a thin liquidity day, which has historically amplified the move at the fix.