Market data showed the effective fed funds rate rose to 4.09%, just a basis point higher than the 4.08% registered after the Fed’s September 16–17 policy meeting. While the rate remains firmly within the central bank’s 4.00%–4.25% target range, the uptick drew attention because it marked the first increase outside a Fed policy move since 2023.
At the heart of the adjustment lies the balance sheet activity of foreign banking organizations (FBOs), which are among the biggest borrowers in the roughly $100 billion fed funds market. Analysts said that a combination of quarter-end balance sheet constraints and declining reserve levels at these institutions played a decisive role.
Foreign Bank Reserves Under Pressure
Recent Fed data show that FBOs’ cash balances—a proxy for reserves—have fallen sharply. Their holdings stood at $1.176 trillion as of September 17, down $28 billion in a week and a hefty $255 billion decline since late August. Overall, systemwide bank reserves slipped to $3 trillion from $3.3 trillion just weeks earlier, according to the New York Fed’s Liberty Street Economics.
Because FBOs lack access to U.S. insured deposits or Federal Home Loan Bank advances, their funding structures tend to be less stable. “They don’t have access to FHLB advances and they don’t have an insured deposit base so their funding tends to be less stable and therefore they like to maintain thicker liquidity cushions,” explained Joseph Abate, head of rates at SMBC Nikko Securities.
The tighter liquidity has also reduced fed funds market activity. Average daily trading volume has slipped from $113 billion earlier this year to about $94–95 billion in mid-September.
Arbitrage and Balance-Sheet Costs
One wrinkle in the current setup is arbitrage. FBOs often borrow in fed funds from Federal Home Loan Banks at about 4.09% and redeposit the cash at the Fed for 4.15%, earning a small spread through the interest on reserve balances (IORB). Domestic banks, by contrast, largely avoid this practice because it expands their balance sheets and triggers leverage and liquidity coverage ratio (LCR) costs, often wiping out any profit.
Quarter-End Dynamics
The timing of the reserve drawdown is notable. Analysts said some decline was expected as quarter-end approached, when large banks and dealers typically reduce activity to manage regulatory capital requirements. However, this cycle’s drop began weeks earlier, suggesting a deeper shift, including moves into repo markets and balance-sheet deleveraging.
Repo rates—the cost of borrowing cash overnight against Treasuries—are also firming ahead of quarter-end, reinforcing funding pressures. “While some of this decline reflects a shift into alternative front-end investments like repos, the bulk could be attributed to deleveraging in the balance sheets of foreign banks,” noted Lou Crandall, chief economist at Wrightson ICAP.
Market Reaction
The uptick in fed funds has spilled into the futures market. Open interest in fed funds futures at the CME hit a record last week, topping three million contracts, a sign traders are bracing for tighter quarter-end funding conditions. A large block trade of 30,000 October contracts was also executed, underscoring hedging activity tied to short-term rates.
Despite the stir, many observers stressed that the move was more about financial plumbing than monetary policy. Josh Barone, wealth manager at Savvy Advisors, summed it up: “The fed funds blip was all about plumbing, not policy,” echoing the view that quarter-end balance sheet dynamics rather than Fed intent were behind the adjustment.