The Federal Reserve, having ended its three-and-a-half-year programme of quantitative tightening on the first of December, has begun acquiring Treasury bills outright at a pace the System's own staff project will reach approximately three hundred and sixty billion dollars over the calendar year. The reserve management purchases, conducted by the Open Market Trading Desk in New York, are designed to maintain bank reserves at what the System describes as an "ample" level, which currently stands at approximately three point four trillion dollars, or eleven per cent of nominal GDP.^{1, 2}

The Fed's total balance sheet, which had peaked at eight point nine seven trillion dollars in April 2022 and fallen to a trough of approximately six point six trillion in late 2025, stood at six point seven trillion as of the eighth of April.² The path is again, gently, ascending. Officials are at considerable pains to insist that the operations do not represent a change in the stance of monetary policy. They are, in the strict sense, correct: the federal funds target range was held at four to four and a quarter per cent at the March meeting,³ and the bill purchases are calibrated to growth in the demand for reserves rather than to a desire to ease financial conditions.

The choice of instrument is consequential. By purchasing only Treasury bills, the Desk preserves the System's portfolio duration and avoids any appearance of supporting longer-dated yields. The Treasury Borrowing Advisory Committee, in its February charge, endorsed the bills-only approach as the most prudent path for restoring an ample reserves position.⁴ The Federal Reserve Bank of St. Louis has separately framed the framework's logic in plain terms: an ample reserves regime "supplies enough reserves to control short-term interest rates primarily through administered rates, rather than through active management of the supply of reserves."⁵

For the Treasury market, the practical implication is that the System Open Market Account is now the largest single source of marginal demand for Treasury bills, with combined demand from reserve management purchases and mortgage-backed security paydown reinvestment projected at approximately five hundred and forty billion dollars for 2026.¹ Whether this collides constructively or otherwise with the Treasury's own intention to continue tilting issuance toward the bill sector will determine, in large part, whether the bill market absorbs the new flows without distortion. The early evidence, the Desk reported on the twenty-sixth of March, has been benign.⁶