In line with the FOMC’s directives, SOMA holdings of Treasuries and agency MBS decreased by $924 billion during 2023. The runoff of SOMA securities, which make up 94 percent of Federal Reserve assets, drove the overall decrease in the balance sheet.
Treasury and agency MBS runoff continued to be guided by redemption caps set by the FOMC of $60 billion and $35 billion per month, respectively. Zooming in on Treasury securities (in light blue) shows that holdings declined from $5.5 trillion to $4.8 trillion, with redemptions of Treasury coupon and bill securities contributing to about 77 percent of total SOMA runoff in 2023.
Zooming in further, agency MBS holdings (in bright blue) fell from $2.6 trillion to $2.4 trillion, or about 23 percent of total SOMA runoff during the year. Principal payments averaged $17.5 billion per month in 2023, well below the monthly redemption cap of $35 billion.