Source: Board of Governors of the Federal Reserve System (US)  

Release: H.4.1 Factors Affecting Reserve Balances  

Units:  Billions of Dollars, Not Seasonally Adjusted

Frequency:  Weekly, Ending Wednesday

The face value of U.S. Treasury securities lent through the Term Securities Lending Facility (TSLF). This facility was established on March 11, 2008 under the authority of section 13(3) of the Federal Reserve Act. The TSLF is a weekly facility that offers Treasury securities for loan over a one-month term to primary dealers against program-eligible general collateral. The program promotes liquidity in the Treasury security and other collateral markets and thus fosters the functioning of financial markets more generally.