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

Release: H.4.1 Factors Affecting Reserve Balances  

Units:  Billions of U.S. Dollars, Not Seasonally Adjusted

Frequency:  Weekly, Ending Wednesday

This item indicates the value of securities lent to primary dealers. The loans are awarded based on competitive bidding in a daily auction. A minimum bid rate is imposed to limit borrowing to securities that are in high demand or "on special.