Level from the H.4.1 Federal Reserve statistical release, table 4 Information on Principal Accounts of Maiden Lane LLC, sum of Outstanding principal amount of loan extended by the Federal Reserve Bank of New York and Accrued interest payable to the Federal Reserve Bank of New York. While data is released weekly (Wednesday), we use only quarter end dates. Series was zero before 2008:Q1. Unadjusted flow is the change in the level; data for the most recent ten years show no significant seasonality.