The Federal Reserve Bank of New York released their monthly statistics of the U.S. tri-party repo market for April 2015.
As of April 9, 2015, the total collateral in the U.S. tri-repo market declined by approximately $67 billion to $1.594 trillion. Most of the decrease was in U.S. Treasury collateral which decreased $68 billion to $583 billion. Equity collateral increased by approximately $6.95 billion. Medium margin levels remained stable.
The statistics can be found here.
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