The Federal Reserve Bank of New York released their monthly statistics of the U.S. tri-party repo market for January 2015.
As of January 12, 2015, the total collateral in the U.S. tri-repo market decreased $59.05 billion to $1.579 trillion. Most of the decrease was in U.S. Treasury collateral which decreased $58.78 billion to $582 billion.
The statistics can be found here.
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