Fed Discount rate + Nov 15th

[tolbiny]

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Of particular interest is the Fed's willingness to accept securities with no market price, including non-AAA-mortgage-backed securities and asset-backed securities, loaning up to 90% of these securities' calculated values

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If I am understanding the rules if the securities that are being used as collateral with the fed are downgraded in value then the loan accepter has to make up the difference quite quickly. Where can I find #s for who has the most in loans from the Fed discount window and what securities back them?