MBS and Mortgage Investor Activity
GSE Mortgage Securities Holdings
Yearly data for each GSE availalbe 2004-1Q12 and quarterly for 2011-2012. Columns include total retained portfolio split into MBS and mortgages subcategories along with market share, amount of own and the other agency's MBS held, and total non-agency MBS split into subprime, Alt A, and CMBS subcategories.





