U.S. and Foreign Corporate Fixed Maturity Securities. We maintain a diversified portfolio of corporate fixed maturity securities across industries and issuers. This portfolio does not have an exposure to any single issuer in excess of 1% of total investments and the top ten holdings comprise 2% of total investments at both December 31, 2012 and 2011. The tables below present information for U.S. and foreign corporate securities at: (1) Includes both U.S. dollar and foreign denominated securities. Structured Securities. We held $72.6 billion and $74.7 billion of structured securities, at estimated fair value, at December 31, 2012 and 2011, respectively, as presented in the RMBS, CMBS and ABS sections below. RMBS . The table below presents information about RMBS at: Collateralized mortgage obligations are a type of mortgage-backed security structured by dividing the cash flows of mortgages into separate pools or tranches of risk that create multiple classes of bonds with varying maturities and priority of payments. Pass-through mortgage-backed securities are a type of asset-backed security that are secured by a mortgage or collection of mortgages. The monthly mortgage payments from homeowners pass from the originating bank through an intermediary, such as a government agency or investment bank, which collects the payments and, for a fee, remits or passes these payments through to the holders of the pass-through securities. The majority of RMBS we hold are Agency RMBS. The majority of our RMBS holdings were rated Aaa/AAA by Moody’s, S&P or Fitch; and were rated NAIC 1 by the NAIC at December 31, 2012 and 2011. Agency RMBS were guaranteed or otherwise supported by Federal National Mortgage Association, Federal Home Loan Mortgage Corporation or GNMA. Non-agency RMBS include prime, Alt-A and sub-prime RMBS. Prime residential mortgage lending includes the origination of residential mortgage loans to the most creditworthy borrowers with high quality credit profiles. Alt-Aisa classification of mortgage loans where the risk profile of the borrower falls between prime and sub-prime. Sub-prime mortgage lending is the origination of residential mortgage loans to borrowers with weak credit profiles. Included within prime and Alt-A RMBS are resecuritization of real estate mortgage investment conduit (“Re-REMIC”) securities. Re-REMIC RMBS involve the pooling of previous issues of prime and Alt-A RMBS and restructuring the combined pools to create new senior and subordinated securities. The credit enhancement on the senior tranches is improved through the resecuritization. At December 31, 2012 and 2011, our Alt-A securities portfolio had no exposure to option adjustable rate mortgages (“ARMs”) and a minimal exposure to hybrid ARMs. Our Alt-A securities portfolio was comprised primarily of fixed rate mortgages (94% and 93% at December 31, 2012 and 2011, respectively) which have performed better than both option ARMs and hybrid ARMs in the overall Alt-A market. 41 MetLife, Inc. December 31, 2012 2011 Estimated Fair Value %of Total Estimated Fair Value %of Total (In millions) (In millions) Corporate fixed maturity securities — by sector: Foreign corporate(1) ................................................ $ 67,184 37.1% $ 64,018 37.7% U.S. corporate fixed maturity securities — by industry: ........................ Consumer ........................................................ 29,852 16.4 26,739 15.7 Industrial ......................................................... 29,324 16.2 26,962 15.9 Finance .......................................................... 21,857 12.1 20,854 12.3 Utility ............................................................ 20,216 11.1 19,508 11.5 Communications ................................................... 9,084 5.0 8,178 4.8 Other ............................................................ 3,793 2.1 3,544 2.1 Total .......................................................... $181,310 100.0% $169,803 100.0% December 31, 2012 2011 Estimated Fair Value %of Total Net Unrealized Gains (Losses) Estimated Fair Value %of Total Net Unrealized Gains (Losses) (In millions) (In millions) (In millions) (In millions) By security type: Collateralized mortgage obligations .......... $20,567 54.9% $ 889 $ 23,392 54.9% $ (341) Pass-through securities ................... 16,912 45.1 924 19,245 45.1 886 Total RMBS .......................... $37,479 100.0% $ 1,813 $ 42,637 100.0% $ 545 By risk profile: Agency ............................... $26,369 70.4% $ 1,944 $ 31,055 72.8% $ 2,074 Prime ................................. 4,206 11.2 101 5,959 14.0 (310) Alt-A .................................. 4,950 13.2 (154) 4,648 10.9 (872) Sub-prime ............................. 1,954 5.2 (78) 975 2.3 (347) Total RMBS .......................... $37,479 100.0% $ 1,813 $ 42,637 100.0% $ 545 Ratings profile: Rated Aaa/AAA ......................... $26,555 70.9% $ 31,690 74.3% Rated NAIC 1 ........................... $32,377 86.4% $ 36,699 86.1%