S&P U.S. Mortgage-Backed Securities Index

The S&P U.S. Mortgage-Backed Securities Index is a rules-based, market-value-weighted index covering U.S. dollar-denominated, fixed-rate and adjustable-rate/hybrid mortgage pass-through securities issued by Ginnie Mae (GNMA), Fannie Mae (FNMA) and Freddie Mac (FHLMC).

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