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The iShares GNMA Bond ETF (GNMA) is an exchange-traded fund that is based on the Bloomberg U.S. GNMA Bond index. The fund tracks a market-value-weighted index of US mortgage pass-through securities issued by Government National Mortgage Association (GNMA), with 30- or 15-year maturities. GNMA was launched on Feb 14, 2012 and is managed by BlackRock.

The First Trust Low Duration Opportunities ETF (LMBS) is an exchange-traded fund that is based on the Bloomberg U.S. MBS index. The fund is an actively managed fund that invests in a variety of mortgage-backed securities with target duration of less than 3 years. LMBS was launched on Nov 4, 2014 and is managed by First Trust.

iShares MBS ETF (the Fund), formerly iShares Barclays MBS Bond Fund, is an exchange-traded fund (ETF). The Fund seeks investment results, which correspond to the price and yield performance of the Barclays Capital U.S. MBS Index (the Index). The Index measures the performance of investment grade mortgage-backed pass-through securities issued by the Government National Mortgage (GNMA). The Index measures the performance of investment grade mortgage-backed pass-through securities issued by the Government National Mortgage Association (GNMA), Federal National Mortgage Association (FNMA) and Federal Home Loan Mortgage Corporation (FHLMC). The Fund invests in a representative sample of securities included in the Index, which has an investment profile similar to the Index. The investment advisor of the Fund is BlackRock Fund Advisors (BFA).

Vanguard Mortgage Backed Securities ETF (the Fund) seeks to track the performance of a market-weighted, mortgage-backed securities index. The Fund employs a passive management or indexing investment approach designed to track the performance of the Barclays Capital U.S. MBS Float Adjusted Index (the Index). The Index covers the United States agency mortgage-backed, pass-through securities issued by Government National Mortgage Association (GNMA), Federal National Mortgage Association (FNMA) and Federal Home Loan Mortgage Corporation (FHLMC). To be included in the Index, pool aggregates must have at least $250 million outstanding and a weighted average maturity of at least one year. The Fund invests by sampling the Index, meaning that it holds a range of securities that, in the aggregate, approximates the full Index in terms of key risk factors and other characteristics. The Fund's investment advisor is Vanguard Fixed Income Group.