ETF Spotlight on iShares Barclays MBS Bond Fund (NYSEArca: MBB), part of an ongoing series.

Assets: $5.9 billion.

Objective: The iShares Barclays MBS Bond Fund tries to reflect the performance of the Barclays U.S. MBS Index, which tracks investment grade agency mortgage-backed securities sector of the U.S.

Holdings: Mortgage-backed securities.