The investment seeks to track the performance of a market-weighted mortgage-backed securities index. The fund employs an indexing investment approach designed to track the performance of the Barclays U.S. MBS Float Adjusted Index. This index covers U.S. agency mortgage-backed pass-through securities. To be included in the index, pool aggregates must have at least $250 million currently outstanding and a weighted average maturity of at least 1 year. All of the fund's investments will be selected through the sampling process, and at least 80% of the fund's assets will be invested in bonds included in the index.
Fund filings (PDF) »

Asset managers:
Joshua Barrickman (Started: Feb 22, 2013)
William Baird (Started: Nov 19, 2009)

Advisor Company:
Vanguard Group, Inc.
Fund family reports on Morningstar »

	1 year	3 years	5 years	10 years
Alpha*	-0.06	1.09	-	-
Beta*	0.46	0.53	-	-
Mean annual return	0.14	0.33	-	-
R-squared*	63.29	58.94	-	-
Standard deviation	1.13	1.68	-	-
Sharpe ratio	1.39	2.33	-	-
* Against standard index

Risk measurement details »

Security	Net Assets
Fannie Mae Single Family TBA 3.5% 2043-04-01	2.46%
Fannie Mae Single Family TBA 3% 2043-04-01	2.26%
Ginnie Mae Jumbos TBA 4.5% 2043-04-01	1.77%
FHLMC 3.5%	1.73%
Fannie Mae Single Family TBA 3% 2028-04-01	1.43%
Freddie Mac Gold Single Family TBA 4% 2043-04-01	1.40%
Fannie Mae Single Family TBA 4.5% 2043-04-01	1.34%
Govt Natl Mtg Asso 4.5%	1.29%
Ginnie Mae Jumbos TBA 3% 2043-04-01	1.21%
Fannie Mae Single Family TBA 2.5% 2028-04-01	1.18%

Holdings Performance »