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Sunday, August 23, 2026The Morning Brief →Sign in

Vanguard Mortgage-Backed Securities Index Fund

$46.15-0.19% today
464852-WK

The fund employs an indexing investment approach designed to track the performance of the Bloomberg U.S. MBS Float Adjusted Index. This index covers U.S. agency mortgage-backed pass-through securities issued by the GNMA, the FNMA, and the FHLMC. To be included in the index, pool aggregates must have at least $1 billion 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.

Price & daily flows
47.546.946.446.15DAILY NET FLOWAug 22Dec 19Apr 21Aug 21

SOURCE: MARKET TAPE & DAILY CREATION/REDEMPTION RECORDS · 1Y SHOWN

The desk’s read

Flows are quiet — the past month netted out near zero, while the price has returned -1.9% so far this year. At 0.040% a year, nothing comparable on our shelf runs cheaper.

COMPOSED FROM THE FUND’S OWN DAILY RECORDS · UPDATED WITH EACH REFRESH

$18.6Bassets under management
0.040%expense ratio · $4 per $10,000 a year
net flow, trailing month
1.4Mavg daily volume, 30 days
344holdings · US-domiciled
2009listed November 18, 2009 · beta 0.13
Sector weights
MBS100%
Other100%
Cash & Others100%
Securitized98.59%
Cash1.29%
Miscellaneous0.11%
PORTFOLIO COMPOSITION, LATEST DISCLOSURE
Performance
1 week-0.0%
1 month+0.2%
3 months-0.9%
6 months-2.9%
YTD-1.9%
1 year-0.8%
3 years

PRICE RETURN, DISTRIBUTIONS NOT REINVESTED

Net flows
1 week
1 month
3 months
YTD
1 year

CREATION/REDEMPTION DOLLARS, DAILY RECORDS

Monthly net flows
JulSepOct
DAILY CREATION/REDEMPTION RECORDS, TRAILING TWELVE MONTHS
The risk read
5%realized volatility, 30 days (annualized)
4%realized volatility, 1 year
-3.8%deepest fall from a peak, 1 year
-3.6%where it sits vs. that peak today

VOLATILITY & DRAWDOWN FROM THE DAILY TAPE · CONCENTRATION FROM THE LATEST DISCLOSED BOOK

Options tape
calls today
2puts today
put/call ratio
957Kshares traded
InstrumentsHarvest substitutesTrade cost at $1MClient tearsheetStress this fund
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