Vanguard Mortgage-Backed Secs Idx Instl (VMBIX)

Fund Assets	17.10B
Expense Ratio	0.02%
Min. Investment	$5,000,000
Turnover	91.00%
Dividend (ttm)	1.07
Dividend Yield	4.41%
Dividend Growth	1.60%
Payout Frequency	Monthly
Ex-Dividend Date	Oct 1, 2026

Previous Close	24.17
YTD Return	-1.99%
1-Year Return	-1.12%
5-Year Return	0.07%
52-Week Low	23.91
52-Week High	25.91
Beta (5Y)	-0.04
Holdings	4890
Inception Date	May 9, 2012

About VMBIX

Vanguard Mortgage-Backed Securities Index Fund Institutional Shares is a mutual fund that seeks to closely track the performance of a broad, market-weighted index of U.S. mortgage-backed securities. The fund is structured to provide investors with exposure to a diversified pool of mortgage-backed pass-through securities issued predominantly by key government agencies, including the Government National Mortgage Association (GNMA), Federal National Mortgage Association (FNMA), and Federal Home Loan Mortgage Corporation (FHLMC). By following an indexing investment strategy, the fund aims for stability and consistent income while maintaining high credit quality, as its holdings are primarily backed or guaranteed by the U.S. government or government-sponsored enterprises. This fund plays an essential role in many institutional and diversified fixed-income portfolios, as it offers access to the unique risk-return characteristics of the U.S. mortgage market. Its design makes it a key vehicle for investors seeking broad exposure to the mortgage-backed security sector without requiring active management.

• Fund Family: Vanguard
• Category: US Mortgage
• Performance Rating: Average
• Risk Rating: Above Average
• Stock Exchange: Nasdaq
• Ticker Symbol: VMBIX
• Share Class: Institutional Shares
• Index: Bloomberg US MBS Float Adjusted TR USD

Performance

VMBIX had a total return of -1.12% in the past year, including dividends. Since the fund's inception, the average annual return has been 1.84%.

Equivalent ETF

VMBIX has an equivalent ETF with the ticker symbol VMBS, the Vanguard Mortgage-Backed Securities ETF. This is an ETF from the same fund company that follows the same index. It has an expense ratio of 0.03% compared to 0.02% for VMBIX.

Symbol	Name	Expense Ratio
VMBS	Vanguard Mortgage-Backed Securities ETF	0.03%

Other Share Classes

These are alternative share classes of the same fund, from the same provider.

Symbol	Share Class	Expense Ratio
VMBSX	Admiral Shares	0.06%

Dividend History

Ex-Dividend	Amount	Pay Date
Oct 1, 2026	$0.0887	Oct 2, 2026
Sep 1, 2026	$0.0905	Sep 2, 2026
Aug 3, 2026	$0.0913	Aug 4, 2026
Jul 1, 2026	$0.0894	Jul 2, 2026
Jun 1, 2026	$0.0888	Jun 2, 2026
May 1, 2026	$0.0874	May 4, 2026

Data Sources: Tiingo, Twelve Data, and more

Historical data is provided by Tiingo. Delayed stock pricing data is provided by Twelve Data. Several fund data points are also provided by Finnhub.

Last checked:

Oct 15, 2026

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