iShares MBS ETF

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About MBB

MBB tracks a market-weighted index of investment-grade mortgage pass-through securities. The index includes fixed and floating rate securities issued by GNMA, FNMA and FHLMC. 

Index-Tracked
BBgBarc US Universal TR USD
Index-TrackedBBgBarc US Universal TR USD
Category
Government Mortgage-Backed Bond
CategoryGovernment Mortgage-Backed Bond
Number of holdings
11,169
Number of holdings11,169
Inception Date
Mar 13, 2007
Inception DateMar 13, 2007

What's in this fund

Sectors

As of January 21, 2026
Securitized Bonds95.74%
Cash and Equivalents4.26%

Top 10 Holdings (10.01% of total assets)

As of January 21, 2026
NameSymbol% Assets
BlackRock Cash Funds Instl SL Agency4.39%
Federal Home Loan Mortgage Corp. 2%1.06%
Government National Mortgage Association 5.5%0.99%
Government National Mortgage Association 2%0.56%
Government National Mortgage Association 2%0.54%
Federal Home Loan Mortgage Corp. 2%0.53%
Federal Home Loan Mortgage Corp. 2%0.51%
Government National Mortgage Association 5%0.50%
Government National Mortgage Association 2.5%0.47%
Government National Mortgage Association 6%0.46%

MBB Key Statistics

AUM
39.35B
AUM39.35B
Price-Earnings ratio
Price-Earnings ratio
30-Day yield
4.11
30-Day yield4.11
Average volume
4.47M
Average volume4.47M
High today
$95.57
High today$95.57
Low today
$95.38
Low today$95.38
Open price
$95.46
Open price$95.46
Volume
2.24M
Volume2.24M
52 Week high
$96.25
52 Week high$96.25
52 Week low
$90.84
52 Week low$90.84
Expense ratio
0.04
Expense ratio0.04

Stock Snapshot

As of today, iShares MBS ETF(MBB) shares are valued at $95.55. The company's market cap stands at 39.37B, with a dividend yield of 2.6%.

On 2026-01-24, iShares MBS ETF(MBB) stock moved within a range of $95.38 to $95.57. With shares now at $95.55, the stock is trading +0.2% above its intraday low and -0.0% below the session's peak.

Trading volume for iShares MBS ETF(MBB) stock has reached 2.24M, versus its average volume of 4.47M.

Over the past 52 weeks, iShares MBS ETF(MBB) stock has traded between a high of $96.25 and a low of $90.84.

Over the past 52 weeks, iShares MBS ETF(MBB) stock has traded between a high of $96.25 and a low of $90.84.

Average Annual Return

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All investments involve risks, including the loss of principal. Performance data represents past performance and is no guarantee of future results. Investment returns and principal value will fluctuate and are subject to market volatility. An investment, when redeemed, may be worth more or less than the original cost. Current performance may be lower or higher than the performance data quoted. Options are risky and aren’t suitable for all investors. To learn more about risks, read the Options Disclosure Document.