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
11,160
Number of holdings11,160
Inception Date
Mar 13, 2007
Inception DateMar 13, 2007

What's in this fund

Sectors

As of February 25, 2026
Securitized Bonds94.34%
Cash and Equivalents5.66%

Top 10 Holdings (11.79% of total assets)

As of February 25, 2026
NameSymbol% Assets
BlackRock Cash Funds Instl SL Agency5.92%
Federal Home Loan Mortgage Corp. 2%1.07%
Government National Mortgage Association 5.5%1.05%
Federal National Mortgage Association 5%0.57%
Government National Mortgage Association 2%0.56%
Government National Mortgage Association 2%0.54%
Federal Home Loan Mortgage Corp. 2%0.54%
Government National Mortgage Association 5%0.53%
Federal Home Loan Mortgage Corp. 2%0.51%
Federal National Mortgage Association 5.5%0.50%

MBB Key Statistics

AUM
39.75B
AUM39.75B
Price-Earnings ratio
Price-Earnings ratio
30-Day yield
4.03
30-Day yield4.03
Average volume
2.14M
Average volume2.14M
High today
$96.97
High today$96.97
Low today
$96.83
Low today$96.83
Open price
$96.92
Open price$96.92
Volume
1.87M
Volume1.87M
52 Week high
$96.97
52 Week high$96.97
52 Week low
$90.84
52 Week low$90.84
Expense ratio
0.04
Expense ratio0.04

Stock Snapshot

The current iShares MBS ETF(MBB) stock price is $96.90, with a market capitalization of 39.8B. It offers a dividend yield of 2.6%.

As of 2026-02-28, iShares MBS ETF(MBB) stock has fluctuated between $96.83 and $96.97. The current price stands at $96.90, placing the stock +0.1% above today's low and -0.1% off the high.

iShares MBS ETF(MBB) shares are trading with a volume of 1.87M, against a daily average of 2.14M.

In the last year, iShares MBS ETF(MBB) shares hit a 52-week high of $96.97 and a 52-week low of $90.84.

In the last year, iShares MBS ETF(MBB) shares hit a 52-week high of $96.97 and a 52-week 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.