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
11,103
Number of holdings11,103
Inception Date
Mar 13, 2007
Inception DateMar 13, 2007

What's in this fund

Sectors

As of May 15, 2026
Securitized Bonds94.59%
Cash and Equivalents5.41%

Top 10 Holdings (12.16% of total assets)

As of May 15, 2026
NameSymbol% Assets
BlackRock Cash Funds Instl SL Agency5.63%
Federal Home Loan Mortgage Corp. 2%1.06%
Government National Mortgage Association 5.5%0.99%
Federal National Mortgage Association 5.5%0.85%
Federal National Mortgage Association 5%0.78%
Government National Mortgage Association 5%0.68%
Government National Mortgage Association 5%0.56%
Government National Mortgage Association 2%0.55%
Government National Mortgage Association 2%0.54%
Federal National Mortgage Association 2%0.52%

MBB Key Statistics

AUM
37.64B
AUM37.64B
Price-Earnings ratio
Price-Earnings ratio
30-Day yield
4.20
30-Day yield4.20
Average volume
2.39M
Average volume2.39M
High today
$93.86
High today$93.86
Low today
$93.29
Low today$93.29
Open price
$93.41
Open price$93.41
Volume
1.33M
Volume1.33M
52 Week high
$96.97
52 Week high$96.97
52 Week low
$91.19
52 Week low$91.19
Expense ratio
0.04
Expense ratio0.04

Stock Snapshot

iShares MBS ETF(MBB) stock is priced at $93.86, giving the company a market capitalization of 37.94B. pays a dividend yield of 2.6%.

On 2026-05-21, iShares MBS ETF(MBB) stock traded between a low of $93.29 and a high of $93.86. Shares are currently priced at $93.86, which is +0.6% above the low and -0.0% below the high.

The iShares MBS ETF(MBB)'s current trading volume is 1.33M, compared to an average daily volume of 2.39M.

In the last year, iShares MBS ETF(MBB) shares hit a 52-week high of $96.97 and a 52-week low of $91.19.

In the last year, iShares MBS ETF(MBB) shares hit a 52-week high of $96.97 and a 52-week low of $91.19.

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.