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
11,374
Number of holdings11,374
Inception Date
Mar 13, 2007
Inception DateMar 13, 2007

What's in this fund

Sectors

As of October 30, 2025
Securitized Bonds95.17%
Cash and Equivalents4.83%

Top 10 Holdings (10.66% of total assets)

As of October 30, 2025
NameSymbol% Assets
BlackRock Cash Funds Instl SL Agency5.01%
Federal Home Loan Mortgage Corp. 2%1.00%
Government National Mortgage Association 6%0.91%
Government National Mortgage Association 5.5%0.79%
Government National Mortgage Association 2%0.53%
Government National Mortgage Association 2%0.53%
Federal National Mortgage Association 2%0.51%
Federal Home Loan Mortgage Corp. 2%0.49%
Government National Mortgage Association 2.5%0.45%
Federal National Mortgage Association 2%0.44%

MBB Key Statistics

AUM
41.48B
AUM41.48B
Price-Earnings ratio
Price-Earnings ratio
30-Day yield
4.17
30-Day yield4.17
Average volume
3.40M
Average volume3.40M
High today
$95.44
High today$95.44
Low today
$95.16
Low today$95.16
Open price
$95.19
Open price$95.19
Volume
3.22M
Volume3.22M
52 Week high
$96.25
52 Week high$96.25
52 Week low
$90.28
52 Week low$90.28
Expense ratio
0.04
Expense ratio0.04

Stock Snapshot

With a market cap of 41.47B, iShares MBS ETF(MBB) trades at $95.44. currently yields dividends of 2.6%.

On 2025-11-09, iShares MBS ETF(MBB) stock moved within a range of $95.16 to $95.44. With shares now at $95.44, the stock is trading +0.3% above its intraday low and 0.0% below the session's peak.

Trading activity shows a volume of 3.22M, compared to an average daily volume of 3.4M.

Over the past 52 weeks, iShares MBS ETF(MBB) stock has traded between a high of $96.25 and a low of $90.28.

Over the past 52 weeks, iShares MBS ETF(MBB) stock has traded between a high of $96.25 and a low of $90.28.

MBB News

Nasdaq 4d
MBB: ETF Outflow Alert

Looking today at week-over-week shares outstanding changes among the universe of ETFs covered at ETF Channel , one standout is the iShares MBS ETF (Symbol: MBB)...

MBB: ETF Outflow Alert

Average Annual Return

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.