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

What's in this fund

Sectors

As of November 26, 2025

Securitized Bonds95.87%

Cash and Equivalents4.13%

Top 10 Holdings (9.79% of total assets)

As of November 26, 2025

NameSymbol% Assets

BlackRock Cash Funds Instl SL Agency—4.24%

Federal Home Loan Mortgage Corp. 2%—1.06%

Government National Mortgage Association 5.5%—0.78%

Government National Mortgage Association 6%—0.60%

Government National Mortgage Association 2%—0.56%

Federal Home Loan Mortgage Corp. 2%—0.54%

Federal Home Loan Mortgage Corp. 2%—0.52%

Government National Mortgage Association 2.5%—0.47%

Federal Home Loan Mortgage Corp. 2%—0.46%

MBB Key Statistics

AUM

39.41B

AUM39.41B

Price-Earnings ratio

—

Price-Earnings ratio—

30-Day yield

4.13

30-Day yield4.13

Average volume

3.05M

Average volume3.05M

High today

$95.93

High today$95.93

Low today

$95.65

Low today$95.65

Open price

$95.82

Open price$95.82

Volume

1.36M

Volume1.36M

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

View Prospectus and Reports

Stock Snapshot

With a market cap of 39.4B, iShares MBS ETF(MBB) trades at $95.76. currently yields dividends of 2.6%.

On 2025-11-30, iShares MBS ETF(MBB) stock moved within a range of $95.65 to $95.93. With shares now at $95.76, the stock is trading +0.1% above its intraday low and -0.2% below the session's peak.

Trading activity shows a volume of 1.36M, compared to an average daily volume of 3.05M.

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