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

Top 10 Holdings (10.27% of total assets)

As of September 9, 2025

NameSymbol% Assets

BlackRock Cash Funds Instl SL Agency—4.73%

Federal Home Loan Mortgage Corp. 2%—1.00%

Government National Mortgage Association 6%—0.95%

Government National Mortgage Association 5.5%—0.61%

Government National Mortgage Association 2%—0.54%

Government National Mortgage Association 2%—0.53%

Federal National Mortgage Association 2%—0.52%

Federal Home Loan Mortgage Corp. 2%—0.49%

Government National Mortgage Association 2.5%—0.46%

Federal National Mortgage Association 2%—0.44%

MBB Key Statistics

AUM

41.43B

AUM41.43B

Price-Earnings ratio

—

Price-Earnings ratio—

30-Day yield

4.21

30-Day yield4.21

Average volume

2.57M

Average volume2.57M

High today

$95.79

High today$95.79

Low today

$95.53

Low today$95.53

Open price

$95.60

Open price$95.60

Volume

2.39M

Volume2.39M

52 Week high

$96.76

52 Week high$96.76

52 Week low

$90.28

52 Week low$90.28

Expense ratio

0.04

Expense ratio0.04

View Prospectus and Reports