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 July 9, 2025

Securitized Bonds95.81%

Cash and Equivalents4.19%

Top 10 Holdings (9.25% of total assets)

As of July 9, 2025

NameSymbol% Assets

BlackRock Cash Funds Instl SL Agency—4.32%

Federal Home Loan Mortgage Corp. 2%—0.86%

Government National Mortgage Association 2%—0.57%

Government National Mortgage Association 2%—0.56%

Federal National Mortgage Association 2%—0.54%

Federal Home Loan Mortgage Corp. 2%—0.51%

Federal National Mortgage Association 5.5%—0.50%

Government National Mortgage Association 2.5%—0.48%

Federal National Mortgage Association 2%—0.46%

Federal National Mortgage Association 2%—0.45%

MBB Key Statistics

AUM

38.91B

AUM38.91B

Price-Earnings ratio

—

Price-Earnings ratio—

30-Day yield

4.22

30-Day yield4.22

Average volume

2.72M

Average volume2.72M

High today

$93.00

High today$93.00

Low today

$92.81

Low today$92.81

Open price

$92.93

Open price$92.93

Volume

2.04M

Volume2.04M

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