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 MBS TR USD

Index-TrackedBBgBarc US MBS TR USD

What's in this fund

Sectors

As of May 23, 2025

Securitized Bonds96.42%

Cash and Equivalents3.58%

Top 10 Holdings (8.59% of total assets)

As of May 23, 2025

NameSymbol% Assets

BlackRock Cash Funds Instl SL Agency—3.66%

Federal Home Loan Mortgage Corp. 2%—0.80%

Government National Mortgage Association 2%—0.59%

Government National Mortgage Association 2%—0.58%

Federal National Mortgage Association 2%—0.55%

Federal Home Loan Mortgage Corp. 2%—0.53%

Government National Mortgage Association 2.5%—0.50%

Federal National Mortgage Association 2%—0.46%

Fnma Pass-Thru I 2%—0.47%

Government National Mortgage Association 5%—0.45%

MBB Key Statistics

AUM

37.89B

AUM37.89B

Price-Earnings ratio

—

Price-Earnings ratio—

30-Day yield

4.21

30-Day yield4.21

Average volume

2.91M

Average volume2.91M

High today

$92.24

High today$92.24

Low today

$91.31

Low today$91.31

Open price

$92.02

Open price$92.02

Volume

2.29M

Volume2.29M

52 Week high

$96.76

52 Week high$96.76

52 Week low

$90.03

52 Week low$90.03

Expense ratio

0.05

Expense ratio0.05

View Prospectus and Reports