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 April 22, 2025

Securitized Bonds97.07%

Cash and Equivalents2.93%

Top 10 Holdings (8.06% of total assets)

As of April 22, 2025

NameSymbol% Assets

BlackRock Cash Funds Instl SL Agency—2.98%

Federal Home Loan Mortgage Corp. 2%—0.86%

Government National Mortgage Association 2%—0.63%

Government National Mortgage Association 2%—0.61%

Federal Home Loan Mortgage Corp. 2%—0.56%

Government National Mortgage Association 2.5%—0.54%

Federal National Mortgage Association 2%—0.49%

Fnma Pass-Thru I 2%—0.50%

Government National Mortgage Association 5%—0.45%

Government National Mortgage Association 6.5%—0.44%

MBB Key Statistics

AUM

36.30B

AUM36.30B

Price-Earnings ratio

—

Price-Earnings ratio—

30-Day yield

4.16

30-Day yield4.16

Average volume

3.06M

Average volume3.06M

High today

$93.30

High today$93.30

Low today

$93.05

Low today$93.05

Open price

$93.19

Open price$93.19

Volume

487.62K

Volume487.62K

52 Week high

$96.76

52 Week high$96.76

52 Week low

$89.16

52 Week low$89.16

Expense ratio

0.05

Expense ratio0.05

View Prospectus and Reports