iShares MBS ETF

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Robinhood gives you the tools you need to put your money in motion. You can buy or sell MBB and other ETFs, options, and stocks.

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 June 17, 2025

Securitized Bonds96.43%

Cash and Equivalents3.57%

Top 10 Holdings (8.58% of total assets)

As of June 17, 2025

NameSymbol% Assets

BlackRock Cash Funds Instl SL Agency—3.65%

Federal Home Loan Mortgage Corp. 2%—0.86%

Government National Mortgage Association 2%—0.58%

Government National Mortgage Association 2%—0.57%

Federal National Mortgage Association 2%—0.54%

Federal Home Loan Mortgage Corp. 2%—0.52%

Government National Mortgage Association 2.5%—0.49%

Federal National Mortgage Association 2%—0.46%

Government National Mortgage Association 5%—0.45%

MBB Key Statistics

AUM

38.73B

AUM38.73B

Price-Earnings ratio

—

Price-Earnings ratio—

30-Day yield

4.22

30-Day yield4.22

Average volume

2.69M

Average volume2.69M

High today

$92.99

High today$92.99

Low today

$92.45

Low today$92.45

Open price

$92.90

Open price$92.90

Volume

3.12M

Volume3.12M

52 Week high

$96.76

52 Week high$96.76

52 Week low

$90.28

52 Week low$90.28

Expense ratio

0.05

Expense ratio0.05

View Prospectus and Reports