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 (10.66% of total assets)

As of October 1, 2026

NameSymbol% Assets

BlackRock Cash Funds Instl SL Agency—5.09%

Federal Home Loan Mortgage Corp. 2%—1.04%

Government National Mortgage Association 6%—0.68%

Federal National Mortgage Association 5.5%—0.59%

Government National Mortgage Association 5%—0.59%

Government National Mortgage Association 5.5%—0.57%

Government National Mortgage Association 2%—0.54%

Government National Mortgage Association 2%—0.53%

Federal National Mortgage Association 2%—0.52%

Government National Mortgage Association 2.5%—0.51%

MBB Key Statistics

AUM

35.44B

AUM35.44B

Price-Earnings ratio

—

Price-Earnings ratio—

30-Day yield

4.48

30-Day yield4.48

Average volume

12.99M

Average volume12.99M

High today

$89.87

High today$89.87

Low today

$89.17

Low today$89.17

Open price

$89.77

Open price$89.77

Volume

4.65M

Volume4.65M

52 Week high

$96.97

52 Week high$96.97

52 Week low

$88.92

52 Week low$88.92

Expense ratio

0.04

Expense ratio0.04

View Prospectus and Reports

Stock Snapshot

With a market cap of 35.39B, iShares MBS ETF(MBB) trades at $89.21. currently yields dividends of 2.62%.

During the trading session on 2026-10-03, iShares MBS ETF(MBB) shares reached a daily high of $89.87 and a low of $89.17. At a current price of $89.21, the stock is +0.1% higher than the low and still -0.7% under the high.

Trading activity shows a volume of 4.65M, compared to an average daily volume of 12.99M.

The stock's 52-week range extends from a low of $88.92 to a high of $96.97.

MBB News

Benzinga 16h

Record $2.7B BlackRock Mortgage Bond ETF Outflow Tops Global Financial Crisis, COVID-19: What’s Driving the Exodus?

The sell-off in mortgage-backed securities ETFs was even more extreme than September’s headline $2.4 billion sector outflow suggested. BlackRock’s iShares MBS E...

Average Annual Return

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