MBB

iShares MBS ETF

Core exposure to investment-grade US agency mortgage-backed securities guaranteed by Ginnie Mae, Fannie Mae and Freddie Mac (~11,200 holdings). One of the cheapest bond ETFs anywhere at 0.04% with ~$39B AUM; monthly distributions and a track record through the 2008 mortgage crisis.

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Fixed IncomeTER 0.04%Dist.

TER

0.04%

AUM

$39.1B

Holdings

~11,200

Data Range

— → —

Key Facts

ISIN

US4642885887

Issuer

BlackRock

Benchmark

Bloomberg U.S. MBS Index

Total Expense Ratio (TER)

0.04%

Assets Under Management

$39.1B approx.

Inception Date

2007-03-13

Domicile

United States

Legal Structure

Open-End Fund

Dividend Policy

Distributing (pays dividends)

Replication Method

Physical (Optimized Sampling)

UCITS Status

✗ Not UCITS

Fund Currency

USD

Primary Exchange

NASDAQ

Number of Holdings

~11,200

Backtest this ETF Official Fund Page

Who Is This ETF For?

✓Portfolio stabilizer and income generator. Reduces overall portfolio volatility when paired with equities.

Key Risks to Consider

• Interest rate risk: bond prices fall when rates rise.

• Non-UCITS: may have unfavorable tax treatment for non-US investors (US estate tax, withholding tax).

Similar ETFs

BND0.03% TER

Vanguard Total Bond Market ETF

Total US Bond Market · Vanguard

AGG0.03% TER

iShares Core US Aggregate Bond ETF

Total US Bond Market · BlackRock

TIP0.19% TER

iShares TIPS Bond ETF

Inflation-Protected Bonds · BlackRock

SHV0.15% TER

iShares Short Treasury Bond ETF

Ultra Short-Term Treasury · BlackRock

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Data & Methodology

Metadata sourced from official issuer documentation. Price data from Yahoo Finance (monthly adjusted close, includes reinvested dividends and splits). AUM figures are approximate and updated quarterly.

Data source: iShares (metadata); research profile — price series pendingLast verified: 2026-08-28

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💬 Frequently Asked Questions

MBB has a total expense ratio (TER) of 0.04%, which means you pay $4 per year for every $10,000 invested.

Yes, MBB is a distributing ETF that pays dividends to shareholders. The frequency depends on the fund's schedule.

MBB is a US-domiciled ETF (not UCITS). Non-US investors should consider the US estate tax implications (40% on US assets above $60,000) and the 30% dividend withholding tax (reduced by treaty in some countries).

MBB uses optimized sampling, holding a representative subset of the Bloomberg U.S. MBS Index index to minimize costs while closely tracking performance.