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iShares MBS ETF

Ticker: MBB ISIN: US4642885887
Add to portfolio Portfolio analysis in 2min
ETF Low-cost
Morningstar
★★★
TER
0.04%
Fund size
$38.35B
Holdings
1
Top 10
6.5%
Issuer
iShares
Yield to maturity
4.85%
Duration
5.5y
Avg. maturity
6.7y
$93.31 0.20%
Price as of 2026-08-24 · NASDAQ

Performance by timeframe

Rolling returns
1 Month +0.30%
6 Months -1.28%
1 Year +3.74%
5 Years +0.28% p.a.+1.39%
10 Years +1.21% p.a.+12.80%
Since inception +2.64% p.a.+65.96%
Calendar year returns
YTD +0.45%
2025 +8.39%
2024 +1.32%
2023 +5.01%
2022 -11.74%
2021 -1.43%

Key stats

AUM
38.35B
Expense ratio
0.04%
Holdings
1
1Y return
3.74%
Volatility (1Y)
4.41%
52-week range
87.40 - 95.96
Section 1

Fund overview

Fund profile data from fundamentals.

The fund will invest at least 80% of its assets in the component securities of the underlying index and TBAs that have economic characteristics that are substantially identical to the economic characteristics of the component securities of the index, and the fund will invest at least 90% of its assets in fixed income securities of the types included in the underlying index that BFA believes will help the fund track the index.

Category Government Mortgage-Backed Bond
Issuer iShares
Domicile USA
Section 2

Exposure breakdown

Exposure breakdown shows how the fund is allocated across assets, sectors, regions, and size buckets.

Asset allocation

Bond
98.49%
Cash
1.51%

Fixed income

Price
92.11%
EffectiveMaturity
6.74%
EffectiveDuration
5.46%
ModifiedDuration
5.21%
YieldToMaturity
4.85%
Coupon
3.66%
Section 3

Top holdings

Top holdings show which underlying securities drive the fund most.

BlackRock Cash Funds Instl SL Agency
6.49%
Section 4

Performance & risk

Historical return and risk indicators over fixed windows.

Returns

YTD return 1.08%
1M return 0.30%
6M return -1.28%
1Y return 3.74%
3Y return 4.28%
5Y return 1.39%
10Y return 1.37%

Risk

Volatility (1Y) 4.41%
Volatility (3Y) 6.41%
Sharpe ratio (3Y) -0.10
Beta 1.13
52-week range 87.40 - 95.96
Section 5

Portfolio characteristics

Fund concentration and composition metrics from source fields.

Overview

Holdings count 1
Top 10 weight 6.49%
Expense ratio 0.04%
Fund size 38.35B
Turnover 2.49%

Details

Instrument metadata and source update timestamps.

Symbol MBB
Name iShares MBS ETF
Asset type ETF
Exchange NASDAQ
Currency USD
ISIN US4642885887
Country USA
Code + exchange MBB.NASDAQ
Last price date 2026-05-08
Fundamentals updated 2026-05-11

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