BlackRockGovernment Mortgage-Backed BondMBBA · Cboe BZX

iShares Mortgage-Backed Securities Active ETF (MBBA)

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Price: $48.26; —30 Oct 2026
Assets: $699.6M; Total net assets
Expense ratio: 0.25%; Category 0.82%
Yield: 4.45%; Trailing distributions

1Y return: —; Category 0.6%
3Y CAGR: —; Category 6.1%
5Y CAGR: —; Category 0.3%

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iShares Mortgage-Backed Securities Active ETF

Calendar-year returns

Fund only: no comparison series covers this fund's history.

Risk statistics

Five years of daily closes. Risk-free rate 4% a year.

Standard deviation: —
Maximum drawdown: —
Sharpe ratio: —
Sortino ratio: —
Beta: —
Alpha: —
R²: —
Information ratio: —
Upside capture: —
Downside capture: —
Tracking error: —

Trailing returns compared with benchmark
Period	1M	3M	6M	YTD	1Y	3YCAGR	5YCAGR	10YCAGR	LaunchCAGR
ETF	+3.0%	-0.3%	-1.1%	—	—	—	—	—	-0.6%
Government Mortgage-Backed Bond average	2.8%	-0.1%	-1.0%	-0.2%	0.6%	6.1%	0.3%	1.2%	2.0%
Difference	+0.2%	-0.2%	-0.1%	—	—	—	—	—	-2.6%

Holdings

The 1 largest positions make up 53.5% of the fund.

Top holdings

Largest holdings by weight
Ticker	Holding	Weight
XTSLA	BlackRock Cash Funds Treasury SL Agency	53.48%

Credit quality

Share of the bonds by rating.

AAA3.2%
AA96.8%

Asset mix

Bonds132.7%

ETF details

Issuer: BlackRock
Category: Fixed Income · Government Mortgage-Backed Bond
Ticker: MBBA
Exchange: Cboe BZX
Inception: 18 May 1998 (28.5 years)
Structure: Exchange Traded Fund
Expense ratio: 0.25% (category 0.82%)
Holdings turnover: 1,287% (category 321%)
Distribution yield: 4.45%
Beta, 3 years: 1.11
Total net assets: $699.6M
Average duration: 4.19 years
Average maturity: 8.82 years

Prices and returns as of 30 Oct 2026; total return with distributions reinvested, before brokerage and taxes. Not investment advice.

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