BlackRockGovernment Mortgage-Backed BondMBBA · Cboe BZX

iShares Mortgage-Backed Securities Active ETF (MBBA)

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Price: $48.02; —11 Sept 2026
Assets: $157.2M; Total net assets
Expense ratio: 0.25%; Category 0.82%
Yield: 4.25%; Trailing distributions

1Y return: —; Category 0.5%
3Y CAGR: —; Category 4.4%
5Y CAGR: —; Category 0.1%

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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	-1.5%	-2.1%	-1.2%	—	—	—	—	—	-1.2%
Government Mortgage-Backed Bond average	-1.4%	-1.8%	-1.3%	-0.8%	0.5%	4.4%	0.1%	1.1%	2.1%
Difference	-0.2%	-0.3%	+0.1%	—	—	—	—	—	-3.3%

Holdings

The 1 largest positions make up 4.3% of the fund.

Top holdings

Largest holdings by weight
Ticker	Holding	Weight
TSTXX	BlackRock Liquidity T-Fund Instl	4.35%

Credit quality

Share of the bonds by rating.

AAA6.4%
AA93.6%

Asset mix

Bonds96.2%
Other5.9%

ETF details

Issuer: BlackRock
Category: Fixed Income · Government Mortgage-Backed Bond
Ticker: MBBA
Exchange: Cboe BZX
Inception: 18 May 1998 (28.3 years)
Structure: Exchange Traded Fund
Expense ratio: 0.25% (category 0.82%)
Holdings turnover: 1,287% (category 321%)
Distribution yield: 4.25%
Beta, 3 years: 1.10
Total net assets: $157.2M
Average duration: 4.21 years
Average maturity: 9.12 years

Prices and returns as of 11 Sept 2026; total return with distributions reinvested, before brokerage and taxes. Not investment advice.

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