MBBAiShares Mortgage-Backed Securities Active ETF
Seeks to maximize total return, consistent with income generation and prudent investment management.
By BlackRock · Launched 1998
Annual Cost
0.25%
#1,139 of 5,861 · low cost
Fund Size
$154M
#2,587 of 5,861 · mid-size
Return (1Y)Goal
N/A
Track Record
28 years
#45 of 5,861 · established
Performance
Total-return NAV · USDGrowth of $10,000
$9,970-0.3%
Total-return NAV, USD. Net of fund fees, before tax.
What's inside
How Beacon categorizes this fundAsset class
Fixed incomeRegion
North americaStrategy
Active selection
Index tracked
Bloomberg US MBS Index
What it actually holds
By weightConcentration
Top 10 holdings = 102.9% of fundconcentrated
Federal National Mortgage Association or Federal Home Loan Mortgage Corp.
19.4%
Federal National Mortgage Association or Federal Home Loan Mortgage Corp.
14.1%
Federal National Mortgage Association or Federal Home Loan Mortgage Corp.
14.0%
Federal National Mortgage Association
13.8%
Federal National Mortgage Association or Federal Home Loan Mortgage Corp.
12.3%
Federal National Mortgage Association or Federal Home Loan Mortgage Corp.
10.2%
Federal National Mortgage Association or Federal Home Loan Mortgage Corp.
5.8%
Government National Mortgage Association
5.0%
Federal National Mortgage Association or Federal Home Loan Mortgage Corp.
4.6%
Federal National Mortgage Association
3.6%
Asset allocation
Bonds
135.9%
Other
4.0%
Risk profile
Last 12 months · Sharpe & Sortino need 3+ yearsVolatility (1Y)
N/A
Max drawdown
-2.8%Mild
Worst peak-to-trough loss
Sharpe (3Y)
Unavailable
Needs 3+ years of history
Sortino (3Y)
Not yet
Needs 3+ years of history
Bond profile
Duration
4.2 years
Avg maturity
9.1 years
Credit ratings
AAA
7.2%
AA
92.8%
Listing
- Exchange
- Cboe BZX
Full fund details
- Objective
- Seeks to maximize total return, consistent with income generation and prudent investment management.
- Strategy
- Invests at least 80% of net assets in mortgage-backed securities and derivatives providing exposure to such securities. Aims to maintain an average portfolio duration within ±1 year of the Bloomberg U.S. MBS Index.
- Inception date
- May 18, 1998
- Fund family
- BlackRock
Similar funds
Same asset class, closest by strategy & exposureWhat's next?
You've looked at MBBA. Save it to your watchlist to weigh it against other funds, then turn your shortlist into a portfolio.
Data updated on 2026-08-04