Fund Evaluator:
iShares MBS ETF (MBB)
Follow This Fund
Fixed Income
Global Asset Class
Taxable Bond
Fund Group
Government Mortgage-Backed Bond
Category
$108.290
NAV (as of Oct 07)
$0.00
Minimum Initial
0.04% A
Expense Ratio
$38,928 Mil
Assets
Open
Status
na
12b-1 Fee
4.34%
TTM Yield
0.00%
Max Load
153%
Portfolio Turnover
Best Performing in Government Mortgage-Backed Bond Over the Last Year
| 4.4% | Fidelity Mortgage Securities (FMSFX) |
| 4.4% | Fidelity Advisor Mortgage Securities Z (FIKUX) |
| 4.3% | Fidelity GNMA (FGMNX) |
| 4.3% | Vanguard Mortgage-Backed Secs Idx Adm (VMBSX) |
| 4.2% | Vanguard GNMA Adm (VFIJX) |
Data as of 7/31/2026
-1.4% B
1-Mo Return
-0.9% C
3-Mo Return
-0.4% F
YTD Return
4.1% C
1-Yr Return
4.1% D
3-Yr Return
0.0% D
5-Yr Return
1.05 D
Category Risk Index
0.53
Total Risk Index
Fund Details
Fund Family
iShares
Inception Date
3/13/2007
Share Class Type
Equity Investment Style
na
Bond Investment Style
na
Socially Responsible Fund
No
Index Fund
Yes
Benchmark Index
Bloomberg US Universal TR USD: 100%
Additional Fund Details
iShares MBS ETF Overview
MBB Trailing NAV Total Returns Data as of 7/31/26
| Last Month |
Last Quarter |
Ann'l. 1Yr |
Ann'l. 3Yr |
Ann'l. 5Yr |
Ann'l. 10Yr |
|
| MBB Return (NAV) | -1.4% | -0.9% | 4.1% | 4.1% | 0.0% | 1.1% |
| MBB Grade | B | C | C | D | D | C |
| +/- Category | -0.2% | -0.1% | 0.7% | 0.3% | -0.0% | 0.2% |
| Government Mortgage-Backed Bond Avg | -1.2% | -0.9% | 3.4% | 3.8% | 0.1% | 1.0% |
| MBB Tax Cost Ratio | na | na | 1.7% | 1.6% | 1.3% | 1.1% |
MBB Annual NAV Total ReturnsData as of 7/31/26
| 2026 | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | 2016 | |
| MBB Return (NAV) | -0.4% | 8.4% | 1.3% | 5.0% | -11.9% | -1.3% | 4.0% | 6.3% | 0.8% | 2.4% | 1.3% |
| MBB Grade | F | C | D | D | D | C | D | C | C | B | F |
| +/- Category | 0.0% | 0.8% | 0.1% | 0.5% | -1.4% | 0.1% | -0.3% | 1.1% | 0.4% | 1.1% | -0.1% |
| Government Mortgage-Backed Bond Avg | -0.4% | 7.6% | 1.2% | 4.4% | -10.5% | -1.4% | 4.4% | 5.2% | 0.5% | 1.3% | 1.3% |
| Risk Measures | |
| Standard Deviation: | 6.4% |
| Total Risk Index: | 0.53 - Low |
| Category Risk Index: | 1.05 - High |
| Category Risk Grade: | F (89% Rank) |
| Beta: | 1.14 |
| R-Squared: | 99% |
| Leveraged Fund: | No |
| Inverse Fund: | No |
| Portfolio Characteristics | |
| Equity Investment Style: | na |
| Bond Investment Style: | na |
| Yield: | 4.3% |
| Dividend Distribution: | Monthly |
| Cap Gains Distribution: | Annually |
| Total Assets: | $38928 Mil |
| Fund Total Assets: | $38,929 Mil |
| Share Class Type: | |
| Portfolio Turnover: | 153% |
Management Team
| Number of Managers: 3 | |||
| Longest Tenure: 15.1 years | |||
| Average Tenure: 5.7 years | |||
| Managers (Year): Mauro James (2011), Graves Jonathan (2025), Tom Marcus (2025) | |||
Portfolio Composition (as of 7/31/26)
| # of Holdings: | 11184 |
| % in Top 10 Holdings: | 14.7% |
| Fund is Non-Diversified: | No |
| % in Foreign Issues: | 0.0% |
Portfolio Allocation |
|
| Domestic Stock: | 0.0% |
| Foreign Stock: | 0.0% |
| Preferred Stock: | 0.0% |
| Domestic Bond: | 99.5% |
| Foreign Bond: | 0.0% |
| Convertible Bond: | 0.0% |
| Other: | 0.0% |
| Cash: | 0.5% |
Purchase Information
| Fund Family: | iShares |
| Phone Number: | 800-474-2737 |
| Website: | au.ishares.com |
| Status: | Open |
| Inception Date: | March 13, 2007 |
| Min. Initial Purchase: | $ 0 |
| Min. Initial IRA Purchase: | $ 0 |
| True No-Load: | Yes |
| Front Load Maximum: | 0.00% |
| Deferred Charge Maximum: | 0.00% |
| Redemption Charge Maximum: | 0.00% |
| 12b-1 Fee: | na |
Expenses and Fees | |
| Expense Ratio (%): | 0.04% ( Rating : Low ) |
| Category Average Expense Ratio (%): | 0.89% |
| Share Class: | iShares MBS ETF |
| Min. Subsequent Purchase: | $ 0 |
| Min. Subsequent IRA Purchase: | $ 0 |
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