Expense Ratio
The annual fee the ETF charges, deducted daily from NAV. A 0.05% ratio costs you $5/year per $10,000 invested, over 30 years that's the difference between a great fund and a mediocre one.
Learn more →iShares MBS ETF
MBBBlackRock (iShares)Fixed Income
AI Agents
NAV
$95.33
Net Assets
-
Expense Ratio
0.04%
YTD
+1.11%
1Y
+5.72%
3Y CAGR
+4.13%
5Y CAGR
+0.40%
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.
Price History1,255 daily observations
Price History▲ 1.68% over 1Y
Returns PerformanceTrailing total returns
| YTD | 1Y | 3Y CAGR | 5Y CAGR |
|---|---|---|---|
| +1.11% | +5.72% | +4.13% | +0.40% |
Expense Ratio
Net (after waivers)0.04%
Gross (before waivers)0.04%
Net expense ratio reflects fee waivers and reimbursements actually paid by investors. Gross is the full management cost.
Sector Allocation1 sector
Fixed Income / Cash95.17%
Top 10 Holdings ConcentrationWhat share of the fund the largest 10 positions occupy
Top 10 Weight
11.3%
Total Holdings
70
Verdict
broadly diversified
Top Holdings70 positions
💡Reading the Holdings Table
The Weight column shows how much of the ETF's assets sit in each constituent. The Allocation bar scales each weight to the largest position so you can see relative concentration at a glance, and the Cumul. column tracks the running total, a fast read on how top-heavy this ETF is. The top 10 holdings account for 11.3% of assets. Click any constituent name to open its US stock detail page.
📖 Learn: Diversification & Asset Allocation →| # | Holding | Sector | Allocation | Weight | Cumul. |
|---|---|---|---|---|---|
| 1 | BLACKROCK CASH CL INST SL AGENCYBLACKROCK CASH CL INST SL AGENCY | Fixed Income / Cash | 6.46% | 6.5% | |
| 2 | FHLMC 30YR UMBS SUPERFHLMC 30YR UMBS SUPER | Fixed Income / Cash | 1.07% | 7.5% | |
| 3 | UMBS 30YR TBA(REG A)UMBS 30YR TBA(REG A) | Fixed Income / Cash | 0.83% | 8.4% | |
| 4 | GNMA2 30YR TBA(REG C)GNMA2 30YR TBA(REG C) | Fixed Income / Cash | 0.77% | 9.1% | |
| 5 | GNMA2 30YRGNMA2 30YR | Fixed Income / Cash | 0.57% | 9.7% | |
| 6 | FNMA 30YR UMBSFNMA 30YR UMBS | Fixed Income / Cash | 0.53% | 10.2% | |
| 7 | FNMA 30YR UMBS SUPERFNMA 30YR UMBS SUPER | Fixed Income / Cash | 0.45% | 10.7% | |
| 8 | UMBS 15YR TBA(REG B)UMBS 15YR TBA(REG B) | Fixed Income / Cash | 0.26% | 10.9% | |
| 9 | FHLMC 30YR UMBSFHLMC 30YR UMBS | Fixed Income / Cash | 0.22% | 11.2% | |
| 10 | FNMA 30YR UMBS MEGA REMIC SUPERFNMA 30YR UMBS MEGA REMIC SUPER | Fixed Income / Cash | 0.17% | 11.3% | |
| 11 | GNMA II 30YRGNMA II 30YR | Fixed Income / Cash | 0.16% | 11.5% | |
| 12 | FNMA 15YR UMBSFNMA 15YR UMBS | Fixed Income / Cash | 0.16% | 11.6% | |
| 13 | FHLMC 15YR UMBS SUPERFHLMC 15YR UMBS SUPER | Fixed Income / Cash | 0.14% | 11.8% | |
| 14 | GNMA2 SF 30YRGNMA2 SF 30YR | Fixed Income / Cash | 0.10% | 11.9% | |
| 15 | GNMA II 30YR SF - JUMBO-CONFORMINGGNMA II 30YR SF - JUMBO-CONFORMING | Fixed Income / Cash | 0.09% | 12.0% | |
| 16 | FHLMC 15YR UMBSFHLMC 15YR UMBS | Fixed Income / Cash | 0.09% | 12.1% | |
| 17 | FNMA 30YRFNMA 30YR | Fixed Income / Cash | 0.08% | 12.1% | |
| 18 | FHLMC 30YR UMBS RVS REMIC SUPERFHLMC 30YR UMBS RVS REMIC SUPER | Fixed Income / Cash | 0.08% | 12.2% | |
| 19 | FGOLD 30YR GIANTFGOLD 30YR GIANT | Fixed Income / Cash | 0.06% | 12.3% | |
| 20 | FNMA 15YR UMBS SUPERFNMA 15YR UMBS SUPER | Fixed Income / Cash | 0.05% | 12.3% | |
| Total (top 20) | 12.3% | ||||
Check Holdings Overlap
Sign in to see if this ETF's holdings overlap with stocks already in your portfolio. Knowing your total exposure helps avoid accidental over-concentration.
Sign In to Check OverlapInvestment CalculatorSee what investing in MBB might be worth
$
You invest
$10,000
Estimated gain
$407
Final value
$10,407
Projections assume returns compound at the chosen CAGR consistently for 10 years, actual returns will vary year-to-year. Past performance is not a guarantee of future results.
Key Concepts to UnderstandFive things that drive ETF performance more than anything else
Net Assets (AUM)
Total money the ETF manages. Larger AUM usually means tighter bid-ask spreads and lower closure risk. ETFs under $50M are sometimes liquidated by the issuer.
Learn more →NAV
Net Asset Value, the per-share value of everything the ETF owns minus what it owes, calculated end-of-day. The trading price can drift slightly above (premium) or below (discount) NAV during the day.
Learn more →Tracking Error
How closely the ETF's returns match its benchmark. Index ETFs aim for near-zero tracking error; high tracking error in an index fund usually signals fees, sampling, or poor management.
Learn more →Total Return
Capital gain + reinvested dividends. The headline price chart only shows the price part, total return is what you actually pocket, and is the only fair way to compare ETFs across asset classes.
Learn more →Similar ETFs
About This ETF
Provider
BlackRock (iShares)
Asset Class
Fixed Income
Top Sector
Fixed Income / Cash (95.2%)
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.
US ETF data is for educational purposes only. Past performance does not guarantee future returns. Exchange-traded funds carry market risk and may lose value. Read the prospectus and consult a registered investment advisor before investing. Equiscale does not provide investment advice.