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iShares MBS ETF (MBB)



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Upturn Advisory Summary
08/14/2025: MBB (2-star) has a low Upturn Star Rating. Not recommended to BUY.
Analysis of Past Performance
Type ETF | Historic Profit 6.85% | Avg. Invested days 46 | Today’s Advisory Consider higher Upturn Star rating |
Upturn Star Rating ![]() ![]() | Upturn Advisory Performance ![]() | ETF Returns Performance ![]() |
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Key Highlights
Volume (30-day avg) - | Beta 1.12 | 52 Weeks Range 87.68 - 94.39 | Updated Date 06/29/2025 |
52 Weeks Range 87.68 - 94.39 | Updated Date 06/29/2025 |
Upturn AI SWOT
iShares MBS ETF
ETF Overview
Overview
The iShares MBS ETF (MBB) seeks to track the investment results of an index composed of investment-grade mortgage-backed pass-through securities. It provides exposure to the U.S. mortgage-backed securities market with a focus on agency securities. The fund's investment strategy involves replicating the Bloomberg US MBS Index.
Reputation and Reliability
iShares is a well-regarded ETF provider with a long track record and significant assets under management, known for its reliable fund management.
Management Expertise
BlackRock, the parent company of iShares, possesses extensive expertise in fixed-income portfolio management and ETF operations.
Investment Objective
Goal
Seeks to track the investment results of the Bloomberg US MBS Index, providing exposure to the U.S. mortgage-backed securities market.
Investment Approach and Strategy
Strategy: The ETF aims to replicate the Bloomberg US MBS Index, investing in a diversified portfolio of mortgage-backed securities.
Composition Primarily composed of U.S. agency mortgage-backed securities, including securities issued by Fannie Mae, Freddie Mac, and Ginnie Mae.
Market Position
Market Share: iShares MBS ETF holds a significant market share within the mortgage-backed securities ETF market.
Total Net Assets (AUM): 5337000000
Competitors
Key Competitors
- Vanguard Mortgage-Backed Securities ETF (VMBS)
- SPDR Portfolio Mortgage Backed Bond ETF (SPMB)
- PIMCO Mortgage Backed Securities ETF (MBB)
Competitive Landscape
The MBS ETF market is dominated by a few large players, with iShares holding a leading position. Advantages of MBB include its large AUM and liquidity, while a disadvantage might be its slightly higher expense ratio compared to some competitors. Competition centers around expense ratios, tracking error, and trading volume.
Financial Performance
Historical Performance: Historical performance data is available from various financial data providers, reflecting the fluctuations of the mortgage-backed securities market.
Benchmark Comparison: The ETF's performance is typically compared against the Bloomberg US MBS Index to assess its tracking effectiveness.
Expense Ratio: 0.04
Liquidity
Average Trading Volume
The iShares MBS ETF exhibits high liquidity, reflected by its substantial average trading volume, facilitating easy entry and exit for investors.
Bid-Ask Spread
The bid-ask spread is generally tight, contributing to reduced trading costs for investors.
Market Dynamics
Market Environment Factors
Economic indicators such as interest rates, inflation, and housing market conditions significantly influence the performance of mortgage-backed securities and, consequently, the iShares MBS ETF.
Growth Trajectory
The growth trajectory of the ETF is tied to the overall health and stability of the mortgage market, with trends influenced by factors like refinancing activity and new home sales.
Moat and Competitive Advantages
Competitive Edge
The iShares MBS ETF benefits from the strong reputation and established presence of iShares in the ETF market. Its large asset base provides significant liquidity, which is attractive to institutional investors. The ETF's focus on agency mortgage-backed securities offers a relatively low-risk exposure to the housing market. Furthermore, BlackRock's expertise in fixed income management adds credibility. This, combined with the economies of scale achieved through its size, makes it a formidable competitor.
Risk Analysis
Volatility
The ETF's volatility is generally moderate, reflecting the relatively stable nature of mortgage-backed securities compared to equities.
Market Risk
The primary market risks include interest rate risk (as rising rates can decrease the value of MBS) and prepayment risk (the risk that homeowners will refinance their mortgages when rates fall).
Investor Profile
Ideal Investor Profile
The iShares MBS ETF is suitable for investors seeking income and diversification through exposure to the U.S. mortgage-backed securities market.
Market Risk
This ETF is appropriate for long-term investors who want a stable income stream and are comfortable with moderate interest rate risk.
Summary
The iShares MBS ETF (MBB) offers a liquid and cost-effective way to access the U.S. mortgage-backed securities market. It tracks the Bloomberg US MBS Index and is primarily composed of agency MBS. While it offers a relatively stable income stream, investors should be aware of interest rate and prepayment risks. Its substantial AUM and tight bid-ask spread make it an attractive choice for income-seeking investors and those looking for portfolio diversification. The fund benefits from BlackRock's expertise and the iShares brand.
Peer Comparison
Sources and Disclaimers
Data Sources:
- iShares official website
- Bloomberg
- Morningstar
- ETFdb.com
Disclaimers:
The information provided is for informational purposes only and does not constitute financial advice. Investment decisions should be based on individual circumstances and consultation with a qualified financial advisor. Past performance is not indicative of future results.
AI Summarization is directionally correct and might not be accurate.
Summarized information shown could be a few years old and not current.
Fundamental Rating based on AI could be based on old data.
AI-generated summaries may have inaccuracies (hallucinations). Please verify the information before taking action.
About iShares MBS ETF
Exchange NASDAQ | Headquaters - | ||
IPO Launch date - | CEO - | ||
Sector - | Industry - | Full time employees - | Website |
Full time employees - | Website |
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.

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