State Street SPDR Portfolio Mortgage Backed Bond ETF (SPMB) Fund Overview
Educational signal · not a buy or sell recommendation · How to read this
Beta 1.13: the stock has moved about 13% more than the S&P 500.
For informational purposes only. Not financial advice. Machine-generated analysis by Stock Expert AI — model gemini-2.0-flash, generated Mar 17, 2026. Editorial oversight is systemic, not page-by-page. Editorially accountable: Sedat ANAK, Founder and Editor-in-Chief. Data sources: Financial Modeling Prep, Yahoo Finance, SEC EDGAR
Quick AnswerState Street SPDR Portfolio Mortgage Backed Bond ETF (SPMB) trades at $21.05. The State Street SPDR Portfolio Mortgage Backed Bond ETF (SPMB) seeks to replicate the performance of the Bloomberg U.S. MBS Index. Sector: Financials.
Price as of · Last analyzed: Mar 17, 2026Analyst Coverage for SPMB: SPMB does not currently have published analyst price targets in our coverage universe. This is common for smaller-cap names with limited Wall Street coverage.
State Street SPDR Portfolio Mortgage Backed Bond ETF (SPMB) Financial Services Profile
State Street SPDR Portfolio Mortgage Backed Bond ETF (SPMB) provides low-cost exposure to U.S. agency mortgage-backed securities, tracking the Bloomberg U.S. MBS Index. As part of State Street's SPDR Portfolio ETFs, it serves as a core building block for diversified investment portfolios, rebalancing monthly to maintain index alignment.
What Is the Investment Thesis for SPMB?
SPMB offers a straightforward investment proposition: low-cost exposure to the U.S. agency mortgage-backed securities market. With a market cap of $7.00 billion and a beta of 1.13, SPMB provides a way to track the Bloomberg U.S. MBS Index. The ETF's value is intrinsically linked to the performance of the underlying mortgage-backed securities and broader interest rate environment. Growth catalysts include increased demand for fixed-income assets and a stable housing market. However, potential risks involve interest rate volatility and changes in mortgage prepayment speeds, which could impact the ETF's yield and overall return. Investors should monitor these factors when considering SPMB as part of their investment strategy.
Based on FMP financials and quantitative analysis
SPMB Key Highlights
Market Cap of $7.00 billion indicates substantial investor interest and liquidity.
- Beta of 1.13 suggests SPMB's price is slightly more volatile than the overall market.
- The ETF provides low-cost access to agency mortgage-backed securities, appealing to cost-conscious investors.
- Monthly rebalancing ensures the ETF remains aligned with the Bloomberg U.S. MBS Index.
- Exposure to agency mortgage-backed securities offers a degree of credit risk mitigation due to GSE guarantees.
Who Are SPMB's Competitors?
SPMB is benchmarked below against 5 industry peers on price, market cap, and our AI MoonshotScore.
| Company | Price | Change | Market Cap | MoonshotScore |
|---|---|---|---|---|
| EWY iShares MSCI South Korea ETF | $191.88 | +3.10% | $14.5B | — |
| HEFA iShares Currency Hedged MSCI EAFE ETF | $46.55 | +0.87% | $7.32B | — |
| IJS iShares S&P Small-Cap 600 Value ETF | $130.39 | +0.93% | $7.83B | — |
| IJT iShares S&P Small-Cap 600 Growth ETF | $163.44 | +1.47% | $7.64B | — |
| IXN iShares Global Tech ETF | $151.94 | +1.42% | $9.51B | — |
AI Score by Stock Expert AI · Price data: FMP / Yahoo Finance
What Are SPMB's Key Strengths?
Low expense ratio attracts cost-conscious investors.
- Exposure to agency mortgage-backed securities provides a degree of credit risk mitigation.
- Tracks a well-known and widely followed index (Bloomberg U.S. MBS Index).
- High liquidity allows for easy trading.
What Are SPMB's Weaknesses?
Returns are limited to the performance of the underlying mortgage-backed securities.
- Susceptible to interest rate risk and prepayment risk.
- No dividend yield may deter some income-seeking investors.
- Beta of 1.13 indicates slightly higher volatility than the overall market.
What Are the Key Risks for SPMB?
Rising interest rates could decrease the value of existing mortgage-backed securities.
- Changes in mortgage prepayment speeds could affect yield and returns.
- Competition from other low-cost bond ETFs.
- Economic downturn could lead to higher mortgage default rates.
What Are SPMB's Competitive Advantages?
- Low-Cost Structure: SPMB's low expense ratio provides a competitive advantage over higher-cost alternatives.
- Index Tracking: The ETF's focus on replicating the Bloomberg U.S. MBS Index ensures consistent and predictable performance.
- Brand Recognition: State Street is a well-established and reputable asset manager, lending credibility to SPMB.
- Liquidity: SPMB's high trading volume provides investors with easy access to buy and sell shares.
What Does SPMB Do?
The State Street SPDR Portfolio Mortgage Backed Bond ETF (SPMB) is designed to mirror the price and yield performance of the Bloomberg U.S. MBS Index. As a component of State Street's SPDR Portfolio ETFs, SPMB provides investors with a cost-effective means to access a broad range of U.S. agency mortgage-backed securities. These securities are investment-grade and represent a significant portion of the overall bond market. The ETF's structure allows investors to gain exposure to this asset class without directly purchasing individual mortgage-backed securities, simplifying the investment process and potentially reducing transaction costs. SPMB is rebalanced on the last business day of each month to ensure its holdings remain aligned with the composition of the Bloomberg U.S. MBS Index. This rebalancing process helps the ETF maintain its tracking accuracy and investment objective. The ETF's focus on agency mortgage-backed securities means that the underlying mortgages are guaranteed by government-sponsored enterprises (GSEs) like Fannie Mae and Freddie Mac, offering a degree of credit risk mitigation compared to non-agency mortgage-backed securities.
What Products and Services Does SPMB Offer?
- Tracks the performance of the Bloomberg U.S. MBS Index.
- Provides exposure to agency mortgage-backed securities.
- Offers a low-cost investment option for accessing the U.S. bond market.
- Rebalances its portfolio monthly to maintain index alignment.
- Invests primarily in investment-grade mortgage-backed securities.
- Offers diversification within the fixed-income asset class.
How Does SPMB Make Money?
- Generates revenue through management fees charged to investors.
- Aims to replicate the performance of the Bloomberg U.S. MBS Index.
- Reinvests proceeds from maturing or prepaid mortgages into new securities.
- Manages portfolio risk through diversification and adherence to index guidelines.
What Industry Does SPMB Operate In?
SPMB operates within the asset management industry, specifically focusing on fixed-income ETFs. The market for bond ETFs has grown substantially as investors seek diversified and liquid exposure to various segments of the bond market. The competitive landscape includes other ETFs that track similar mortgage-backed securities indices. SPMB's low-cost structure positions it favorably against competitors with higher expense ratios. The overall trend in the asset management industry is towards lower fees and greater transparency, which benefits ETFs like SPMB.
Who Are SPMB's Key Customers?
- Individual investors seeking fixed-income exposure.
- Financial advisors building diversified portfolios for clients.
- Institutional investors looking for efficient access to mortgage-backed securities.
- Retirement funds seeking stable returns.
Research confidence
Thin evidence — scoring coverage unknown. Treat this as a starting point, not a conclusion.
- ● Scoring coverage unknown
- ● Price is current
- ● No filing on record
- ● No analyst coverage
- ● This is an etf, not an operating company
MoonshotScore History
Recorded daily since 2026-08-23 · 41 snapshots
| 2026-08-23 | 47 |
| 2026-08-31 | 47 |
| 2026-09-08 | 47 |
| 2026-09-16 | 47 |
| 2026-09-24 | 47 |
| 2026-10-04 | 47 |
What changed?
The score has stayed at 47.
Over the same 30 days the stock moved -3.7%.
SPMB Financials
Bull Case vs Bear Case
Bull Case
- Low expense ratio attracts cost-conscious investors.
- Exposure to agency mortgage-backed securities provides a degree of credit risk mitigation.
- Tracks a well-known and widely followed index (Bloomberg U.S. MBS Index).
- High liquidity allows for easy trading.
Bear Case
- Returns are limited to the performance of the underlying mortgage-backed securities.
- Susceptible to interest rate risk and prepayment risk.
- No dividend yield may deter some income-seeking investors.
- Beta of 1.13 indicates slightly higher volatility than the overall market.
AI-generated arguments based on insider flow, news sentiment and technicals — not financial advice · March 2026
SPMB Latest News
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Norway Rotates $2.3 Trillion Fund Into Mortgage-Backed Securities
etftrends.com · Sep 4, 2026
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Bank of America Corp DE Purchases 135,391 Shares of SPDR Portfolio Mortgage Backed Bond ETF $SPMB
defenseworld.net · Aug 13, 2026
SPMB Analyst Consensus
Consensus Rating
Aggregated Buy/Hold/Sell recommendations collected by Financial Modeling Prep for SPMB.
Price Targets
Wall Street price target analysis for SPMB.
SPMB MoonshotScore
MoonshotScore is Stock Expert AI's proprietary 0-100 research rating, not a buy or sell recommendation. No MoonshotScore is published for SPMB; grades run from A+ (80-100) to F (below 30).
ETFs that hold SPMB
Funds in our ETF coverage that list SPMB among the top 10 holdings on their fund page, largest weight first. Each weight is the fund's reported holding weight as of the date in its row.
| ETF | Weight | Holdings as of |
|---|---|---|
| Day Hagan / Ned Davis Research Smart Sector Fixed Income ETF (SSFI) | 18.64% |
SPMB Financials Stock FAQ
What does State Street SPDR Portfolio Mortgage Backed Bond ETF do?
The State Street SPDR Portfolio Mortgage Backed Bond ETF (SPMB) aims to replicate the performance of the Bloomberg U.S. MBS Index.
Disclaimer: This content is for informational purposes only and does not constitute investment advice. Always do your own research and consult a financial advisor.
Official Resources
MoonshotScore is not published for this security.
Data provided for informational purposes only.
- Financial data based on available information as of 2026-03-17.