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Mortgage REITs can underperform when interest rates change because the value and income of their mortgage assets, their borrowing costs, and their hedges do not move together or at the same speed. Rising rates may increase funding costs, reduce mortgage-security values, and slow borrower prepayments. Falling rates may speed prepayments and leave the REIT reinvesting returned principal at lower yields. Hedges can reduce selected rate exposures, but they do not eliminate mortgage-spread, basis, prepayment, extension, liquidity, or credit risks.
How a mortgage REIT is exposed to rates
A mortgage REIT (mREIT) invests in mortgages or mortgage-related securities and often finances those assets with borrowings. Its results therefore depend on both sides of its balance sheet: income and market value from its investments, and the cost and availability of its financing. A rate move can affect each side differently, so the direction of the move alone does not determine whether a particular mREIT will outperform or underperform.
One useful measure is the net interest spread: broadly, the yield earned on investments minus the cost of financing them. If an mREIT’s financing costs rise faster than the yields on its existing fixed-rate assets can adjust, the spread can narrow and pressure earnings. Dynex Capital describes this mismatch and the potential for lower mortgage-backed securities (MBS) values and book value during rising-rate periods in its 2024 Form 10-K. The effect depends on asset mix, liability terms, hedges, and management actions; borrowing costs do not move identically across all mREITs.
Why rising and falling rates create different problems
When rates rise
Higher rates can make existing fixed-rate mortgage securities less valuable relative to newer investments with higher yields. At the same time, borrowers are less likely to refinance into cheaper loans, so principal returns more slowly. That slower prepayment can extend the expected life of an asset whose market value has fallen, leaving the mREIT exposed for longer than expected.
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If financing costs reprice more quickly than asset income, the net interest spread may also shrink. A REIT can therefore face pressure on both earnings and book value, although the outcome varies by portfolio and hedge position.
When rates fall
Lower rates can increase the value of some fixed-rate mortgage assets, but borrowers may refinance or repay sooner. The mREIT then receives principal earlier than expected and may have to reinvest it at lower yields. Faster prepayments can also accelerate the amortization of premiums paid for mortgage securities, affecting reported income and returns.
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This borrower prepayment option makes mortgage cash flows behave differently from a conventional fixed-maturity bond. The resulting pattern—less price appreciation when rates fall and greater duration when rates rise—is often called negative convexity. The key idea is that the timing of mortgage cash flows changes with rates, not just the discount rate applied to a fixed schedule.
Why hedges do not guarantee protection
Many mREITs use derivatives or other financial instruments to offset selected benchmark interest-rate exposures. A hedge may help reduce sensitivity to a particular rate move, but it can be partial, changed over time, or designed to protect earnings rather than book value. It may also be more effective in some scenarios than others.
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One free scan finds every outdated or missing driver and matches the right update for your exact hardware.Free scan · exact hardware matchMost importantly, benchmark rates are not the only driver of mortgage-security prices. The difference between mortgage yields and benchmark yields—the mortgage spread—can widen or narrow independently. A hedge linked to benchmark rates may offset some of a rate move while failing to offset a widening mortgage spread or a change in liquidity. This is spread risk or, where related prices move imperfectly, basis risk.
AGNC Investment Corp. states in its 2025 Form 10-K that its hedging strategies generally are not designed to protect net book value from spread risk. That is AGNC’s disclosure about its own approach, not a description of every mREIT’s hedge program. AGNC also describes choices not to fully hedge rate, prepayment, or extension risk, and notes that some hedges intended for larger moves may be less effective for smaller changes.
How leverage and liquidity can amplify losses
Because mREITs often use secured borrowing, a decline in the market value of mortgage collateral can create financing pressure. Depending on contract terms and market conditions, a lender or counterparty may reduce available financing or require additional collateral. If an mREIT cannot meet a liquidity need through other means, it may have to sell assets; a sale during a downturn can turn an unrealized decline into a realized loss and may make it harder to maintain the portfolio.
Invesco Mortgage Capital’s 2025 Form 10-K discusses liquidity risk and the possibility of asset sales under extreme conditions. This is a conditional risk, not evidence that every mREIT will face a margin call or forced sale after a rate change.
Why portfolio type matters
“Mortgage REIT” covers businesses with different assets and risk profiles. Agency MBS, whose principal and interest payments carry government or agency backing, are not exposed to the same credit risks as non-agency securities or mortgage loans. But agency backing does not remove market-value, spread, prepayment, extension, or financing risks.
Credit-oriented holdings add another layer. PennyMac Mortgage Investment Trust distinguishes the rate sensitivity of agency and senior non-agency MBS from the credit sensitivity of credit-risk-transfer and subordinate securities in its 2025 Form 10-K. For a credit-heavy mREIT, defaults, borrower quality, and property or loan performance may affect results alongside interest rates; a weak return should not automatically be attributed to rate exposure alone.
How to compare rate sensitivity between mREITs
When evaluating two mREITs, compare the underlying exposures rather than assuming that a single rate forecast applies equally to both.
- Assets: Identify the balance among agency MBS, non-agency securities, whole loans, commercial loans, and credit-linked investments.
- Funding: Check borrowing types, maturities, repricing behavior, and reliance on secured financing.
- Leverage and liquidity: Consider how much borrowing supports the portfolio and what collateral or cash pressures could follow a market shock.
- Hedges: Look at which rate exposures are hedged, hedge duration, and the remaining exposure to spreads, basis changes, prepayments, and extensions.
- Scenario assumptions: Read sensitivity tables as model estimates for a specific portfolio and date, not as forecasts or guarantees. Invesco describes a static-portfolio analysis using assumed parallel yield-curve shifts and constant asset and financing spreads in its 2025 filing.
Company-specific sensitivity figures are not directly interchangeable: they may use different portfolio dates, assumptions, and scenario designs. No single figure established in the filings cited here serves as a broad, independently comparable measure of sector-wide rate sensitivity.
What to take from an underperformance report
When an mREIT reports weaker earnings, a lower book value, or a poor share-price return during a rate shift, separate the possible drivers. Ask whether the change came from funding costs, benchmark-rate exposure, mortgage spreads, prepayment behavior, leverage or liquidity, or credit performance. The mix can differ materially from one company to another, and rate hedges do not make these exposures interchangeable.
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