How do you value a mortgage REIT?

On book value, through justified price-to-book. Build core earnings from net spread times earning assets, less operating cost, and divide by equity to get sustainable core return on equity (ROE). Fair P/B is (ROE - g) / (cost of equity - g), and fair value per share is book value per share times that multiple. Commercial real estate lenders swap the spread build for distributable earnings after charge-offs.

What is a normal price-to-book for a mortgage REIT?

The primer reads P/B in four illustrative bands: below 0.9x is a deep discount, 0.9-1.0x a discount, 1.0-1.1x around fair and above 1.1x a premium. An agency carry book whose economic return compounds book reads around 1.0-1.1x, while hybrid and commercial lenders often trade at 0.7-1.0x because credit and payout quality dominate. The bands are illustrative screening thresholds, not an industry median.

Why do mortgage REITs trade below book value?

Because a book that earns less than its cost of equity is worth less than its book. At 7.0x leverage and a 1.50% net spread, sustainable ROE is 10.5% against an 11.5% cost of equity, so fair P/B is 0.91x. On commercial lenders, a sub-0.9x multiple often reflects book cuts the market expects from charge-offs and reserves.

What is economic return for a mortgage REIT?

Ending book value per share less beginning book value, plus dividends, divided by beginning book value. It is the standard backward-looking scorecard. A strong year capitalises one-off mark gains that will not repeat, so value the book on repeatable carry instead.

How do you compare mortgage REIT leverage?

Only on the same definition. Economic leverage counts debt plus forward exposure over equity; at-risk leverage counts repo plus net TBA positions over tangible equity. The primer's 7-8x screen applies to at-risk-style ratios only, so an economic-leverage figure below that band is a different ratio and cannot be read against it without relabelling.

Real Estate · Mortgage REITs

Mortgage REIT Sector Primer

Mortgage REIT primer with an Excel valuation model. Covers agency carry, book value, leverage, CPR, duration risk, MSRs and CRE credit.

2026 Edition · data as of June 2026

pages: 40
sections: 15
model sheets: 13

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Inside the primer

The 15-section contents, a worked valuation page, and the Excel dashboard.

Sample page from the Mortgage REIT Sector Primer — Section 08, the worked justified price-to-book: sustainable core ROE of 10.5% bridged to a 0.91x fair P/B against an 11.5% cost of equity.

01 How Mortgage REITs Make Money
02 Listed mREIT Types
03 The Rate and Credit Cycle Ladder
04 Segments and Sub-Markets
05 Revenue Drivers: Generic Spread Build
06 Cost Structure: Spread, Leverage and Opex
07 Valuation Frameworks
08 Worked Example: Justified Price-to-Book
09 Stress Tests and Worked Archetypes
10 Applied Cases: Agency Carry
11 Applied Cases: Hybrid and CRE Lending
12 The Companies in This Primer
13 Key Metrics and Screening
14 Risks, Benchmarks and Case Study
15 Glossary and Cheat Sheet

Worked examples and applied cases · 40 pages · 15 sections · 2 worked valuations

The Excel model

Sample view from the Mortgage REIT Sector Primer Excel model — The model's Dashboard: BVPS, core per share, dividend coverage, book-mark hit, sustainable core ROE, justified P/B and fair value on one screen.

Educational material. This primer and its model are not investment advice or a recommendation to buy or sell any security, and they are not personalised. Worked valuations use illustrative calibrations, not fair-value estimates for any company.

Mortgage REITs own paper, not buildings. They borrow short, hold MBS, mortgage servicing rights or commercial loans, and keep the net interest or credit spread after hedges and funding. Equity REIT NAV and a generic DCF miss that story: the market prices these names on book value per share, the path of that book through rate and credit cycles, and the price-to-book multiple that votes on what comes next.

Mortgage REIT valuation benchmarks by book type

What sits on the balance sheet decides the multiple of book the market will pay. These are the primer's own illustrative screening ranges, for orientation only.

Book type	Primary lens	Typical price-to-book	Other benchmarks
Agency carry	Justified P/B from sustainable core ROE	1.0-1.1x when economic return compounds book	Net spread 1.35-2.00%; economic return 18-23%; at-risk leverage 7-8x
Hybrid servicing and origination	P/B with coverage on earnings available for distribution	0.7-1.0x	Servicing scale and how the servicing-rights marks behave
Commercial real estate lending	P/B against distributable earnings after charge-offs	0.7-1.0x	Dividend coverage after charge-offs; office mix on the disclosed basis; non-accrual trend

The primer prices equity at an 11.5% cost of equity: the 4.50% 10-year Treasury plus about 7% for a levered book. Below 0.9x the market usually expects book stress or has an unresolved credit concern. Spread and scale that lift sustainable ROE above the cost of equity move a book up the range; leverage stress, an uncovered dividend or a rising count of non-accruing loans move it down. Rate marks sit in the background: the primer's through-cycle agency MBS spread is 100 basis points, stressed to 160.

Worked example: a justified price-to-book valuation

Take a hypothetical agency book with $10,000 million of common equity, 500 million shares, 7.0x at-risk leverage, a 1.50% net interest spread after funding and hedges, and $150 million of operating cost.

Step	Amount
Earning assets ($10,000M equity x 8.0)	$80,000M
Net interest income at a 1.50% spread	$1,200M
Less operating expense	-$150M
Core earnings	$1,050M
Sustainable core ROE ($1,050M / $10,000M)	10.5%
Justified P/B at an 11.5% cost of equity, zero growth	0.91x
Book value per share	$20.00
Fair value per share	$18.26

The book earns 10.5% against an 11.5% hurdle, so it is worth less than its own book. Solve for the spread that makes ROE equal the cost of equity and you get 1.625%: this book needs another 12.5 basis points of net spread before it justifies trading at book. Core earnings of $2.10 per share still cover a $1.90 dividend 1.11 times, so the payout looks safe while the valuation sits below book.

The leverage that lifts the carry also magnifies the marks. A 25 basis point spread widening on assets with a five-year duration marks $1,000 million off book: 10% of equity, close to a full year of core earnings, taking book value to $18.00 per share in one quarter. The primer adds the ROE and cost-of-equity grid, the book-erosion grid and a commercial lender priced on distributable earnings; the Excel model reruns the whole bridge on your own book.

Which mortgage REIT valuation method fits which company

Company type	Primary method	Check with	Why
Agency carry	Justified P/B from sustainable core ROE	Net spread trend and prepayment speed (CPR) drift	Rate marks and hedge quality drive near-term book
Hybrid servicing and origination	P/B with coverage on earnings available for distribution	Servicing-rights mark behaviour	Offsetting engines can hide inside one multiple
Commercial real estate lender	P/B against distributable earnings after charge-offs	Non-accruals and office mix on the disclosed basis	Credit migration and reserves decide where book goes
Any mREIT, looking back	Economic return: book change plus dividends	Justified P/B	A strong year capitalises one-off mark gains, so it explains the past rather than prices the future

What the full primer adds

The primer separates the three earnings engines (agency carry, hybrid origination and servicing, CRE lending), then builds the valuation method around them: spread construction, leverage that is defined inconsistently across filers, CPR and duration risk, and dividend coverage that means different things on each model. A worked justified price-to-book walk and stress tests turn the framework into numbers you can recompute; applied cases put Annaly-style agency books and Rithm-style hybrids beside CRE lenders so the same screens read correctly on each book type. Screening metrics and red flags close the method.

Free guides on agency vs hybrid models, book value per share, CPR and prepayment risk, leverage definitions, and CRE office exposure teach the building blocks; research profiles for NLY, AGNC, RITM, STWD, and BXMT run the same screens on filed results. The companion Excel model spans thirteen sheets, from the spread build and justified-P/B engine to the sensitivity maps, takes its rate assumptions from one sheet, and reruns the full P/B and spread framework on any name in the sector.

Sheets: README, Assumptions, Spread Build, RI Engine, Coverage, BV Sensitivity, Spread Sensitivity, BV Bridge, Prepay Sensitivity, P-B Map, Valuation, Coverage Honesty, Dashboard.

Mortgage REIT valuation: free guides

Mortgage REIT valuation FAQ

How do you value a mortgage REIT?: On book value, through justified price-to-book. Build core earnings from net spread times earning assets, less operating cost, and divide by equity to get sustainable core return on equity (ROE). Fair P/B is (ROE - g) / (cost of equity - g), and fair value per share is book value per share times that multiple. Commercial real estate lenders swap the spread build for distributable earnings after charge-offs.
What is a normal price-to-book for a mortgage REIT?: The primer reads P/B in four illustrative bands: below 0.9x is a deep discount, 0.9-1.0x a discount, 1.0-1.1x around fair and above 1.1x a premium. An agency carry book whose economic return compounds book reads around 1.0-1.1x, while hybrid and commercial lenders often trade at 0.7-1.0x because credit and payout quality dominate. The bands are illustrative screening thresholds, not an industry median.
Why do mortgage REITs trade below book value?: Because a book that earns less than its cost of equity is worth less than its book. At 7.0x leverage and a 1.50% net spread, sustainable ROE is 10.5% against an 11.5% cost of equity, so fair P/B is 0.91x. On commercial lenders, a sub-0.9x multiple often reflects book cuts the market expects from charge-offs and reserves.
What is economic return for a mortgage REIT?: Ending book value per share less beginning book value, plus dividends, divided by beginning book value. It is the standard backward-looking scorecard. A strong year capitalises one-off mark gains that will not repeat, so value the book on repeatable carry instead.
How do you compare mortgage REIT leverage?: Only on the same definition. Economic leverage counts debt plus forward exposure over equity; at-risk leverage counts repo plus net TBA positions over tangible equity. The primer's 7-8x screen applies to at-risk-style ratios only, so an economic-leverage figure below that band is a different ratio and cannot be read against it without relabelling.