A mortgage REIT is a company that owns mortgage bonds, not property.

It borrows cheaply and short, then buys higher-yielding mortgage bonds, and pockets the gap.

That gap funds fat dividends, often above 10%, and it is also the weak point.

In 2025, mortgage REITs kept paying double-digit dividends.

They fund those bonds mostly in the overnight repo market.

At quarter-end in September 2025, repo rates spiked, raising their cost to borrow.

Mortgage rates near 7% also kept bond prices under pressure.

So the machine kept running, but its funding got more expensive.

The REIT buys mortgage bonds that pay, say, 5% or 6%.

It pays for most of them with short-term repo loans that cost less.

The difference between the two is its profit, the spread.

To make that spread big, it borrows heavily against its bonds.

A few dollars of the REIT's own money can control many dollars of bonds.

By law, a REIT must pay out most of its income, which is why dividends run high.

The first stress point is the funding. Repo loans must be rolled over constantly.

If repo rates spike or lenders pull back, the cheap funding vanishes.

The second is rates. When long rates rise, the REIT's bonds lose value fast.

That can trigger margin calls, forcing the REIT to sell bonds low.

The third is leverage, which magnifies every one of these moves.

The agency-backed bonds a REIT holds carry little default risk, so the assets are solid.

In steady markets, the spread machine works and the dividends are real, which deserves credit.

What can break is the funding and the leverage in a rate shock, as it did in March 2020.

You can watch the gauges. REITs report their leverage and book value each quarter.

A falling book value and rising repo rates are the warning signs.

A mortgage REIT is a leveraged spread machine, safe in its assets but fragile in its funding.

The dividends are real, but they ride on cheap overnight borrowing that can dry up.

The next test is a rate or repo shock. Watch REIT book values and short-term funding rates.