Does an mREIT count as my real estate holding or my bond holding

Read the liabilities side and the question mostly answers itself. What sits under the portfolio is short term borrowing, often repo, which has to be rolled over on a regular cycle, and that's the part that decides how the thing behaves in a bad month. A bond fund holding the same mortgage-backed securities unlevered will move, and a mortgage REIT holding them with several turns of borrowed money will move a multiple of that.

So I don't file it under fixed income. Calling it credit makes people size it like it's the calm part of the account. If your worry is exactly the one you named in the post, the mislabeling risk is worse in that direction than in the real estate direction.

I'm new enough that I didn't know a company could own mortgages without owning any property, so this thread already taught me something. If the borrowing has to be rolled over, what happens if the lenders want more collateral at the same time the securities have dropped in value? That sounds like the moment where the label stops mattering.

@rigging, that's the margin call scenario, and it's the one that turns a rate move into forced selling. Lenders ask for more collateral, the company either posts it or sells assets into a market that's already down, and book value takes the hit. It's a real mechanic, and it's why the amount of borrowing and the maturity profile of the borrowing are worth as much reading time as the yield.

@sable, own bucket, and I'd label the bucket by what drives the return rather than by what the assets are. Underwriting these is a spread and duration exercise. I want to know the spread between asset yield and funding cost, how much of the rate exposure is hedged and against what kind of move, and how much borrowed money sits behind it. None of those questions come up when I look at an apartment operator, and only the first two come up with a plain bond fund.

The practical version of your problem: if the sheet has a real estate line and a credit line, both of them will lie to you about mortgage REITs. Give it a third line and write the three numbers you'll check every quarter next to it.