High-yield spreads

A high-yield spread is the extra yield, measured in basis points, that investors demand for holding junk-rated corporate bonds instead of US Treasuries of the same maturity. It is the public bond market's running price on the risk that companies stop paying, quoted to the basis point and updated every day. When the number is low, the market is saying it expects almost nothing to go wrong. The interesting question is always whether the things going wrong are inside the index.

How it works

A Treasury is the reference point because the US government can always print the dollars it promised you. Everyone else has to earn them. The gap between what a risky borrower has to pay and what the government pays for the same maturity is the credit spread, and for bonds rated below BBB- — junk, high yield, speculative grade, same thing — it is the high-yield spread.

The arithmetic is trivial. If a five-year Treasury yields 4% and a five-year junk bond yields 7%, the spread is 3 percentage points, or 300 basis points. (Illustration, not data.) A basis point is one hundredth of a percentage point, which is how you can tell you have wandered into a bond conversation.

What gets quoted in the press is an index level: an average across hundreds of bonds, usually option-adjusted so that call features do not distort the comparison. Bond prices and spreads in opposite directions. If investors get nervous and sell, prices fall, yields rise, and the spread widens. If they are relaxed and hunting for income, they bid prices up and the spread tightens. Spreads therefore compress in booms and blow out in panics, and they do it violently.

That sensitivity is why the number is treated as a thermometer for corporate credit generally. It is a decent one. But it measures the temperature of a specific room — publicly traded, index-eligible bonds issued by companies that chose to borrow in that market — and the room has been emptying for a decade as borrowers migrated to , where nothing trades and there is no spread to quote.

Why it matters to this crash

The flatness of high-yield spreads through August 2026 is the single most load-bearing fact in our coverage, because it is the reason nothing feels like a crisis yet.

The readings we have logged sit in a narrow band and barely move: 270bp on 19 August, unchanged on the week, with investment grade at 81bp (our dispatch on the power trade cracking recorded the same stillness); 275bp earlier in the session; 273bp in the non-accrual piece that same day. On 18 August we noted spreads at 2.67% and tightening (here).

Set that against what the same dispatches were reporting. Median at the twenty largest listed rose from 2.0% to 2.8% of cost in a single quarter, the highest since 2017. Fitch put private credit defaults at a record in July. Blackstone-backed QTS sold $3.9bn of five-year data-centre notes rated Baa3/BBB- at a yield of about 7.63% — an investment-grade rating at a junk-market price. Equity investors sold the managers who originate this paper by 5–9% in a week.

So public credit is priced for calm while three other markets are not. There are two explanations and they are not exclusive. One is that bond investors are right and everyone else is panicking. The other is that the deterioration is happening in places the index cannot see: in loans held at a the manager chooses, in concessions and amortisation instead of defaults — 's Sophos refinancing, which we covered, is exactly this — and in debt sitting in vehicles and leases that no index tracks. Losses resolved by negotiation never widen a spread. They just show up all at once later, when the negotiation fails.

A spread cannot price a bond that does not exist.

What would make this dangerous

Watch for the index and the private market converging, in either direction.

High-yield spreads moving 100 basis points wider in under a month would mean the public market has stopped believing the private , and refinancing costs reprice for every leveraged borrower simultaneously. That is the fast version.

The slow version is more likely and worse: spreads staying pinned near 270bp while non-accruals keep climbing and more deals price like QTS — investment-grade paper clearing at junk yields. That gap is the market telling you the rating and the risk have come apart, one deal at a time, with the index averaging the evidence away.

The specific tell would be a large private credit default that forces a public bond to reprice: a borrower with both syndicated and direct-lent debt, where the traded piece finally marks to where the untraded piece already is. Until something makes that comparison unavoidable, the spread will keep saying everything is fine, because everything in it is.

As seen in

Every dispatch we have filed that touches this. Newest first.

6.13% against 0.49%2026-08-25
The bottom of the consumer market is at crisis-era delinquency rates while the firms lending to it trade near highs — the divergence resolves when ABS funding, not the borrower, turns.
Investment grade at a junk-bond price2026-08-25
The gap between the rating and the yield is the market's estimate of how much of the AI buildout's risk the rating agencies are not capturing.
Now they are selling the electricity2026-08-24
Power contracts were the most concrete evidence that AI demand was real; the market is now discounting them faster than it is discounting the chipmakers.
The stress moved into the metal2026-08-24
When one market is being managed, the risk premium does not disappear — it reappears in the market that is not.
Record subprime delinquency, record subprime lending2026-08-23
Household credit stress at 2008-plus levels is currently being absorbed by pricing rather than by capital, which works until the ABS market disagrees.
Software loans, marked down where nobody trades2026-08-23
This is the first sign in a listed private-credit portfolio that the AI boom is producing credit losers as well as winners, and it arrived as a valuation markdown rather than a default.
Yields did not fall. The dollar did.2026-08-22
A government that suppresses the price of its own debt has not removed the fiscal risk, only moved it to the exchange rate.
The index is fine. Its financiers are not.2026-08-21
The AI buildout depends on continuous refinancing by companies whose equity is the junior tranche of every future deal, and that equity is being marked down while the index is not.
Data-centre debt is getting more expensive, deal by deal2026-08-20
Long-dated project debt on single-tenant AI buildings is being absorbed by insurance and annuity balance sheets, where nobody has to mark it until a tenant fails.
Subprime auto is past its 2008 peak. The lenders noticed.2026-08-20
Subprime auto stress above its 2008 level, in a labour market that is still near full employment, means the credit deterioration is structural rather than cyclical.
The rater, not just the rated2026-08-20
If the ratings on affiliated private loans held by annuity writers cannot be relied on, the problem is not one insurer but the valuation method the whole insurance-plus-private-credit complex uses.
One in thirty-six private loans has stopped paying2026-08-19
Private credit's whole promise is that loans held to maturity do not need marking; non-accruals are the one number that cannot be smoothed, and it is at a decade high.
Record short squeeze in bitcoin; AI debt goes the other way2026-08-19
The equity market has started to price the financing structure rather than the story, which is usually the first stage of a credit repricing and not the last.
The market has split the AI trade in two2026-08-19
The AI selloff is concentrated precisely in the companies whose capex is funded by other people's debt, which is where the losses would land first.
Two frauds, one mechanism: collateral pledged twice2026-08-18
Non-bank lending has scaled faster than the plumbing that verifies collateral exists, and both recent blow-ups turned on the same trick.
An investment-grade bond at a junk price
The first sustained sign that the marginal lender to AI infrastructure is charging a risk premium, while the rest of credit stays asleep.
Investment grade, junk price
The bond market is now pricing top-rated data-centre debt like junk while the ratings say otherwise, and the equity of everyone standing behind the lease is falling.
Nobody wants to refinance Sophos
When the buyer of last resort for LBO debt steps back and the sponsor refuses to add equity, losses get resolved through terms rather than defaults — which is why nothing shows up in spreads until it shows up all at once.
Subprime lenders' shares up, subprime borrowers not
Consumer credit stress is now visible in the data and invisible in the prices of the companies underwriting it.
The loans are going bad; the funds are not marked down
Credit stress in private lending is now measurable, but it is showing up in manager earnings expectations rather than in the value of the loans themselves.
The power trade cracks, the credit doesn't
The equity market has started to discount the AI buildout while the credit market is still funding it at investment-grade terms.
Two point eight per cent
Non-accruals are the earliest hard number in a market that otherwise reports its own valuations, and they moved a lot in one quarter.

Written 2026-08-21. Crashopedia entries are drafted from sourced evidence, fact-checked against it, and edited by hand. If something here is wrong, it is wrong in git and can be fixed there.