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Credit spreads haven’t confirmed the regime change yet. Here’s what that means.

Last week we looked at how systematic funds respond once they’ve identified a regime shift — rotating out of momentum and into quality, shortening equity duration, and favoring strategies that profit from differences between individual stocks rather than from riding the market higher.

We closed with a bit of a loose end: credit spreads. That’s the one major market signal that has not yet confirmed what the Treasury yield curve, the stock-bond correlation matrices, and the VIX futures curve have been portending.

When the Iran War began on February 28th, high-yield spreads stood around 3.1%. That’s tight by historical standards—and well below levels we typically associate with periods of genuine credit stress. In fact, going into March, the bond market was pricing near-perfection into corporate credit risk.

First, let’s review what credit spreads are and why they can be an important market signal.

When a company borrows money by issuing bonds, it pays a higher interest rate than the U.S. government does on Treasuries. That’s because the credit quality of Treasury bonds is traditionally considered unquestioned.

The difference in interest rates is measured in basis points, where 100 basis points equals one percentage point. And the difference between the interest rate the U.S. government pays versus what a private borrower must pay for the same loan is called the credit spread. It’s a measure of the risk premium: how much extra yield over and above the Treasury yield that investors demand to accept the risk that the borrower might default.

There may be inflation risk, and of course, there’s interest rate risk on Treasury bonds. Especially at longer durations. But there’s no credit risk associated with Treasuries. Unlike corporate and municipal borrowers, who could potentially miss an interest payment or declare outright bankruptcy, the credit risk on U.S. Treasury bonds is priced at essentially zero.

When spreads are tight, it means lenders feel confident in corporate borrowers. They consider corporate borrowers in the aggregate to be healthy, and the risk of default to be low. They believe the economy is humming along, and they are not pricing in significant shocks or economic disruptions.

When spreads are wide - Corporate borrowers are paying much higher interest rates on borrowing than the U.S. government - it means lenders are nervous. They smell trouble on the horizon. And so they demand more compensation in the form of higher interest rates before they’ll lend to anyone who isn’t the U.S. government.

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High-yield spreads - the extra yield on “junk” bonds rated below investment grade - are among the most sensitive barometers in the credit market.

These bonds are issued by companies with weaker balance sheets and less margin for error. They may be smaller, already laden with more debt, have low credit ratings, poor quality earnings or no earnings at all, or uncertain prospects

When the credit market tightens, it’s these borrowers that feel it first and worst: The spread between their bonds and Treasuries widens sharply. It costs them more to borrow money or refinance their debt.

Systemic traders and analysts frequently use the ICE BofA U.S. High Yield Index option-adjusted spread as their go-to credit spread indicator.

Before the Iran war began on February 28, it stood around 3.1% - well above the all-time low of 2.41% reached in June 2007, but and nowhere near the 21.82% peak recorded at the worst of the 2008 financial crisis. By any historical measure, spreads were historically tight.

Historically, credit spreads tend to move later in the economic cycle compared to other indicators we discussed.

And the keyword is “late!”

Historically, credit spreads tend to tighten further into a regime change cycle. They often hold steady even while other indicators are flashing caution - then widen sharply in a massive preference cascade among lenders and bond investors.

So it may not be much of a “canary in a coal mine” indicator. Historically, credit spreads are more like a final signal to get out of the coal mine before it collapses!

Case in point: The 2006-2007 – the end stage for the mortgage and real estate boom, just before the catastrophic collapse that became undeniable in the autumn of 2008.

But the foundation was already crumbling by then. And indicators started flashing regime change warning lights: The yield curve inverted in February 2006. The stock-bond correlation shifted. Some alert systematic fund managers began rotating out of junk bonds toward quality. Or what they thought was quality, anyway: The ratings agencies were lying through their teeth. Only managers who were able to look through the surface-level ratings from Moody’s and S&P were able to see through the danger.

But credit spreads? They kept tightening, until the bitter end: The ICE BofA High Yield OAS hit a cycle low of 2.41% in June 2007 - seventeen months after the Treasury yield curve first inverted, and months after every other major regime indicator had already fired.

Then the housing market cracked, and credit spreads went from 2.41% to more than 21%, over a period of eighteen months.

Credit Spreads Ahead of the Dot.Com Bust, 1999-2000

We saw a similar pattern in 2000: Spreads stayed narrow through most of 1999 and into early 2000, even as the yield curve (and common sense!) was flashing a warning signal.

The dot.com bust forced the reckoning that caused the credit markets to wake up from their denial.

So we can see from the historical track record that credit spreads can be among the last major market indicators to move. Typically, the credit market tends to act as a confirmation signal, not a true leading indicator of trouble.

It moves, eventually. It has to. But by the time it does, the regime change may well be well underway.

Fast forward to the current situation: High-yield spreads have widened roughly 30–40 basis points from their year-to-date lows. That’s certainly noticeable. But compared to previous crises, it’s a very modest change.

The bulls would point out that, thus far, the credit spread indicator is not signaling a regime change.

The bears would add one word: “Yet.”

Right now, analysts looking at the same data are reaching different conclusions.

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The bulls are advocating a “contained shock” theory: Yes, spreads are widening as the U.S.-Iran conflict continues. But this is a reaction to a specific geo-political event that should soon resolve-not a true economic regime change.

If there is a regime change, it may well be for the better, argue the bulls. The U.S. blockade of the Persian Gulf potentially cuts the knees out from under China, which is highly dependent on Iranian (and until recently, Venezuelan) oil, and provides a more stable supply point for oil in the long term, despite short-term disruptions in the Persian Gulf.

“Even after recent spread widening, valuations in many segments of the high-quality fixed income market remain tight relative to history.” - Lord Abbett, March 4.

Here are some of the more prominent voices making the bullish case:

Russ Brownback, deputy CIO of global fixed income at BlackRock, told CNBC on April 10th that his team expects the Fed to deliver one or two rate cuts by year end “assuming there is no longer open-endedness to the geopolitical conflict.” Which is quite a bold thing to assume!

Matt Wrzesniewsky of Vanguard says that investment-grade corporates had reached “yield levels we haven’t seen since the tariff tantrum in markets last year” - creating a more credible income case for buyers willing to step in.

The bottom line for the bulls: Credit conditions will revert to the mean once the Iran conflict resolves.

The bearish camp is looking past the headline high-yield spread and into the short-term funding markets. And that is where they are starting to sense danger:

On April 7th, Reuters reported that the spread between 30-day A2/P2 commercial paper and top-rated A1/P1 paper had widened to 38 basis points. That’s up from 20 before the war - a level analysts described as consistent with a mild risk-off environment.

In a separate measure, the spread for A2/P2 non-financial issuers over the secured overnight financing rate (SOFR) rose to 44 basis points from 17 before the conflict began.

And AA-rated non-financial commercial paper over one-month SOFR, which stood at zero before the war, has widened to 6 basis points.

“Credit generally has widened across the entire curve and pretty much broadly across industries. The entire curve just got priced higher. So you have to pay a little bit more for funding.” - Jan Nevruzi, US rates strategist, TD Securities, Reuters, April 7.

“We don’t know how liquidity is going to look over the next few weeks.” - Teresa Ho, head of US short-duration strategy, J.P. Morgan, Reuters, April 7.

“Bond vigilantes [are] taking matters into their own hands and tightening credit conditions. Now we can’t rule out a bear market and even a recession. It all depends on how long the strait will be closed.” - Ed Yardeni, CNBC, April 6.

It turns out that both sides have some grounding in the truth: Dr. Harald Henke at Quoniam, published an analysis on March 31 that cuts through the debate. His research found that oil shocks operate through two channels - weakening corporate fundamentals while simultaneously increasing risk premia - and that their credit impact depends heavily on the financial regime in which they arrive. In stable environments, the effects are modest. In environments where financial conditions are already tight, events that markets would ordinarily take in stride may have a very pronounced effect:

“Oil shocks must be analysed in conjunction with financial conditions and policy constraints, as these determine whether the impact remains contained or evolves into a broader credit cycle deterioration.” - Dr. Harald Henke, Principal Investment Strategist, Quoniam, March 31, 2026.

This is important, because financial conditions weren’t exactly “relaxed” when the Iran war broke out: The yield curve had just recently normalized after the longest inversion on record. The term premium was rising, and senior officials were openly discussing reducing the Federal Reserve balance sheet.

The system was already repricing risk in the short-term, as we saw in the VIX futures data. And the oil shock hit mid-transition.

The short-term credit markets are the leading indicator. The high-yield spread is what makes the headlines in the financial press. But the credit pros are carefully watching the “inside baseball” indicators like the commercial paper and bank floating rate note markets.

These are the areas where stress typically shows up before it reaches the front page at the New York Times.

And so these are also the indicators to which systematic funds and their risk models pay closest attention: These markets reflect actual funding conditions for real borrowers in near-real time.

I would focus my attention on three key metrics:

The A2/P2 to A1/P1 spread in 30-day commercial paper. It’s at around 38 basis points as I write this. A sustained move above 50 would signal that money market funds are meaningfully pulling back from lower-quality issuers. This would indicate a tightening liquidity squeeze on lower-tier borrowers.

The ICE BofA High Yield OAS itself. It stood at 2.94% on April 10th. The 2006–07 cycle low was 2.41% - we’re above that already. A sustained move above 4% would put spreads in territory that historically has accompanied deteriorating credit conditions rather than a geopolitical blip.

What Happens if the Iran Conflict is Resolved?

In a pure geopolitical shock scenario a resolution snaps spreads back to normal pretty quickly. But if a structural regime shift is afoot, you’ll see spreads stay elevated because the underlying conditions - tighter financial conditions, higher term premium, weakening credit fundamentals - aren’t going away, regardless of what happens in the Strait of Hormuz.

Systemic investors are rotating toward quality and shorter equity duration. And they are favoring strategies that profit from dispersion between individual companies rather than from broad market direction. See last week’s installment for more on this trend.

The credit spread signal hasn’t fully confirmed a regime shift yet. But as the bears point out in the commercial paper markets, the plumbing is starting to leak.

If the dog isn’t barking yet, it might be starting to growl.

DISCLOSURE: This article is for informational purposes only and does not constitute investment advice. All spread figures cited are sourced from FRED/ICE BofA data and Reuters reporting. Past performance is not indicative of future results.

Until next time,
The Navigator