NEW YORK — A strange imbalance is taking shape in the U.S. corporate bond market: investors are aggressively chasing the longest-dated debt, while companies are increasingly reluctant to issue it.
The result is a market where some of the bonds investors want most are becoming increasingly difficult to find.
Long-term corporate bonds have become particularly scarce as borrowing costs rise. Companies are hesitating to lock themselves into decades of relatively expensive financing, even as pension funds, insurers and other long-duration investors continue looking for assets that can match their long-term liabilities.
The tension has become visible in some of the biggest recent bond deals.
Aon’s 30-Year Bond Draws More Than $14 Billion in Orders
One of the clearest examples came from insurance broker Aon.
Aon priced $2 billion of notes maturing in 2056 as part of a roughly $13.5 billion, seven-part bond offering designed to help finance its acquisition of USI Insurance Services.
Investors submitted more than $14 billion of orders for the 30-year tranche alone, making it the most heavily sought-after portion of the transaction, according to people familiar with the deal cited by Bloomberg.
Aon ultimately raised $13.5 billion across maturities ranging from three to 30 years. Separate reporting said total investor orders across the offering reached as much as $65 billion.
The demand is significant because investors are effectively competing for limited access to long-duration corporate credit.
Aon’s longest-dated notes also subsequently outperformed the shorter-dated portions of the deal in secondary trading, according to Bloomberg’s reporting based on Trade Reporting and Compliance Engine, or TRACE, data.
GSK Shows Just How Hungry Investors Are
A similar pattern emerged in a recent bond sale by pharmaceutical company GSK.
The company’s $500 million 30-year tranche reportedly attracted orders equivalent to about 15 times the amount being offered.
That means investors sought roughly $7.5 billion of the securities, illustrating how intense demand can become when a high-quality issuer offers scarce long-duration debt.
The unusual demand isn’t necessarily because investors believe rates will fall immediately.
For many large institutional investors, long-term bonds serve a structural purpose.
Pension funds and insurance companies have liabilities that can extend for decades. Long-maturity corporate bonds can therefore help them match the duration of the assets they own with the obligations they must eventually pay.
When fewer companies issue 20- or 30-year debt, those institutions have fewer securities available to meet that need.
Companies Have the Opposite Problem
For corporate treasurers, however, the calculation is different.
Issuing a 30-year bond means locking in today’s borrowing cost for decades.
That has become considerably more expensive as long-term Treasury yields have climbed.
The benchmark U.S. 30-year Treasury yield reached 5.36% on September 15 and 5.35% on September 16, before easing to 5.29% on September 17, according to Federal Reserve data compiled by the Federal Reserve Bank of St. Louis.
The 30-year Treasury yield had also moved above 5.35% during the recent selloff, reaching levels not seen since 2007, according to market reports.
Corporate borrowers have to pay a premium over Treasuries to compensate investors for taking credit risk.
That makes the economics of issuing extremely long-term debt considerably more difficult when government bond yields are already elevated.
As RBC Global Asset Management portfolio manager Neil Sun told Bloomberg, elevated yields are making it increasingly difficult for corporate treasurers and chief financial officers to justify long-dated funding.
Long-Term Bond Supply Is Shrinking
The shift is already showing up in issuance data.
Investment-grade bond sales during the first half of September were running at less than half the level of the same period a year earlier, according to Bloomberg data cited in the report.
More strikingly, long-dated securities accounted for only about 5% of investment-grade issuance during the first half of September, the lowest share for that period since at least 2020.
At the same time, bonds with maturities between three and 10 years represented about 60% of issuance, up from 51% a year earlier.
In other words, companies are increasingly favoring shorter maturities while investors are searching for longer ones.
That creates a supply-demand mismatch at the long end of the corporate credit market.
Why Companies Are Choosing Shorter Debt
The reason is largely about interest-rate expectations.
If corporate executives believe borrowing costs could eventually decline, issuing a 30-year bond today at elevated rates can look unnecessarily expensive.
A company may instead choose a shorter maturity, refinance later and potentially take advantage of lower rates if monetary conditions improve.
But that strategy carries its own risk.
If rates remain high or rise further, companies that repeatedly refinance shorter-term debt could eventually face even higher borrowing costs.
This leaves corporate treasurers balancing two opposing risks: locking in today’s expensive long-term rates or accepting refinancing risk by borrowing for shorter periods.
The Federal Reserve Is Still a Major Piece of the Puzzle
The bond market’s unusual behavior is unfolding against a broader rise in long-term yields.
Reuters recently reported that the U.S. bond selloff had pushed the 10-year Treasury yield to around 5%, a level the market has not sustained for long in nearly two decades. The report pointed to inflation concerns, government borrowing needs and the broader economic backdrop as important factors behind the rise in yields.
Reuters also reported that investors were increasingly focused on the possibility that long-term rates could remain elevated because of inflation uncertainty and the large amount of U.S. government debt being issued.
That matters to corporate borrowers because Treasury yields provide the foundation for pricing much of the corporate bond market.
When the Treasury curve rises, companies generally have to pay more to borrow.
AI Companies Face an Especially Important Test
The shortage of attractive long-term corporate debt could become even more consequential as technology companies spend enormous amounts on artificial intelligence infrastructure.
Companies such as Alphabet and Amazon have already been active users of long-term debt to help finance large-scale investments.
Higher long-term rates make that financing more expensive.
The issue is particularly relevant because the AI investment cycle requires enormous amounts of capital for data centers, computing infrastructure, power and networking.
WisdomTree noted recently that U.S. dollar investment-grade issuance had already surpassed $1.5 trillion in 2026, with technology companies accounting for a large portion of jumbo transactions.
That creates an unusual contradiction.
The companies with some of the biggest capital requirements may want access to enormous amounts of debt, while the rising cost of long-term financing could make them more cautious about issuing it.
Asia Is Feeling the Same Long-Dated Supply Squeeze
The phenomenon isn’t confined to the United States.
Bloomberg data cited in the original report showed that during the first half of September, Asia-Pacific companies issued only one dollar-denominated bond with a maturity of more than 10 years and no call provision.
That was a $500 million issue from Norinchukin Bank.
The volume of long-term dollar corporate bonds issued in the region during the first half of September was reportedly the lowest for that period in roughly 15 years. By comparison, companies in the region issued approximately $6.7 billion of comparable debt during the same period a year earlier.
Asian borrowers, like their U.S. counterparts, have generally been favoring five-year, seven-year and shorter maturities.
A Market Where Scarcity Is Becoming the Story
The unusual situation highlights an important feature of today’s credit market.
Normally, investors worry about too much corporate debt flooding the market.
Now, at least at the long end, the problem is moving in the opposite direction.
There is strong demand for high-quality long-duration corporate bonds, but companies are unwilling to supply as much of them because borrowing costs have risen sharply.
That scarcity can give issuers who do come to market significant pricing power.
Aon and GSK demonstrate what can happen when a highly rated corporate borrower offers investors something increasingly difficult to obtain: long-term credit from a recognizable issuer.
But Strong Demand Does Not Mean the Bonds Are Risk-Free
There is another important part of the story.
Investors may be willing to accept lower credit premiums because high-quality corporate bonds remain attractive compared with other assets, but that does not eliminate interest-rate or credit risk.
Investment-grade corporate spreads over Treasuries have become historically tight.
Schwab, citing Bloomberg data, noted that the spread between investment-grade corporate bonds and Treasuries had compressed to levels comparable with the late 1990s.
A narrow spread means investors receive relatively little additional compensation over government debt for taking corporate credit risk.
So while the headline yield on a corporate bond may look attractive, the incremental compensation for credit risk can be much smaller.
That distinction becomes important if economic growth weakens or corporate defaults begin to rise.
The Bigger Question: What Happens If Rates Stay High?
The bond market’s current imbalance ultimately depends on what happens to long-term interest rates.
If yields fall substantially, companies that have postponed long-term borrowing could return to the market, potentially releasing a wave of pent-up supply.
If yields remain elevated, however, corporate treasurers may continue favoring shorter maturities while investors compete for the limited long-dated bonds that are actually issued.
For pension funds and insurers, that could make long-duration corporate credit increasingly difficult to source.
For companies, it could mean a difficult financing choice: pay today’s high rates for decades or take the risk that refinancing will become even more expensive later.
And for the broader credit market, the unusual gap between what investors want to buy and what companies want to sell could become one of the defining stories of the bond market as 2026 moves toward its final quarter.
