Unusual Bond Market Turns Traditional Risk Assumptions Upside Down
Global bond markets are going through an unusual period in which some of the securities traditionally considered safer are experiencing greater price volatility than riskier forms of bank debt.
One of the clearest examples is the market for Additional Tier 1, or AT1, bonds. These instruments are generally considered among the riskiest types of bank debt because they can absorb losses during periods of severe financial stress. Yet as government bonds and other long-dated securities face pressure from rising yields and concerns over inflation, borrowing and heavy debt issuance, AT1 bonds have shown surprising stability.
The situation reflects an increasingly unusual bond-market environment. Investors are demanding greater compensation for holding longer-term government and high-quality debt, while some riskier credit instruments continue to benefit from strong investor demand and relatively healthy financial conditions. Recent market moves have also highlighted pressure on long-term government bonds as investors question whether official measures can fully stabilize rising yields.
What Makes AT1 Bonds So Risky?
AT1 bonds, often referred to as contingent convertible bonds or CoCos, are issued by banks as part of their regulatory capital.
Unlike conventional bonds, they are specifically designed to absorb losses if a bank’s financial condition deteriorates significantly. Depending on the terms of the security and regulatory framework, investors can face outcomes including the conversion of their holdings into shares or a reduction in the value of their investment.
Many AT1 securities are also perpetual, meaning they do not have a traditional fixed maturity date. Coupon payments can be subject to restrictions, and investors generally rank below many other creditors if a bank gets into serious trouble.
That combination normally makes AT1 debt significantly riskier than senior bank bonds or government securities. Index methodologies for the sector classify these instruments as contingent convertible capital securities issued by banks, often including callable and perpetual structures.
Yet despite those risks, AT1 bonds have recently been showing greater stability than parts of the supposedly safer bond market.
Government Bonds Face Growing Pressure
The biggest reason for this unusual situation is the pressure building in government debt markets.
Long-term bond yields have been rising as investors consider the effects of persistent inflation, large government borrowing requirements and increased debt issuance. Higher yields mean lower bond prices, creating losses for investors holding longer-duration securities.
The pressure has been particularly visible in the US Treasury market. On August 20, the yield on the 30-year US government bond climbed above 5.22%, while the benchmark 10-year yield also moved higher after an earlier decline. The moves came as investors continued to assess whether Treasury buybacks would be enough to calm the market.
This creates an uncomfortable situation for investors who traditionally rely on government bonds for stability.
When interest-rate and fiscal concerns dominate the market, even highly rated government debt can experience significant price swings.
AT1 Bonds Benefit From Strong Bank Fundamentals
AT1 bonds, meanwhile, are benefiting from a different set of conditions.
The banking sector has generally entered this period with stronger capital positions than during previous financial crises. Higher regulatory capital requirements and years of post-crisis reforms have provided banks with larger financial buffers.
For investors, this reduces immediate concerns about the extreme scenarios that could trigger losses on AT1 securities.
A recent example came from Banco Santander, which issued $1.5 billion of AT1 securities in 2026 with a 7.25% annual remuneration for the initial period. The conversion trigger was linked to the bank’s common equity tier 1 ratio falling below 5.125%, compared with a reported 14.4% ratio at the end of March.
Such examples illustrate why investors may currently feel more comfortable accepting AT1 risk: the higher yields offered by these instruments are being supported by banks with substantial capital cushions.
Higher Income Makes AT1 Debt Attractive
The income available from AT1 bonds is another important factor.
Because investors are taking on greater risks, these securities generally offer higher yields than senior bank debt and government bonds. That additional income can help offset price volatility and make the bonds particularly attractive when investors are searching for returns.
The complexity of AT1 securities can also create what some investors describe as a complexity premium, meaning buyers receive additional yield for holding instruments that carry unusual structures and risks.
However, that higher income comes with important trade-offs. Industry disclosures warn that AT1 and other contingent convertible securities can expose investors to coupon cancellation, conversion or significant losses if a bank experiences severe financial stress.
For now, though, investors appear willing to accept those risks because the current financial environment has not produced widespread concerns about the health of major banks.
The Bond Market Is Sending Conflicting Signals
The difference between AT1 stability and government-bond volatility highlights a broader contradiction across financial markets.
Normally, investors move away from risky debt and toward government securities when uncertainty increases. This time, however, some of the uncertainty is centered on government borrowing itself.
Concerns about inflation, fiscal spending and the growing supply of government and corporate bonds have contributed to rising yields. At the same time, high-yield credit markets have remained relatively resilient, suggesting that investors are not yet pricing in a major deterioration in corporate or banking conditions.
That has created what can appear to be an upside-down market: debt with lower credit risk is vulnerable to interest-rate pressure, while securities carrying higher credit risk remain supported by investor demand.
Long-Duration Bonds Are Particularly Vulnerable
The difference largely comes down to duration risk.
A bond with a long maturity is more sensitive to changes in interest rates. When yields rise, the prices of long-dated bonds generally fall more sharply than those of shorter-duration securities.
AT1 bonds are not risk-free from interest-rate movements, but their high coupon payments and credit spreads can make their performance behave differently from that of traditional long-term government bonds.
This means that an investor’s biggest risk may not always come from the possibility of a default.
In the current environment, a holder of a long-term government bond can face significant mark-to-market losses simply because interest rates rise, even if the government remains fully capable of making its payments.
AT1 investors, by contrast, are taking on more severe credit-related risks but may currently be experiencing less day-to-day volatility.
Investors Are Chasing Income and Stability
The continued demand for AT1 securities also reflects the broader search for income.
Traditional government bonds remain important for institutional investors, pension funds and central banks, but rising supply and changing inflation expectations have made the market more difficult to navigate.
Riskier bank debt can offer investors a way to generate higher returns without moving completely into equities or lower-rated corporate bonds.
This does not mean AT1 debt has suddenly become safe.
The instruments remain vulnerable to sudden changes in bank conditions, regulatory decisions and financial crises. Their structure can also create risks that may not be fully understood by every investor.
The collapse of Credit Suisse AT1 bonds in 2023 remains a reminder that these securities can suffer extreme losses under extraordinary circumstances. The current stability therefore depends heavily on continued confidence in bank capital levels and the broader financial system.
A Stable Market Can Change Quickly
One of the biggest risks for AT1 investors is that stability can disappear rapidly.
AT1 bonds are designed specifically for moments when a bank is under severe stress. As long as bank capital levels remain strong, investors can benefit from attractive yields. But if a major financial shock weakens confidence in the banking sector, the same instruments could experience sharp price declines.
This creates a significant contrast with government bonds.
Government debt may currently be suffering from interest-rate volatility, but high-quality sovereign securities still offer a different type of protection during a severe financial crisis. AT1 bonds cannot provide the same level of safety because their purpose is to absorb losses when banks are in trouble.
The current market therefore does not represent a permanent reversal of the relationship between risk and stability.
Instead, it reflects the specific economic conditions investors are facing today.
The Role of Inflation and Government Borrowing
The future performance of both markets will depend heavily on inflation and fiscal policy.
If inflation remains persistent, central banks may need to maintain higher interest rates for longer. That could continue putting pressure on long-term government bonds.
At the same time, governments around the world are expected to continue issuing significant amounts of debt to finance spending and refinance existing obligations. A growing supply of bonds can require higher yields to attract sufficient buyers.
Corporate borrowing is also adding to the pressure. Major technology companies are increasingly raising money to fund artificial intelligence infrastructure, contributing to a larger supply of debt across financial markets.
These forces could keep the traditional bond market under pressure even while riskier credit sectors remain relatively stable.
Looking Ahead
The surprising resilience of AT1 debt shows how unusual today’s bond market has become.
Securities designed to absorb bank losses are currently experiencing stability that contrasts sharply with the volatility affecting supposedly safer long-term government bonds. Rising yields, inflation concerns and heavy borrowing requirements have shifted attention away from traditional credit risk and toward interest-rate and fiscal risk.
However, investors should not interpret this stability as proof that AT1 bonds are safer than government debt.
AT1 securities remain complex instruments that can expose investors to coupon cancellations, conversion and significant losses during periods of banking stress. Their current resilience is largely a reflection of strong bank capital positions, attractive yields and continued investor appetite for income.
The situation instead demonstrates an important lesson for financial markets: risk is not static. Government bonds can become volatile when inflation and borrowing concerns rise, while riskier securities can remain stable when the underlying institutions issuing them are financially strong.
For now, AT1 debt is benefiting from that unusual balance. But if the banking environment changes, the upside-down bond market could quickly return to a more familiar order.
