Global Bond Market Simultaneous Sell-off: Are We at Another Turning Point?

Author: Xiaobing, Shenchao TechFlow

On May 19, during trading hours, the yield on the U.S. 30-year Treasury bond surged to 5.177%, the highest level since August 2007.

The last time a 30-year Treasury coupon was officially issued at 5% was also in August 2007. Two months later, two hedge funds under Bear Stearns collapsed, kicking off the subprime mortgage crisis. This isn't to say history will necessarily rhyme, but when the world's largest, deepest, and so-called "risk-free" market pushes yields back to levels seen on the eve of the financial tsunami, you'd better understand what's really happening.

What's more alarming is that this time, it's not just the United States.

It's Not Just the U.S. Rising; It's a Global Sell-off

If it were only U.S. Treasury yields rising, the story would be simple – market expectations of inflation and Fed rate hikes, nothing more.

But what happened over the past week is of a completely different magnitude.

From May 15 to 18, long-term government bond yields across major developed countries experienced a rare "coordinated surge":

Japan's 30-year government bond yield broke through 4%, hitting an all-time high since the instrument was issued in 1999; the UK's 30-year gilt yield rose to its highest level since March 1998; Germany's 10-year bond yield touched its highest point since May 2011.

If you overlay these charts, a chilling picture emerges: Bond traders in Tokyo, London, Frankfurt, and New York made the same decision in almost the same week: sell.

According to Bloomberg, this was the worst week for U.S. Treasuries since the Trump tariff shock in April 2025, with the 30-year yield approaching the cyclical peak of 2023.

Bond traders are among the most conservative people on the planet. When they start selling in unison, the market senses not just panic, but something structural beginning to give way.

What Triggered the Simultaneous Rout in Global Bond Markets?

Laying all the clues on the table, three main threads emerge:

The first thread is oil.

Since the U.S.-Iran war broke out at the end of February, tensions in the Strait of Hormuz have persisted for nearly three months. In April, the U.S. CPI hit a three-year high year-over-year, and the PPI recorded its largest increase since early 2022, at 6% year-over-year. This isn't a gentle return of inflation; it's a clear secondary shock.

The logic for bondholders is straightforward: if inflation can't be suppressed for the next 5 years, then locking in a fixed 30-year coupon now means losing purchasing power for every extra year I hold. So, either sell or force the issuer to offer a higher coupon as compensation.

That's why this sell-off is concentrated in long-dated bonds – 10-year, 20-year, 30-year. The longer the term, the more sensitive it is to inflation.

The second thread is debt itself.

The U.S. government's fiscal deficit continues to expand, requiring the Treasury to issue more debt. Auctions for 3-year and 10-year notes saw demand fall short of expectations, indicating that as yields keep rising, investors' capacity to absorb the massive supply of U.S. debt is being tested.

Supply is increasing, but demand is shrinking. Foreign central banks, especially the largest buyers of U.S. debt over the past two decades, are reducing their holdings. This is a crucial shift: U.S. Treasuries no longer have a natural buyer.

Japan faces a similar situation. There are market concerns that the Japanese government might need to introduce an extra budget to cope with economic pressures, worsening deficit expectations. The UK's troubles are more direct. Prime Minister Starmer's political crisis has further shaken market confidence in UK fiscal discipline, pushing the 30-year gilt yield to a 28-year high.

The third thread is the central banks' "credibility issue."

This is the most subtle layer.

At its latest meeting, the Federal Reserve held rates in the 3.5%-3.75% range. Surprisingly, there was internal dissent, with three of the 12 voting members publicly opposing the dovish lean in the statement. This hawkish dissent was interpreted by the market as a warning to the incoming new Chair, Kevin Warsh: don't expect to cut rates easily.

The interest rate futures market has already pushed the probability of a December rate hike to 44%, a stark contrast to the market's general expectation of at least two rate cuts at the start of the year.

A complete 180-degree reversal in expectations, occurring in less than 5 months.

What Does 5% Really Mean?

Many people don't have a strong feeling about "U.S. Treasury yields." What does it have to do with your life, your assets, or that bit of Bitcoin you have in your account?

Let's use an analogy.

The 30-year U.S. Treasury yield can be understood as the "water level" for global asset pricing. It represents the closest thing to a "risk-free" long-term return on the planet. The fair valuation of all other assets – stocks, real estate, gold, Bitcoin, private equity – is essentially built by adding a risk premium on top of this water line.

When the water line rises, everything must be re-evaluated.

Here's a concrete example: You hold a tech growth stock. The market was willing to give it a 30x price-to-earnings (P/E) ratio, based on the belief in its future cash flows over the next decade. But now, a 30-year Treasury bond can offer you a 5% "risk-free" return. The same money locked in bonds for 30 years will more than double the principal. Why take the risk of paying a 30x valuation for an uncertain tech company?

Consequently, valuations will contract.

Mortgages are similar. The 30-year fixed mortgage rate in the U.S. essentially follows the 10-year Treasury yield. A 10-year yield breaking above 4.6% means new mortgage applicants could face rates above 7%. That's why if the 30-year yield continues to climb above 5%, the pressure won't be limited to the bond market. It will spill over into real estate, small-cap stocks, high-valuation growth stocks, and any other sector dependent on long-term funds remaining cheap.

As for gold and Bitcoin, their common characteristic is that they generate no cash flow.

In a zero-interest-rate era, this wasn't a problem because your alternative was a bond yielding 0.5%. But now that the alternative has become a bond yielding 5%, the situation is entirely different.

Over the past three weeks, Bitcoin's performance has perfectly illustrated the concept of a "macro alternative asset."

In the week the 10-year Treasury yield broke above 4.5% and the 30-year approached 5.1%, U.S. spot Bitcoin ETFs saw net outflows of approximately $700 million.

Bitcoin's price fell from above $82,000 to below $80,000. On May 19, the same day the 30-year yield surged to 5.18%, Bitcoin came under pressure alongside altcoins and other risk assets.

The logic chain is simple:

Institutional investors face a very specific arithmetic problem: Put $1 million into a 30-year U.S. Treasury, get $50,000 annually for the next 30 years, with principal returned at maturity, almost zero risk. Put the same money into Bitcoin, betting it can outperform that 5% compound interest.

The insidious nature of compound interest means that 5% over 30 years multiplies your money by 4.3 times. This means Bitcoin must outperform 4.3 times over 30 years just to "break even" on this opportunity cost. Sounds easy? But only if you can withstand any interim drawdown of over 50%.

This is exactly why the capital rotation logic – "every dollar in Bitcoin is a dollar not earning that 5% return" – will continue to put pressure on non-yielding assets.

What Truly Deserves Caution is Something Else

Let's return to the specific number, 5.18%.

Many analyses interpret this as "short-term tightening pressure." I disagree.

If you zoom out and look at the bigger picture, the dominant macro backdrop for global asset prices over the past 40 years has been the long-term decline in interest rates. The U.S. 10-year Treasury yield was 15% in 1981 and fell to 0.5% in 2020. For 40 whole years, the water line was steadily dropping. All "value investing logic," all "60/40 portfolios," all "tech stock valuation models," and even the narrative of Bitcoin as "digital gold," were built upon this long-term trend.

The question now is whether this 40-year downward trend might have already ended in 2020.

What we might be witnessing is the early stage of the water line beginning to rise in reverse.

"The market is starting to price in the likelihood that the Fed will have to work harder to suppress inflation," said Ed Al-Hussainy, portfolio manager at Columbia Asset Management. He believes this sell-off reflects not only a worrying inflation path but also an accelerating economy.

If his assessment is correct, then 5.18% is not an endpoint, but the starting point of a new range.

The deeper issue is debt.

U.S. federal debt is approaching $37 trillion. For every 1 percentage point rise in interest rates, the U.S. Treasury must pay several hundred billion dollars more in interest annually. When interest payments exceed the defense budget and healthcare spending, eventually eating into everything else, the market will force the government either to slash spending drastically or to monetize the debt.

Historically, every large debt cycle has ended in one of these two ways.

U.S. Treasuries are called a "ballast stone" because they are the foundational collateral for the global financial system. Bank capital adequacy ratios, insurance company solvency, pension fund duration matching, hedge fund repo financing, and central bank foreign exchange reserves – all these chains ultimately rest on U.S. Treasuries as their core foundation.

When the ballast stone's price fluctuates violently, the whole ship rocks.

The downfall of Silicon Valley Bank in 2023 was triggered by unrealized losses on its Treasury holdings. If long-term yields above 5% become the new normal, who will be the next to surface with problems?

There is no standard answer to this question. But as an investor, you should at least ask one more question when looking at your asset allocation:

Does the valuation model for my assets still assume a zero-interest-rate environment?

If so, please recalculate.

The water line has already changed.