Key data: 10-year yield 4.61% to 4.687% · 30-year yield 5.2%, the highest since 2007 · S&P 500 Index down for three consecutive days · Walsh confirmed as the new Fed Chairman · The Big, Beautiful Bill is expected to increase the deficit by $2.8 trillion · 62% of fund managers expect the 30-year yield to hit 6%

Section 1 — What’s Happening Now
In the week of May 15-19, 2026, long-term U.S. Treasury yields soared to their highest levels in years. The 10-year U.S. Treasury yield climbed to 4.61% on May 18, a one-year high, before rising further to 4.687% on May 19. The 30-year U.S. Treasury yield soared to 5.2%, the highest level since 2007.

The S&P 500 fell more than 1% on May 15 and another 0.67% on May 19, closing lower for the third consecutive trading day. The NASDAQ fell 0.90%, and the small-cap Russell 2000 fell 1.33%. Multiple factors are converging simultaneously: inflation data is exceeding expectations, with wholesale prices in April rising 6% year-over-year, the highest upstream inflationary pressure in years; the U.S. debt trajectory continues to deteriorate; a new Fed Chairman has taken over the most complex inflation situation in years; and a large-scale tax cut bill is expected to add trillions of dollars to the national debt over the next decade. The bond market is shouting loudly, and the stock market is finally starting to listen.

Educational Note: U.S. Treasury yields are the interest rates the U.S. government pays to borrow money. When yields rise, it means the government must pay higher interest to attract creditors—either because investors demand higher risk compensation or because bond supply exceeds market demand.

Section 2 — Four Reasons for Rising Yields
Reason 1: Inflation is stubbornly persistent. The April inflation data released on May 15 exceeded market expectations, directly triggering an immediate surge in yields. Wholesale prices in April rose 6% year-over-year, setting a record for the highest upstream inflation in years, indicating that price pressures are not only reflected on the consumer side but are also being transmitted upward throughout the supply chain.

Since September 2024, the Federal Reserve has cumulatively cut interest rates by 175 basis points. Typically, long-term yields should fall accordingly, but the reality is quite the opposite: the 10-year yield has only fallen by about 35 basis points, while the 30-year yield has risen instead, hitting 5.2%. Mark Malek, chief investment officer at Siebert Financial, pointed out that this divergence is “unprecedented.” Current market pricing shows that the probability of a rate hike before December 2026 has risen to 48%, compared to just 14% a week ago.

Reason 2: The new Fed Chairman takes over a crisis. On May 13, 2026, the U.S. Senate confirmed Kevin Walsh as the new Federal Reserve Chairman by a vote of 54 to 45. His term officially began on May 15 when Jerome Powell’s term expired. When Walsh took over, U.S. inflation had exceeded the Fed’s 2% target for more than five years, energy prices remained high due to the U.S.-Iran conflict, and the bond market was calling for a clear return to fiscal discipline. JPMorgan Chase now expects the Fed to maintain interest rates unchanged throughout 2026 and may raise interest rates by 25 basis points as early as the third quarter of 2027.

Reason 3: The U.S. debt problem is愈演愈烈. The U.S. has an annual fiscal deficit of approximately $2 trillion, and interest expenses on existing debt alone are approaching $1 trillion per year. The Treasury Department expects to borrow $189.0 billion in the second quarter of 2026 alone, $79.0 billion more than forecast a few months ago. When market supply exceeds natural demand, the only mechanism that can restore balance is higher yields. The International Monetary Fund has warned that the “safety premium” of government bonds is waning.

Reason 4: The Big, Beautiful Bill and Moody’s downgrade. The Big, Beautiful Bill (OBBB) signed in 2025 permanently extended tax cuts and added new provisions, which are expected to increase the fiscal deficit by $2.8 trillion over the next ten years. On May 16, 2025, Moody’s downgraded the U.S. sovereign credit rating from Aaa to Aa1. A Bank of America survey released on May 19 showed that 62% of global fund managers expect the 30-year Treasury yield to eventually hit 6%.

Educational Note: The yield curve is a graph of the relationship between the yields of government bonds of different maturities. When long-term yields rise much faster than short-term yields, it is called a “bear steepening.” This usually means that investors are concerned about long-term inflation and fiscal sustainability, even if short-term policy rates are relatively stable.

Section 3 — Why Rising Yields Impact the Stock Market
Rising yields put pressure on the stock market through four different channels: the discount effect, the competition effect and equity risk premium, the borrowing cost effect, and the dollar strength and international capital flow effect. When risk-free government bonds offer a 30-year yield as high as 5.2%, stocks must offer a return far higher than this to persuade investors to take on additional risk. Currently, the S&P 500’s earnings yield is about 4.2%, while the 10-year Treasury yield is 4.6%, meaning that investors are getting a lower return from stocks than from risk-free government bonds, and the equity risk premium has been compressed to near zero.

Educational Note: The equity risk premium is the extra return that investors demand for holding stocks relative to the risk-free rate. Currently, the S&P 500’s earnings yield is about 4.2%, while the 10-year Treasury yield is 4.6%, meaning that stocks are technically less attractive than bonds. This state of premium compression has historically been a leading signal of a weakening stock market.

Section 4 — Impact on Different Types of Investors
The environment facing stock investors is more unfavorable for high-valuation growth stocks. Banks, insurance companies, and value cyclical stocks tend to perform relatively better in a rising yield environment. Bond investors should note that short-term bonds currently offer attractive yields of nearly 4% to 4.5% with lower price volatility risk; long-term bonds with maturities of 20 to 30 years have the greatest risk of price declines if yields continue to rise. Income investors are experiencing the most attractive fixed income environment in more than a decade, and the appeal of locking in current yield levels far outweighs any opportunities in 2020 or 2021.

Section 5 — Key Developments to Watch
Focus on Walsh’s first FOMC meeting, U.S. inflation data (CPI and PCE), U.S. Treasury bond auction results, and whether the 30-year yield approaches 6%. Allocation strategies for coping with the current environment suggest that stock investors consider moderately rotating from long-duration growth stocks to value stocks, financial stocks, and industries with solid current earnings; bond investors prefer intermediate-term bonds and high-quality investment-grade credit bonds over long-term government bonds.

The message from the bond market could not be clearer: the era of cheap government borrowing is over. Whether the stock market can smoothly digest this reality, or whether something eventually breaks, will be the core issue facing the market in the second half of 2026.

[BIT]