5.33%! U.S. Treasury yields hit a 19-year high, as an "invisible tightening" without rate hikes crushes global equities

On August 18, the yield on the 30-year US Treasury touched5.33%，its highest level since 2007; the 10-year yield rose to4.72%, the 2-year yield curve report4.17%. The yield curve is displaying a typical"bear steepener" pattern,，with short-end rates remaining relatively stable while long-end rates continue to surge.This implies that financial conditions are tightening passively, even if the Federal Reserve holds steady. Meanwhile, long-term bond yields in Japan, Germany, and France have simultaneously hit multi-decade highs, signaling a repricing of global long-term capital costs.

Let us first examine the four major drivers behind this outcome.

First, fiscal deficits are spiraling out of control.The total size of US Treasury debt is approaching $40 trillion, with fiscal deficits sustained at 5%–6% of GDP. Recent auctions of 10-year and 30-year US Treasuries saw winning yields hit 19-year and 25-year peaks, respectively, leading the market to increasingly view the US as facing structural financing challenges rather than short-term gaps.

Second, the AI-driven bond issuance boom is exacerbating supply pressures.Tech giants such as Amazon, Alphabet, Meta, and Oracle have issued approximately $194 billion in bonds this year, a 79% increase compared to the full year of 2025. With both government and corporate financing competing for long-term capital, bond market supply is expanding rapidly.

Third, major creditor nations are reducing their holdings.In June, Japan reduced its holdings by $26.4 billion, China by $26 billion, and the UK by $8.7 billion. This synchronized exit by the three largest creditors has further weakened demand-side support.

Fourth, geopolitical risks are driving up inflation expectations.The breakdown of US-Iran negotiations has led to shipping volumes in the Strait of Hormuz dropping to just 5% of pre-war levels. With oil prices rising continuously, inflation uncertainty has resurfaced, putting pressure on long-end bonds.

Does the sustained rise in US Treasury yields impact the US stock market?

Absolutely, and the impact is significant.

The risk-free rate serves as the benchmark discount rate for equity valuation. A surge in long-end yields directly raises the discount rate,causing a substantial shrinkage in the present value of future cash flows.This hits long-duration, high-valuation growth and tech stocks the hardest.

We can look at the closing performance on August 18. $Nasdaq Composite Index (.IXIC.US)$ The Nasdaq Composite fell 1.33%, $PHLX Semiconductor Index (.SOX.US)$ the Philadelphia Semiconductor Index dropped 4.98%, $Micron Technology (MU.US)$ Micron Technology declined 7.06%, $SanDisk (SNDK.US)$ SanDisk fell 8.89%, $Western Digital (WDC.US)$ and Western Digital dropped 7.43%.

In response to the sustained rise in US Treasury yields, I believe we need to take the following measures:

1. Avoid chasing high-valuation growth stocks at elevated levels. This round of rising interest rates is driven by fiscal supply and geopolitical risks rather than robust economic growth, which directly suppresses valuations. The correction in tech stocks may not be over until long-term yields decline significantly.

2. Be wary of the惯性 thinking that 'rate cuts are inherently bullish'. The Federal Reserve has previously cut rates by a cumulative 175 basis points, yet long-term yields have continued to rise, indicating that the traditional transmission mechanism has broken down.

3. Tilt towards assets with strong cash flow certainty. Capital is rotating from growth sectors with a high proportion of long-term earnings into high-dividend stocks, consumer staples, and defensive sectors.

4. Keep dry powder ready. If the Bank of Japan exits its yield curve control policy, Japanese investors may sell off massive amounts of US Treasuries to repatriate funds. This could trigger sharper corrections in global assets, potentially creating a medium-to-long-term 'golden buying opportunity'.

5. Watch three key verification points: Whether long-term bond yields remain sustainably above 5%, the tone of the Federal Reserve's meeting minutes, and whether the US-Iran conflict escalates further.

Disclaimer:The above content is based on public data and quantitative analysis and is for reference only; it does not constitute investment advice. The market involves risks, so invest with caution. Any investment decision should be made independently based on personal risk tolerance, financial status, and investment objectives, consulting licensed professional institutions when necessary. Past performance does not indicate future returns.

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