Last night (Monday, September 14), the yield on the ten-year U.S. Treasury bond surged to 5.014% at one point, marking the first time it has reached this integer level since 2023; although it closed back around 4.947%, the pattern of holding below 5% for nearly three years since October 2023 has been broken for the first time. Looking back through history, each instance of the ten-year Treasury falling below 5% has led to a polarizing "dormant period": either a short rebound of 5 to 10 months (about 110—220 trading days) or a prolonged drop lasting over 1,000 trading days. The former represents routine fluctuations in rates, while the latter signifies the formation of a low-interest rate environment. Last night's event is a breakthrough after more than seven hundred trading days of dormancy below 5%—measuring not the extent of rate fluctuations, but a paradigm shift in the market's overall perception of the central interest rate. So what was the performance of the U.S. stock market during similar historical moments?

1. What happened in the market last night

The key feature of this breakthrough is that long-term bonds are rising faster than short-term ones. Last night, the yield on the 30-year bond hit 5.38% intraday, closing at 5.328%; the two-year yield slightly retreated to 4.628%. This is a typical "bear steepening" pattern, indicating that the market is pricing not just short-term policy rates but also longer-term inflation and supply risks. At the beginning of the year, the ten-year Treasury yield was only 4.15%, with an upward accumulation of about 85 basis points within the year.

The catalyst is a combination of several clues. On the energy front, a shutdown of Saudi Arabia's east-west oil pipeline due to an attack threatens about 4% of global crude supply; on the inflation front, the core inflation in August remained high at 3.4%, far from the Fed's 2% target; on the policy front, the European Central Bank raised interest rates last week, and the Bank of Japan is expected to follow suit this Friday, while the Fed's interest rate decision is imminent on September 16, with CME FedWatch showing a more than 90% probability of a rate hike, with the current federal funds target range at 3.50%–3.75%. Notably, the Treasury has doubled the scale of bond repurchases from $3 billion to $6 billion, yet this has not been able to suppress yields—indicating that selling pressure comes from fundamental pricing, not liquidity.

2. Historical Reappearance: Breakthrough of 5% after Long Dormancy, How Many Times Has It Occurred?

Around the time of the internet bubble (late 2001 to early 2002) and just before the subprime mortgage crisis (mid-2007), the ten-year Treasury had also briefly returned to 5%, but those instances only lingered below 5% for 1 to 10 months, not qualifying as a "long dormancy." The only comparable instances in history to last night are four.

3. Review: How the S&P 500 Performed After the Previous Long Dormancy Breaks of 5%

Sample One: July 1966—Essentially Flat Six Months Later

This was the first time in modern history that the ten-year Treasury yield surpassed 5%. The average yield rose to 5.02% in July 1966 and further to 5.22% in August, the last occurrence being traced back to the 1920s. It should be noted that the S&P 500 had already peaked at 94.06 on February 9 of that year and had retreated about 9% by the time of the July breakthrough—indicating that the impact of rising rates had been previously priced in. Following the breakthrough, the market fell for about two and a half months, bottoming at 73.20 on October 7, marking a cumulative drop of 22.18% from the February peak, constituting the smallest bear market since 1950, termed the "Baby Bear." However, the rebound after the bottom was swift: by November, it recovered to 80.99, returned to 84.45 by January 1967, and had fully regained the February peak by May 4, taking only 7 months from the bottom to recovery. From the breakthrough point in July, the S&P 500 returned to 84.45 from 85.84 after six months, only slightly down 1.6%, essentially flat.

Sample Two: April 2006—Moderate Increase

The rise in the ten-year Treasury yield in 2006 occurred against a backdrop of an overheating economy. The average yield rose to 4.99% in April 2006 and to 5.11% in May, surpassing 5% for the first time since 2002, topping out around 5.25% in June. The S&P 500 rose from 1,302.17 in April to 1,363.38 in October, a 4.7% increase over six months; if calculated from May, it went from 1,290.01 to 1,388.64 in November, registering a 7.6% rise. The process also had its challenges. From May to mid-June 2006, the S&P experienced a rapid pullback of about 7-8%, and then regained momentum as yields peaked and fell, reaching historic highs in the fall.

Sample Three: October 2023—Significant Rise

The market sentiment during the last breakthrough is the closest to today. From October 19 to 23, 2023, the yield on the ten-year Treasury broke 5%, with an intraday high of 5.02%, the highest since July 2007. At that time, market sentiment was extremely pessimistic, and the S&P 500 continued to decline after the breakthrough, reaching a bottom of 4,117 points on October 27, falling about 4% from October 19. However, this downturn laid the groundwork for the subsequent rebound. The S&P 500 launched a strong upward attack from 4,258.98 in October 2023 to 5,095.46 in April 2024, achieving a remarkable 19.6% gain over six months.

4. Historical Lessons: What Common Effects Does Rising U.S. Treasury Yield Have on U.S. Stocks?

When viewed together, the results six months later were -1.6%, +4.7%, and +19.6% respectively. The worst case resulted in merely returning to the starting point, with no instance showing a sustained deep decline. However, what is more valuable is not this range, but the differences behind it.

The interest rate level itself does not determine the direction of the stock market: All three instances involved the same "breaking 5%" action, yet the outcomes differed by 20 percentage points. What truly distinguishes strength from weakness is the "story" behind the rising yields: in 2006 and 2023, rising yields accompanied nominal growth and profit expansion, which the stock market can digest as "good rates up"; in 1966, rising yields were associated with credit contraction and falling profits, making it a "bad rates up" scenario that the stock market could not digest, resulting in it merely "holding steady" rather than rising. In other words, interest rate hikes are not inherently bearish; it is the disruption of growth by rate hikes that is problematic.

The market often prices in advance: The decline in 1966 occurred before the breakthrough, while the bottom in 2023 appeared on the sixth trading day after the breakthrough. By the time the integer level is widely reported by the media, the most panicked stage has usually already passed.

The U.S. stock market overall stabilizes six months after the breakthrough but will also experience initial downturns: In the first few weeks to over two months following the three breakthroughs, the stock market mostly experienced a pullback—approximately -15% in 1966 to the bottom, around -8% from May to June 2006, and about -4% in October 2023. The real turning points almost always occurred after yields peaked and fell, not on the day of the breakthrough.

5. What Is Different This Time? Three Key Variables to Monitor

First, is inflation a one-time supply-driven shock? The immediate trigger for this round of upward movement has been the Middle East situation and oil prices, with Brent surpassing $109. If geopolitical tensions ease and oil prices fall, this would align more closely with the 2023 narrative; if energy prices remain high and transmit to core inflation, it would shift towards a 1966 scenario.

Second, will central banks sacrifice growth for inflation? The biggest difference this time is that major global central banks are tightening synchronously—like the Fed, ECB, and BOJ nearly simultaneously transitioning, unlike the unilateral tightening expectations of 2023. Synchronous tightening has a stronger impact on global liquidity withdrawal, which is characteristic of the 1966 narrative.

Third, are corporate earnings still expanding? This is the most explanatory variable across all samples. As long as the upward earnings trend is not interrupted, high interest rates tend to lead to valuation compression rather than trend reversals.

Disclaimer: The content of this article is intended for investor education and market information reference only, and does not constitute any investment advice or recommendations for specific securities or financial products. The historical statistical comparable sample size mentioned is limited (only 3 cases), past performance does not guarantee future returns, and does not possess inevitable repeatability. There are risks in the market, and investments should be made cautiously; investors should independently assess their own risk tolerance and bear risks themselves.

Data Source: Public market reports (Bloomberg, Yahoo Finance, UPI, Semafor, etc.); historical sequences from Robert Shiller's database (S&P 500 monthly prices, ten-year Treasury monthly yields); trading day counts were calculated after excluding weekends and U.S. market holidays.

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