Dow hits record high as S&P 500 extends nine‑week winning streak

The Dow Jones Industrial Average closed at a record high on May 22, 2026, while the S&P 500 posted its ninth consecutive week of gains, the longest streak since 2023 [2]. The rally follows a market rebound that began in late March after the United States adopted a more diplomatic tone toward Iran [1].

Key takeaways

• The Dow finished the week up 0.6% and set a new all‑time high [2].
• The S&P 500 logged a nine‑week winning streak, a pattern seen only ten times since 1957 [1].
• Over the eight‑week period ending May 22, the S&P 500 rose 17.3%, its second‑best eight‑week rally in history [1].
• Elevated oil prices from the Iran conflict have pushed CPI inflation to 3.8% in April, raising concerns about future rate hikes [1].
• Analysts note that while the market’s momentum is strong, high valuations and potential Fed tightening remain headwinds [1].

Market momentum and historical context

The week ending May 22 saw the Dow climb 0.6%, the S&P 500 rise 0.4%, and the Nasdaq gain 0.2%, with all three major indexes ending higher [2]. The Dow’s record closing level reflects a broader rally that began after President Trump’s diplomatic outreach in late March, which helped calm investor anxiety following the February U.S. attack on Iran [1]. That easing of tensions coincided with a ceasefire announced in early April, allowing the S&P 500 to add 17.3% over the eight‑week span that ended May 22—the second‑best eight‑week performance on record [1].

Historically, nine‑week winning streaks for the S&P 500 are rare; the index has achieved such a streak only ten times since its inception in 1957 [1]. When a nine‑week streak occurs, the index has on average returned about 10% over the following year, though periods with especially strong eight‑week gains (above 15%) have produced an average 16% gain in the subsequent 12 months [1]. At the close of May 22, the S&P 500 stood at 7,473, suggesting a potential 16% upside to roughly 8,669 by May 2027 if historical patterns hold [1].

Risks on the horizon

Despite the upbeat momentum, the market faces several risks. The Iran conflict has driven oil prices higher, contributing to a CPI increase to 3.8% in April—the highest level since May 2023—and a Federal Reserve Cleveland forecast that inflation could trend toward 6.5% in the second quarter [1]. Such inflationary pressure may compel the Fed to raise interest rates in 2026, a reversal from the rate‑cut expectations held earlier in the year [1]. Historically, each of the four Fed rate‑hike cycles since 1999 has been followed by a three‑month decline in the S&P 500, averaging a 7% drop [1]. Moreover, the index is trading at a forward earnings multiple of 21.2×, above the ten‑year average of 18.9×, indicating relatively rich valuations [1].