# Oil prices plunge nearly 20% in May, biggest monthly drop since 2020

**Published:** 2026-05-30T00:03:00.000Z  
**Topic:** Stock Market  
**Sentiment:** bearish  
**Publisher:** TrendWatcher — https://www.trendwatcher.in/article/e9692f7b-a3db-43b3-b062-556105f098f0

Brent crude fell about 19% in May as optimism over a US‑Iran peace deal lifted markets, marking the steepest monthly decline since 2020.

Oil prices slid sharply in May, with Brent crude futures down roughly 19% from the end of April, the steepest monthly fall since 2020 [1]. The decline was driven by growing optimism that the United States and Iran were nearing a cease‑fire agreement that could reopen the Strait of Hormuz [3].

**Key takeaways**  
- Brent crude closed May at about $92 a barrel, a 19% drop since late April [1].  
- The price decline represents the largest monthly slump for oil since 2020 [3].  
- Optimism over a tentative US‑Iran cease‑fire and possible reopening of the Hormuz shipping lane fueled the sell‑off [1][3].  
- Asian equity markets rallied on the news, with Japan’s Nikkei up 2.5% and South Korea’s Kospi up 3.9% [1].  
- U.S. indices showed modest gains, with the S&P 500 up 0.2% and the Dow Jones up 0.6% by late morning [1].

## Market reaction to peace‑deal hopes  

Investors reacted to reports that a draft peace agreement between the United States and Iran was circulating among allies, and that a tentative 60‑day cease‑fire extension was being discussed [1]. Deutsche Bank’s Henry Allen said the market was “showing mounting optimism about an end to the conflict,” which helped push oil prices lower and eased concerns about stagflationary pressures [1]. The optimism was enough to reverse a four‑month rally that had seen crude prices peak near $120 a barrel earlier in the war [3].

The price slide was mirrored in equity markets worldwide. Asian indices surged, with Japan’s Nikkei 225 gaining 2.5% and South Korea’s Kospi rising 3.9% on the day the oil decline was confirmed [1]. In Europe, the FTSE 100 edged up 0.3% and the broader Stoxx Europe 600 rose 0.2% [1]. U.S. markets also posted modest gains, as the S&P 500 rose 0.2% and the Dow Jones increased 0.6% by late morning [1].

## Why it matters  

The near‑20% drop in Brent crude marks the most pronounced monthly decline since the pandemic‑era slump of 2020, underscoring how geopolitical developments can swiftly reshape commodity markets [3]. If a cease‑fire holds and the Strait of Hormuz reopens, oil supply constraints could ease, reinforcing the downward pressure on prices. Conversely, any reversal of the tentative agreement could reignite supply fears and reverse the recent rally in equities. Market participants will be watching diplomatic talks closely, as the trajectory of oil prices will continue to influence inflation expectations and broader asset‑class performance.

## Sources
1. Theguardian — [Oil prices on track for steepest monthly fall since 2020 | The Guardian](https://www.theguardian.com/business/2026/may/29/oil-price-drops-amid-hopes-of-us-iran-peace-deal)
2. Investopedia — [Markets News, May 15, 2025: Stocks Sink, But S&P 500 Rises for 7th Straight Week; Oil Prices Surge; Bond Yields Hit Highest Level in Year](https://www.investopedia.com/stock-market-today-dow-jones-s-and-p-500-05152026-11975522)
3. The Motley Fool — [Oil Prices Tumbled Nearly 20% in May (The Biggest Drop Since 2020).](https://www.fool.com/investing/2026/06/02/oil-prices-tumbled-nearly-20-in-may-the-biggest-dr/)

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Cite as: TrendWatcher, "Oil prices plunge nearly 20% in May, biggest monthly drop since 2020", https://www.trendwatcher.in/article/e9692f7b-a3db-43b3-b062-556105f098f0