Stock Market Today, March 23: Stocks Rally on Iran De-escalation Signals

By Emma Newbery – Mar 23, 2026 at 5:12PM ESTThe S&P 500 (^GSPC +1.15%) rose 1.15% to 6,581.00 and the Nasdaq Composite (^IXIC +1.38%) climbed 1.38% to 21,946.76.

The Dow Jones Industrial Average (^DJI +1.38%) gained 1.38% to 46,208.47 as oil prices plunged following Iran conflict de‑escalation signals..Market moversIndustrials, financials, and travel companies erased some of their recent losses as oil prices fell.

Norwegian Cruise Line (NCLH +6.31%) soared 6.17% to finish at $20.12. American Airlines (AAL +3.64%) and Delta Air Lines (DAL +2.76%) also posted gains.

Fair Isaac Corporation (FICO 5.77%) slid more than 5%. This could have been due to increased competition or news of a politician’s call for a pricing probe. AI bellwether, Nvidia (NVDA +1.80%), gained on broader sector strength.What this means for investorsToday saw another volatile, headline-driven day of trading as investors weighed signs of de-escalation in the Iran war. Brent crude fell about 11% to finish below $100 a barrel, powering indexes higher. The conflict is now in its fourth week, and President Trump’s comments this morning fueled cautious hope that a prolonged conflict could be avoided. The bounce comes amid growing concerns about rising costs. The full impact of the spike in energy prices has yet to be seen. However, inflation may well increase, dashing investor hopes for multiple rate cuts from the Federal Reserve this year. For investors, the recent volatility highlights the importance of diversification. Portfolios with exposure to a mix of industries, including defensive sectors, tend to fare better during market downturns.Read NextMar 23, 2026 •By Jeremy BowmanMarkets Are Swinging on Every Iran Headline.

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Your Investment Plan Shouldn't Be.Mar 22, 2026 •By Katie BrockmanMarkets Are Down 5% in 2026: What Long-Term Investors Should RememberAbout the AuthorEmma Newberry is a contributing Motley Fool cryptocurrency analyst covering digital currencies and blockchain trends. She previously wrote for Motley Fool Money (formerly The Ascent) on personal finance, investing, retirement readiness, and crypto. Earlier in her career, Emma founded an English-language newspaper in Colombia and contributed to Olympic city bid campaigns. She holds a bachelor’s degree in English literature with creative writing from the University of East Anglia in the UK.TMFemmanewberyStocks MentionedS&P 500 IndexSNPINDEX: ^GSPC$6,581.00(+1.15%)+$74.52NASDAQ Composite IndexNASDAQINDEX: ^IXIC$21,946.76(+1.38%)+$299.15Dow Jones Industrial AverageDJINDICES: ^DJI$46,208.47(+1.38%)+$631.00*Average returns of all recommendations since inception. Cost basis and return based on previous market day close.