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Iran war proves this golden Wall Street rule right, yet again

Brett Arends
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Investors preemptively priced in a rapid resolution to the Iran conflict before President Trump’s April 2026 address, demonstrating Wall Street’s "buy on the rumor, sell on the news" adage in real time. The principle suggests markets rally ahead of anticipated positive events—like geopolitical de-escalation, corporate announcements, or economic upticks—only to correct once the news becomes official. Analysts note the pattern reflects traders’ tendency to act on expectations rather than confirmed outcomes, often leading to volatility when reality diverges from speculation. Veteran financial writer Brett Arends highlights the rule’s persistence, citing decades of market behavior where foresight drives short-term gains more than the events themselves. The phenomenon underscores how investor psychology, not just fundamentals, dictates market movements during crises, reinforcing the rule’s enduring relevance in high-stakes scenarios.
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Iran war proves this golden Wall Street rule right, yet againListen(4 min)Listen(4 min)There’s a well-known saying among old hands on Wall Street: “Buy on the rumor, sell on the news.”In other words, expect a rally in securities prices in anticipation of good news — whether it’s a possible outbreak of peace in the Persian Gulf, a company launching a new product or even some positive economic data.About the AuthorBrett Arends is an award-winning financial writer with many years experience writing about markets, economics and personal finance. He has received an individual award from the Society of American Business Editors and Writers for his financial writing, and was part of the Boston Herald team that won two others. He has worked as an analyst at McKinsey Co., and is a Chartered Financial Consultant. His latest book, "Storm Proof Your Money", was published by John Wiley Co.A Dow Jones CompanyCopyright © 2026 MarketWatch, Inc. All rights reserved.

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