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Why Is the Stock Market Up Today, 3/17/26?

Story Highlights
  • Stocks are rising ahead of a potential Hormuz Coalition announcement later this week.
  • Memory stocks are leading the tech sector higher.
Why Is the Stock Market Up Today, 3/17/26?

The S&P 500 (SPX) and the Nasdaq 100 (NDX) are trading higher on Tuesday as investors digest new developments in the U.S.-Iran war and several updates in the tech space.

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President Trump could announce the countries participating in the Hormuz Coalition as soon as this week, although allies such as Australia and Japan have indicated that they are unlikely to join. The coalition seeks to safely escort oil tankers through the Strait of Hormuz as the passageway remains largely halted.

Tech Gains Boosted by Nvidia GTC 2026 and New Deals

Elsewhere, memory stocks, like Micron (MU), SanDisk (SNDK), and Western Digital (WDC), are continuing to trade higher after Nvidia (NVDA) held its GTC 2026 event on Monday. In addition, Qualcomm (QCOM) announced a $20 billion share repurchase program and a dividend hike to 92 cents from 89 cents.

Amazon (AMZN) made headlines after announcing a deal with OpenAI that will provide government agencies with AI models through Amazon Web Services (AWS). Finally, Mastercard (MA) agreed to acquire BVNK for up to $1.8 billion in its latest push into the stablecoin industry.

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