The S&P 500 Index has rebounded sharply, turning positive for 2026 as easing concerns over the U.S.-Iran conflict lifted investor sentiment and restored confidence in equities. The rally was mirrored by the SPDR S&P 500 ETF Trust, with standout gains led by companies such as SanDisk Corporation, Lumentum Holdings, and Ciena Corporation, driven largely by booming demand tied to AI and data infrastructure.
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