Ciena Corp. (CIEN) is to replace Dayforce (DAY) in the S&P 500, effective prior to the opening of trade on Monday, 9th February

Ciena Corp.

Newsquawk StaffPublished 4 Feb 2026, 22:44 UTCOn the live feed at 22:24 UTC — 1 more headline followed before this page went public

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Ciena Corp. (CIEN) is to replace Dayforce (DAY) in the S&P 500, effective prior to the opening of trade on Monday, 9th February

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Qualcomm (QCOM) says Q2 FY26 guidance is to reflect significant industry-wide DRAM shortage as memory supplies shift capacity to AI-focused HBM, driving higher prices and constrained handset production

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Context

replacing Dayforce in the S&P 500 indicates a shift in index composition, which often leads to increased buying pressure for Ciena due to index fund rebalancing. Such changes can also reflect a broader market sentiment regarding the companies' relative strengths and growth prospects. Traders should consider the potential for volatility in both stocks around the effective date, especially if any market participants are assessing the implications on sector weightings or overall index performance.

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