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Ciena Moves Up In Market Cap Rank, Passing Aon

BNK Invest | Oct 7, 2026 4:38 PM EDT


In the latest look at the underlying components of the S&P 500 ordered by largest market capitalization, Ciena Corp (Symbol: CIEN) has taken over the #202 spot from Aon plc (Symbol: AON), according to The Online Investor.

Market capitalization is an important data point

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