As of September 28, 2026, Nvidia, Apple, Microsoft, Amazon and Alphabet together represented about 30.7% of the S&P 500.

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Location PART 2 - FOUR HIDDEN CHIMNEYS CHAPTER 9: ARE UNICORNS REALLY WHITE? The Cold Start Problem

"As of September 28, 2026, Nvidia, Apple, Microsoft, Amazon and Alphabet together represented about 30.7% of the S&P 500."

State Street's index weights sum to about 30.7% when Alphabet's two listed share classes are combined, supporting the claim that five companies account for roughly a third of the S&P 500.

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Source title SPY: State Street® SPDR® S&P 500® ETF Trust

Source authors State Street Investment Management

Source year 2026

Confidence high

Importance mid