Which company became the fourth US company to reach a US$1 trillion market capitalization?

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Alphabet became the fourth US company to reach a US$1 trillion market capitalization.

Alphabet briefly crossed the threshold during trading on January 16, 2020. The parent company had been created in 2015 to organize Google and several other businesses under a broader corporate structure.

Google’s search engine and advertising business formed the financial foundation of Alphabet’s valuation. YouTube, Google Cloud, Android, and other products also contributed to the company’s growth and helped investors view it as more than a single search service.

Alphabet followed Apple, Amazon, and Microsoft-related market milestones in the trillion-dollar club. Such rankings depend on the precise measurement: an intraday crossing can occur before a company records a full-day closing valuation above the same level.

Source: Wikipedia · fact-checked Oct. 2026

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