Between 15 February 2019 and 31 October 2019, which company from among Alphabet, Amazon, Apple, and Microsoft will first reach an end-of-day
market capitalization of $1 trillion?
After Apple and Amazon each crossed the trillion-dollar threshold in 2018, tech companies have seen declines in their market capitalization (Financial Times, CNBC). Outcome will be determined by the end-of-day "Market Cap" reported by Bloomberg for Alphabet (Bloomberg), Amazon (Bloomberg), Apple (Bloomberg), and Microsoft (Bloomberg). If two or more companies reach an end-of-day market capitalization of $1 trillion on the same day, the question will resolve on the company with the higher market capitalization.
Microsoft Corporation closed above $1 trillion in market capitalization on 30 April 2019 (https://www.bloomberg.com/quote/MSFT:US).