Biggest Public Company? Microsoft. Wait, Apple Again. Amazon? No, Back to Microsoft.

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Within minutes of the stock market’s opening trades on Tuesday, Apple had reclaimed the title of most valuable American company for the first time in more than two months.

By around midday, Microsoft had taken back the top spot. And so the day went, the two tech titans going back and forth, until trading ended with Microsoft the leader at a market value of $823 billion.

The positions of Apple, Microsoft, and Amazon have been flip-flopping since the wipeout in the iPhone maker’s stock price late last year. The mantle has changed hands seven times among the three companies. Three of those switches have taken place over the past week as the big tech companies reported quarterly results. And Alphabet (Google’s parent company) has lurked not far behind the whole time.

The competition reflects the global economic concerns hanging over the markets as well as the changing technology landscape, and it’s a shift from past years. Apple passed Exxon Mobil to become the most valuable company in the United States almost eight years ago, and after 2012 it held on, largely unchallenged, for six years.

The company’s ascension was a precursor to Big Tech’s takeover of the stock market. Investors scooped up shares of the largest tech companies, believing their sales growth was unassailable, and by the second half of 2016, Facebook, Amazon, Microsoft, Alphabet and Apple were the five most valuable companies in the S&P 500.

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