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You missed the 4:1 split in August 2020. If the rest of the calculation is correct, the value of those 18 millions stock would be almost 500 billions

That article was written just a few days before the last 4:1 stock split took place, so it's just a snapshot in time.

However, accounting for that last 4:1 split, Microsoft's 18.1 million shares would now be 72.4 million shares at the last closing price of $165.35.