This is a reddit meme that billionaires never sell stock. For anybody with a large amount of stock, they must make all their trades public. Take Bezos for example, you can see a list of his trades here:
https://www.nasdaq.com/market-activity/insiders/bezos-jeffrey-p-48340
Or Elon Musk:
https://www.nasdaq.com/market-activity/insiders/musk-elon-831665
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