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If I have 10,000 stocks to sell with 23 B market cap
First a quick terminology correction: I believe you're proposing selling 10,000 shares of the stock of a company, not "10,000 stocks". When you sell, you need to decide whether you're selling for a specific minimum price or just selling for whatever price you can get. If you set a specific lower limit on asking price, then if people aren't interested at that price it doesn't sell. Which may mean you sell only a few shares, or none if your asking price isn't considered reasonable. If you want to sell independent of price, then as you begin to flood the market with your shares, the price you get per additional share may decline until it finds a buyer. What that lower limit is will depend on what people think the stock is currently worth. This is one of the many complications I don't want to deal with, which is why I stick with index funds.