In the course of 1 stock day. What causes a stock price to rise and fall? Like is it as simple as the amount of shares bought at a certain time? Or is it more to that. Because i noticed that a person might buy 200k shares of a stock and the price would go up 4 cents per share but lets say someone else buys 750k of the same stock 1 hour later the stock would neither rise nor fall. Whats up with that?