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How can I find out what factors are making a stock's price rise?
At any moment, the price is where the supply (seller) and demand (buyer) intersect. This occurs fast enough you don't see it as anything other than bid/ask. What moves it? News of a new drug, device, sandwich, etc. Earning release, whether above or below expectations, or even dead-on, will often impact the price.  Every night, the talking heads try to explain the day's price moves. When they can't, they often report "profit taking" for a market drop, or other similar nonsense. Some moves are simple random change.