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Is it possible for all the owners of a stock to gain or lose money at the same time?
The Owners of stock keep changing with every Buy and Sell. Hence its theoritically possible that everyone makes or loses money. Say the price was $10 when everyone purchased the stock. If the stock is doing good and the markets are good, the stock will move up to $12. Everyone sells the stock to someone else. So all the Old owners have made $2. Now after some period of time, the stock / company is not doing so well, and the markets are bad, so the stock falls to $11, everyone sells. So all the current owners make a loss of $1.   However in normal market conditions, there are Owners who have purchased stock at different price points and have held it irrespective of whether the price has gone above their purchase price or below their purchase price.