If you have a sell order in at $1, you can sell it higher if there is a bid at the higher price. A limit order is always filled at the limit price, or better. So if a better price is available, you will get it. It's a very situation specific occurrence. It all depends on who bids what price and # of shares they bid, and how many corresponding offers there are at the time.

Remember that all the other orders that were in ahead of yours will get filled before yours. So the stock could open up with a $3 bid, but you might not hit that price if there are sells in before you, and if those sells take out all the bids down below $1 before your order gets to the front of the line, your order will not fill, and will appear on the ask.

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If he listed it at $3 for example and you have a sell order from before at $1. Will it be sold at 3 or 1?

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