: How to calculate 1 share movement I'm trying to figure out how much the price of a stock will change if a particular amount of shares are sold at that time. "X stock" is at 0 per share. If I sell 1 share how much will

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The price of a share has two components:

Bid: The highest price that someone who wants to buy shares is willing to pay for them.

Ask: The lowest price that someone who has a share is willing to sell it for.

The ask is always higher than the bid, since if they were equal the buyer and seller would have a deal, make a transaction, and that repeats until they are not equal. For stock with high volume, there is usually a very small difference between the bid and ask, but a stock with lower volume could have a major difference.

When you say that the share price is 0, that could mean different things. You could be talking about the price that the shares sold for in the most recent transaction (and that might not even be between the current bid and ask), or you could be talking about any of the bid, the ask, or some value in between them. If you have shares that you are interested in selling, then the bid is what you could immediately sell a share for.

If you sell a share for 0, that means someone was willing to pay you 0 for it. If after buying it, they still want to buy more for 0 each, or someone else does, then the bid is still 0, and you haven't changed the price.

If no one else is willing to pay more than for a share, then the price would drop to next time a transaction takes place and thats what you would be able to immediately sell the next share for.

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Unless other people believe you have a reason for selling at a lower price, your sale probably has no lasting effect at all on the market. Of course, if people see you dump a few million dollars' worth of shares at a discount, they may be inclined to believe you have a reason. But if you just sell a few, they will conclude the reason is just that you needed cash in a hurry.