Closing auction gap calculator: the close versus the last regular trade
The price you watched all afternoon and the price on your statement can differ. Enter both and see what the gap does to your position.
How it works: the screen shows a last trade all afternoon. At the close, many stocks run a closing auction. Buy and sell orders pile up and meet at one price. That price is the official close. Your statement uses it. Enter your shares, the last trade you saw, and the auction price. The tool marks your position to each and shows the gap.
Two prices, one close
The last regular trade is the last price that printed before the auction. The auction price can be higher or lower. If it is lower, your position is worth less on the statement than it looked on the screen. The worked example is in the closing auction came in below the last trade.
Where each price shows up
The official close is the number in closing price. Trades after the bell are a separate story, covered in pre-market and after-hours. A stop or limit order may have run on the first price and not the second.
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