buy on close: translation
The " close" is the last two (depending on the exchange) minutes of the trading day. During the close there is a range of prices known as the closing range. To "buy on close" means that you buy during the close. The CENTER ONLINE Futures Glossary
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buying at the end of the trading session at a price within the closing range. Bloomberg Financial Dictionary
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To buy at the end of a trading session at a price within the closing range. Chicago Mercantile Exchange Glossary