Glossary · A
What is Aggressor?
The side of a trade that crossed the spread with a market order (or a marketable limit order) and "hit" a resting order. Buys at the ask are aggressive buys; sells at the bid are aggressive sells.
In context
The aggressor, also called the initiator, is the order that causes a trade to happen at the moment it arrives. CME's own market-data documentation uses essentially this definition: the aggressor is the order that, when entered into the book, immediately triggers a trade. Usually it is a market order or a marketable limit order.
Learn it in depth
Related terms
Market orderLimit orderSpreadAsk (offer)Bid
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