Behind

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Behind

Used for listed equity securities. At the same price but entered after your order/interest, such as on the specialist's book. Antithesis of ahead of you.

Behind

On an exchange, referring to a record of a trade that occurs at the same price as another trade, but is nonetheless listed after that other trade in a specialist's book. See also: Ahead.
References in periodicals archive ?
You are an honest person and going behind someone's back is the worst thing you could have done.
He said: "Jackie is straight down the middle, he wouldn't do anything behind someone's back.
``I'm not the kind of person who would go behind someone's back. In an interview I was asked to comment on a number of band's outfits, including ours,and I commented on them.