blotter(redirected from blotters)
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A book or computer program (more commonly the latter) where a brokerage records all trades on a trading day to which it is a party. The blotter records all relevant details of each trade, such as whether the brokerage bought or sold shares, how many, what price, what time, and so forth. The blotter also indicates whether or not the trade settled as appropriate.
An accounting book of original entry used in the back office of brokerage firms for recording clearings, fails, trades, and so forth.