DK

Acronym for "Don't Know." A security is said to be "DK'd" when it is delivered to the purchaser or more typically the purchaser's correspondent but is rejected because the purchaser either doesn't know or doesn't agree with one or more of the aspects of the trade. For example, a trade may be DK'd because of an incorrect price, amount, or CUSIP number. American Banker Glossary

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The two-character ISO 3166 country code for Denmark. Bloomberg Financial Dictionary

See also: Don't know