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I've just placed a LIM OPG order for a NYSE-listed stock, waited until 09:31, and seeing it did not fill, I requested to cancel it (via the API) and, to my surprise, it was successfully canceled.

But what does it even mean to cancel an auction order after the auction has happened? Does it even make any sense?

Does the auction not happen in an instant, but rather it happens over a span of time?

Or does this look like unusual behavior which may have more to do with how my broker is passing messages around internally?

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    $\begingroup$ Good question, I'm wondering that as well. $\endgroup$
    – Contango
    Commented Feb 3, 2023 at 14:58
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    $\begingroup$ What was the ticker? $\endgroup$
    – amdopt
    Commented Feb 4, 2023 at 17:55
  • $\begingroup$ @amdopt I canceled a BOC sell [email protected] qty=7 @ 9:31:30am $\endgroup$
    – Gabi
    Commented Feb 4, 2023 at 21:55
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    $\begingroup$ An auction attempt takes place at 9:30:00 but it cannot conclude if the resulting price would be more than 10% off from the reference price. The stock is stuck in an unopened conditon, but orders can be entered (or cancelled!) and eventually the stock will begin trading. Can take a few minutes. $\endgroup$
    – nbbo2
    Commented Feb 5, 2023 at 8:25

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