All you need to do is have your broker review the trade and confirm that there is no way that this trade was executed at the NBBO, or National Best Bid or Offer. The NBBO is a regulation that requires that your sell order be executed at the best bid price available at that time.
There was a buyer of 4300 shares at $18.85 on another platform than ARCA but my broker sent the order to ARCA. Is this reprehensible?
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