As they happen, the trade doesn't count until the information has been released; should also works for when you release.

You are right, it would lead to rapid and nonsensical fluctuations in the market, but it would in turn force them to get off their asses and do something about it as all the trusts and big players continued to take it in the teeth because Nancy or whoever let her husband know the way the wind was blowing or even used her position of power to fan that shit in one direction or the other.