USA - Myth20 Aug 2020 13:27
More for newbies to help digest why they shouldn't listen to any 2:30 blx
A US listed company doesn't release an RNS however they may issue a GNW which can be and usually are released well before US trading begins as both Europe and Asia are up and trading. (example imanage based in Chicago released GNW regards a deal with a law firm in Texas over an hour ago which is 3 1/2 hours before US markets open) (Nordic is another from this morning NYSE, you get the idea)
The timing of their markets opening are completely irrelevant, coupled with the fact that whilst their markets open 14:30 here they will have been up and trading around 3 hours before this