RE: Code 114 May 2021 15:02
It is not a FACT whatsoever, it's a laughable old wives tale, which is occasionally propped up by coincidence.
I've seen 1 share traded many many times on various equities, and people start shouting about the '1 code myth', never followed by an RNS.
In answer to your questions, noone woke up and decided to trade one share. It'll likely be an algorithm testing the buy or sell price.