Lowest share size without running into problems

wtf were you doing. Tell me it was BRK-a

 

Also, if you trade odd-lots, then place stops, these stops will not show up on the tape, therefore, will likely not get executed...They are executed only if someone will take the other side of the trade from you individually...

 

I bet he made pretty good change doing that. He was exploiting the system's automatic execution.