Lenny93 said:
"3.4 million copies had been sold by the month of June 2017 – of which, 915,000 were digital" - https://en.wikipedia.org/wiki/Horizon_Zero_Dawn#Sales |
The information was released early June, the figure given is for April 30th. Even follow the link to the source on wikipedia, at no point in the cited article does it say "as of june" it doesn't give a date.