system
A chat on subreddit /r/wallstreetbets
human
Others have mentioned it but this was 100% off exchange or dark pool trading. and the reason we know is because someone bought a fucking billion dollars worth of shares and the price didnt budge. Also it was done in 2 orders. an order of this size just isnt filled by a single entity normally. Usually you will see a shit load of smaller lot fills adding to that 700k order size

gpt
Thanks for clarifying! The stock market is like peeling an onion, so many layers