In May they sold 45M shares in one week, which was about 25% of the total volume. It might have been less, the announcement of the ATM offering and announcement it was concluded were one week apart so I'm assuming it took the whole week. But they could have sold it more quickly and been a higher percentage.
On Friday GME traded 182M shares, so 75M would have been around 40% of the volume. They did not announce conclusion of the sale on Saturday, so it seems likely they still have shares left to sell. But at 25% of the volume they should be done today. My guess is they had very few shares left before today because when they sold 25% of the volume that week in May the stock price only dropped from $23 to $19, while the stock price was utterly crushed on Friday, which implies they sold higher than 25% of the shares traded.
What should be scary to DFV is that the 45M share sale netted $21/share, so clearly management is happy to sell shares above $20, and nothing stops them from doing additional ATMs if the price increases again. He paid over $5/share for put options for 12M shares with a June 21 expiration, so it looks very likely he's going to take a big loss and is at significant risk of having them expire worthless for a $65M loss.
Establishing a huge option position that was barely in the money and expires in 3 weeks to bet on a short squeeze in a company that just demonstrated that they are now ready to drop ATM offerings at a days notice seems like one of the dumbest trades in world history. But I still have to wade through numerous tweets on my timeline proclaiming Keith Gill is really an incredible actor who faked everyone out playing an idiot on livestream while he's actually playing Putin level 5D chess.