An article came out in WSJ identifying reddit user DeepFuckingValue as Keith Gill, who also goes by Roaring Kitty on youtube.

I did not expect that we would find out the identity so soon at all, so immediately my skepticism alarms are set off. I have watched a bit of his youtube channel, he does talk about GME a LOT, but no matter how much I skipped around to try to look at different screens he's showing I couldn't see him showing how much he was holding (what would have been the clearest proof). He posts on Twitter as Roaring Kitty and posts quite often, with a very different tone of writing than what you find in DFV's sparse comments. There is also a reddit account u/RoaringKitty, which only has one post from 5 years ago to the dead domain roaring-kitty.com. And of course the DFV account hasn't verified his identity either.

I don't understand why DFV would come out and reveal himself and make himself a target on today of all days. Keith Gill seems like kind of a goofball to me. I have to wonder if he was put up to assuming the identity for narrative control purposes.