KEY POINTS
  • "Wallstreetbets" Reddit chat room briefly went private on Wednesday.
  • The community gathered an army of rookie day traders who go after heavily shorted stocks, pushing share higher and squeezing out short-selling hedge funds.
  • The forum's members topped three million as of Wednesday.
  • "We have grown to the kind of size we only dreamed of in the time it takes to get a bad nights sleep," WSB's moderators said in a post.

"Wallstreetbets" Reddit chat room, where retail investors marshal against short sellers, briefly went private on Wednesday evening, limiting access to outsiders.

The community gathered an army of rookie day traders who go after heavily shorted stocks, pushing share prices higher and squeezing out short-selling hedge funds. The forum's members topped three million as of Wednesday.