Robin Hood said it was restricting trades in the gaming retailer.

The stock has been at the center of a battle between small time traders and deep pocketed hedge funds that has shaken stocks around the world.

Interactive Brokers Group said Thursday that it, too, had restricted trades in a number of so called frenzy stocks like Gamestop theater chain AMC and BlackBerry.

TD Ameritrade did the same on Wednesday, driven by an army of individual traders using online brokerage APS like Robin Hood and anonymous social media messaging boards.

Shares of Gamestop have seen a powerful two weeks surge up an eye popping 1700% hammering fund investors who are betting the stock would fall.

Reddit discussion groups were once again humming on Thursday as membership of the trader focused group Wall Street bets raced past four million.

Veteran research analyst Michael Pachter of Wedbush Security said.

The whole thing feels like a pyramid scheme.

Wall Street bets theory is that you know, we will buy it a 20 somebody will buy it from us it 30 and that happened then the next group bought it 30 and somebody by from 40.

And it happened then 70.

Then 140 than 203 100.

And it will keep going up this long as demand stays high.

But the question is, you know, when does that demand dissipate?

Theater chain operator AMC, which has seen ticket sales almost totally evaporate due to the health crisis, has also gone along for the ride.

The stock has skyrocketed tenfold in just a matter of weeks, and it's not just US companies.

Several global stocks are caught up in the euphoria as well, which have Onley increased calls for regulatory crackdown.

Some professional market watchers say the current frenzy raises all sorts of questions with respect to possible market manipulation.

But supporters of the amateur traders say the social media, chat rooms and investing APS are democratizing the world of Wall Street.