(Adds Gamestock RIC)
* GameStop (NYSE:GME) stock has fallen 80% from last week's peak
* "Party is probably over" - stockbrokers
* Yellen to convene U.S. regulators
By Tom Westbrook
SINGAPORE, Feb 3 (Reuters) - Hedge funds, small investors and their stockbrokers are bracing for tougher U.S. markets regulation, with officials expected to meet this week to assess the fallout from a social-media driven trading frenzy that has roiled stocks and silver prices.
Mass buying by amateur traders over the past two weeks has driven wild price gyrations in companies that big U.S. fund managers had bet against, including videogame retailer GameStop GME.N and cinema operator AMC Entertainment AMC.N .
As their brokers have imposed buying curbs, small traders' darling stocks have tumbled for two days running. Early trade in their Europe-listed shares on Wednesday will be the next guide as to whether they are in freefall just as regulators circle.
GameStop shares have fallen 80% from a peak a week ago, while AMC Entertainment stock has shed 60%. The stocks had gained as much as 2,300% and 800% respectively since mid-January, fuelled by posts on the popular Reddit forum WallStreetBets.
Silver XAG= , which briefly surged on Monday as small traders bought up the metal, steadied about 10% below its recent peak.
"The unwind is obvious," said Oriano Lizza, premium sales trader at brokerage CMC Markets in Singapore. But he added that it would be easy for nimble small investors to regroup and target fresh companies.
"I think from a regulatory standpoint the concern is that they could continue to do this," he said.
The head of the U.S. Securities and Exchange Commission, which regulates markets, will meet with Treasury Security Janet Yellen and the heads of the Federal Reserve and the Commodity Futures Trading Commission as soon as Thursday, a Treasury official told Reuters.
Yellen has asked to discuss recent volatility and whether trade has been consistent with fair and efficient markets. is not clear if it will result in action, but experts expect focus to also fall on the ever-larger role played by non-bank firms such as hedge funds in the financial markets and small traders are bracing for a showdown. boss fight. It's happening tomorrow with Yellen, SEC and Federal Reserve," read one Wednesday post on Reddit. "They are either going to try and stop the party or they are looking for money to pay us and not crash everything at the same time."
RETAIL MANIA
Small investors' participation in stockmarkets has exploded over the past year as pandemic lockdowns, volatility and stimulus payments have driven a worldwide day-trading craze.
The phenomenon has pushed equity indexes from New York to Seoul to record heights and boosted the price of assets from cyptocurrencies to new stock market listings.
The assault on GameStop short-sellers took it to a new level as small traders appeared to act in concert as they organised buying over Reddit. Posts encouraging silver buying also boosted prices on Monday, although that proved shortlived.
"The power of the retail investor exists," said Chris Brankin, CEO at TD Ameritrade in Singapore.
"We could see other similar events more regularly, but be sure the regulators will look to curb any market (volatility) or manipulation," he said.
In the washup, Melvin Capital, one of the biggest funds betting on a drop in GameStop's share price, lost 53% in January. Others, such as billionaire investor Steven Cohen's Point72 Asset Management lost nearly 9%, investors said. broker Robinhood has also come under pressure and has scrambled to raise more than $3 billion in a week as it races to meet funding neets stemming from the trading boom. further relaxed some of its restrictions on trade on Tuesday, increasing buying limits on GameStop stock, for example, from 20 shares to 100 shares. listed GameStop shares begin trading at 0700 GMT and they open for U.S. pre-market trade at 0900 GMT.
<^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ EXPLAINER-How retail traders squeezed Wall Street for bets against GameStop
TAKE A LOOK-From Reddit rally to regulatory scrutiny: The retail trading frenzy
ANALYSIS-GameStop saga expected to revive scrutiny of hedge fund industry
Young, confident, digitally connected - meet America's new day traders
EXPLAINER-How a GameStop share pullback could hurt some investors
FACTBOX-The long and short of it: GameStop and other market squeezes