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REFILE-WRAPUP 2-Regulators to meet as brokers call time on Reddit-trader rollercoaster

(Corrects to “Treasury Secretary” from “Treasury Security” in paragraph 8)

* GameStop sinks 28% in early European deals, AMC off 9.6%

* GameStop stock has fallen 80% from last week’s peak

* “Party is probably over” - stockbrokers

* Yellen to convene U.S. regulators

Feb 3 (Reuters) - Hedge funds, small investors and 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 and cinema operator AMC Entertainment.

But small traders’ darling stocks have tumbled as their brokers imposed buying curbs, with GameStop now down 80% from a peak a week ago and AMC off 60%. GameStop’s Frankfurt-listed shares sank another 28% in early deals, while AMC was down 9.6%.

Their U.S.-listed stocks had scaled as high as 2,300% and 800%, respectively, since mid-January, fuelled by posts on the popular Reddit forum WallStreetBets.

Silver, 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 Secretary Janet Yellen and the heads of the Federal Reserve and the Commodity Futures Trading Commission, possibly 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.

It was not clear if any meeting could 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 financial markets, while small traders are bracing for a showdown.

“Final 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 stock markets 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 highs 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 organized buying over Reddit. Posts encouraging silver buying also boosted prices on Monday, although that proved short lived.

“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.

Online 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 needs stemming from the trading boom.

Robinhood further relaxed some of its restrictions on trade on Tuesday, increasing buying limits on GameStop stock, for example, from 20 shares to 100 shares.

GameStop’s U.S.-listed shares open for pre-market trade at 0900 GMT.

Reporting by Tom Westbrook in Singapore and Sagarika Jaisinghani in Bengaluru; Editing by Vidya Ranganathan, Jane Wardell and Bernard Orr

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