Robinhood Markets Inc. reduced the number of companies with trading restrictions to eight from 50, ahead of Monday’s trading session, according to an update on its website.

The current list includes GameStop Corp., AMC Entertainment Holdings Inc., BlackBerry Ltd., Express Inc., Genius Brands International Inc., Koss Corp., Naked Brand Group Ltd. and Nokia Oyj.

Opening new positions in these securities is limited, according to Robinhood’s website, which listed the maximum number of shares and options contracts each user can hold. For those whose current holdings already exceed the limits, their positions won’t be sold or closed.

Robinhood put buying restrictions in place after its clearinghouse deposit requirements for equities increased last week, the company said in a blog post on Friday. “It was not because we wanted to stop people from buying these stocks,” Robinhood said.

Rumors that the company was pressured by Citadel or other market makers to restrict trading on GameStop and other “meme stocks” are false, Robinhood CEO Vlad Tenev said on social audio app Clubhouse in an appearance with Tesla Inc. Chief Executive Officer Elon Musk. Rather, it was because the National Securities Clearing Corp. sought $3 billion in deposits, which the firm negotiated down to US$700 million, he said.

“We knew this was a bad outcome for customers,” Tenev said. “But we had no choice as we had to conform to our requirements.”

The trading app, popular among retail investors who fostered the rise of GameStop stock, has been under fire across the political spectrum for its decision to restrict trading of high-flying stocks that surged after being touted on social media.

Senator Elizabeth Warren on Sunday called for a broader review by the U.S. Securities and Exchange Commission on recent trading swings and said a broker-dealer like Robinhood that invites a lot of individual investors needs to operate “under some basic rules.”

“You can’t do that in the middle of a trading cycle,” Warren said of Robinhood’s trading limits on CNN’s “State of the Union.” “It’s not about protecting people from making bad trades. It’s about keeping the playing field level.”

A representative for Robinhood declined to comment beyond the website’s update.

Multiple lawsuits have been filed against Robinhood, mostly alleging restrictions by the trading platform that amounted to a breach of contract. Still, investors who sued online brokerages over claims they were unfairly blocked from trading shares may have a long wait before their cases are resolved.

--With assistance from Annie Massa and Meghan Genovese.