The launch by Revolut comes amid a broader surge in retail trading, which escalated last year when investors latched onto so-called "meme stocks" that included retailer GameStop and cinema group AMC Entertainment.
U.S. retail traders bought approximately $281 billion worth of stocks in 2021, up from $38 billion in 2019, according to Vanda Research.
The new offering is part of Revolut's quest to become a so-called "superapp," where consumers can manage every aspect of their finances, the company said. Revolut also offers payments services, cryptocurrency trading and savings accounts.
"This to us was just the next logical step," said Gabe Vallejo, Revolut's U.S. head of wealth and trading.
U.S. Revolut customers can trade full and fractional shares of more than 1,100 securities listed on the New York Stock Exchange and Nasdaq, including more than 200 exchange-traded funds.
Zero-commission stock trading is already available to Revolut users in the United Kingdom and Europe. The company was valued at about $33 billion through an investment round in July, and is currently Britain's second-most valuable fintech company after Checkout.com.
Revolut launched in the United States as a banking app in March 2020, and secured a U.S. broker-dealer license in September 2021.
Similar to Robinhood, Revolut will rely on payment for order flow (PFOF) to earn revenue through its commission-free trades, a controversial practice in which brokers route trades to market makers in return for a fee.
The Securities and Exchange Commission is currently considering whether to reform or ban the practice. Chair Gary Gensler has expressed concern that commission-free trading brokerages may encourage investors to trade more, in order to capture more PFOF, even if that is not in the investors' best interest.
Vallejo said Revolut is not concerned about the SEC review and he expected Revolut will be able to evolve as necessary should the rules change.
"We're confident we can continue to offer this product to our customers in the most efficient manner possible," he said.
(Reporting by Hannah Lang in Washington; editing by Michelle Price and Richard Pullin)
By Hannah Lang