At launch, Robinhood said it will offer trading without foreign exchange fees, as well as no minimum account or costs for trading outside market hours.
Investors will be able to convert GBP to USD when they deposit or withdraw money, and will be charged an implicit third-party cost of 0.03%, the company said.
Robinhood said customers can start building their portfolio for as little as $1 and "grow their uninvested cash as they work out their investment strategy, earning 5% AER".
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Access to the Robinhood app will currently be given on a rolling basis, reaching full availability in early 2024, meaning UK customers will be asked to join a waiting list from today and will be notified when they will be granted early access.
Robinhood became well-known for being at the epicentre of the 'meme stock' frenzy of January 2021, which saw several hedge funds suffer a 'short squeeze' in their holdings of GameStop and Robinhood suspending trading on the stock.
"Since we launched Robinhood a decade ago, it has always been our vision to expand internationally," said Vlad Tenev, CEO and co-founder of Robinhood.
"As a hub for innovation, global finance and top tech talent, the United Kingdom is an ideal place for us to launch our first international brokerage product. We look forward to continuing to engage with customers and policymakers as we expand our offerings in the UK."
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Jordan Sinclair, president of Robinhood UK, added: "For too long, UK investors have incurred high fees to invest in the US markets and earned low returns on their uninvested cash. We are excited to give UK customers access to the Robinhood experience, remove unnecessary fees, and join our more than 23 million investors.
"Ahead of our general availability early next year, we will listen to feedback from customers and enhance the localised offering. This is just the beginning for Robinhood UK and our global ambitions."