Yes, you can!
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You can even trade in fractions.
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But sorry – no after-hours trading or crypto at the moment.
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Trading in the app is kept separate from your other savings goals, in a tab of its own.
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If you want to start trading individual stocks, make your way to the Invest tab in the app, make sure you're toggled to Trading, hit the big + sign, and add the stock you want to buy.