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Re:Robinhood denies claims that it sold GameStop shares out ... by MattGaiser on Friday January 29, 2021 @05:13PM (#25963396)
It is also margin trading if you buy and sell before settlement. Buying a stock, selling it a day later, and using the funds to buy something else requires a margin account.

https://www.fidelity.com/learning-center/trading-investing/t...

Re:Robinhood denies claims that it sold GameStop shares out ... by kllrnohj on Friday January 29, 2021 @05:29PM (#25963592)
> It is also margin trading if you buy and sell before settlement

Not always, see situation #3 https://www.sec.gov/oiea/investor-alerts-and-bulletins/ib_ca...

You need margin to engage in day-trading, but you can sell a settled stock & immediately use the funds to buy something else just fine as long as you then hold onto that purchase for 2 days.