It's a legal requirement to some extent unless you have a margin account. Funds take two days to settle. If you sell, buy, and sell again within two days, you

It's a legal requirement to some extent unless you have a margin account. Funds take two days to settle. If you sell, buy, and sell again within two days, your account can be suspended for violating SEC rules. https://www.ally.com/do-it-right/investing/what-are-unsettled-funds/ https://www.ally.com/do-it-right/investing/what-are-unsettle...