No
https://www.investopedia.com/ask/ans...-at-this-time/
Quindi puoi fare compravendita sostanzialmente sempre, anche se ovviamente volumi sono molto minori e i gap tra buy e sell possono essere molto piu' ampiWhat Is After-Hours Trading?
After-hours trading is the period of time after the market closes when an investor can buy and sell securities outside regular trading hours. Both the New York Stock Exchange (NYSE) and the Nasdaq normally operate between 9:30 a.m. and 4:00 p.m. Eastern Time. Trades during the after-hours session can be completed anytime between 4:00 p.m. and 8:00 p.m. Eastern Standard Time.
https://www.investopedia.com/ask/ans...ck%20exchange.