What are the after hours trading NY stock?

After hours trading and Pre-market trading is identical to regular trading hours. Regular trading is from 9:30 a.m. to 4:00 p.m. After hours is 4:00 p.m. to 8:00 p.m. Pre-mkt is 4:00 a.m. to 9:30 a.m. The difference between regular trading hours and two mentioned is only futures traders can buy/sell securities. Note that futures traders buy/sell the same stocks you own which affects the price. This is why sometimes stocks have opening gaps when the regular market opens the next day. This is why Apple's stock can close at $500 but open at $600 the next day--because it continues to be trader after hours.