After regular trading hours, trades can still be executed through electronic communication networks or other alternative trading systems. These trades, known as after-hours trading, allow investors to buy and sell securities outside of normal market hours. However, it is important to note that after-hours trading may have different rules and risks compared to regular trading hours. For instance, there may be lower liquidity and wider bid-ask spreads during these times. It is crucial for investors to understand the potential implications of after-hours trading before making any trades.