Based on your financial expertise, provide your response or viewpoint on the given financial question or topic. The response format is open.

Stocks: do Good Till Cancelled orders get executed during after hours?
You typically need to specify that you want the GTC order to be working during the Extended hours session. I trade on TD Ameritrade's Thinkorswim platform, and you can select DAY, GTC, EXT or GTC_EXT. So in your case, you would select GTC_EXT.