Premarket and after hours.
I use support levels.
I look at where the trades that took place at the cheapest price point took place.
If the stock doesn't hold that level then I sell.
Notion being is that everyone who chases on the news and held is now losing $. And losers sell
Conversation
I laughed at that response fr @MAlknteeb - if it looks like fish, and smells like fish: it's probably a pump n dumper. Sure reads that way.