How do stocks go up after hours?

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Tags

1. #trading
2. #standard
3. #major
4. #occurs
5. #market
6. #stock
7. #investor
8. #exchange
9. #periods
10. #securities
11. #closes
12. #hours
13. #regular
14. #outside
15. #after
16. #exchanges
17. #through
18. #period
19. #investors