The 530pm est is an OCC rule. Each broker will have a different time when they will require exercise instructions. Most seem to want the information by 5pm in order to give them enough time to notify the OCC.TWTR's range from 4:00 PM to 4:30 PM on Friday was $36.9835 to $37.04. Which broker allows the 5:30 PM cut-off time?
- IB has it at 4:30 PM EST
- BMO InvestorLine at 4:00 PM EST
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