Hi all In the groups experience what is the earliest time , eastern standard time, when it's reasonable to say that IB have printed ( immutable) the close for all symbols that will be the number of record in perpetuity. So market close at 16:00 but there's going to be a period where the numbers are still being populated. I'm certain that someone has figured out what that "indeterminate" period is to a margin of safety. I asked IB sometime back but the support desk has never responded, I asked 3 time. thank you for any help OR thoughts. cp

Makes sense but the group would know, through experience, when it's reasonable to see that the US exchanges are printed. I am only interested in the PRINT after the close. It would be nice to think all is done by 16:00 EST but is that reality? Is it 16:05, 16:15... you get the idea. Thanks for the heads up though

Depends on what one deems reasonable here. Anything earlier than 20:00 i.e. the time when the listing exchanges post their definitive closing prints, will not be completely reliable.

thank you. That's the time I am running the cron job to get the historical data.