There will be a 15-minute halt in electronic trading from 3:15 p.m. - 3:30 p.m. CT.
Trading on CME Globex will resume at 3:30 p.m. CT for the same trade date for 45 minutes, closing at 4:15 p.m. CT. This includes Fridays, meaning that the end of the trading week on CME Globex also will be changed to 4:15 p.m. Trades that occur between 3:30 p.m.-4:15 p.m. will be subject to the daily settlement prices calculated at 3:15 p.m. CT (i.e., settlement times will not change).
Trading will be closed from 4:15 p.m.-5:00 p.m. CT.
Trading re-opens at 5:00 p.m. on CME Globex (Sundays-Thursdays) for the new trade date.
Changes are effective for both U.S. and international equity index futures and options
So this means, I think, that it doesn't trade from 15:15 to 15:30 and from 16:15 to 17:00.
In effect it is the same as before except there is an extra 45min lost.
The other change is that the end of the ETH hours for Monday is 16:15 Monday and that Tuesday's session starts at 17:00 Monday instead of 15:30 Monday.
pretty stupid and confusing.
It also changes limit move calcs - but my mind glazed over trying to figure it out!
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