Numerical trading limits are set once per quarter, and they are currently as follows:
During overnight hours:
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S&P 500 Futures: 5 percent Up or Down (60 points)
Dow Futures: 5 percent Up or Down (550 points)
Nasdaq Futures: 5 percent Up or Down (85 points)
At the open:
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Futures can trade down (only) as much as 10 percent. If they hit this limit, they can trade at (or exceed) this limit for 10 minutes. If they're still limit down after 10 minutes, there's a two-minute trading halt and we move to the next level (20 percent).
Same deal for the 20 percent level - if the same circumstances occur as described above, we then move to 30 percent.
If we hit 30 percent, that stays in effect for the remainder of the trading day.
Quelle: www.cnbc.com/id/27357308
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