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Exchange Circuit Breakers

Stock exchanges take measures to ease panic selling by invoking Rule 48 and halting trading when markets have severe downside movements. Under the 2012 rules, market-wide circuit breakers, or curbs, kick in when the S&P 500 index drops 7% for Level 1; 13% for Level 2; and 20% for Level 3 from the prior day’s close. A market decline that triggers a Level 1 or 2 circuit breaker before 3:25 pm EST will halt trading for 15 minutes, but will not halt trading at or after 3:25 p.m.

LevelMarket DeclineHalt Trading Time 
Level 1
7%15 minutes
Level 2
13%15 minutes
Level 3
20%Close
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Related Issues
I bought stock on the NYSE/ NASDAQ. It has now been delisted and is currently being traded on the OTC markets. What should I do?
Will my positions be liquidated forcibly due to market value decline?