NOG trading again-seemed like a 5 minute halt was

NOG trading again-seemed like a 5 minute halt was called widely but trading again
-nog down 58%

Exchange Circuit Breakers

Stock exchanges can also take measures to ease panic selling by invoking Rule 48 and halting trading when markets have severe downside movements. Under 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 p.m. Eastern Time will halt trading for 15 minutes, but will not halt trading at or after 3:25 p.m.

Circuit breakers can also be imposed on single stocks as opposed to the whole market. Under current rules, a trading halt on an individual security is placed into effect if there is a 10% change in value of a security that is a member of the S&P 500 Index, Russell 1000 Index or QQQ ETF within a 5-minute time frame, 30% change in value of a security whose price is equal or greater than $1 per share, and 50% change in value of a security whose price is less than $1 per share.