NYSE invoked Rule 48 before the open
I better bone up on that rule:
“The S&P 500 has a median return of negative 1.14 percent on days that Rule 48 has been invoked, according to data from…”
“With the call this week and three last week, Rule 48 has been invoked 77 times its creation…The majority of occurrences were during the … financial crisis: That includes 35 times in 2008, nearly half of its total uses. There's just a handful of times its been invoked three times in a row and hasn't been called four times in two weeks since October 2008.”
http://www.cnbc.com/2015/09/01/how-to-t ... le-48.html
“Unlike a circuit breaker that stops stock trading, Rule 48 speeds up the opening by suspending the requirement that stock prices be announced at the market open.
To invoke Rule 48, an exchange would have to determine that certain conditions exist that would cause market disruptions. Those conditions include:
- volatility during the previous day's trading session
- trading in foreign markets before the open
- substantial activity in the futures market before the open
- the volume of pre-opening indications of interest
- government announcements”
More here plus full text of the rule:
http://www.cnbc.com/2015/08/24/rule-48- ... arket.html
"And in what was quite likely a first for hidden stock exchange protocols—Rule 48 was trending on Twitter."