The New York stock Exchange uses the little - used rule 48 for three days in a row to pre - empt panic trading this week . This was due to concerns before Monday 's open over a dramatic drop in pre - market open futures . rule 48 speeds up the pace of trading by suspending the requirement that stock prices be announced at the market open , with those prices having to be approved by stock market floor managers prior to trading commencing .
The New York Stock Exchange invoked the little-used Rule 48 for three days in a row to pre-empt panic trading this week. This was due to concerns before Monday's open over a dramatic drop in pre-market open futures. Rule 48 speeds up the opening of trading by suspending the requirement that stock prices be announced at the market open, with those prices having to be approved by stock market floor managers prior to trading commencing.