Citigroup shares were halted at 1:03 p.m. EDT on the New York Stock Exchange Tuesday after a trade of $3.3174, or 12.7 percent below the previous trade of $3.80 crossed the tape.
The stock drop triggered a new circuit breaker that the exchange adopted following the May 'flash crash' in which markets plunged out of control, the NYSE said.
Citigroup's [C 3.79 -0.21 (-5.25%) ] shares were halted for 5 minutes and reopened at $3.80, down 5 percent for the day.
The shares last traded down 5.5 percent at $3.78.
The stock specific circuit breaker, adopted earlier this month by all U.S. exchanges, halts S&P 500 stocks that move more than 10 percent within a 5-minute period.
