Data Error Halts NGM Trading

At 10:45am last Tuesday, Feb. 19, the exchange halted trading and took its electronic platform offline to correct the problem, after trading firms experienced problems quoting in derivatives contracts.

Officials say a mistake the previous day deleted all instrument data and order book changes made between Dec. 4 and last Tuesday, resulting in a blackout of data for instruments added or changed since Dec. 4.

"The missing instruments were sent out as 'withdrawn,'" according to John Sjöberg, chie