On Thursday, the?Nasdaq OMX Group Inc. (NASDAQ:?NDAQ) ceased some trading on its biggest options exchange, the PHLX, as “system issues” affected trading in some stock-options contracts.
?The action occurred in the morning before 10 a.m. ET and the news had been announced through a notice to traders, reported Dow Jones‘ Jacob Bunge. For those options contracts that had symbols beginning with the letter Z (this includes 20 stocks), trading had been stopped, possibly for the remainder of the trading day.
Meanwhile, some contracts only underwent temporary interruptions including such companies as International Business?Machines Corp. (NYSE:?IBM?) and Netflix Inc. (NASDAQ:NFLX?).
For the PHLX, once called the Philadelphia Stock Exchange, it is the largest of Nasdaq OMX’s?three U.S. options exchanges that it oversees. To-date in May, it has executed 20% of all options contracts, according to OCC.
The exchange did not send out a press release regarding the hiccup.?
For the day, Nasdaq OMX Group closed at $30.76, down 1.19%.