Hold the line, please para que sirve el medicamento levofloxacino de 500 mg No change is imminent at Nasdaq. In fact, Greifeld, the 56-year-old executive who has run the exchange operator for more than a decade, signed a new, five-year contract last year and sources say he has no immediate plans to retire. He also has strong support from directors, who see recent high-profile glitches such as a three-hour-long trading halt last month as par for the course in a technology-driven industry and feel Nasdaq is unfairly singled out for its mistakes.
