A glitch on the Nasdaq early Thursday afternoon brought trading to a halt for dozens of well-known companies.
The outage, which began just after noon, affected all Nasdaq stocks and options.
Trading resumed at 3:25 p.m.
Among the major companies that trade on Nasdaq are Google, Microsoft and Facebook.
According to the Wall Street Journal, the problem was caused by a data feed that provides market data for Nasdaq-listed securities.
Nasdaq says it will not cancel any open orders, and traders can cancel their orders if they wish.
The New York Stock Exchange briefly halted all Nasdaq securities at the request of the trading platform.