On June 2nd, the NASDAQ Stock Market announced that it will implement a single stock circuit breaker, the NASDAQ Volatility Guard, which will pause trading based on predetermined thresholds across all NASDAQ-listed securities. The NASDAQ Volatility Guard will allow data to be universally available before, during and after the trading pause. Additionally, the reopening process will be available to all market participants. The NASDAQ Volatility Guard will go into effect in the third quarter of 2010. NASDAQ Press Release.