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Strange Days 03/29/2011

On 3/29/2011 from 9:30 AM through approx. 10:02 AM we witnessed extremely high and consistent quote bursts on a significant number of stocks. These bursts were sustained throughout the 32 minute sequence.

In the first chart shown below, a single occurrence represents a burst of 500 or more sequential quotes per second on the same stock, from the same reporting exchange:

Quote/Trade Ratio, Quote Counts, % Quotes from symbols with High Quote Counts and Number of Symbols with High Quote Counts:



Publication Date: August 10, 2010

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