Nanex Research

Nanex ~ 01-Aug-2013 ~ Comcast Gains $5 Billion

On August 1, 2013 at 12:18:37, the stock of Comcast Corporation (symbol CMCSK, market cap: $116 Billion) suddenly rocketed 4.6% higher, fueled by approximately 750 trades (200,000 shares) and 5,500 quotes (orders to buy/sell) from 11 exchanges and who knows how many dark pools. It took less than one second to reach a peak of $46, only to come crashing back to earth about 3 seconds later on 1/10th of the volume.

For less than a second, Comcast stock was suddenly worth an extra $5 billion. Hope you were able to enjoy it while it lasted.

1. CMCSK Showing trades color coded by exchange and NBBO shaded dark gray.

2. Zooming in to about 1/2 minute of trading.

3. CMCSK Showing ask prices color coded by exchange and NBBO shaded dark gray.
Over 9 quotes placed and canceled for every trade during this time.

4. CMCSK Zooming in on 5 seconds of time.

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