Unusual 1-minute bar on QQQ 9-2-11

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643

Maybe a dumb rookie question but I'll ask anyway. On Friday 9-2-11, QQQ traded in a fairly narrow range except for one bar @ 9:39 AM. This bar opened at 53.43, went up to 54.61 and closed at 53.42. Any ideas what would cause this, and would it trigger any open orders above the market? Any thoughts would be much appreciated.
 
Quote from 643:

Maybe a dumb rookie question but I'll ask anyway. On Friday 9-2-11, QQQ traded in a fairly narrow range except for one bar @ 9:39 AM. This bar opened at 53.43, went up to 54.61 and closed at 53.42. Any ideas what would cause this, and would it trigger any open orders above the market? Any thoughts would be much appreciated.
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Bad tick. Happens once in a while and gets corrected on the charts.
 
Quote from 643:

Maybe a dumb rookie question but I'll ask anyway. On Friday 9-2-11, QQQ traded in a fairly narrow range except for one bar @ 9:39 AM. This bar opened at 53.43, went up to 54.61 and closed at 53.42. Any ideas what would cause this, and would it trigger any open orders above the market? Any thoughts would be much appreciated.
More...

Sometimes these "bad" prints are the result of institutional options trades that are paired with the underlying security. Happens ALL day to accommodate the delta neutral options trade.
 
Many thanks for the possible scenarios. At least there is now some rationale for why this occurred.
 
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